HomeMy WebLinkAboutMain System 2016 CCR FinalTruckee Donner Public Utility District
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Truckee Donner Public Utility District (TDPUD) vigilantly
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safeguards its mountain groundwater supplies
Last year, your tap water met all EPA and State drinking water
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health standards. This document is a snapshot of the quality of
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water provided to customers for the 2016 calendar year. Included
are details about where your water comes from, what it contains,
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and how it compares to State and USEPA Standards.
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TDPUD is committed to providing you with the information about
potable.
your water supply because customers who are well informed are
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the District's best allies in supporting improvements that are
necessary to maintain the highest drinking water standards.
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or More Informatior
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About this report or the water treatment process, contact
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Truckee Donner Public Utility District's Senior Water Quality
Technician, Julie Nelson, at (530) 582-3926.
About water conservation and efficiency, the TDPUD has
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water conservation programs that will help customers save
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water and save money. Information can be found on the
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TDPUD website at www.tdpud.org, or by calling (530)
587-3896.
Drinking water served to
Truckee Donner Public
CustomerviewsAre Welcom
Utility District customers in
the Truckee system is
If you are interested in participating in the decision -making
groundwaterthat comes
process of the Truckee Donner Public Utility District, you are
from 12 deep wells.
welcome to attend Board meetings. The Board of Directors
meets at 6:00 PM on the first and third Wednesday of each
Each week the system is
month in the TDPUD Board room located at 11570 Donner Pass
sampled form icrobial
Road, Truckee, California. Agendas for upcoming meetings may
quality. Because of
be obtained on our website at www.tdpud.org or from the
natural filtration, the
groundwateraquifer is
Deputy District Clerk's office, (530) 582-3980.
protected from surface
contamination. This gives
us high quality water.
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 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 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 managed. The TDPUD water distribution system contains no lead water service laterals of which the District's staff is
aware.
The LCMR initial sampling requirements call for lead and 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
2016, where all 30 of the District's sampling locations tested below the Federal Action Level for lead and copper. The next round of
sampling will take place in the Summer of 2019.
Recent reports and news stories related to the lead exposures within the Flint, Michigan public water system may have generated
questions or concerns regarding risks associated with local water supplies. It is important to understand that the conditions faced by Flint,
Michigan 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
concentrations 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
language 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 monitoring
and reporting requirements, and water treatment requirements.
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 (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 drinking
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-
poridium 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) pS/
ppb—Parts per billion, or micrograms per liter (ug/ cm —Micro Siemens per centimeter
L) > - 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 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 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 June through October in 2016. The arsenic test results at
the blending point ranged from a low of 5.6 ppb to a high of 9.0 ppb with an average
of 6.7 ppb. The MCL for arsenic is 10 ppb.
GENERAL INFORMATION
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
following 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
located at 11570 Donner Pass Road, Truckee,
CA or by calling Brian Wright at (530) 582-3957.
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, 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 microbial
contaminants are available from the Safe
Drinking Water Hotline at 1-800-426-4791.
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. 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/
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 fanning.
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
Health (Department) prescribe regulations that limit the amount of certain contaminants in water provided by public water systems.
Department regulations also establish limits for contaminants in bottled water that must provide the same protection for public health.
ABLE I —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 2 samples in a
Total Coliform Bacteria
1
0
0
Naturally present in the environment
month with a detection
— DISINFECTION BYPRODUCT
Contaminant
# Samples,
Average
Range
MCL (MDRL)
MCLG
Typical Source of Contaminant
Frequency
Level
(MDRLG)
Chlorine Residual (ppm)
40-50 per
0.37
0.36 - 0.38
4
4
Drinking water disinfectant added for
month
treatment
By-product of drinking water disinfection
Total Trihalomethanes (pp ) b
2 on 8/10/16
6.0
4.2 - 7.8
80
N/A
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
AL
PHG
Typical Source of Contaminant
collected
detected
Internal corrosion of household water
Lead b
(pp)
August
30
3.0
0
15
0.2
plumbing systems; discharges from
2016
industrial manufacturers; erosion of natural
deposits
Internal corrosion of household
Copper m
pp (ppm)
August
30
0.083
0
1.3
0.3
plumbing systems; erosion of natural
2016
deposits; leaching from
wood preservatives
TABLE 4 —SAMPLING RESULTS FOR SODIUM AND HARDNESS
Chemical or Constituent
Date Last
Range of
PHG
(reporting units)
Sampled
Level Detected
Detections
MCL
(MCLG)
Typical Source of Contaminant
Sodium (ppm)
2016
11.9
4.4 - 29.0
N/A
N/A
Salt present in the water and is generally
naturally occurring
Sum of polyvalent cations present
in the water, generally magnesium and
Hardness (ppm)
2016
64.6
37.0 - 98.0
N/A
N/A
calcium, and are usually naturally -
occurring
D COMPOUND
Range of MCL PHG
Detections (MCLG)
Chemical or Constituent
(reporting units)
Date Last
Sampled
Level Detected
Typical Source of Contaminant
Alkalinity (as CaCO3) (ppm)
2016
69
54 - 90
N/A
N/A
Naturally present in water
Bicarbonate Alkalinity (as HCO3)
(ppm)
2016
92
66 -110
N/A
N/A
Naturally present in water
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 6 — DETECTION OF CONTAMINANTS WITH A PRIMARY DRIN WA
ER STANDARD
Chemical or Constituent
Date Last
Level Detected
Range of
MCL
PHG
Typical Source of Contaminant
(reporting units)
Sampled
Detections
(MCLG)
Inorganic Contaminants
Arsenic (ppb)
2016
4.30
N/D - 10
10
0.004
Erosion of natural deposits
Barium (ppb)
2016
13.90
5.8 - 31
1000
2000
Erosion of natural deposits
Chromium (ppb)
2016
0.30
N/D - 1.3
100
100
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)
2016
0.20
N/D-1.2
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
adioactive Contaminants
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 DRINKING WATER STANDARD
Chemical or Constituent
Date Last
Range of
PHG
(reporting units)
Sampled
Level Detected
Detections
MCL
(MCLG)
Typical Source of Contaminant
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
(µS/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)