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HomeMy WebLinkAbout15 Attachment #2 Hirschdale 2020 CCRIn This Document  Water Quality General Information  Source Water Assessment  Where Our Water Comes From  Lead In Drinking Water  Definitions  Sampling Results Este informe contiene información muy importante sobre su agua potable. Tradúzcalo o hable con alguien que lo entienda bien. Customer Views Are Welcome T he Truckee Donner Public Utility District encourages community par- ticipation in the public process. If you are interested in participating in the TDPUD’s decision-making process, you are welcome to attend Board Meetings. The TDPUD 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 meet- ings may be obtained on our website or from the Deputy District Clerk ’s office, (530)582-3980. For More Information:  About this report or the water treatment process, contact Truckee Donner Public Utility District’s Senior Water Quality Technician, Clay Walker at (530)582-3926.  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. Hirschdale Water System PWS# 2910010 For more information about us, please visit our website at www.tdpud.org . Water Quality T ruckee Donner Public Utility District is able to report that it has met all State and Federal drinking water standards. The data in this report is a snapshot of the quality of water provided to TDPUD customers for the 2019 calendar year. This report includes details about your local water sources, annual water quality sampling data, 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 key to the collaborative process in identifying improvements that are neces- sary to maintain the highest drinking water standards. It is important to note, that while the TDPUD strives to meet all State and Federal 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 contami- nants are available from the Safe Drinking Water Hotline at (800)426 -4791 or https://www.epa.gov/ground-water-and-drinking-water/safe-drinking-water-hotline. Lead in Residential Plumbing I f present, elevated levels of lead can cause serious health problems, especially for pregnant women and young children. In circumstances where lead is de- tected in drinking water, it is primarily derived from materials and components associated with service lines and residential plumbing. The 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 a prolonged period of time, 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 2019, 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 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 R ecognizing that our potable water sources are exclusively drawn from a deep groundwater well, the presence of microscopic organisms such as Cryptos- poridium and Giardia in our water is highly unlikely. If ingested, Cryptosporidium and Giardia can cause diarrhea, fever, and other gastrointestinal symptoms. 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 office, located at 11570 Donner Pass Road, Truckee, California, or by calling Clay Walker at (530)582-3926. Substances That May Be Found In Water S ources 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. Drinking water, including bottled water, may contain at least small amounts of some contaminants. The presence of many of these contaminants does not necessarily indicate that water poses a health risk. Examples of contaminants that may be present in source water include: Microbial Contaminants, such as viruses and bacteria, that may come from stormwater or wastewater, septic systems, agricultural livestock opera- tions, and wildlife; Inorganic Contaminants, such as salts and metals, that can be naturally occurring or can result from erosion, urban stormwater runoff, industri- al or domestic wastewater discharges, oil and gas production, mining, or farm- ing; 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 U.S. EPA’s Safe Drinking Water Hotline at (800) 426- 4791. Definitions 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 (MRDLG): 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. Regulatory Action Level (AL): The concentration of a contaminant which, if exceeded, triggers treatment or other requirements that a water system must follow. 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 (µg/L) ppt: parts per trillion or nanograms per liter (ng/L) pCi/L: picocuries per liter (a measure of radiation) (μS/cm): micro Siemens per centimeter (NTU): nephelometric turbidity unit (measures water cloudiness) 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 1 – SAMPLING RESULTS SHOWING THE DETECTION OF COLIFORM BACTERIA Microbiological Contami- nants Highest No. of Detec- tions No. of months in violation MCL MCLG Typical Source of Bacteria Total Coliform Bacteria 0 0 More than 5% of samples in a month with a detec- tion 0 Naturally present in the environment TABLE 2 – DISINFECTION BY-PRODUCTS Contaminant # Samples, Frequency Average Level Range MCL (MRDL) MCLG (MRDLG) Typical Source of Contaminant Chlorine Residual (ppm) 1 per month 0.50 .39-.75 4 4 Drinking water disinfectant added for treatment Total Trihalomethanes (ppb) 1 on 8/19/20 19 N/A 80 N/A By-product of drinking water disinfection Haloacectic Acids (ppb) 1 on 8/19/20 8.4 N/A 60 N/A By-product of drinking water disinfection TABLE 3 – DISTRIBUTION SYSTEM CUSTOMER TAP SAMPLING FOR LEAD AND COPPER Lead and Copper Date Last Sampled No. of samples collected 90th per- centile level de- tected No. sites exceeding AL AL PHG Typical Source of Contaminant Lead (ppb) 08/07/19 5 1 0 15 0.2 Internal corrosion of household water plumbing systems; discharges from industrial manufacturers; erosion of natural deposits Copper (ppm) 08/07/19 5 0.061 0 1.3 0.3 Internal corrosion of household plumbing systems; erosion of natu- ral deposits; leaching from wood preservatives TABLE 4 – SAMPLING RESULTS FOR SODIUM AND HARDNESS Chemical or Constituent (reporting units) Date Last Sampled Level De- tected Range of Detections MCL PHG (MCLG) Typical Source of Contaminant Sodium (ppm) 2019 50 N/A N/A N/A Salt present in the water and is general- ly naturally occurring Hardness (as CaCO3) (ppm) 2019 62 N/A N/A N/A Sum of polyvalent cations present in the water, generally magnesium and calcium, and are usually natu- rally occurring TABLE 5- UNREGULATED COMPOUNDS Chemical or Constituent (reporting units) Date Last Sampled Level Detected Range of Detec- tions MCL PHG (MCLG) Typical Source of Contaminant Alkalinity (as CaCO3) (ppm) 2019 150 N/A N/A N/A Erosion of natural deposits Bicarbonate Alkalinity (as HCO3) (ppm) 2019 180 N/A N/A N/A Leaching of natural deposits Calcium (ppm) 2019 11 N/A N/A N/A Erosion of natural deposits Magnesium (ppm) 2019 8 N/A N/A N/A Erosion of natural deposits Potassium (ppm) 2019 4.8 N/A N/A N/A Erosion of natural deposits TABLE 6 – DETECTION OF CONTAMINANTS WITH A PRIMARY DRINKING WATER STANDARD Chemical or Constituent (reporting units) Date Last Sampled Level Detected Range of Detec- tions MCL PHG (MCLG) Typical Source of Contaminant Inorganic Contaminants Arsenic (ppb) 2019 3.0 N/D-7.0 10 0.004 Erosion of natural deposits Barium (ppm) 2019 56 N/A 1000 2000 Erosion of natural deposits Fluoride (ppm) 2019 0.16 N/A 2 1 Erosion of natural deposits Turbidity (NTU) 2019 3.20 N/A 5 5 Soil runoff Radioactive Contaminants Gross Alpha Particle Activity (pCi/L) 2018 N/D 3 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 DRINKING WATER STANDARD Chemical or Constituent (reporting units) Date Last Sampled Level Detected Range of Detec- tions MCL PHG (MCLG) Typical Source of Contaminant Chloride (ppm) 2019 7 N/A 250 N/A Leaching of natural deposits Iron (ppb) 2019 76 N/A 300 N/A Leaching of natural deposits Manganese (ppb) 2019 8.30 N/A 50 N/A Leaching of natural deposits pH 2019 7.8 7.7 - 8.3 6.5 - 8.5 N/A Erosion of natural deposits Specific Conductance (μS/cm) 2019 340 N/A 1600 N/A Substances that form ions when in water. Sulfate 2019 13 N/A 250 N/A Leaching of natural deposits Total Dissolved Solids (ppm) 2019 220 N/A 500 N/A Leaching of natural deposits FREQUENTLY ASKED QUESTIONS Q. Why does my water smell and taste like chlorine? A. Chlorine is regularly injected into the water at the source as a disinfectant that aids in elimi- nating potentially harmful bacteria present in water. In high demand summer month ’s chlorine taste may be more noticeable because the water is "fresh" or "new" and chlorine has not had time to dissipate through the system. Chlorine can also gas off in warm/hot water which produces a smell stronger than normal. Some peo- ple are more sensitive than others to the taste and smell of chlorine and may become aware of occasional changes. This is normal and safe. Chlorine levels are continually monitored. Q. Why does my water taste like metal? A. The source water is ground water, which has a mineral content that might give off a metal taste some are not used too. Sometimes plumbing can cause a metal taste, especially if water has been sitting in pipes for several hours. It’s best to flush the lines for of couple minutes if water has sat in pipes for an extend- ing period of time, however, this does not indicate a higher or lower degree of water quality. Q. Why is there white crust on my shower head? A. The minerals in water may leave white spots on glasses, coffeepots, shower heads and shower doors. These spots are calcium deposits and are not harmful to health. Q. Why is there a black ring around my toilet? A. This black ring some may find after returning home when water has sat in the bowl for extending period of time is mold. Mold will grow in dark, wet, cool places making the toilet bowl a perfect place for that. If this accrues adding bleach to the bowl and letting it sit works best. To avoid this, leave a small amount of bleach in the bowl before leaving for more than a couple days. Q. What clauses cloudy water? A. Cloudy or milky water is usually caused by trapped air picked up from an air pocket in the water main or internal plumbing. Sometimes flows or water cascading within the aqueduct can also trap air, similar to a waterfall. If water sits in a glass or pitcher for a few minutes the air will dissipate and become clear.