HomeMy WebLinkAbout18 Review Consumer Confidence Reportsenda Item #
To: Board of Directors
From. Brian Wright
Date. May 04, 2016
Subject: Review the 2015 TDPUD Consumer Confidence Reports (Water
Quality Reports)
1. WHY THIS MATTER IS BEFORE THE BOARD
Water Department staff has prepared the 2015 Consumer Confidence Reports. Prior
to distribution to our customers, staff reviews the reports with the Board.
2. HISTORY
The 1996 amendment to the Safe Drinking Water Act 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.
The District prepares two reports: one report for the Truckee -Main water system and a
second report for the Hirschdale water system. The State Water Resources Control
Board (SWRCB) requires the District to mail or direct deliver a copy of the appropriate
report to each of its customers no later than July 1st of each year. In 2012, the State
included a provision that allows the District to provide customers with a "one -click"
weblink access to the CCR in lieu of mailing a printed copy.
3. NEW INFORMATION
The 2015 Consumer Confidence Reports have been prepared by the District's Water
Division and approved by the State Water Resources Control Board (SWRCB).
There were no reportable violations over the Maximum Contaminant Levels (MCL) set
by State and Federal regulatory agencies.
Customers will be notified in their June monthly water and electric bills that the CCR's
are now ready to be viewed via a "one -click" link on the District website. Printed
copies of the CCR will be made available for customers upon request. The Truckee.
Main Water System and Hirschdale Water System reports are included as
Attachments 1 and 2 respectively.
4. FISCAL IMPACT
The costs associated with the preparation and distribution of the 2015 Consumer
Confidence Report are included in the Board approved FY16/17 Water Operations
Budget.
5. RECOMMENDATION
Receive this report and provide input to staff.
Michael D. Holley
General Manager / Water Utility Manager
ATTACHMENTI
�TRUCKEE DONNER
Public Utility District
TruCkee Donner PUD11C Utility ®istrict
Truckee Donner Public Utility District (TDPUD) vigilantly
safeguards its mountain groundwater supplies
Last year, your tap water met all EPA and State drinking water
health standards. This brochure is a snapshot of the quality of wa-
ter provided to customers for the 2015 calendar year. Included in
this pamphlet are details about where your water comes from, what
it contains, and how it compares to State and USEPA Standards.
TDPUD 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 neces-
sary to maintain the highest drinking water standards.
For More Information
• About this report or the water treatment process, contact Truck-
ee Donner Public Utility District's Senior Water Quality Tech,
Julie Nelson at (530) 582-3926.
• About water conservation and efficiency, the TDPUD has new
water conservation programs that will help customers save wa-
ter and save money. Information can be found on the TDPUD's
website at www.tdpud.org or by calling (530) 582-3931.
Customer Views Are Welcome
If you are interested in participating in the decision -making pro-
cess of the Truckee Donner Public Utility District, you are welcome
to attend Board meetings. The Board of Directors meet 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, Califor-
nia. Agendas for upcoming meetings may be obtained on our web -
site at www.tdpud.org or from the Deputy District Clerk's office,
(530) 582-3909.
Este informe
contiene
informacion muy
importante sobre
su agua
potable.
Traduzcalo o hable
con alguien que to
entienda Bien.
Lead and Copper
The Lead and Copper Monitoring Rule (LCMR) was established by the U.S. Environmental Protection Agency (EPA) in 1991 with the goal
of reducing exposures to harmful levels of lead (Pb) and copper (Cu). According to the EPA, lead has been known to cause damage to
the brain, red blood cells and the kidney, especially in children and pregnant women. Copper has been known to cause stomach and in-
testinal distress, liver and kidney damage, and complications of Wilson's disease in genetically predisposed individuals. The current MCL
for lead (Pb) is .015 mg/L, and for copper is 1.3 mg/L. Sources of lead and copper contamination in public drinking water systems can be
traced back to lead service lateral pipe materials, as well as residential plumbing that contains copper with lead based solder. Leaching of
lead and copper from residential plumbing into drinking water is enhanced by the corrosive properties of the water, if not properly man-
aged. The TDPUD water distribution system does not contain lead water service laterals that the District's staff is aware of.
The LCMR initial sampling requirements call for lead an copper testing to be completed every six months. Once compliance has been
established, the sampling requirements are reduced to every three years. The last sampling period for the Truckee Main System was in
2013, where all 30 of the District's sampling locations tested "non -detect" for lead and copper. The next round of sampling will take place
in the Summer of 2016. The last round of sampling for the Hirschdale System was in 2015, where all five sample locations tested "non -
detect" for lead and copper.
Recent reports and news stories related to the lead exposures within the Flint, Michigan public water system may have generated ques-
tions or concerns regarding risks associated with local water supplies. It is important to understand that the conditions faced by Flint, Mich-
igan and other regions are significantly different than those faced locally with respect to water chemistry and plumbing infrastructure.
If you are concerned about lead in your water, you may wish to have your water tested. Information on lead and copper in drinking water,
testing methods, and steps you can take to minimize exposure is available from the Safe Drinking Water Hotline or at http://www.epa.gov/
TERMS USED IN THIS REPORT
Detected Compounds: The State allows us to monitor for some contaminants less than once per year because the concen-
trations of these contaminants do not change frequently. Some of our data, though representative, are more than one year old. Not
listed are the hundreds of other compounds for which we tested that were not detected.
Regulated Contaminants with Secondary MCLs (a): There are no PHGs, MCLGs, or mandatory standard health effects lan-
guage for these constituents because secondary MCLs are set on the basis of aesthetics.
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.
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.
Public Health Goal (PHG): The level of a contaminate in drinking water below which there is no known or expected risk to
health. PHGs are set by the California Environmental Protection Agency.
Primary Drinking Water Standards (PDWS): MCLs and MRDLs for contaminants that affect health along with their monitor-
ing and reporting requirements, and water treatment requirements.
Maximum Residual Disinfectant Level (MRDL): The highest level of a disinfectant allowed in drinking water. There is con-
vincing evidence that addition of a 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 of health. MRDLGs do not reflect the benefits of the use of disinfectants to control microbial contaminants.
Secondary Drinking Water Standards (SDWS): MCLs for contaminants that affect taste, odor, or appearance of the drink-
ing water. Contaminants with SDWSs do not affect the health a the MCL levels.
Regulatory Action Level (AL) : The concentration of a contaminant which, if exceeded, triggers treatment or other requirements
which a water system must follow.
Radiochemical Parameters —Compounds found in drinking water which emit radiation.
Microbial Parameters —Disease -causing organisms that, at certain levels, may be harmful. Additional information about Cryptos-
poridiurn and Giardia is supplied in this report.
Unregulated Compounds Analyzed —Unregulated Compounds Analyzed— Unregulated compounds that the Truckee Donner
Public Utility District has tested for. These compounds are not known to be associated with adverse health effects.
TABLE KEY
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 (ug/L) NS/cm—Micro Siemens per centimeter
> -Greater than pCi/L (Picocuries per Liter) - A measure of radioactivity.
N/T— not tested N/A —Not Applicable
ACU (Apparent Color Unit) - A measure of color in drinking water.
Radon
Radon is a radioactive gas that you cannot see, taste, or smell. It is found throughout
the U.S. 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. Ra-
don can also get into indoor air when released from tap water from showering, wash-
ing 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 EPA Safe Drinking Water Hotline (1-800-426-4791), or the National Safety Council
Radon Hotline (1-800-SOS-RADON).
No Cryptosporidium or Giardia in District Water
You may have seen or heard news reports about Cryptosporidium and Giardia, micro-
scopic organisms that can enter surface waters from run-off containing animal wastes.
If ingested, Cryptosporidium and Giardia can cause diarrhea, fever and other gastro-
intestinal symptoms. Because the Truckee Donner Public Utility District's water
comes from deep wells rather than surface water, it is almost impossible to have these
contaminants in the District's water supply.
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 to October in 2015. The Arsenic test re-
sults at the blending point ranged from a low of 5.0 ppb to a high of 5.5 ppb with an
average of 5.3 ppb.
source Water
Assessment
A source water assessment was prepared in
2002 for the wells serving the Truckee area. The
wells are considered most vulnerable to the fol-
lowing activities not associated with any detected
contaminants: sewer collection systems, utility
stations, railroads, and herbicide use. A copy of
the complete assessment may be viewed at the
Truckee Donner Public Utility District office locat-
ed at 11570 Donner Pass Road, Truckee, CA or
by calling Brian Wright at (530) 582-3957.
Some people may be more vulnerable to con-
taminants in drinking water than the general pop-
ulation. 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, and infants can be par-
ticularly 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 Cryptos-
poridium and other microbial contaminants are
available from the Safe Drinking Water Hotline at
1 800-426-4791,
Drinking water, including bottled wa-
ter, may reasonably be expected to contain at
least small amounts of some contaminants. The
presence of contaminants does not necessarily
cate that water poses a health risk. More
information about contaminants and potential
health effects can be obtained by calling the
USEPA's Safe Drinking Water Hotline at 1-800-
426-4791 or at http: water,epa.gov/drink/
GENERAL INFORMATION
The sources of drinking water (both tap water 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.
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 live-
stock operations and wildlife.
*Inorganic contaminants, such as salts and metals, that can be naturally -occurring or 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 agricultural, urban storm -water runoff and residential
uses.
•Organic chemical contaminants, including synthetic and volatile organic chemicals, that are by-products of industrial processes
and petroleum production, and can also come from gas stations, urban
storm -water runoff, agricultural application, and septic systems.
•Radioactive contaminants, that can be naturally -occurring or be the result of oil and gas production and mining activities.
In order to ensure that tap water is safe to drink, the U.S. Environmental Protection Agency (USEPA) and the State Department of Public
Lm
alth (Department) prescribe regulations that limit the amount of certain contaminants in water provided by public water systems. Depart-
ent regulations also establish limits for contaminants in bottled water that must provide the same protection for public health.
TA
Typical Source of Bacteria
iNIicrobiological Contaminants
Highest No.
No. of months in violation
MCL
1N4CLG
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 — DISINTECTION BYPRODUCTS
Contaminant
# Samples,
Average
Range
NICL
il4CLG
Typical Source of Contaminant
Frequency
Level
40-50 per
0.37-
Drinking water disinfectant added for
Chlorine Residual (ppm)
month
0.37
0.45
4
4
treatment
By-product of drinking water disinfection
Total Trihalomethanes (ppb)
2 on 8/12/15
3.75
3.3-4.2
80
N/A
`LE 3 — DISTRIB
MUSTONMER TAP SAMPLING FOR LEAD AND COPP71
90m
No. of
percentile
No. sites
Lead and Copper
Sample Date
samples
AL
PHG
Typical Source of Contaminant
level
exceeding AL
collected
detected
Internal corrosion of household water
August
plumbing systems; discharges from
Lead (ppb)
2013
30
N/D
0
15
0.2
industrial manufacturers; erosion of natural
deposits
Internal corrosion of household
August
plumbing systems; erosion of natural
Copper (ppm)
2013
30
0.054
0
1.3
0.3
deposits; leaching from
wood preservatives
TABLE 4 — SAMPLING RESULTS FOR SODIUM AND HARDIN�S
Chemical or Constituent
Sample Date
(reporting units)
Level Detected
Range of Detections
MCL
PHG (MCLG)
Typical Source of Contaminant
2006 —
Salt present in the water and is generally
Sodium (ppm)
2014
11.1
3.5-29
N/A
N/A
naturally occurring
Sum of polyvalent cations present
2006 —
in the water, generally magnesium and
Hardness (ppm)
66
41-97
N/A
N/A
calcium, and are usually naturally -occurring
2014
TABLE 5
— DETECTION
OF CONTAMINANTS WITH A PRIMARY
DRINKING
WATER ST
PHG
Chemical oil Constituent
Sample Date
Sample
Level Detected
Range of Detections
MCL
Typical Source of Contaminant
(reporting units)
VVIRDL]
Inorganic
]14RDLG]
2011-
Erosion of natural deposits
Arsenic (ppb)
3.10
N/D-9.9
10
0.004
2015
2006-
Erosion of natural deposits
Fluoride (ppm)
0.11
N/D-0. I
2.0
I
2014
Runoff and leaching from fertilizer use;
Nitrate as NO3 (ppm)
2014
1.10
N/D-4.9
45
45
leaching from septic tanks and sewage;
erosion of natural deposits
Nitrate as N (ppm)
2015
0.16
N/D-0.4
10
10
Radioactive
Gross Alpha Particle
G
2005 -
Erosion of natural deposits
3A
N/D-3.4
15
0
Activity (pCi/L)
2014
Erosion of natural deposits
Radon (pCi/L)
2004
545
530-560
N/A*
N/A*
*Note
The State of California does not have an MCL for Radon. The EPA has an advisory MCL of 4000
pCi/L for Radon.
TALI E 6 —DETECTION OF CONTAiViINANTS WITI3 A SECONDARY Dot IfI YCQ W4,TER STAtYDARD
Chemical or Constituent
Sample Date
Level Detected
Range of Detections
-IN1CL
PHG (NICLG)
Typical Source of Contaminant
(reporting units)
2006-
Naturally -occurring organic materials
Color (ACU)
2014
0.75
N/D-5.0
15
15
2006-
Leaching of natural deposits
Chloride (ppm)
2014
7.88
N/D-53
250
250
2006-
Erosion of natural deposits
Copper (ppm)
2014
7.57
NID-87
1000
1000
2006-
Leaching of natural deposits
Manganese (ppb)
2014
6.40
N/D-6.4
50
50
2006-
Naturally -occurring organic
Odor -Threshold
2014
0.75
N/D-2
3
materials
2006-
EN/A]
Leaching of natural deposits
PH
2O14
8.00
7.1-8.3
N/A
Specific Conductance
2006-
Substances that form ions when in
2014
183.30
N/D-360
1600
1600
water.
(µS/em)
2006-
Leaching of natural deposits
Sulfate
2014
2.91
N/D-16
500
500
Total Dissolved Solids
2006-
Leaching of natural deposits
2014
121.80
NID-230
1000
1000
(ppm)
nTTn(m%unnFKIT 9
1 1 / 1 ... • - - 1
Truckee Donner Public Utility District
2015 WATER QUALITY REPORT
rschdal�Wa � _� tem 011
Customer Views Are Welcome
If 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 meet 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 at ww.tdpud.org or from the Deputy
District Clerk's office, (530) 582- 3909.
For More Information
➢ About this report or the water treatment
process, contact Truckee Donner Public
Utility District's Senior Water Quality Tech,
Julie Nelson at (530) 582-3926.
➢ About water conservation and efficiency, the
TDPUD has new water conservation
programs that will help customers save water
and save money. Information can be found
on the TDPUD's website at www.tdpud.org
or contact TDPUD's Conservation
Department at (530) 582-3931.
V
RUCKEE DONNER
public Utility District
HIRSCHDALE
WATER SYSTEM
■
N
For more information
about us, please visit
our website at:
www,tdpud. org
Este informe contiene informacion
muy importante sobre su agua
potable. Traduzcalo o hable con
alguien que to entienda bien.
Water Quality
Truckee Donner Public Utility District vigilantly
safeguards its mountain groundwater supplies. We are
able to report that the District has met the California
Department of Public Health drinking water standards.
This brochure is a snapshot of the quality of water
provided to customers for the 2015 calendar year.
Included in this pamphlet 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 1-8004264791.
Where Does Our Water Come From
The source of the 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 tap.
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.
Source Water Assessment
A 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 located at 11570 Donner Pass
Road, Truckee, CA or by calling Brian Wright at (530)
582-3957.
No Cryptosporidium or Giardia
in District Water
You may have seen or heard news reports about Cryptosporidium and
Giardia, microscopic organisms that can enter surface waters from run-
off containing animal wastes. If ingested, Cryptospridium and Giardia
can cause diarrhea, fever and other gastrointestinal symptoms. Because
Truckee Donner Public Utility District's water comes from deep wells
rather than surface water, it is almost impossible to have these
contaminants in the District's water supply.
Radon
Radon is a radioactive gas that you cannot see, taste, or smell. It is
found throughout the U.S. 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 ofradon 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 EPA Safe Drinking Water Hotline (1-800-426-
4791), or the National Safety Council Radon Hotline (1-800-SOS-
RADON).
Lead and Copper
The Lead and Copper Monitoring Rule (LCMR) was established by the U.S.
Environmental Protection Agency (EPA) in 1991 with the goal of reducing
exposures to harmful levels of lead (Ph) and copper (Cu). According to the EPA,
lead has been known to cause damage to the brain, red blood cells and the kidney,
especially in children and pregnant women. Copper has been known to cause
stomach and intestinal distress, liver and kidney damage, and complications of
Wilson's disease in genetically predisposed individuals. The current MCL for lead
(Pb) is .015 mg/L, and for copper is 1.3 mg/L. Sources of lead and copper
contamination in public drinking water systems can be traced back to lead service
I pipe materials, as well as residential plumbing that contains copper with
Iead based solder. Leaching of lead and copper from residential plumbing into
drinking water is enhanced by the corrosive properties of the water, if not properly
managed. The TDPUD water distribution system does not contain lead water
service laterals that the District's staff is aware of.
The LCMR initial sampling requirements call for lead an copper testing to be
completed every six months. Once compliance has been established, the sampling
requirements are reduced to every three years. The last round of sampling Jul the
Hirschdale System was in 2015, where all five sample locations tested "non -
detect" for lead and copper.
If you are concerned about lead in your water, you may wish to have your water
tested. Information on lead and copper in drinking water, testing methods, and
steps you can take to minimize exposure is available from the Safe Drinking Water
Hotline or at http://wNvw.epa.gov/safeivater/lead.
The data hi the tables on the following pages is from the most recent monitoring done in compliance
with California drinking water reglilations. Some data may be more than a year old.
TABLE 1 — SAMPLING RESULTS SHOWING THE DETECTION OF COLIFORM BACTERIA
Microbiological
Contaminants
Highest No
°f
Detections
No. of months in
violation
MCL
MCLG
Typical Source of Bacteria
Total Coliform Bacteria
0
0
More than 1 sample in a
month with a detection
0
Naturally present in the
environment
Contaminant
# Samples,
Average
Range
MCL
MCLG
Typical Source of Contaminant
Frequency
Level
Chlorine Residual (ppm)
1 per month
0.52
0.43-
4
4
Drinking water disinfectant added
0 58
for treatment
Total Trihalomethanes
1 on
20
N/A
80
N/A
By-product of drinking water
(ppb)
8/21/15
disinfection
Haloacectic Acids (ppb)
1 on
11
N/A
60
N/A
By-product of drinking water
8/21/15
1
1
1
1 disinfection
90"'
Lead and Copper
Sample
No. of
percentile
No. sites
samples
exceeding
AL
PHG
Typical Source of Contaminant
Date
collected
level
AL
detected
Internal corrosion of household
water plumbing systems;
Lead (ppb)
12/18/15
5
N/D
0
15
0.2
discharges from industrial
manufacturers; erosion of natural
deposits
Internal corrosion of household
Copper (ppm)
12/19/15
5
0.053
0
1.3
0.3
plumbing systems; erosion of
natural deposits; leaching from
wood preservatives
Chemical or Constituent
(reporting emits)
Sample
Date
Level
Detected
Range of
Detections
MCL
PHG
(MCI,G)
Typical Source of Contaminant
Sodium (ppm)
2011
29
N/A
N/A
N/A
I Salt present in the water and is
generally naturally occurring
Hardness (ppm)
2011
89
N/A
N/A
N/A
Sum of polyvalent cations present
in the water, generally magnesium
and calcium, and are usually
naturally occurring
TABLE 5 —UNREGULATED GENERAL MINERALS
Chemical or Constituent
(reporting units)
Sample
Date
Level
Detected
Range of
Detections
MCL
[MRDL]
PHG
(MCLG)
MRDLG
Typical Source of Contaminant
Total Alkalinity (ppm)
2011
130
NIA
N/A
N/A
Erosion of natural deposits
Calcium (ppm)
2011
15
N/A
N/A
N/A
Erosion of natural deposits
Magnesium (ppm)
2011
13
N/A
N/A
NIA
Erosion of natural deposits
---TADLF,f -DETECTION OF CONTAMINANTS V HII AlaHAARY DRINi O WAfi ST A"
Chemical or Constituent
(reporting units)
Sample
Date
Level Range of
Detected Detections
MCL
[MRDLJ
PHG
(MCLG)
MRDLG
Typical Source of Contaminant
Inorganic Contaminants
Arsenic (ppb)
2015
2.5
N/D-6.6
10
0.004
Erosion of natural deposits
Barium (ppm)
2011
0.11
N/A
1
2
Erosion of natural deposits
Fluoride (ppm)
2011
0.12
N/A
2
1
Erosion of natural deposits
Radioactive Contaminants
Gross Alpha Particle
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.
TABLE 7 —DETECTION OF CONTAMINANTS WITH A SECONDARY DR --
Chemical or Constituent
(reporting units)
Sample
Date
Level
Detected
Range of
Detections
MCL
PHG
(MCLG)
Typical Source of Contaminant
Chloride (ppm)
2011
8
N/A
500
500
[Leaching of natural deposits
2015
10
N/D-90
300
300
Leaching of natural deposits
Iron (ppb)
pH
2O15
8.1
7.9-8.3
N/A
N/A
Leaching of natural deposits
Potassium (ppm)
2011
5.5
N/A
N/A
N/A
Erosion of natural deposits
Specific Conductance
([IS/cm)
2011
300
N/A
1600
1600
Substances that form ions when in
water.
Sulfate
2011
14
N/A
500
500
Leaching of natural deposits
Total Dissolved Solids
(ppm)
2011
250
N/A
1000
1000
Leaching of natural deposits
See next page for terms
used in these tables.
TERMS USED IN THIS REPORT
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.
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. There is convincing
evidence that addition of a disinfectant is
necessary for control of microbial
contaminants.
Maximum Residual Disinfectant Level Goal
(MItDLG): 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.
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.
Variances and Exemptions: State Board
permission to exceed an MCL or not comply with a
treatment technique under certain conditions.
ND: not detectable at testing limit
ppm: parts per million or milligrams per liter (mg/L)
ppb: parts per billion or micrograms per liter (µg/L)
ppt: parts per trillion or nanograms per liter (ng/L)
ppq: parts per quadrillion or picogram per liter
(per-)
pCi/L: picocuries per liter (a measure of radiation)
The sources of drinking water (both tap water 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.
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 contami�aants, such as salts and metals, that can be naturally -occurring or 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, that are by-
products of indush•ial processes and petroleum production, and can also come from gas stations,
urban stoirnwater runoff, agricultural application, and septic systems.
• Radioactive contar�linants, that can be naturally -occurring or be the result of oil and gas production
and mining activities.