HomeMy WebLinkAbout2018 South Tahoe Public Utility District
CONSUMER CONFIDENCE REPORT 2018
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IS MY WATER SAFE?Yes. Last year, as in years Department of Public Health (CDPH). domestic wastewater discharges, oil and gas encourages our customers to attend, ask
past,your tap water met all U.S. Environmental You may view the document by visiting the production, mining, or farming. Pesticides and questions, and provide feedback.
Protection Agency(EPA) and state drinking District's website at www.stpud.us or by herbicides, may come from a variety of sources RESULTS OF RADON MONITORING Radon is a
water health standards.The South Tahoe Public requesting a copy by calling Customer Service such as agriculture, urban stormwater runoff,
Utility District vigilantly safeguards its water at 530-544-6474. and residential uses. Organic chemical radioactive gas that cannot be seen, tasted or
supplies and we are proud to report that our The District has an ongoing drinking water contaminants, including synthetic and volatile smelled. It is found throughout the U.S. Radon
system has not violated a maximum contaminant source development program that seeks potential organic chemicals, are by-products of industrial can move up through the ground and into a
level or any other water quality standard. drinking water well locations. Due to the volume processes and petroleum production, and can home through cracks and holes in the
of the average annual Sierra snowpack and also come from gas stations, urban stormwater foundation. Radon can build up to high levels in
DO I NEED TO TAKE SPECIAL PRECAUTIONS? all types of homes. Radon can also get into
Lake Tahoe itself, our aquifer has a significant runoff, agricultural application and septic
Some people may be more vulnerable to indoor air when released from tap water from
recharge capability. The District continues to systems. Radioactive contaminants, can be
contaminants in drinking water than the showering,washing dishes, and other
work diligently to protect and maintain this naturally occurring or be the result of oil and
general population. Immuno-compromised household activities. Compared to radon
precious natural resource. gas production and mining activities. In order to
persons such as persons with cancer undergoing entering the home through soil, radon entering
ensure that tap water is safe to drink, the United
chemotherapy, persons who have undergone WHY ARE THERE CONTAMINANTS IN MY the home through tap water will, in most cases,
organ transplants, people with HIV/AIDS or DRINKING WATER?Drinking water, including States Environmental Protection Agency(Health be a small source of radon in indoor air. Radon
other immune system disorders, some elderly, bottled water, may reasonably be expected to and the California Department of Public Health is a known human carcinogen. Breathing air
and infants can be particularly at risk from contain at least small amounts of some (DPH) prescribe regulations that limit the amount containing radon can lead to lung cancer.
infections.These people should seek advice contaminants.The presence of contaminants of certain contaminants in water provided by Drinking water containing radon may also cause
public water systems. Food and Drug
about drinking water from their health care does not necessarily indicate that water poses a increased risk of stomach cancer. If you are
providers. EPA/Centers for Disease Control health risk. More information about Administration (FDA) regulations establish limits concerned about radon in your home, test the
CDC guidelines on a ro riate means to contaminants and potential health effects can be for contaminants in bottled water which must air in your home. Testingis inexpensive and
lessen the risk of infection by Cryptosporidium obtained by calling the Environmental Protection provide the same protection for public health. easy. Fix your home if the level of radon in your
and other microbial contaminants are available Agency's (EPA) Safe Drinking Water Hotline HOW CAN I FIND OUT MORE?The information air is 4 picocuries per liter of air (pCi/L) or
from the USEPA's Safe Water Drinking Hotline (1-800-426-4791). The sources of drinking contained in the Consumer Confidence Report higher. There are simple ways to fix a radon
(1-800-426-4791). water(both tap water and bottled water) include may not answer all the questions you may have problem that aren't too costly. For additional
WHERE DOES MY WATER COME FROM?There rivers, lakes, streams, ponds, reservoirs, springs, about the quality of the South Tahoe Public information, call your state radon program or
are 11 active drinking water wells and 4 and wells.As water travels over the surface of Utility District's drinking water supply. The call EPA's Radon Hotline
standby wells which supply more than 14,000 the land or through the ground, it dissolves District welcomes public participation in (800-SOS-RADON).
homes and businesses. All our drinking water is naturally occurring minerals and, in some cases, developing water quality policy. If you would RESULTS OF VOLUNTARY MONITORING
radioactive material, and can pick up like more detailed information, please call the
pumped from underground aquifers. No water See data sheets.
substances resulting from the presence of District Laboratory at 530-544-6474 extension
is taken from Lake Tahoe or any other surface
animals or from human activity. Microbial 6231, or check our website at www.stpud.us. REGARDING ARSENIC Arsenic is a naturally
water source.
contaminants, such as viruses and bacteria, may The District is governed by an elected five- occurring substance that is sometimes found at
SOURCE WATER ASSESSMENT AND come from sewage treatment plants, septic member Board of Directors. Board meetings are very low levels in drinking water, primarily
PROTECTION The District's Groundwater systems, agricultural livestock operations, and held on the first and third Thursday of each groundwater. The South Tahoe Public Utility
Management Plan (California Water Code wildlife. Inorganic contaminants, such as salts month at 2 p.m. at the Customer Service Facility District has an active Arsenic monitoring
Section 10750) was adopted on December 4, and metals, can be naturally occurring or result located at 1275 Meadow Crest Drive. All program, as well as a pilot Arsenic removal
2014 and is on file with the California from urban stormwater runoff, industrial, or meetings are open to the public and the District system in one of its wells.
SPANISH(ESPANOL)Este informe contiene informacion muy importante sobre la calidad de su agua de beber. Por favor hagalo traducir o hable con alguien que to entienda bien.
WATER QUALITY DATA TABLE The table below lists presented in this table is from testing done in the ADDITIONAL CONTAMINANTS In an effort to insure IMPORTANT DRINKING WATER
all of the drinking water contaminants which we calendar year of the report.The EPA or the State the safest water possible, the State has required us to DEFINITIONS
detected which are applicable for the calendar year requires us to monitor for certain contaminants less monitor some contaminants not required by Federal AL Action Level: The
of this report. The presence of contaminants in the than once per year because the concentrations of regulations. Of those contaminants only the ones concentration of a contaminant
water does not necessarily indicate that the water these contaminants do not change frequently. listed on the last page under"Additional which, if exceeded, triggers
poses a health risk. Unless otherwise noted, the data Contaminants"were found in your water. treatment or other requirements
which a water system must
follow.
MCLG/PHG MCL OR MRDL AVERAGE MIN MAX SAMPLE VIOLATION TYPICAL SOURCE MCL Maximum Contaminant
OR MRDLG DATE Level:The highest level of a
contaminant that is allowed in
MICROBIOLOGY drinking water. MCLs are set as
Total Coliforms(%Positive each month) 5 0 0 0 2018 No Naturally present in environment close to the MCLGs as feasible
using the best available
E.Coli(%Positive) 0 0 0 0 2018 No Human and animal fecal matter treatment technology.
Heterotrophic Plate Count or HPC(CFU) NA 0.2 ND 7.0 2018 No Naturally present in environment MCLG Maximum Contaminant
Level Goal: The level of a
Turbidity(NTU)The Turbidity limit for the 5 0.43 0.06 3.2 2018 No Soil runoff contaminant in drinking water
highest single measurement. below which there is no known
or expected risk to health.
INORGANIC CONTAMINANTS MCLGs allow for a margin of
safety.
Arsenic(ppb) 0.004 10 3.7 ND 8.3 2018 No Erosion of natural deposits;Runoff MNR Monitored Not
from orchards;Runoff from glass and Regulated
electronics production wastes
MPL Maximum Permissible
Fluoride(ppm) 1 2 0.08 0.08 0.15 2018 No Erosion of natural deposits; Level:As determined by the
Discharge from fertilizer and aluminum state of California
factories
MRDL Maximum Residual
Nitrate[measured as Nitrogen](ppm) 10 10 0.22 0.06 0.59 2018 No Runoff from fertilizer use;Leaching from Disinfectant Level:The highest
septic tanks,sewage;Erosion of natural level of a disinfectant allowed
deposits in drinking water.There is
Sodium(ppm) NA NA 12.0 4.5 29.0 2018 No Erosion of natural deposits;Leaching convincing evidence that
addition of a disinfectant is
necessary for control of
RADIONUCLEIDES microbial contaminants.
Gross Alpha(pCi/L),minus Uranium 15 2.7 0.04 6.2 2018 No Erosion of natural deposits MRDLG Maximum Residual
Disinfection Level Goal:The
Uranium(pCi/L) 0.43 20 5.2 0.41 15.0 2018 No Erosion of natural deposits level of a drinking water
Radium-226(pCi/L) 0.05 1.5 ND 2.6 2018 No Erosion of natural deposits disinfectant below which there
is no known or expected risk to
Radium-228(pCi/L) 0.019 0.66 ND 1.1 2018 No Erosion of natural deposits health. MRDLGs do not reflect
fRadium-226+Radium-228 5 2.2 ND 3.1 2018 No Erosion of natural deposits the bec disinfect thedisinfectants to cont rosecontrol
microbial contaminants.
VOLATILE ORGANIC CHEMICALS PDWS Primary Drinking Water
MTBE[Methyl Tert Butyl Ether] (ppb) 5 13 ND ND 0.4 2018 No Leaking underground fuel storage tanks Standards: MCLs for
contaminants that affect health
Total Trihalomethanes(ppb) NA 80 1.8 ND 12.0 2018 No By-product of drinking water disinfection along with their monitoring and
HaloAcetic Acids(ppb) NA 60 0.3 ND 1.9 2018 No By-product of drinking water disinfection reporting requirements, and
water treatment requirements.
1,2,3-TCP(ppb) 0.0007 0.005 ND ND ND 2018 No By-product of drinking water disinfection PHG Primary Health Goal:The
level of contaminant in drinking
water below below which there
1,2,3-TCP is a volatile man-made chemical which may be used as a solvent and is associated with pesticide products. It is suspected to be a human carcinogen.The South Tahoe is no known or expected risk to
Public Utility District sampled every one of its water sources for 1,2,3-TCP during the First,Second and Fourth Quarters of 2018.The Third Quarter was missed. In every single health. PHGs are set by the
instance the chemical was not detected.The Detection Limit is 0.005 ppb.The State Water Resources Control Board is allowing STPUD to make up for the fact that Third Quarter California Environmental
2018 sampling was missed by sampling for 1,2,3-TCP in the Third Quarter of 2019. Protection Agency.
INORGANIC CONTAMINANTS MCLG/PHG AL 90TH SAMPLE #SAMPLES EXCEEDS TYPICAL SOURCE UNIT DESCRIPTIONS
PERCENTILE DATE EXCEEDING AL AL pg/L:Micrograms per Liter, or
Lead-action level at consumer taps(ppb) ND 15 1.9 2017 1 No Corosion of household plumbing systems; parts per billion
Erosion of natural deposits mg/L:Milligrams per liter or
parts per million
Copper-action level at consumer taps(ppb) ND 1,300 144 2017 0 No Internal corrosian of household plumbing
systems;erosian of natural deposits; ppm: Parts per million, or
leaching from wood preservatives milligrams per Liter (mg/L)
ppb: Parts per billion, or
ADDITIONAL CONTAMINANTS UNITS STATE MCL AVERAGE VIOLATION SAMPLE DATE EXPLANATION AND COMMENT micrograms per Liter (pg/L)
ppt: Parts per trillion, or
Alkalinity-Total ppm NA 59.0 No 2018 Erosion of natural deposits nanograms per Liter
Aluminum ppb 1,000 ND No 2018 Erosion of natural deposits ppq: Parts per quadrillion, or
picograms per Liter
Barium ppb 2,000 12 No 2018 Erosion of natural deposits pCi/L: Picocuries per Liter (a
Bromide ppm NA 0.01 No 2018 Erosion of natural deposits measure of radioactivity)
Calcium ppm NA 13.6 No 2018 Erosion of natural deposits MFus Million Fibers per Liter,
used to measure asbestos
Carbon Dioxide,Free ppm NA 15.8 No 2018 Naturally occuring concentration
Chlorideppm 500 10.4 No 2018 Erosion of natural deposits NTU: Nephelometric is Turbidity
p Units. Turbidity is a measure
Chlorine,Free ppm 4 0.63 No 2018 By-product of disinfection process of the cloudiness of the
water. We monitor it
Chromium 6 ppb NA 0.42 No 2015 Erosion of natural deposits because it is a good
indicator of the effectiveness
Color Units 15 ND No 2018 Naturally occurring organic materials of our filtration system.
Copper ppb NA 1.0 No 2018 Old plumbing/erosion of natural deposits positive samples/month:
The number of samples
Dissolved Solids,Total ppm 1,000 103 No 2018 Erosion of natural deposits taken monthly that were
found to be positive
Electrical Conductance pS/cm 1,600 148 No 2018 Erosion of natural deposits positive samples/yr:The
Hardness ppm NA 45 No 2018 Erosion of natural deposits number of positive samples
taken that year
Iron ppb 300 ND No 2018 Erosion of natural deposits %positive samples/
Lead ppb NA 0.1 No 2018 Old plumbing/erosian of natural deposits month: Percentage of
samples taken monthly that
Magnesium ppm NA 2.6 No 2018 Erosion of natural deposits were positive
Manganese ppb 50 1.0 No 2018 Erosion of natural deposits CFU/ml:Colony Forming Units
per milliliter
Odor-Threshold Units 3 ND No 2018 Naturally occurring organic materials NA: Not Applicable
ortho-Phosphate,as P ppm NA 0.04 No 2018 Erosion of natural deposits ND: Not Detected
Phosphorus-Total ppm NA 0.04 No 2018 Erosion of natural deposits NR: Not Required, but
recommended
pH Units NA 7.56 No 2018 Erosion of natural deposits
Potassium ppm NA 1.5 No 2018 Erosion of natural deposits
Radon pCi/L NA 476 No 2018 Erosion of natural deposits
Silver ppb 100 ND No 2018 Erosion of natural deposits
Sulfate ppm 500 3.2 No 2018 Erosion of natural deposits
Temperature-System °F NA 50.0 No 2018
Vanadium ppb NA 3.6 No 2018 Erosion of natural deposits
Zinc ppb 5,000 ND No 2018 Runoff/leaching from natural deposits
ADDITIONAL MONITORING As part of an on-going evaluation UCMR-3 RESULTS UNITS AVERAGE MINIMUM MAXIMUM SAMPLE DATE
program called UCMR-3 (Unregulated Contaminant Monitoring Rule
3), the EPA requires us to monitor some additional contaminants/ Chlorate ppm 0.083 ND 0.440 2/2015
chemicals. Information collected through the monitoring of these Chromium,Total ppb 0.52 ND 1.30 2/2015
contaminants/chemicals will ensure that future decisions on drinking
water standards are based on sound science. Chromium-6 ppb 0.43 0.09 1.10 2/2015
The US EPA uses the UCMR to collect data for contaminants Cobalt ppb ND ND ND 2/2015
suspected to be present in drinking water to help determine if
drinking water standards need to be developed in the future.The Molybdenum ppb 13.8 ND 65 2/2015
District was required to monitor 28 chemical contaminants.The first
round was completed in August 2014. The second and final round Strontium ppb 124 15 330 2/2015
was conducted in February 2015. In the absence of identifiable
industrial sources other than chlorate, these contaminants are Vanadium ppb 3.6 ND 13 2/2015
naturally occurring in our watersheds. Chlorate is a degradation
product of the disinfectant used by STPUD for water disinfection and
is a common contaminant found in water treatment facilities
throughout the nation.
SOCs (Synthetic Organic Compounds) are man-made carbon based SOC RESULTS AVERAGE MINIMUM MAXIMUM SAMPLE DATE
chemicals.They are used as pesticides, defoliants, fuel additives and —
as ingredients in the manfacture of many other compounds. Some of EPA 505-Organochlorine Pesticides/PCBs ND ND ND 11/2018
the more well known ones include PCBs, Atrazine, Florene, Dioxins EPA 515.4-Chlorophenoxy Herbicides ND ND ND 11/2018
and Caffeine. SOC's health effects include damage to the nervous
system and cancer risks. The District last tested for these chemicals in EPA 551.1 -EDB/DBCP/HAN ND ND ND 11/2018
2018.
EPA 525.2-Semivolatiles ND ND 1.3 ppb* 11/2018
EPA 548.1 -Endothall ND ND ND 11/2018
EPA 1613B-2,3,7,8-TCDD_Dioxin ND ND ND 11/2018
EPA 547-Glyphosate ND ND ND 11/2018
EPA 531.2-Aldicarbs ND ND ND 11/2018
EPA 549.2-Diquat and Paraquat ND ND ND 11/2018
EPA 524M-TCP-1,2,3-Trichloropropane ND ND ND 11/2018
*1.3 parts per billion Di(2-Ethylhexyl)phthalate) MCL=6 parts per billion