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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 water provided
to customers for the 2011 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 Dis-
trict's best allies in supporting improvements that are necessary to maintain the highest drinking water standards.
For More Information
• About this report or the water treatment process, contact Truckee Donner Public Utility District's Senior Water Quality Tech, Paul Rose at
(530) 582-3926.
• About a group or class presentation, contact the Truckee Donner Public Utility District at (530) 587-3896.
• 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 by calling (530) 582-3931.
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 www.tdpud.org or
from the Deputy District Clerk's office, (530) 582-3909.
Where Does Our Water
Come From?
The drinking water served
to Truckee Donner Public Util-
ity District customers in the
Truckee system is groundwa-
ter coming from 12 deep
wells.
Each week the system is
sampled for microbial quality.
Because of natural filtration,
the groundwater aquifer is
protected from surface con-
tamination. This gives us
high quality water.
Source Water
Assessment
A source water assess-
ment 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 collec-
tion systems, utility stations,
railroads, and herbicide use.
A copy of the complete as-
sessment may be viewed at
the Truckee Donner Public
Utility District office located at
11570 Donner Pass Road,
Truckee, CA or by calling
Mark Thomas at (530) 582-
3957.
Some people may be
more vulnerable to contami-
nants in drinking water than
the general population. Im-
muno-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 el-
derly, and infants can be par-
ticularly at risk from infec-
tions. 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 contami-
nants are available from the
Safe Drinking Water Hotline
at1-800-426-4791.
11
TRUCKEE MAIN WATER SYSTEM
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).
Lead
If present, elevated levels of lead can cause serious health problems, especially for
pregnant women and young children. Lead in drinking water is primarily from materi-
als and components associated with service lines and home plumbing. Truckee Don-
ner Public Utility District is responsible for providing high quality water, but cannot con-
trol 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. If you
are concerned about lead in your water, you may wish to have your water tested. In-
formation on lead in drinking water, testing methods, and steps you can take to mini-
mize exposure is available from the Safe Drinking Water Hotline or at http://
www.epa.gov/safewater/lead.
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
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.
DETECTED
evCOMPOUNDS
The data presented in this table is from the most recent monitoring done in compliance with regulations. Some data is more than a year old.
Airport Northside Mantis Southside "A" Glenshire Sanders Prosser Prosser Well Prosser Old Violation Major Origins in
Primary
MCL
PHG
Contaminants
(MCLG)
Well Well Valley Well # 2 Well Dr Well Well Annex Heights 20 Village Greenwood Drinking Water
(PDWS)
Well Well Well Well Well
Arsenic (ppb)
10
0.004
9.8
N/D
8
N/D
N/D
9.4
8.9
N/D
N/D
N/D
N/D
2.4
NO
Erosion of
Fluoride (ppm)
2
1
N/D
0.011
N/D
N/D
N/D
N/D
N/D
1 0.05
N/D
N/D
0.11
N/D
NO
natural deposits
Nitrate (asNO3) (ppm)
45
45
2.9
N/D
1.9
3.7
N/D
2
N/D
N/D
N/D
1.2
2.1
N/D
NO
Leaching of natural
deposits, sewage,
Nitrite (ppm)
1
1
N/D
N/D
N/D
N/D
N/D
N/D
N/D
N/D
N/D
N/D
N/D
0.79
NO
runoff from fertilizer
use.
Radionuclides
Radon (pCi/L)
N/A
N/A
1600
990
N/T
885
540
765
1050
740
N/D
293
560
530
N/A
Erosion of natural
deposits
Regulated Contaminants with Secondary MCLs (a) (SDWS)
Color (ACU)
15
15
N/D
N/D
N/D
N/D
N/D
N/D
N/D
N/D
3
N/D
5
N/D
NO
Natural -occurring
organic materials
Odor
3
3
2
1
N/D
1
1
N/D
1
1
1
1
N/D
1
NO
Iron (ppb)
300
300
N/D
N/D
6
N/D
N/D
N/D
N/D
N/D
N/D
N/D
N/D
N/D
NO
Chloride (ppm)
500
500
5.5
17
7.1
5.7
N/D
12
53
N/D
N/D
N/D
6.4
2.2
NO
Copper (ppm)
1
1
N/D
N/D
87
0.04
N/D
N/D
0.28
0.02
N/D
N/D
N/D
N/D
NO
Leaching from
natural
Manganese (ppb)
50
50
N/D
N/D
6.4
N/D
N/D
N/D
N/D
N/D
N/D
N/D
N/D
26
NO
deposits
Total Dissolved Solids (ppm)
1000
1000
126
170
120
112
68
140
230
112
110
110
108
110
NO
Sulfate (ppm)
500
500
4.1
8.9
3.5
1.3
N/D
6.7
16
N/D
N/D
N/D
1.4
1.1
NO
Specific Conductance
1600
1600
187
241
160
160
107
200
360
166
166
166
180
160
NO
Substances that form
(PS/Cm)
ions when in water
pH
N/A
N/A
8.1
8.3
8.1
7.1
7.4
8.3
8
8.1
8.3
8.1
8.2
8
N/A
Leaching of natural
deposits
Unregulated General Minerals
Hardness (ppm)
N/A
N/A
67
77
57
92
44
72
97
41
72
56
55
62
N/A
Leaching of
natural deposits
Sodium (ppm)
N/A
N/A
10
32
9.3
4.9
3.5
12
29
15
6.4
12
16
8.5
N/A
Microbial
MCL
TDPUD System Highest Month
Contaminants
Total Coliform Bacteria
> Than 2 positive samples or more than
Naturally present in
5% positive samples per month
0.0 %
NO
the
environment
Copper/Lead
AL
MCLG
TDPUD Water System 90th Percentile Value
# of Sites
# of Sites that Exceeded Action Level
Sampled
Corrosion of
Copper (ppm)
1.3
0.3
0.074
30
0
NO
household
plumbing systems.
Flushing prior to use
Lead (ppb)
15
2
2
30
0
NO
recommended
Disinfection
MRDL
MRDLG
Average
Range for TDPUD Water System
Residual
Drinking Water
Chlorine (ppm)
4
4
0.35
0.32 - 0.47
NO
Disinfectant added for
treatment
Disinfection
MCL
PHG
Average
Range for TDPUD Water System
Sample Date
Byproducts
(MCLG)
By-product of
Total Trihalomethanes (ppb)
80
N/A
3.8
N/D - 6.2
08/04/2011
NO
drinking water
disinfection
Arsenic above 5 ppb up to 10 ppb: 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.
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 livestock operations and wildlife.
• Inorganic contaminants, such as salts and metals, that can be naturally -occurring or result from urban storm -
water 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 min-
ing 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.
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/index.cfm.
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. Prima-
ry 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 con-
trol 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 Cryptosporidium 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.
N/D- not detectable at testing limit pCi/L (Picocuries per Liter) - A measure of radioactivity.
ppm-Parts per million, or milligrams per liter (mg/L) NIT- not tested
ppb-Parts per billion, or micrograms per liter (ug/L) N/A -Not Applicable
pS/cm-Micro Siemens per centimeter ACU (Apparent Color Unit) - A measure of color in
> - Greater than drinking water.