HomeMy WebLinkAbout#20 Water utility consumer confidence report AGENDA ITEM #20
Public Utility District m
MEETING DATE: April 3, 2024
TO: Board of Directors
FROM: Chad Reed, Water Utility Director
SUBJECT: Considering Review of the District's 2023 Water Utility Annual
Consumer Confidence Reports
APPROVED BY:
Brian C. Wright, General Manager
RECOMMENDATION:
Review the Truckee Donner Public Utility District's Main System and Hirschdale
System's 2023 Water Quality Consumer Confidence Reports and provide feedback to
staff.
BACKGROUND:
The District's mission statement states that "the mission of the Truckee Donner Public
Utility District is to provide reliable, high quality utility and customer services while
managing District resources in a safe, open, responsible, and environmentally sound
manner at the lowest practical cost." Additionally, one of the goals identified in the
District's Strategic Plan is to "engage with our customers and communities in a
welcoming and transparent way to identify opportunities." Of the many services
delivered to our rate payers, the District's annual water quality Consumer Confidence
Reports are a critical component of delivering on our mission.
The 1996 amendment to the US EPA Safe Drinking Water Act (SDWA) requires urban
water systems to deliver an annual water quality report, referred to as the Consumer
Confidence Report (CCR). The CCR summarizes annual water quality information,
including source water, levels of detected contaminants, and compliance with
regulatory agencies.
Each year, the District prepares individual reports for the Truckee Main System and the
Hirschdale System. The State Water Resources Control Board (SWRCB) requires the
District to mail or directly deliver a copy of the appropriate report to each of its
customers no later than July 1 st of each year. However, in 2012, the SWRCB included
a provision that allows the District to provide customers with notice and a "one-click"
web link to the CCR in lieu of mailing a printed copy.
Page 1 of 2
Page 121 of 159
ANALYSIS AND BODY:
The 2023 CCRs have been prepared by the District's Water Department for the
Hirschdale System and the Truckee-Main System (Attachments 1 and 2 respectively).
Each of the reports will be submitted to the SWRCB for compliance.
The Truckee community is fortunate to have access to sustainable, high-quality water
stored in the Martis Valley Aquifer, producing potable water with no reportable
violations over the Maximum Contaminant Level (MCL). All MCLs are established and
monitored by State and Federal regulatory agencies.
Customers will be notified in their May monthly water bills, via a District "bill stuffer" or
e-notification, that the CCR is now available to be viewed via a "one-click" link on the
District's website. On request, printed copies of the CCR will be available for
customers.
GOALS AND OBJECTIVES:
District Code 1 .05.020 Objectives:
1. Responsibly serve the public.
3. Provide reliable and high-quality water supply and distribution system to meet
current and future needs.
District Code 1 .05.030 Goals:
1. Manage for Financial Stability and Resiliency
2. Environmental Stewardship: Create a sustainable resilient environment for all our
communities.
3. Engage with our customers and communities in a welcoming and transparent way to
identify opportunities.
FISCAL IMPACT:
The costs associated with the preparation and distribution of the 2023 Consumer
Confidence Reports are included in the Board approved FY24 Water Operations
Budget.
ATTACHMENTS:
1. Hirschdale 2023 CCR
2. Main 2023 CCR D1.0
Page 2 of 2
Page 122 of 159
' TRUCKEE DONNER
Public Utility District
44 YVAT�B QWAWTY B PORT
Customer Views Are Welcome
The Truckee Donner Public Utility District encourages community partici-
pation in the public process. If you are interested in participating in the
TDPUD's decision-making process, you are welcome to attend Board
Meetings.
The TDPUD Board of Directors meets at 6:00 PM on the first and third
Wednesday of each month in the TDPUD Board room, located at 11570 � aA
Donner Pass Road, Truckee, California. Agendas for upcoming meetings _-
may be obtained on our website or from the Deputy District Clerk's office,
(530)582-3980.
For More Information:
0 About this report or the water treatment process, contact Truckee / � 1J1/l
Donner Public Utility District's Senior Water Quality Technician, Clay For more
Walker at (530)582-3926. information about
us,please visit our
0 About water conservation and efficiency, the TDPUD has water website at
conservation programs that will help customers save water and save www.tdpud.org .
money. Information can be found on our website or by calling (530)
587-3896. 11111144
HIRSCHDALE
WATER SYSTEM �� In This Document
• Water Quality General Information
Source Water Assessment
Where Our Water Comes From
Lead In Drinking Water
Definitions
s i
•� Sampling Results
� s
entienda bien.
Page 123 of 159
Water Quality k ,j
Truckee Donner Public Utility District takes pride in delivering the highest quality of —
water to its customers. The water quality staffs goal is to exceed State and USEPA " r,
water quality standards. Staff takes 12 routine bac-t samples annually along with
Title 22 monitoring samples. All samples are examined by a certified ELAP labora-
tory using a methodology required by State and Federal laws. The data in this re-
port is a snapshot of the quality of water provided to TDPUD customers for the 2022 -'
calendar year. This report includes details about your local water sources, annual
water quality sampling data, and how it compares to State and USEPA standards.
Truckee Donner Public Utility District is committed to providing you with the infor-
mation about your water supply because customers who are well informed are key
to the collaborative process in identifying improvements that are necessary to main-
tain the highest drinking water standards.
It is important to note, that while the TDPUD strives to meet all State and Federal
drinking water standards, some people may be more vulnerable to contaminants in
drinking water than the general population. Immuno-compromised persons such as Source Water
persons with cancer undergoing chemotherapy, people who have undergone organ Assessment
transplants, people with HIV/AIDS or other immune system disorders, some elderly
individuals, and infants can be particularly at risk from infections. These people A source water assessment has
should seek advice about drinking water from their health care providers. USEPA/ been completed for the well serving
Centers for Disease Control (CDC) guidelines on appropriate means to lessen the the Hirschdale area. The well is
risk of infection by Cryptosporidium and other microbiological contaminants are located in the town of Hirschdale.
available from the Safe Drinking Water Hotline at (800)426-4791 or https:// The District owns and operates the
www.epa.gov/ground-water-and-drinking-water/safe-drinking-water-hotline. single well which is 270ft in depth. A
copy of the complete assessment
may be viewed at the Truckee
Lead in Residential Plumbing Donner Public Utility District office,
located at 11570 Donner Pass
If present, elevated levels of lead can cause serious health problems, especially for Road, Truckee, California, or by
pregnant women and young children. In circumstances where lead is detected in calling Chad Reed at (530)582-
drinking water, it is primarily derived from materials and components associated 3984.
with service lines and residential plumbing. The TDPUD is responsible for providing
high quality water, but cannot control the variety of materials used in plumbing com-
ponents. When your water has been sitting for a prolonged period of time, you can
minimize the potential for lead exposure by flushing your tap for 30 seconds to 2
minutes before using water for drinking or cooking.We conduct routine sampling for
lead every three years. The last sampling was performed in 2022, where all sites
tested below the Federal action level for lead. More information about lead in drink-
ing water, testing methods, and steps you can take to minimize exposure can be
found at www.epa.gov/lead.
Where Our Water Comes From
r
The source of drinking water served to our Hirschdale customers comes from a well ;
drawing from a deep aquifer. We filter this water to remove iron, manganese, and
arsenic before delivering it to your home.Because of natural filtration,the groundwa-
ter aquifer is protected from surface water contamination, giving us a high quality of
drinking water.
Cryptosporidium and Giardia
Recognizing that our potable water sources are exclusive) drawn from a deep
r i `iflr7ril�rrri»trrrirref,i
9 9 P Y P
groundwater well, the presence of microscopic organisms such as Cryptosporidium , ...
and Giardia in our water is highly unlikely. If ingested, Cryptosporidium and Giardia
can cause diarrhea,fever, and other gastrointestinal symptoms.
Page 124 of 159
Substances That May Be Found In WaterPr Definitions
Sources of drinking water (both tap and bot- n^ (MCL): The highest
tled water) include rivers, lakes, streams, level of a contaminant that is allowed in drinking water.
ponds, reservoirs, springs, and wells. As Primary MCLs are set as close to the PHGs (or MCLGs)
water travels over the surface of the land or as is economically and technologically feasible.
r
through the ground, it dissolves naturally- Secondary MCLs are set to protect the odor, taste, and
occurring minerals and, in some cases, radi- appearance of drinking water.
oactive material, and can pick up substances
resulting from the presence of animals or t Maximum Contaminant Level Goa (MCLG): The level
from human activity. of a contaminant in drinking water below which there is
x no known or expected risk to health. MCLGs are set by
In order to ensure that tap water is safe to the U.S. Environmental Protection Agency(USEPA).
drink, the U.S. Environmental Protection _
Agency (USEPA) and the State Water F Public Health Goal (PHG): The level of a contaminant
Resources Control Board (State Board) in drinking water below which there is no known or
prescribe regulations that limit the amount of certain contaminants in water expected risk to health. PHGs are set by the California
provided by public water systems. Drinking water, including bottled water, may Environmental Protection Agency.
contain at least small amounts of some contaminants. The presence of many
of these contaminants does not necessarily indicate that water poses a health '13ximum Kesiauai Disinfectant ue� (MRDL): The
risk. highest level of a disinfectant allowed in drinking water.
There is convincing evidence that addition of a
Examples of contaminants that may be present in source water include: disinfectant is necessary for control of microbial
contaminants.
Microbial Contaminants, such as viruses and bacteria, that may come from
stormwater or wastewater, septic systems, agricultural livestock operations, Maxim„r
and wildlife; (MRDLG): The level of a drinking water disinfectant
below which there is no known or expected risk to
Inorganic Contaminants, such as salts and metals, that can be natu- health. MRDLGs do not reflect the benefits of the use of
rally occurring or can result from erosion, urban stormwater runoff, industrial or disinfectants to control microbial contaminants.
domestic wastewater discharges, oil and gas production, mining, or farming;
Primary Drinking Water Standards (PDWS): MCLs
Pesticides and Herbicides, that may come from a variety of sources such as and MRDLs for contaminants that affect health along
agriculture, urban stormwater runoff, and residential uses; with their monitoring and reporting requirements, and
Organic Chemical Contaminants, including synthetic and volatile organic water treatment requirements.
chemicals, which are by-products of industrial processes and petroleum Secondary Drinking Water Standi. (SDWS): MCLs
production, and which can also come from gas stations, urban stormwater for contaminants that affect taste, odor, or appearance
runoff, agricultural applications, and septic systems; of the drinking water. Contaminants with SDWSs do not
affect the health at the MCL levels.
Radioactive Contaminants, that can be naturally occurring or can be the
result of oil and gas production and mining activities. (AL): The concentration of a
contaminant which, if exceeded, triggers treatment or
More information about contaminants and potential health effects can be other requirements that a water system must follow.
obtained by calling the U.S. EPA's Safe Drinking Water Hotline at (800) 426-
4791.
FTable Kev
N/A: not applicable
N/D: not detectable at testing limit
ppm: parts per million or milligrams per liter(mg/L)
ppb: parts per billion or micrograms per liter(pg/L)
ppt: parts per trillion or nanograms per liter(ng/L)
pCi/L: picocuries per liter(a measure of radiation)
(pS/cm): micro Siemens per centimeter
(NTU): nephelometric turbidity unit(measures water cloudiness)
59
The data in the following tables is from the most recent monitoring done in compliance with Federal and California drinking
water regulations. Some data may be more than one year old. Based upon Federal and State requirements,the monitoring
interval for each constituent varies, and can be any one of the following: weekly, monthly, semi-annually, annually, biennially,
or once every three, six, or nine years, or as deemed necessary by regulatory agencies.
TABLE 1—SAMPLING RESULTS SHOWING THE DETECTION OF COLIFORM BACTERIA
Microbiological Contami- Highest No. No.of months in
nants of Detec- violation MCL MCLG Typical Source of Bacteria
tions
More than 5%of samples
Total Coliform Bacteria 0 0 in a month with a detec- 0 Naturally present in the environment
tion
TABLE 2—DISINFECTION BY-PRODUCTS
Contaminant #Samples, Average Range MCL(MRDL) MCLG Typical Source of Contaminant
Frequency Level (MRDLG)
Chlorine Residual(ppm) 1 per month 0.46 .41-.52 4 4 Drinking water disinfectant added for
treatment
Total Trihalomethanes 1 on 17 N/A 80 N/A By-product of drinking water
(ppb) 8/22/23 disinfection
Haloacectic Acids(ppb) 1 on 6.3 N/A 60 N/A By-product of drinking water
8/22/23 disinfection
TABLE 3—DISTRIBUTION SYSTEM CUSTOMER TAP SAMPLING FOR LEAD AND COPPER
90th per-
No.of No.sites
Date Last centile
Lead and Copper Sampled samples level de- exceeding AL PHG Typical Source of Contaminant
collected tected AL
Internal corrosion of household water
Lead(ppb) 8/11/22 5 .02 0 15 0.2 plumbing systems;discharges from
industrial manufacturers;erosion of
natural deposits
Internal corrosion of household
Copper(ppm) 8/11/22 5 0.046 0 1.3 0.3 plumbing systems;erosion of natu-
ral deposits;leaching from wood
preservatives
TABLE 4—SAMPLING RESULTS FOR SODIUM AND HARDNESS
Chemical or Constituent Date Last Level De- PHG
(reporting units) Sampled tected Range of Detections MCL (MCLG) Typical Source of Contaminant
Sodium(ppm) 2022 40 N/A N/A N/A Salt present in the water and is general-
ly naturally occurring
Sum of polyvalent cations present
Hardness(as CaCO3)(ppm) 2022 91 N/A N/A N/A in the water,generally magnesium
and calcium,and are usually natu-
rally occurring
TABLE 5- UNREGULATED COMPOUNDS
Chemical or Constituent Date Last Level Detected Range of Detec- MCL PHG Typical Source of Contaminant
(reporting units) Sampled tions (MCLG)
Alkalinity(as CaCO3)(ppm) 2022 150 N/A N/A N/A Erosion of natural deposits
Bicarbonate Alkalinity(as 2022 180 N/A N/A N/A Leaching of natural deposits
HCO3)(ppm)
Calcium(ppm) 2022 15 N/A N/A N/A Erosion of natural deposits
Magnesium(ppm) 2022 13 N/A N/A N/A Erosion of natural deposits
Potassium(ppm) 2022 7.1 N/A N/A N/A Erosion of natural deposits
Page 126 of 159
TABLE 6—DETECTION OF CONTAMINANTS WITH A PRIMARY DRINKING WATER STANDARD
Chemical or Constituent Date Last Range of Detec- PHG
(reporting units) Sampled Level Detected tiions MCL (MCLG) Typical Source of Contaminant
Inorganic Contaminants
Arsenic(ppb) 2023 .63 N/D-1.8 10 0.004 Erosion of natural deposits
Barium(ppm) 2022 87 N/A 1000 2000 Erosion of natural deposits
Fluoride(ppm) 2022 0.096 N/A 2 1 Erosion of natural deposits
Turbidity(NTU) 2022 3 N/A 5 5 Soil runoff
Radioactive Contaminants
Gross Alpha Particle 2018 N/D 3 15 0 Erosion of natural deposits
Activity(pCi/L)
Radon(pCi/L) 2005 570 N/A N/A* N/A* Erosion of natural deposits
*Note The State of California does not have an MCL for Radon. The EPA has an advisory MCL of 4000 pCi/L
for Radon.
TABLE 7—DETECTION OF CONTAMINANTS WITH A SECONDARY DRINKING WATER STANDARD
Chemical or Constituent Date Last Range of Detec- PHG
(reporting units) Sampled Level Detected tions MCL (MCLG) Typical Source of Contaminant
Chloride(ppm) 2022 7.6 N/A 250 N/A Leaching of natural deposits
Iron(ppb) 2022 9.5 N/A 300 N/A Leaching of natural deposits
Manganese(ppb) 2022 13 N/A 50 N/A Leaching of natural deposits
pH 2O22 7.9 7.7- 8.0 6.5- 8.5 N/A Erosion of natural deposits
Specific)Conductance 2022 350 N/A 1600 N/A Substances that form ions when in
(µS/cm
Sulfate 2022 14 N/A 250 N/A Leaching of natural deposits
Total Dissolved Solids 2022 250 N/A 500 N/A Leaching of natural deposits
(ppm)
Page 127 of 159
FREQUENTLY ASKED QUESTIONS
Q. Why does my water smell and taste like chlorine?
A. Chlorine is regularly injected into the water at the source as a disinfectant that aids in eliminat-
ing potentially harmful bacteria present in water. In high demand summer month's chlorine taste
may be more noticeable because the water is "fresh" or "newer" and has not had time to dissipate
through the system. Chlorine can also gas off in warm/hot water which produces a smell stronger
than normal. Some people are more sensitive than others to the taste and smell of chlorine and may
become aware of occasional changes. This is normal and safe. Chlorine levels are continually moni-
tored.
Q. Why does my water taste like metal?
A.The source water is ground water, which has a mineral content that might give off a metal taste
some are not used too. Sometimes plumbing can cause a metal taste, especially if water has been
sitting in pipes for several hours. It's best to flush the lines for of couple minutes if water has sat in
pipes for an extending period of time, however, this does not indicate a higher or lower degree of wa-
ter quality.
Q. Why is there white crust on my shower head?
A. The minerals in water may leave white spots on glasses, coffeepots, shower heads and shower
doors. These spots are calcium deposits and are not harmful to health.
Q. Why is there a black ring around my toilet?
A. This black ring some may find after returning home when water has sat in the bowl for extend-
ing period of time is mold. Mold will grow in dark, wet, cool places making the toilet bowl a perfect
place for that. If this accrues adding bleach to the bowl and letting it sit works best. To avoid this,
leave a small amount of bleach in the bowl before leaving for more than a couple days.
Q. What clauses cloudy water?
A. Cloudy or milky water is usually caused by trapped air picked up from an air pocket in the water
main or internal plumbing. Sometimes flows or water cascading within the aqueduct can also trap air,
similar to a waterfall. If water sits in a glass or pitcher for a few minutes the air will dissipate and be-
come clear.
Page 128 of 159
40,4rTRUCKEE DONNER
Public Utility District
44 YMT�B QW6LITY B PPRT
Irfruckee Main System PWS# 2
Customer Views Are Welcome
For more information about �
please visit our website
The Truckee Donner Public Utility District encourages community partici- us, at www.tdpud.org .
pation in the public process. If you are interested in participating in the
TDPUD's decision-making process, you are welcome to attend Board 01111 0 0 0 0 0 010WO`
Meetings.
The Board of Directors meets at 6:00 PM on the first and third Wednes IF
-
day of each month in the TDPUD Board room, located at 11570 Donner In This Document
Pass Road, Truckee, California. Agendas for upcoming meetings may be
obtained on our website or from the Deputy District Clerk's office, (530) . Water Quality General
582-3980.
Information
For More Information: . Source Water Assessment
Where Our Water Comes
0 About this report or the water treatment process, contact Truckee From
Donner Public Utility District's Senior Water Quality Technician, Clay
Walker at (530)582-3926. Lead In Home Plumbing
0 About water conservation and efficiency, the TDPUD has water con- • Radon
servation programs that will help customers save water and save
money. Information can be found on our website or by calling (530) • Definitions
587-3896.
low
I a , 1►lY ♦�
i 111,411111111 101 iil I fif 7Tii q'MF11 i flu If, rfraE�l u.ki ti,�Wnf ;�€xrriinm
E�11:111.�1 liil.l! IfiiTt�ifTffl"ifi�tll I]Jtll�llGltal�u u+ii� ut3rrrn ..m r,
V l
•R 'Y
Este informe contiene informacion muy importante sobre su agua potable. Traduzcalo o hable
con alguien que to entienda bien. Page 29 of 159
Water Quality
Truckee Donner Public Utility District takes pride in delivering the highest quality
of water to its customers. The water quality staffs goal is to exceed State and
USEPA water quality standards. Staff takes 520 routine bac-t samples annually AO"I
along with Title 22 monitoring samples.All samples are examined by a certified
ELAP laboratory using a methodology required by State and Federal laws.The
data in this brochure is a snapshot of the quality of water provided to TDPUD
customers for the 2023 calendar year. This report includes details about your local
water resources,water quality monitoring data,and how it compares to State and
USEPA standards.
Truckee Donner Public Utility District is committed to providing you with
information about your water supply because customers who are well informed
are key to the collaborative process in identifying improvements that are neces-
sary to maintain the highest drinking water standards.
It is important to note, that while the TDPUD strives to meet all State and Federal Source Water
drinking water standards, some people may be more vulnerable to contaminants Assessment
in drinking water than the general population. Immuno-compromised persons such
as persons with cancer undergoing chemotherapy, people who have undergone A source water assessment was prepared in
organ transplants, people with HIV/AIDS or other immune system disorders, some 2002 for the wells serving the Truckee area.
elderly individuals, and infants can be particularly at risk from infections. These The wells are located throughout the town of
people should seek advice about drinking water from their health care providers. Truckee and Glenshire.The District owns
USEPA/Centers for Disease Control (CDC)guidelines on appropriate means to and operates 10 wells varying in depth from
lessen the risk of infection by Cryptosporidium and other microbiological contam- 120ft to 500ft. The complete source water
inants are available from the Safe Drinking Water Hotline at(800)426-4791 or assessment and known vulnerabilities may
https://www.epa.gov/ground-water-and-drinking-water/safe-drinking-water-hotline. be viewed at the Truckee Donner Public
Utility District office, located at 11570 Donner
Pass Road, Truckee, California, or by calling
Lead in Residential Plumbing Chad Reed at(530)582-3984.
If present, elevated levels of lead can cause serious health problems, especially
for pregnant women and young children. In circumstances where lead is detected
in drinking water, it is primarily derived from materials and components associated
with service lines and residential plumbing.TDPUD is responsible for providing
high quality water, but cannot control the variety of materials used in plumbing
components within private property. If your water has been sitting for a prolonged
period of time,you can minimize the potential for lead exposure by flushing your What i s Ground Water?
tap for 30 seconds to 2 minutes before using water for drinking or cooking.We
conduct routine sampling for lead every three years.The last sampling was per-
formed in 2022,where all sites tested below the Federal action level for lead.The
next round of lead sampling is scheduled for the summer of 2025. More infor-
mation about lead in drinking water,testing methods, and steps you can take to ,
minimize exposure can be found at www.epa.gov/lead.
Where Our Water Comes From
Drinking water served to Truckee Donner Public Utility District customers in the
Truckee system is groundwater that comes from 10 deep wells. Because of natu-
ral filtration,the groundwater aquifer is protected from surface water contamina-
tion, giving us a high quality of drinking water.
Sand and gravel
Cryptosporidium and Giardia
Recognizing that our potable water sources are exclusively deep groundwater
wells,the presence of microscopic organisms such as Cryptosporidium and Giar- clay
dia in our water is highly unlikely. If ingested, Cryptosporidium and Giardia can
cause diarrhea,fever, and other gastrointestinal symptoms.
Arsenic
In 2001 the United States Environmental Protection
Agency (USEPA) adopted new standards for arsenic in
drinking water. They lowered the maximum contaminant
level from 50 parts per billion (ppb), down to 10 ppb.
Since most people are not familiar with ppb, One part
per billion would be equivalent to 1 second in 32 years LI '
so this an extremely small number. With this being con-
sidered, the drinking water from Truckee Donner Public f
Utility District meets the current Federal and State
standards for arsenic. The USEPA continues to re-
search the health effects of low levels of arsenic, which
is a mineral known to cause cancer in humans with pro-
longed exposures at elevated concentrations and has poten-
tial links to other health effects such as skin damage and cir-
culatory problems.
Water Source Blending: The TDPUD operates the Glen-
shire Drive Well, Prosser Village Well and Old Greenwood Water Hardness
Well under a SWRCB approved blending permit. The blend- Occasionally, a water user will need to adjust an
ing permit ensures lower detectable concentrations of arsenic
in drinking water prior to being conveyed into the distribution appliance, such as a dishwasher or water sof-
system. The arsenic monitoring sample results from the tener, to a particular setting based upon the
blending point ranged from a low of 1.6 ppb to a high of hardness of the water served to their home or
7.7 ppb with an average of 4.6 ppb. The MCL for arsenic is business.
10 ppb.
Radon Please use the information provided below to
help with water hardness questions.
Radon is a radioactive gas that you cannot see, taste, or
smell. It is found throughout the United States. Radon can
move up through the ground and into a home through
cracks and holes in structural foundations. Radon can ac-
cumulate in all types of homes. Radon can also get into in-
door air when released from tap water from showering, Water Softener /Appliance Setting
washing dishes, and other household activities. Compared
to radon entering the home through ground sources, radon In 2022 testing, TDPUD had an average hard-
exposure through water sources are typically far less com- ness result of 71.0 mg/L. That translates to an
mon and much smaller in magnitude. Radon is a known hu- average of 4.1 grains per gallon. One grain per
man carcinogen. Exposure to air containing radon has been gallon equals 17.1 mg/L.
known to lead to lung cancer. Drinking water containing ra-
don may also cause increased risk of stomach cancer. If you
are concerned about radon levels in your home, testing is Degree of Hardness Grains per Gallon ppm (or mg/
recommended. Testing can be relatively inexpensive and (gpg) L)
easy. Radon mitigation and removal for your home is rec-
ommended for detectable concentrations in excess of 4 pico-
curies per liter of air (pCi/L). There are often simple ways Soft < 1.0 < 17.0
to fix a radon problem that are not too costly. For additional
information, call your State radon program (1-800-745- Slightly Hard 1.0- 3.5 17.1- 60
7236), the USEPA Safe Drinking Water Hotline (1-800-426- Moderately Hard 3.5 - 7.0 60- 120
4791), or the National Safety Council Radon Hotline (1-
800-SOS-RADON). Hard 7.0- 10.5 120- 180
Very Hard > 10.5 > 180
age 13 1 o
Substances That Could Be In Water Definitions
The sources of drinking water (both tap and Maximum Contaminant Level (MCL): The highest
bottled water) include rivers, lakes, streams, level of a contaminant that is allowed in drinking wa-
ponds, reservoirs, springs, and wells. As wa- ter. Primary MCLs are set as close to the PHGs (or
ter travels over the surface of the land or MCLGs) as is economically and technologically fea-
through the ground, it dissolves naturally- sible. Secondary MCLs are set to protect the odor,
occurring minerals and, in some cases, radio- taste, and appearance of drinking water.
active material, and can pick up substances L
resulting from the presence of animals or Maximum Contaminant Level Goal (MCLG): The
from human activity. level of a contaminant in drinking water below which
there is no known or expected risk to health. MCLGs
In order to ensure that tap water is safe to w are set by the U.S. Environmental Protection Agency
drink, the U.S. Environmental Protection (USEPA).
Agency (USEPA) and the State Water
Resources Control Board (State Board) Public Health Goal (PHG): The level of a contami-
prescribe regulations that limit the amount of certain contaminants in water nant in drinking water below which there is no known
provided by public water systems. State Board regulations also establish limits or expected risk to health. PHGs are set by the Cali-
for contaminants in bottled water that provide the same protection for public fornia Environmental Protection Agency.
health. Drinking water, including bottled water, may reasonably be expected to
contain at least small amounts of some contaminants. The presence of Maximum Residual Disinfectant Level (MRDL):
contaminants does not necessarily indicate that water poses a health risk. The highest level of a disinfectant allowed in drinking
water. There is convincing evidence that addition of
Contaminants that may be present in source water include: a disinfectant is necessary for control of microbial
contaminants.
Microbial Contaminants, such as viruses and bacteria, that may come from
sewage treatment plants, septic systems, agricultural livestock operations, and Maximum Residual Disinfectant Level Goal
wildlife; (MRDLG): The level of a drinking water disinfectant
below which there is no known or expected risk to
Inorganic Contaminants, such as salts and metals, that can be natu- health. MRDLGs do not reflect the benefits of the
rally occurring or can result from urban stormwater runoff, industrial or domes- use of disinfectants to control microbial contami-
tic wastewater discharges, oil and gas production, mining, or farming; nants.
Pesticides and Herbicides, that may come from a variety of sources such as Primary Drinking Water Standards (PDWS): MCLs
agriculture, urban stormwater runoff, and residential uses; and MRDLs for contaminants that affect health along
Organic Chemical Contaminants, including synthetic and volatile organic with their monitoring and reporting requirements, and
water treatment requirements.
chemicals, which are by-products of industrial processes and petroleum
production, and which can also come from gas stations, urban stormwater Secondary Drinking Water Standards (SDWS):
runoff, agricultural applications, and septic systems; MCLs for contaminants that affect taste, odor, or
appearance of the drinking water. Contaminants with
Radioactive Contaminants, that can be naturally occurring or can be the re- SDWSs do not affect the health at the MCL levels.
sult of oil and gas production and mining activities.
Regulatory Action Level (AL):The concentration of
More information about contaminants and potential health effects can be a contaminant which, if exceeded, triggers treatment
obtained by calling the USEPA's Safe Drinking Water Hotline at (800) 426-4791. or other requirements that a water system must fol-
low.
Table Kev
N/A: not applicable
N/D: not detectable at testing limit
ppm: parts per million or milligrams per liter(mg/L)
ppb: parts per billion or micrograms per liter(pg/1)
ppt: parts per trillion or nanograms per liter(ng/L)
pCi/L: picocuries per liter(a measure of radiation)
(pS/cm): micro Siemens per centimeter
Page 132 of 159
The data in the following tables is from the most recent monitoring done in compliance with Federal and California drink-
ing water regulations. Some data may be more than one year old. Based upon Federal and State requirements, the moni-
toring interval for each constituent varies, and can be any one of the following: weekly, monthly, semi-annually, annual-
ly, biennially, or once every three, six, or nine years, or as deemed necessary by regulatory agencies.
SAMPLING1 DETECTION OF COLIFORMBACTERIA
No.
Microbiological Contam- HighestNo. of months in viola-
inants of Detec- tion MCL MCLG Typical Source of Bacteria
tions
More than 5%of Naturally present in the envi-
Total Coliform Bacteria 0 0 samples in a month 0 ronment
with a detection
TABLEDISINFECTION " 11
#Samples, Average MCLG Typical Source of Contami-
Contaminant Frequency Level Range MCL(MDRL) (MDRLG) nant
40-50 per Drinking water disinfectant
Chlorine Residual(ppm) month 0.37 .35-.41 4 4 added for treatment
By-product of drinking water
Haloacetic Acids(ppb) 2 on 8/22/23 1.35 0-2.7 60 N/A disinfection
Total Trihalomethanes By-product of drinking water
(ppb) 2 on 8/22/23 6.8 9-4.6 80 N/A disinfection
TABLE 3 -DISTRIBUTION CUSTOMER TAP SAMPLING FOR LEAD AND COPPER
No. of sam- 90th No. sites
Date Last percentile Typical Source of Contami-
Lead and Copper Sampled Ples collect- level de- exceeding AL PHG nant
ed tected AL
Internal corrosion of household
Lead(ppb) August 32 7.0 0 15 0.2 plumbing systems; discharges
2022 from industrial manufac-
tures,erosion of natural deposits
Internal corrosion of household
Copper(ppm) August 32 0.180 0 1.3 0.3 plumbing systems; erosion of
2022 natural deposits; leaching from
wood preservatives
Page 133 of 159
TABLE I ♦ 1 SAMPLING FOR SCHOOL DISTRICT
No. of
Schools Re- No. sites
Contaminant Dated questing Range exceeding AL PHG Typical Source of Contami-
pleLead Sam- AL nant
pling
Internal corrosion of household
Lead(ppb) Dec-18 8 <0.2 0 15.0 0.2 plumbing systems; erosion of
natural deposits; leaching from
wood preservatives
TABLEUNREGULATED
Chemical or Constituent Date Last Average Level Range of Detec- PHG Typical Source of Contami-
(reporting units) Sampled Detected tions MCL (MCLG) nant
Alkalinity(as CaCO3) 2022 77 69-88 N/A N/A Naturally present in water
(ppm)
Bicarbonate Alkalinity(as 2022 77 69-88 N/A N/A Naturally present in water
HCO3) (ppm)
Calcium(ppm) 2022 15 11-33 N/A N/A Natually occuring
Leaching of natural depo
Potassium(ppm) 2022 3.3 2.1-8.3 N/A N/A
TABLE 6 -DETECTION OF CONTAMINANTS PRIMARY DRINKING WATER STAN
Chemical or Constituent Date Last Average Level Range of Detec- MCL PHG Typical Source of Contami-
(reporting units) Sampled Detected tions (MCLG) nant
Arsenic (ppb) 2022 4.70 N/D - 10 10 0.004 Erosion of natural deposits
Barium(ppb) 2022 17.70 7.1-29 1000 2000 Erosion of natural deposits
Chromium, Total(ppb) 2022 0.50 N/D - 1.4 100 100 Erosion of natural deposits
Chromium,Hexavalent 2023 .8 .29-1.4 0 0 Erosion of natural deposits
(ppb)
*Note The State of California does not have an MCL for Hexavalent Chromium (ppb).The previous MCL of
0.0010 mg/I was withdrawn On September 11, 2017
Fluoride(ppm) 2022 0.01 N/D-0.63 2 1 Erosion of natural deposits
Runoff and leaching from ferti-
Nitrate as N(ppm) 2023 0.30 N/D-0.50 10 10 lizer use; leaching from septic
tanks and sewage; erosion of
natural deposits
Turbidity(NTU) 2022 0.20 N/D-0.45 5 5 Soil runoff
Gross Alpha Particle 2007-2018 0.7 N/D-4.6 15 0 Erosion of natural deposits
Activity(pCi/L)
Radon(pCi/L) 2004 90.8 N/D-560 N/A* N/A* Erosion of natural 44deposits
*Note The State of California does not have an MCL for Radon.The EPA has an advisory-MCL lf3400 159
PagpCi/L for Radon.
SECONDARYTABLE 7 -DETECTION OF CONTAMINANTS DRINKING WATER STAND-
A"
Chemical or Constituent Date Last Level Detected Range of Detec- MCL PHG Typical Source of Contami-
(reporting units) Sampled tions (MCLG) nant
Chloride(ppm) 2022 11.7 1-62 250 N/A Leaching of natural deposits
Odor-Threshold(TON) 2022 0.4 N/D- 1 3 N/A Naturally-occurring organic
materials
pH 2O22 8.1 8-8.2 6.5 - 8.5 6.5 - 8.5 Leaching of natural deposits
Specific Conductance 2019 182 110- 380 1600 N/A Substances that form ions when
(µS/cm) in water.
Total Dissolved Solids 2019 122 110-230 500 N/A Leaching of natural deposits
(ppm)
Page 135 of 159
FREQUENTLY ASKED QUESTIONS
Q. Why does my water smell and taste like chlorine?
A. Chlorine is regularly injected into the water at the source as a disinfectant that aids in eliminat-
ing potentially harmful bacteria present in water. In high demand summer month's chlorine taste
may be more noticeable because the water is "fresh" or "newer" and has not had time to dissipate
through the system. Chlorine can also gas off in warm/hot water which produces a smell stronger
than normal. Some people are more sensitive than others to the taste and smell of chlorine and may
become aware of occasional changes. This is normal and safe. Chlorine levels are continually moni-
tored.
Q. Why does my water taste like metal?
A. The source water is ground water, which has a mineral content that might give off a metal taste
some are not used too. Sometimes plumbing can cause a metal taste, especially if water has been
sitting in pipes for several hours. It's best to flush the lines for of couple minutes if water has sat in
pipes for an extending period of time, however, this does not indicate a higher or lower degree of
water quality.
Q. Why is there white crust on my shower head?
A. The minerals in water may leave white spots on glasses, coffeepots, shower heads and shower
doors. These spots are calcium deposits and are not harmful to health.
Q. Why is there a black ring around my toilet?
A. This black ring some may find after returning home when water has sat in the bowl for extend-
ing period of time is mold. Mold will grow in dark, wet, cool places making the toilet bowl a perfect
place for that. If this accrues adding bleach to the bowl and letting it sit works best. To avoid this,
leave a small amount of bleach in the bowl before leaving for more than a couple days.
Q. What clauses cloudy water?
A. Cloudy or milky water is usually caused by trapped air picked up from an air pocket in the water
main or internal plumbing. Sometimes flows or water cascading within the aqueduct can also trap air,
similar to a waterfall. If water sits in a glass or pitcher for a few minutes the air will dissipate and be-
come clear.
age of 159