HomeMy WebLinkAbout14 Water Quality Consumer Confidence ReportAgenda Item # I
TRUCKEE DONNER
Public Utility District
ACTION
To: Board of Directors
From: Brian Wright
Date: May 01, 2019
Subject: Consideration to Approve the Truckee Donner Public Utility
District's 2018 Water Quality Consumer Confidence Report
1. WHY THIS MATTER IS BEFORE THE BOARD
The Water Department staff has prepared the Truckee -Main System and Hirschdale
System 2018 Water Quality Consumer Confidence Reports for publication. Prior to
distribution to our customers, the Board must review and approve the report.
2. HISTORY
The 1996 amendment to the US EPA Safe Drinking Water Act (SDWA) requires
public water systems to deliver to their customers 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
that the District mail or direct deliver a copy of the appropriate report to each of it's
customers no later than July 1st of each year. In 2012, the SWRCB included a
provision that allows the District to provide customers with notice and a "one -click"
weblink access to the CCR in lieu of mailing a printed copy.
3. NEW INFORMATION
The 2018 CCRs have been prepared by the District's Water Department for the
Truckee -Main System and Hirschdale System. Each of the reports have been
submitted to the SWRCB for compliance.
There were no reportable violations over the Maximum Contaminant Level (MCL) set
by State and Federal regulatory agencies.
Customers will be notified in their June 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. Printed copies of the CCR will be made available for customers
upon request. The Truckee Main System and Hirschdale System reports are included
as Attachments 1 and 2 respectively.
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4. FISCAL IMPACT
The costs associated with the preparation and distribution of the 2018 Consumer
Confidence Reports are included in the Board approved FY19 Water Operations
Budget.
5. RECOMMENDATION
Approve the Truckee Donner Public Utility District, Truckee -Main System and
Hirschdale System 2018 Water Quality Consumer Confidence Reports for public
distribution.
Michael D. Holley
General Manager / Water Utility Director
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Truckee Donner Public Utility District
2018 WATER QUALITY REPORT
Customer Views Are Welcome
f you are interested in participating in the decision -making process of
the Truckee Donner Public Utility District, you are welcome to attend
Board Meetings.
The 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 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 District's water quality monitoring program,
contact Truckee Donner Public Utility District's Senior Water Quality
Technician, Clay Walker at (530)582-3926.
0 About water conservation and efficiency, the TDPUD has water
conservation programs that will help customers save water and save
money. Information can be found on our website or by calling (530)
587-3896.
For more information
about us, please visit our
website at
www.tdpud.org.
j
TRUCKEE DONNER PUBLIC UTILITY DISTRICT
Photo by Tim Erskine I ®Erskine Creative Photography
Water Quality
Truckee Donner Public Utility District is able to report that it has met all State
and Federal drinking water standards. The data in this brochure is a
snapshot of the quality of water provided to TDPUD customers for the 2017
calendar year. Included in this document are details about where your water
comes from, what it contains, 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 the District's best allies in supporting improvements that are necessary to
maintain the highest drinking water standards.
Some people may be more vulnerable to contaminants in drinking water than the
general population. Immuno-compromised persons such as persons with cancer
undergoing chemotherapy, people who have undergone organ transplants, people
with HIV/AIDS or other immune system disorders, some elderly individuals, and
infants can be particularly at risk from infections. These people should seek advice
about drinking water from their health care providers. USEPA/Centers for
Disease Control (CDC) guidelines on appropriate means to lessen the risk of
infection by Cryptosporidium and other microbiological contaminants are available
from the Safe Drinking Water Hotline at (800)426-4791 or hftps://www.epa.gov/
ground-water-and-drinking-water/safe-drinking-water-hotline.
Lead in Home Plumbing
�f present, elevated levels of lead can cause serious health problems, especially
for pregnant women and young children. Lead in drinking water is primarily
derived from materials and components associated with service lines and home
plumbing. TDPUD is responsible for providing high quality water, but cannot
control the variety of materials used in plumbing components. When your water
has been sifting for several hours, 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 2016, where all sites tested below the Federal action level for lead.
More information 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
rinking water served to Truckee Donner Public Utility District customers in
the Truckee system is groundwater that comes from 12 deep wells.
Each week, the system is sampled for microbial quality. Because of natural
filtration, the groundwater aquifer is protected from surface water contamination,
giving us a high quality of drinking water.
Cryptosporidium and Giardia
mce we source from deep wells, it is almost impossible to have microscopic
organisms such as Cryptosporidium and Giardia in our water. If ingested,
Cryptosporidium and Giardia can cause diarrhea, fever, and other gastrointestinal
symptoms.
Source Water
Assessment
Asource water assessment was
prepared in 2002 for the wells
serving the Truckee area. The wells
are considered most vulnerable to
the following activities not associated
with any detected contaminants:
septic systems, drinking water
treatment plants, and transportation
corridors. A copy of the complete
assessment may be viewed at the
Truckee Donner Public Utility District
office, located at 11570 Donner Pass
Road, Truckee, California, or by
calling Brian Wright at
(530)582-3957.
Arsenic
While your drinking water meets the current
Federal and State standards for arsenic, it
does contain low levels of arsenic. The standard
balances the current understanding of
arsenic's possible health effects against the costs of
removing arsenic from drinking water. The USEPA
continues to research the health effects of low
levels of arsenic, which is a mineral known to
cause cancer in humans at high concentrations and
is linked to other health effects such as skin
damage and circulatory problems.
Glenshire Drive Well: The Glenshire Drive Well
water is blended with the Prosser Village Well and
the Old Greenwood Well prior to any connection to
the consumer. The well was in use from May
through September in 2017. The arsenic test
results at the blending point ranged from a low of
4.7 ppb to a high of 7.5 ppb with an average of
5.9 ppb. The MCL for arsenic is 10 ppb.
Tadon 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 the foundation. Radon can build up to
high levels in all types of homes. Radon can also
get into indoor air when released from tap water
from showering, washing dishes, and other
household activities. Compared to radon entering
the home through soil, radon entering the home
through tap water will in most cases be a small
source of radon in indoor air. Radon is a known
human carcinogen. Breathing air containing radon
can lead to lung cancer. Drinking water containing
radon may also cause increased risk of stomach
cancer. If you are concerned about radon in your
home, test the air in your home. Testing is
inexpensive and easy. You should pursue radon
removal for your home if the level of radon in your
air is 4 picocuries per liter of air (pCi/L) or higher.
There are simple ways to fix a radon problem that
are not too costly. For additional information, call
your State radon program (1-800-745-7236), the
USEPA Safe Drinking Water Hotline (1-800-426-
4791), or the National Safety Council Radon
Hotline (1-800-SOS-RADON).
Water Hardness
0 ccasionally, a water user will
need to adjust an appliance,
such as a dishwasher or water
softener, to a particular setting
based upon the hardness of the
water served to their home or
business.
Please use the information provided
below to help with water hardness
questions.
In 2016 testing, TDPUD had an average hardness
result of 64.6 mg/L. That translates to an average
of 3.8 grains per gallon. One grain per gallon
equals 17.1 mg/L.
Degree of Hardness Grains per Gallon (gpg) ppm(orrng/L),
Soft <1.0 <17.0
Moderately Hard 3.5 - 7.0 60 -120
Very Hard > 10.5 > 180
Substances That Could Be In Water
he sources of drinking water (both tap
and bottled water) include rivers, lakes,
streams, ponds, reservoirs, springs, and
wells. As water travels over the surface of the
land or through the ground, it dissolves
naturally -occurring minerals and, in some
cases, radioactive material, and can pick up
substances resulting from the presence of
animals or from human activity.
In order to ensure that tap water is safe to
drink, the U.S. Environmental Protection
Agency (USEPA) and the State Water
Resources Control Board (State Board)
prescribe regulations that limit the amount of certain contaminants in water
Definitions
Maximum Contaminant Level (MCL): The highest
level of a contaminant that is allowed in drinking water.
µPrimary MCLs are set as close to the PHGs (or MCLGs)
as is economically and technologically feasible.
Secondary MCLs are set to protect the odor, taste, and
9l9appearance of drinking water.
6
Maximum Contaminant Level Goal (MCLG): The level
of a contaminant in drinking water below which there is
no known or expected risk to health. MCLGs are set by
the U.S. Environmental Protection Agency (USEPA).
Public Health Goal (PHG): The level of a contaminant
in drinking water below which there is no known or
expected risk to health. PHGs are set by the California
provided by public water systems. State Board regulations also establish limits i Environmental Protection Agency.
for contaminants in bottled water that provide the same protection for public
health. Drinking water, including bottled water, may reasonably be expected to j Maximum Residual Disinfectant Level (MRDL): The
contain at least small amounts of some contaminants. The presence of highest level of a disinfectant allowed in drinking water.
contaminants does not necessarily indicate that water poses a health risk. There is convincing evidence that addition of a
Contaminants that may be present in source water include:
Microbial Contaminants, such as viruses and bacteria, that may come
from sewage treatment plants, septic systems, agricultural livestock operations,
and wildlife;
Inorganic Contaminants, such as salts and metals, that can be
naturally occurring or can result from urban stormwater runoff, industrial or
domestic wastewater discharges, oil and gas production, mining, or farming;
Pesticides and Herbicides, that may come from a variety of sources such
as agriculture, urban stormwater runoff, and residential uses;
Organic Chemical Contaminants, including synthetic and volatile organic
chemicals, which are by-products of industrial processes and petroleum
production, and which can also come from gas stations, urban stormwater
runoff, agricultural applications, and septic systems;
Radioactive Contaminants, that can be naturally occurring or can be the
result of oil and gas production and mining activities.
More information about contaminants and potential health effects can be
obtained by calling the USEPA's Safe Drinking Water Hotline at (800) 426-
4791.
Table Key
N/A: not applicable
N/D: not detectable at testing limit
parts per million or milligrams per liter (mg/L)
ppb: parts per billion or micrograms per liter (Ng/1)
ppt: parts per trillion or nanograms per liter (ng/L)
I'U/L: picocuries per liter (a measure of radiation)
7cm): micro Siemens per centimeter
): nephelometric turbidity unit (measures wat
disinfectant is necessary for control of microbial
contaminants.
Maximum Residual Disinfectant Level Goal (MRDLG):
The level of a drinking water disinfectant below which
there is no known or expected risk to health. MRDLGs do
not reflect the benefits of the use of disinfectants to
control microbial contaminants.
Primary Drinking Water Standards (PDWS): MCLs
and MRDLs for contaminants that affect health along with
their monitoring and reporting requirements, and water
treatment requirements.
Secondary Drinking Water Standards (SDWS): MCLs
for contaminants that affect taste, odor, or appearance of
the drinking water. Contaminants with SDWSs do not
affect the health at the MCL levels.
Regulatory Action Level (AL): The concentration of a
contaminant which, if exceeded, triggers treatment or
other requirements that a water system must follow.
TRUCKEE DONNER
„� ♦Of LIC UMITY DISTRACT
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 Contaminants
highest No.
No. of months in violation
MCL
MCLG
Typical Source of Bacteria
of Detections
More than 5% of samples ina
Total Coliform Bacteria
0
0
0
Naturally present in the environment
month with a detection
TABLE 2 — DISINFECTION BYPRODUCTS
Contaminant
# Samples,
Average
Range
MCL (MDRL)
MCLG
Typical Source of Contaminant
Frequency
Level
(AIDRLG)
Chlorine Residual (ppm)
40-50 per
0.38
0.20 - 0.56
4
4
Drinking water disinfectant added for
month
treatment
Total Trihalomethanes (ppb)
2 on 9/11/18
3.8
3.4 - 4.3
80
N/A
By-product of drinking water disinfection
TABLE 3 — DISTRIBUTION SYSTEM CUSTOMER TAP SAMPLING FOR LEAD AND COPPER
Lead and Copper
Date Last
Sampled
No. of
samples
collected
90th
percentile level
detected
No. sites
exceeding AL
AL
PHG
Typical Source of Contaminant
Lead (ppb)
August
30
3.0
0
15
0.2
Typical Source of Contaminant
2016
Internal corrosion of household
Copper (ppm)
August
30
0.083
0
1.3
0.3
plumbing systems; erosion of natural
2016
deposits; leaching from
wood preservatives
TABLE 4- LEAD SAMPLING FOR SCHOOL DISTRICT
No. of
Schools
No. sites
Contaminate
Date sampled
Requesting
Range
AL
PHG
Typical Source of Contaminant
exceeding AL
Lead
Sampling
Internal corrosion of household
Lead (ppb)
Decmeber
8
< 0.2
0
15.0
0.2
plumbing systems; erosion of natural
2018
deposits; leaching from
wood preservatives
TABLE 5 — DETECTION OF CONTAMINANTS WITH A SECONDARY DRINKING WATER STANDARD
Chemical or Constituent
Date Last
Level Detected
Range of Detections
MCL
PHG
Typical Source of Contaminant
(reporting units)
Sampled
(MCLG)
Chloride (ppm)
2016
9.8
N/D - 60
250
N/A
Leaching of natural deposits
Odor -Threshold (TON)
2016
0.8
N/D - 2
3
N/A
Naturally -occurring organic
materials
pH
2O16
8.1
7.8 -8.4
6.5 - 8.5
6.5 - 8.5
Leaching of natural deposits
Specific Conductance
2016
191
110 - 380
1600
N/A
Substances that form ions when in
(PS/cm)
water.
Total Dissolved Solids
2016
133
110 - 230
500
N/A
Leaching of natural deposits
( m
TABLE 6- UNREGULATED COMPOUNDS
Chemical or Constituent
Date Last
Average Level
Range of Detections
MCL
PHG
Typical Source of Contaminant
(reporting units)
Sampled
Detected
(MCLG)
Alkalinity (as CaCO3) (ppm)
2016
69
54 - 90
N/A
N/A
Naturally present in water
Bicarbonate Alkalinity (as HCO3)
2016
92
66 - 110
N/A
N/A
Naturally present in water
(ppm)
•
t
Calcium (ppm)
2016
14
10 - 30
N/A
N/A
Natually occuring
Magnesium (ppm)
2016
7.5
3-10
N/A
N/A
Leaching of natural deposits
Potassium (ppm)
2016
3.4
2 - 8.5
N/A
N/A
Leaching of natural deposits
TABLE 7 — DETECTION OF CONTAMINANTS WITH A PRIMARY DRINKING WATER STANDARD
Chemical or Constituent
Date Last
Average Level
Range of Detections
MCL
PHG
Typical Source of Contaminant
units
(reporting )
Sampled
P
Detected
(MCLG)
Arsenic (ppb)
2017
4.30
N/D - 10
10
0.004
Erosion of natural deposits
Barium (ppb)
2016
13.90
5.80 - 31
1000
2000
Erosion of natural deposits
Chromium, Total (ppb)
2016
0.30
N/D - 1.30
100
100
Erosion of natural deposits
Chromium, Hexavalent (ppb)
2017
0.70
0.10 - 1.20
0
0
Erosion of natural deposits
*Note
The State of California does not have an MCL for Hexavalent Chromium (ppb). The previuos MCL of 0.0010 mg/1
was withdrawn On September 11, 2017
Fluoride (ppm)
2016
0.02
N/D - 0.06
2
1
Erosion of natural deposits
Runoff and leaching from fertilizer use;
Nitrate as N (ppm)
2017
0.30
N/D - 0.70
10
10
leaching from septic tanks and sewage;
erosion of natural deposits
Turbidity (NTU)
2016
0.10
N/D - 0.56
5
5
Soil runoff
Gross Alpha Particle
2007-2018
0.7
N/D - 4.6
15
0
Erosion of natural deposits
Activity (pCi/L)
*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 8 — DETECTION OF CONTAMINANTS WITH A SECONDARY DRINKING WATER STANDARD
Chemical or Constituent
Date Last
Level Detected
Range of Detections
MCLTypical
PHG
Source of Contaminant
(reporting units)
Sampled
(MCLG)
Chloride (ppm)
2016
9.8
N/D - 60
250
N/A
Leaching of natural deposits
Odor -Threshold (TON)
2016
0.8
N/D - 2
3
N/A
Naturally -occurring organic
materials
pH
2O16
8.1
7.8 -8.4
6.5 - 8.5
6.5 - 8.5
Leaching of natural deposits
Spe(RScific Conductance
2016
191
110 - 380
1600
N/A
Subsstances that form ions when in
m
water.
Sulfate (ppm)
2016
3.7
N/D -18
250
N/A
Leaching of natural deposits
Total Dissolved Solids
2016
133
110 - 230
500
N/A
Leaching of natural deposits
( m)
Truckee Donner Public Utility District
2018 WATER QUALITY REPORT
Hirschdale Water System PWS# 2910010
Customer Views Are Welcome
f you are interested in participating in the decision -making process of
the Truckee Donner Public Utility District, you are welcome to attend
Board Meetings.
The 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 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
Donner Public Utility District's Senior Water Quality Technician, Julie
Nelson at (530)582-3926.
0 About water conservation and efficiency, the TDPUD has water
conservation programs that will help customers save water and save
money. Information can be found on our website or by calling (530)
587-3896.
;
For more
information about
us, please visit our
website at
www.tdpud.org.
Water Quality
TJj
ruckee Donner Public Utility District is able to report that it has met all State
and Federal drinking water standards. The data in this brochure is a
snapshot of the quality of water provided to TDPUD customers for the 2017
calendar year. Included in this document are details about where your water
comes from, what it contains, and how it compares to State and USEPA
standards.
Truckee Donner Public Utility District is committed to providing you with the
information about your water supply because customers who are well informed
are the District's best allies in supporting improvements that are necessary to
maintain the highest drinking water standards.
Some people may be more vulnerable to contaminants in drinking water than the
general population. Immuno-compromised persons such as persons with cancer
undergoing chemotherapy, people who have undergone organ transplants, people
with HIV/AIDS or other immune system disorders, some elderly individuals, and
infants can be particularly at risk from infections. These people should seek advice
about drinking water from their health care providers. USEPA/Centers for Disease
Control (CDC) guidelines on appropriate means to lessen the risk of infection by
Cryptosporidium and other microbiological contaminants are available from the
Safe Drinking Water Hotline at (800)426-4791 or https://w m.epa.gov/ground-
water-and-drinking-water/safe-drinking-water-hotline.
Lead in Home Plumbing
f present, elevated levels of lead can cause serious health problems, especially
for pregnant women and young children. Lead in drinking water is primarily
derived from materials and components associated with service lines and home
plumbing. TDPUD is responsible for providing high quality water, but cannot
control the variety of materials used in plumbing components. When your water
has been sifting for several hours, 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 2016, where all sites tested below the Federal action level for lead.
More information 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
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.
Additionally, each month the system is sampled for microbial quality. Because of
natural filtration, the groundwater aquifer is protected from surface water
contamination, giving us a high quality of drinking water.
Cryptosporidium and Giardia
mce we source from a deep well, it is almost impossible to have microscopic
organisms such as Cryptosporidium and Giardia in our water. If ingested,
Cryptosporidium and Giardia can cause diarrhea, fever, and other gastrointestinal
symptoms.
Source Water
Assessment
Asource water assessment has
been completed for the well
serving the Hirschdale area. The well
is considered most vulnerable to the
following activities not associated
with any detected contaminants:
septic systems, drinking water
treatment plants, and transportation
corridors. A copy of the complete
assessment may be viewed at the
Truckee Donner Public Utility District
office, located at 11570 Donner Pass
Road, Truckee, California, or by
calling Brian Wright at
(530)582-3957.
V\ " T .
Substances That Could Be In Water
he sources of drinking water (both tap and bottled water) include
rivers, lakes, streams, ponds, reservoirs, springs, and wells. As
water travels over the surface of the land or through the ground, it
dissolves naturally -occurring minerals and, in some cases, radioactive
material, and can pick up substances resulting from the presence of
animals or from human activity.
Definitions
Maximum Contaminant Level (MCL): The
highest level of a contaminant that is allowed
in drinking water. Primary MCLs are set as
close to the PHGs (or MCLGs) as is
economically and technologically feasible.
Secondary MCLs are set to protect the odor,
taste, and appearance of drinking water.
In order to ensure that tap water is safe to drink, the U.S. Environmental
Protection Agency (U.S. EPA) and the State Water Resources Control
Maximum Contaminant Level Goal (MCLG):
Board (State Board) prescribe regulations that limit the amount of certain
The level of a contaminant in drinking water
contaminants in water provided by public water systems. State Board
below which there is no known or expected
regulations also establish limits for contaminants in bottled water that
risk to health. MCLGs are set by the U.S.
provide the same protection for public health. Drinking water, including
Environmental Protection Agency (USEPA).
bottled water, may reasonably be expected to contain at least small
amounts of some contaminants. The presence of contaminants does not
Public Health Goal (PHG): The level of a
necessarily indicate that water poses a health risk,
contaminant in drinking water below which
Contaminants that may be present in source water include
Microbial Contaminants, such as viruses and bacteria, that may
come from sewage treatment plants, septic systems, agricultural livestock
operations, and wildlife;
Inorganic Contaminants, such as salts and metals, that can be
naturally occurring or can result from urban stormwater runoff, industrial
or domestic wastewater discharges, oil and gas production, mining, or
farming;
there is no known or expected risk to health.
PHGs are set by the California Environmental
Protection Agency.
Maximum Residual Disinfectant Level
(MRDL): The highest level of a disinfectant
allowed in drinking water. There is convincing
evidence that addition of a disinfectant is
necessary for control of microbial
contaminants.
Maximum Residual Disinfectant Level Goal
Pesticides and Herbicides, that may come from a variety of sources
(MRDLG): The level of a drinking water
such as agriculture, urban stormwater runoff, and residential uses;
disinfectant below which there is no known or
expected risk to health. MRDLGs do not
Organic Chemical Contaminants, including synthetic and volatile
reflect the benefits of the use of disinfectants
organic chemicals, which are by-products of industrial processes and
to control microbial contaminants.
petroleum production, and which can also come from gas stations, urban
stormwater runoff, agricultural applications, and septic systems;
Radioactive Contaminants, that can be naturally occurring or can be
the result of oil and gas production and mining activities.
More information about contaminants and potential health effects can be
obtained by calling the U.S. EPA's Safe Drinking Water Hotline at (800)
426-4791.
I1p
lances and Exemptions: State Board permission to exceed an
L or not comply with a treatment technique under certain conditions.
not detectable at testing limit
m: parts per million or milligrams per liter (mg/L) ppb: parts per
billion or micrograms per liter (Ng/L) ppt: parts per trillion or nanograms
per liter (ng/L)
ppq: parts per quadrillion or picogram per liter (pg/L)
pCi/L: picocuries per liter (a measure of radiation)
Primary Drinking Water Standards (PDWS):
MCLs and MRDLs for contaminants that affect
health along with their monitoring and
reporting requirements, and water treatment
requirements.
Secondary Drinking Water Standards
(SDWS): MCLs for contaminants that affect
taste, odor, or appearance of the drinking
water. Contaminants with SDWSs do not
affect the health at the MCL levels.
Treatment Technique (TT): A required
process intended to reduce the level of a
contaminant in drinking water.
Regulatory Action Level (AL): The
concentration of a contaminant which, if
exceeded, triggers treatment or other
requirements that a water system must follow.
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DISINFECTIONBY-PRODUCTS
Contaminant
# Samples,
Average
Range
MCL (MRDL)
MCLG
Typical Source of Contaminant
Frequency
Level
(MRDLG)
Chlorine Residual (ppm)
1 per month
0..48
0.42-0.52
4
4
Drinking water disinfectant added for
treatment
Total Trihalomethanes
1 on
21
N/A
80
N/A
By-product of drinking water
b
9/11/18
1
1
idisinfection
Haloacectic Acids (ppb)
1 on
9.0
N/A
60
N/A
By-product of drinking water
9/11/18
disinfection
TABLE
3 — DISTRIBUTION
SYSTEM
CUSTOMER
TAP
SAMPLING
FOR LEAD AND
COPPER
90th
Date Last
No. of
percentile
No. sites
Lead and Copper
Sampled
samples
level
exceeding
AL
PHG
Typical Source of Contaminant
collected
detected
AL
Internal corrosion of household water
Lead (ppb)
08/10/16
5
1.5
0
15
0.2
plumbing systems; discharges from
industrial manufacturers; erosion of natural
deposits
Internal corrosion of household
Copper (ppm)
08/10/16
5
0.074
0
1.3
0.3
plumbing systems; erosion of natural
deposits; leaching from wood
preservatives
TABLE
4 — SAMPLING
RESULTS FOR SODIUM
AND
HARDNESS
Chemical or Constituent
Date Last
Level
Range of Detections
MCL
PHG
PHG
Source of Contaminant
(reporting units)
Sampled
Detected(MCLG)
Sodium (ppm)
2016
43
N/A
N/A
N/A
Salt present in the water and is generally
naturally occurring
Sum of polyvalent cations present
Hardness (as CaCO3) (ppm)
2016
91
N/A
N/A
N/A
in the water, generally magnesium and
calcium, and are usually naturally
5-
UNREGULATEDTABLE COMPOUNDS
Chemical or Constituent
Date Last
Level Detected
Range of
MCL
PHG
Typical Source of Contaminant
(reporting units)
Sampled
Detections
(MCLG)
Alkalinity (as CaCO3) (ppm)
2016
150
N/A
N/A
N/A
Erosion of natural deposits
Bicarbonate Alkalinity (as
2016
180
N/A
N/A
N/A
Leaching of natural deposits
HCO3) (ppm)
Calcium (ppm)
2016
15
N/A
N/A
N/A
Erosion of natural deposits
Magnesium (ppm)
2016
13
N/A
N/A
N/A
Erosion of natural deposits
Potassium (ppm)
2016
7.4
N/A
N/A
N/A
Erosion of natural deposits
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TABLE
6�13ETECTION
OF •
.
.••.
Chemical or Constituent
Date Last
Level Detected
MCL
PHG
Typical Source of Contaminant
(reporting units)
Sampled
4N/,D,-6.6
(NiCLG)
Arsenic (ppb)
2016
4.2
10
0.004
Erosion of natural deposits
Barium (ppm)
2016
74
oN/A
1000
2000
Erosion of natural deposits
Fluoride (ppm)
2016
0.09
N/A
2
1
Erosion of natural deposits
Turbidity (NTU)
2016
2.30
N/A
5
5
Soil runoff
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
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
Level Detected
Range of
MCL
PHG
Typical Source of Contaminant
(reporting units)
Sampled
Detections
(MCLG)
Chloride (ppm)
2016
6
N/A
250
N/A
Leaching of natural deposits
Iron (ppb)
2016
90
N/A
300
N/A
Leaching of natural deposits
Manganese (ppb)
2016
5.90
N/A
50
N/A
Leaching of natural deposits
pH
2O16
8.0
7.7 - 8.3
6.5 - 8.5
N/A
Erosion of natural deposits
Specific Conductance
2016
350
N/A
1600
N/A
Substances that form ions when in
(µS/cm)
water.
Sulfate
2016
14
N/A
250
N/A
Leaching of natural deposits
Total Dissolved Solids
2016
260
N/A
500
N/A
Leaching of natural deposits
(ppm)
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