HomeMy WebLinkAbout19 Water Quality Consumer Confidence Reportenda Item #
To: Board of Directors
From: Brian Wright
Date: May 16, 2018
Subject: Consideration to Approve the Truckee Donner Public Utility
District's 2017 Water Quality Consumer Confidence Report
19
1. WHY THIS MATTER IS BEFORE THE BOARD
Water Department staff has prepared the 2017 Consumer Confidence Reports (Water
)uality) 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 mailina a Drinted copy.
3. NEW INFORMATION
The 2017 CCRs have been prepared by the District's Water Department for each
system and approved by the SWRCB for submittal.
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 and electric bills, via a district
Al stuffier, 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.
4. FISCAL IMPACT
The costs associated with the preparation and distribution of the 2017 Consumer
Confidence Reports are included in the Board approved FY18/19 Water Operations
Budget,
5. RECOMMENDATION
Approve the District's Truckee -Main System and Hirschdale System 2017 Consumer
Confidence Reports for public distribution.
VrZ j I ' --
Michael D. Holley
General Manager / Water Utility Manager
Truckee Donner Public Utility District
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.
- �----sue-- —Ta-
TRUCKEE DONNER
PUBLIC UTILITY DISTRICT
Photo by Tim Erskine I OErskine Creative Photography
Water Quality
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
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)42&4791 or https://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 sitting 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
source 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.
Radon
adon is a radioactive gas that you cannot
JJLNsee, 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 (1-800-745J236), the
USEPA Safe Drinking Water Hotline (1-800426-
4791), or the National Safety Council Radon
Hotline (1-800-SOS-RADON).
Water Hardness
®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.
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
D ninitio'"
Maximum Contaminant Level (MCL): The highest
leveI 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.
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),
drink, the U.S. Environmental Protection
Agency (USEPA) and the State Water MW 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. State Board regulations also establish limits
for contaminants in bottled water that provide the same protection for public
health. Drinking water, including bottled water, may reasonably be expected to
contain at least small amounts of some contaminants. The presence of
contaminants does not necessarily indicate that water poses a health risk.
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 - - ------
4791
Table Key
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/I)
ppt: parts per trillion or nanograms per liter (ng/L)
pCi/L: picocuries per liter (a measure of radiation)
(NS/cm): micro Siemens per centimeter
(NTU): nephelometric turbidity unit (measures water cloudiness)
Environmental Protection Agency,
Maximum Residual Disinfectant Level (MRDL): The
highest level of a disinfectant allowed in drinking water.
The
disi
re is convincing evidence that addition of a
nfectant is necessary for control of microbial
contaminants.
Maximum Residual Disinfectant Level Goal (MRDLG):
The level of a drinking water disinfectant below which
the
not
re is no known or expected risk to health. MRDLGs do
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 (SDVVS): 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.
i
TRUCKEE DONNER
f" - , PUBLIC UTILITY DISTRICT
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 I — SAMPLING RESULTS SHOWING THE DETECTION OF COLIFORI4I BACTERLA
Microbiological Contaminants
Highest No.ctions
No. of months in violation
IlICL
MCLG
Typical Source of Bacteria
fDete
of Detections
Total Coliform Bacteria
0
0
More than 2 samples in a
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
(MDRLG)
40-50 per
Drinking water disinfectant added for
Chlorine Residual (ppm)
month
0.38
0.02 - 0.48
4
4
treatment
Byproduct of drinking water disinfection
Total Trihalomethanes (ppb)
2 on 8/23/17
8.0
7.9 - 8.1
80
NIA
LE 3 —DISTRIBUTION SYSTEM CUS_TOIVIER TAP SAMPLING FOR LEAD AND COPPER
_TAB_
901n
Lead and Copper
Date Last
No. of
samples
percentile
No. sites
AL
PHG
Typical Source of Contaminant
Sampled
level
exceeding AL
collected
detected
Internal corrosion of household water
August
plumbing systems; discharges from
Lead (ppb)
2016
30
3.0
0
15
0.2
industrial manufacturers; erosion of natural
deposits
Internal corrosion of household
August
0.3
plumbing systems; erosion of natural
Copper (ppm)
pp pp
2016
30
0.083
0
1.3
deposits; leaching from
wood preservatives
TABLE 4 —SAMPLING RESULTS FOR SODHJM AND H_4RDNESS
Chemical or Constituent
Date Last
Average Level
Range of
MCL
PHG
Typical Source of Contaminant
(reporting units)
Sampled
Detected
Detections
(MCLG)
Salt present in the water and is generally
Sodium (ppm)
2016
11.9
4.4 - 29.0
N/A
N/A
naturally occurring
Sum of polyvalent cations present
Hardness (ppm)
2016
64.6
37.0 - 98.0
NIA
N/A
in the water, generally magnesium and
calcium, and are usually naturally -
occurring
TABLE 5- UNREGULATED COMPOUNDS
Chemical or Constituent
Date Last
Average Level
Range of
➢'ICL
PHG
Typical Source of Contaminant
(reporting units)
Sampled
Detected
Detections
(MCLG)
Alkalinity (as CaCO3) (ppm)
2016
69
54 - 90
N/A
NIA
Naturally present in water
Bicarbonate Alkalinity (as HCO3)
2016
92
66 - 110
N/A
N/A
Naturally present in water
(ppm)
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
3A
2 - 8.5
N/A
N/A
Leaching of natural deposits
TABLE 6 —DETECTION OF CONTAMINANTS WITH A PRIMARY DRINKING WATER STANDARD
Chemical or Constituent
Date Last
Average Level
Range of
PHG
(reporting units)
Sampled
Detected
Detections
MCL
(MCLG)
Typical Source of Contaminant
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
10
10
Erosion of natural deposits
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
Radioactive Contaminants _ ti
Gross Alpha Particle 2007-2016 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 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 DRIlVKING 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
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
(AS/cm)
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
(ppm)
Truckee Donner Public Utility District
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
inforuiatiou about
us, please visit our
website at
�iww.tdpud.org .
Water Quality
Vruckee 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)4264791 or https://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 sitting 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
T�j
he 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
ince 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 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.
1;
0
Substances That Could Be In Water
The 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
provided by public water systems. State Board regulations also establish limits
for contaminants in bottled water that provide the same protection for public
health. Drinking water, including bottled water, may reasonably be expected to
contain at least small amounts of some contaminants. The presence of
contaminants does not necessarily indicate that water poses a health risk.
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
g as ariculture, urban stormwater runoff, and residential uses;
Maximum Contaminant Level (MCL): The highest
leveI of a contaminant that is allowed in drinking water. M
Primary MCLs are set as close to the PHGs (or CLGs)
as is economically and technologically feasible.
Secondary MCLs are set to protect the odor, taste, and
appearance of drinking water.
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
Environmental Protection Agency.
Maximum Residual Disinfectant Level (MRDL): The
highest level of a disinfectant allowed in drinking water.
The
disi
re is convincing evidence that addition of a
nfectant is necessary for control of microbial
contaminants.
Maximum Residual Disinfectant Level Goal (MRDLG):
The level of a drinking water disinfectant below which
ther
not
e is no known or expected risk to health. MRDLGs do
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.
Organic Chemical Contaminants, including synthetic and volatile organic Secondary Drinking Water Standards (SDWS): MCLs
chemicalsI which are by-products of industrial processes and petroleum for contaminants that affect taste, odor, or appearance of
production, and which can also come from gas stations, urban stormwater the drinking water. Contaminants with SDWSs do not
runoff, agricultural applications, and septic systems; 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.
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,
Table Key
NIA: not applicable
NID: not detectable at testing limit
ppm: 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)
pCUL: picocuries per liter (a measure of radiation)
(pS/cm): micro Siemens per centimeter
(NTU): nephelometric turbidity unit (measures water cloudiness)
Regulatory Action Level (AL): The concentration of a
contaminant which, if exceeded, triggers treatment or
other requirements that a water system must follow.
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 I — SAI4IPLING RESULTS SHOWING THE DETECTION OF COLLFORM BACTERLA
HigheMicrobiological Contaminants fDet c ionNo. No. violation
months in MCL MCLG Typical Source of Bacteria
of Detections violation
More than 1 sample in a
Total Coliform Bacteria 0 0 month with a detection 0 Naturally present in the environment
G -
Contaminant
# Samples,
Average
Range
NICL (NIRDL)
MCLG)
Typical Source of Contaminant
Frequency
Level
(MRDLG
Chlorine Residual (ppm)
1 per month
0.52
0.39 - 0.59
4
4
Drinking water disinfectant added for
treatment
Total Trihalomethanes
I on
25
N/A
80
N/A
By-product of drinking water
( b)
8/23/17
1
1
disinfection
Haloacectic Acids (ppb)
I on
8.5
N/A
60
1
N/A
By-product of drinking water
8/23/17
1
disinfection
90m
No. of
Date Last
percentile
No. sites
Lead and Copper Sampled
samples level
exceeding AL AL
PHG Typical Source of Contaminant
collected
detected
Internal corrosion of household water
5
0
plumbing systems; discharges from
Lead (ppb)
08/10/16
1.5
15
0.2
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
Chemical Constituent Date Last PHCrMCLG
Level Detected Range of Detections MCL Typical Source of Contaminant
ng units) Sampled
(reporting
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 occurring
T 5-
Chemical or Constituent
re Porting units)
(reporting
Date Last
Sampled
Level Detected
Range of
Detections
MCL
PHG
(MCLG)
Typical Source of Contaminant
Alkalinity (as CaCO3) (ppm)
2016
150
N/A
N/A
N/A
Erosion of natural deposits
Bicarbonate Alkalinity (as HCO3)
(ppm)
2016
180
N/A
N/A
N/A
Leaching of natural deposits
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
TABLE 6—DETECT ONOYCONTAMINANTSWITH A PRIMARY DRINKING WATE S Y A
Chemical or Constituent
(reporting units)
Date Last
Sampled
Level Detected
Range of
Detections
DICL
PHG
(IsICLG)
Typical Source of Contaminant
Inorganic Contaminants
Arsenic (ppb)
2016
4.2
N/D-6.6
10
0.004
Erosion of natural deposits
Barium (ppm)
2016
74
N/A
1000
2000
Erosion of natural deposits
Fluoride (ppm)
2016
0.09
N/A
2
1
Erosion of natural deposits
Turbidity (NTU)
2016
230
N/A
5
5
Soil runoff
Radioactive Contaminants
Gross Alpha Panicle
Activity (pCi/L)
2014
N/D
N/D
15
0
Erosion of natural deposits
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.
T_4BLE 7—D� ECTION OF CONT.-�itiIL�N:�NTS �YITR A SECONDARY DRINKI,`1G W.-TER STANDARD
Chemical or Constituent
Date Last
Level Detected
Range of
MCL
PHG
Typical Source of Contaminant
( re orting units
p )
Sampled
p
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
(pS/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)