2018 Water Quality Report

Transcript

1 2018 Water Quality Report REPORTE DE CALIDAD DE AGUA

2 Completed in 1959, Williams Fork Dam & Power Plant sends water and electricity to the West Slope when Denver diverts water to the city. The dam backs up a reservoir that can store nearly 97,000 acre-feet of water. WHAT IS THIS REPORT? The U.S. Environmental Protection Agency requires public water suppliers reservoirs at Strontia Springs, Marston that serve the same people year-round (community water systems) to provide and Ralston. The potential sources of consumer confidence reports to their customers. These reports are also contamination that may exist are: EPA known as annual water quality reports. This report summarizes information Areas of Concern; Permitted Wastewater regarding water sources used, any detected contaminants, compliance and Discharge Sites; Aboveground, Under - educational information. ground and Leaking Storage Tank Sites; Solid Waste Sites; Existing/Abandoned Where does your water come from? Mile Canyon, Cheesman, Dillon and Gross. Mine Sites; other Facilities; Commercial/ Denver’s drinking water comes from From these reservoirs, the water is then Industrial/Transportation; Residential, rivers, lakes, streams, reservoirs and sent to one of three treatment plants in Urban Recreational Grasses; Quarries/ springs fed by high-quality mountain the city through a complex system of Strip Mines/Gravel Pits; Agriculture; snow runoff. Denver Water’s supply is streams, canals and pipes. Forest; Septic Systems; Oil/Gas Wells and 100 percent surface water that originates After treatment, drinking water is fed Road Miles. For more information on the in sources throughout the watershed by both gravity and pumps to a system report, contact the Colorado Department that encompasses 4,000 square miles on of underground, clear-water reservoirs of Public Health and Environment by both sides of the Continental Divide. before continuing to your home or calling 303-692-2000. business. More than 3,000 miles of pipe Mountain water sources Información importante acerca de la carry water to Denver Water customers. Denver Water’s water sources are the calidad del agua Source water assessment Para recibir la versión en español del South Platte River and its tributaries, the The state health department has com- Reporte de Calidad de Agua de 2018 streams that feed Dillon Reservoir, and pleted a source water assessment of de Denver Water, llame a Servicio al the creeks and canals above the Fraser the potential for contaminants reaching cliente al 303-893-2444 o visite River. Denver Water stores its water in any of Denver Water’s three terminal denverwater.org/CalidadDeAgua. five mountain reservoirs — Antero, Eleven | 2018 Water Quality Report 2

3 THE TREATMENT DENVER WATER’S SYSTEM PROCESS The treatment process Devoted to water quality the state’s population with less than 2 consists of five steps: Denver Water proudly serves high-qual - percent of all the water used in the state. COAGULATION /FLOCCULATION: ity water to 1.4 million people in the The natural environment is our lifeline, Raw water from terminal reser - city of Denver and many surrounding and we help protect it by promoting wise 1 voirs is drawn into mixing basins suburbs. Since 1918, we have expertly water use. at our treatment plants where we add planned, developed and operated a We take our water quality very alum and polymer. This process causes complex system that provides clean, seriously. Last year, we collected more small particles to stick to one another safe, great-tasting water. The utility is than 35,000 samples and conducted forming larger particles. a public agency funded by water rates, more than 68,000 tests to ensure our new tap fees and the sale of hydropower, water is as clean and safe as possible. : Over time, the SEDIMENTATION not taxes. We are Colorado’s oldest and Denver Water vigilantly safeguards now larger particles become largest water utility — Denver Water has our mountain water supplies, and the 2 heavy enough to settle to the a total water service area of more than water is carefully treated before it bottom of a basin from which sediment 360 square miles. reaches your tap. This brochure provides is removed. Denver Water serves 25 percent of data collected throughout 2017. The water is then : FILTRATION filtered through layers of fine, 3 granulated materials — either sand, or sand and coal, depending on the treatment plant. As smaller, sus- pended particles are removed, turbidity diminishes and clear water emerges. : As protection DISINFECTION against any bacteria, viruses 4 and other microbes that might remain, disinfectant is added before the water flows into underground reservoirs throughout the distribution system and into your home or business. Denver Water carefully monitors the amount of disinfectant added to main- tain quality of the water at the farthest reaches of the system. Fluoride occurs Denver Water’s collection system covers about 4,000 square miles and extends into naturally in our water but is also added more than eight counties. to treated water. pH is CORROSION CONTROL: maintained by adding alkaline Denver Water serves 25 percent of the 5 substances to reduce corrosion in the distribution system and the state’s population with less than 2 percent plumbing in your home or business. of all the water used in the state. 2018 Water Quality Report | 3

4 WATER AT A GLANCE All drinking water, including bottled water, may reasonably be expected Water Hotline at 800-426-4791, to contain at least small amounts of some contaminants. The presence of at epa.gov/safewater/lead and at contaminants does not necessarily indicate that the water poses a health denverwater.org/Lead. risk. More information about contaminants and potential health effects can be obtained by calling the Environmental Protection Agency’s Safe Drinking Is There a Presence of and Water Hotline (800-426-4791). Giardia ? Cryptosporidium Denver Water has tested for Crypto- Some people may be more vulnerable sporidium (Crypto) and Giardia in both are at lower risk for lead contamination to contaminants in drinking water than raw and treated water since the 1980s. in the water. the general population. Immuno-com - Since that time, Denver Water has never Lead exposure can cause serious promised persons such as persons detected a viable indication of either in health problems, especially for pregnant with cancer undergoing chemotherapy, the treated drinking water. women and young children. The most persons who have undergone organ and Crypto are microscopic Giardia common sources of lead in drinking transplants, people with HIV-AIDS or organisms that, when ingested, can cause water are materials and components other immune system disorders, some diarrhea, cramps, fever and other gastro- for service lines and home plumbing. elderly, and infants can be particularly and Giardia intestinal symptoms. Crypto Denver Water is responsible for providing at risk of infections. These people should are usually spread through means other high-quality drinking water, but cannot seek advice about drinking water from than drinking water. control the materials used in plumbing their health care providers. EPA/CDC While most people readily recover components. When your water has guidelines on appropriate means to Crypto from the symptoms, Giardia and been sitting for several hours, you can lessen the risk of infection by Cryptospo- can cause more serious illness in minimize the potential for lead exposure ridium and other microbial contaminants people with compromised immune by flushing your tap for up to a couple of are available from the Safe Drinking systems. The organisms are in many minutes before using water for drinking Water Hotline (800-426-4791). of Colorado’s rivers and streams and or cooking. are a result of animal wastes in the If you are concerned about lead, you Lead in Drinking Water watershed. At the treatment plants, may wish to have your water tested. Since 1992, Denver Water has tested Crypto and Denver Water removes Information on lead in drinking water, water inside homes within its distri- through effective filtration, and Giardia testing and steps to minimize exposure bution system considered at risk for Giardia is also killed by disinfection. is available from the Safe Drinking lead and copper contamination, per EPA standards. Denver Water’s source water, water leaving the treatment plants; and water in the distribution system have no detectable lead and trace levels of copper. Lead can get into water through lead-containing household or building plumbing. Softened water is more aggressive toward household plumbing. Homes built before 1951 may have lead service lines, which are the pipes that connect the water main under the street to the home. Homes built before 1987 may have lead solder in their plumbing — lead solder was banned from use on domestic plumbing in 1986. Homes that If you are concerned about lead, Denver Water will test your water for free. do not fall within these two categories | 2018 Water Quality Report 4

5 The Blue River above Dillon Reservoir in Silverthorne is one of many sources of Denver’s drinking water. SOURCES OF DRINKING WATER Microbial contaminants Sources of drinking water include Organic chemical contaminants — substances including synthetic and rivers, lakes, streams, ponds, — viruses, bacteria and other microbes reservoirs, springs, and wells. As that may come from sewage treatment volatile organic chemicals, which are water travels over the surface of by-products of industrial processes and plants, septic systems, agricultural the land or through the ground, livestock operations, and wildlife. petroleum production, and also may come it dissolves naturally occurring from gas stations, urban storm water minerals and, in some cases, Inorganic contaminants runoff, and septic systems. — salts and metals, which can be naturally radioactive material. It can also pick up substances resulting from Radioactive Contaminants occurring or result from urban storm water human activity and the presence of — substances that can be naturally runoff, industrial or domestic wastewater animals. Contaminants may include occurring or be the result of oil and gas discharges, oil and gas production, mining, the following: production, and mining activities. or farming. Pesticides and herbicides — chemical substances resulting from a variety of sources, such as agricultural and urban storm water runoff, and residential uses. 2018 Water Quality Report | 5

6 WATER REGULATED WATER CONTAMINANTS: WHAT IS IN THE WATER? Data collected throughout 2017 QUALITY DATA Regulated leaving the treatment plant Units of Sampling Average Level Detected (Range of All Results) Highest Levels Allowed (MCL) MCLG Sources of Contaminant Violation Frequency Measurement (Entry Point to the Distribution System) Terms, Abbreviations and Erosion of natural deposits, water treatment chemical No 30 (11-50) 50 - 200 (SMCL) N/A ppb Monthly Aluminum Symbols: Some of the terms, Discharge from petroleum refineries, fire retardants, ceramics, electronics, solder 6 ppb 0 (br-0.28) Antimony No Monthly 6 abbreviations and symbols Erosion of natural deposits, runoff from orchards, runoff from glass and electronics, contained in this report are unique Arsenic 10 No 0 (br-1.2) ppb 0 Monthly solder to the water industry and might 0.03 (0.02-0.04) Erosion of natural deposits, discharge of drilling wastes Monthly No Barium 2 2 ppm not be familiar to all customers. Discharge from metal refineries and coal-burning factories; Discharge from electrical, Terms used in the table are 4 0.0 (br-0.06) No Monthly Beryllium ppb 4 aerospace , and defense industries. explained below. Corrosion of galvanized pipes, erosion of natural deposits, discharge from metal No Cadmium ppb 5 5 0.0 (br-0.06) Monthly refineries, runoff from waste batteries and paints. Contaminant: a potentially harmful phys- ical, biological, chemical or radiological Discharge from steel and pulp mills, erosion of natural deposits Monthly No 100 100 ppb Chromium 1 (br - 1.4) substance. 1.0 (SMCL) 0.001 (br-0.02) No Monthly Erosion of natural deposits. Copper ppm 1.3 Maximum Contaminant Level (MCL): Erosion of natural deposits; discharge from refineries and factories; runoff from 2 Mercury ppb 2 Monthly 0 (br) No landfills and croplands Highest level of a contaminant allowed in Discharge from petroleum and metal refineries; Erosion of natural deposits; Discharge drinking water. MCLs are set as close to Selenium ppb 50 50 No 0 (br-7) Monthly from mines. the Maximum Contaminant Level Goal as Erosion of natural deposits; discharge from refineries and factories; runoff from feasible using the best available treatment Thallium 2 (br-0.06) No Monthly ppb 2 landfills and croplands technology. zero 30 0.4 (br-1.2) ppb Monthly Erosion of natural deposits, mine drainage Uranium No Maximum Level Contaminant Goal (MCLG): ppb 200 200 (Regulated as Free CN) 0 (br) No >Annually Discharge from steel/metal factories; Discharge from plastic and fertilizer factories. Cyanide, Total The level of a contaminant in drinking pCi/L Gross Alpha 0 15 0 (br) No Annually Erosion of natural deposits, mine drainage water below which there is no known or mrem/year 4 4 (or 50 pCi/L) 0 (br) No Annually Erosion of natural deposits, mine drainage Beta Emitters expected risk to health. MCLGs allow for a margin of safety. Erosion of natural deposits, mine drainage 0 (br) No Annually 0 Combined Radium (226 and 228) pCi/L 5 Erosion of natural deposits, water additive that promotes strong teeth, discharge from Action Level: Concentration of a contami- ppm 4.0 (2.0 is SMCL) 0.7 (0.13-0.99) No Monthly Fluoride 4.0 fertilizer and aluminum factories nant, that if exceeded, triggers treatment Runof from fertilizer use; Leaching from septic tanks, sewage; Erosion of natural or other requirements that a water system 10 ppm Monthly 10 0.08 (0.02-0.18) Nitrate as N No deposits must follow. Runof from fertilizer use; Leaching from septic tanks, sewage; Erosion of natural 1 ppm Nitrite as N 0 (br) No Monthly 1 deposits Equivalent to milli- Parts Per Million (ppm): No 0 (br-0.1) 70 70 ppb 2,4-D Runoff from herbicide used on row crops Annualy grams per liter. One ppm is comparable to one drop of water in 55 gallons. Highest Turbidity Level for 2017: 0.15 TT ≤0.30 NTU in 95% of NTU N/A Turbidity No Soil runoff > Daily Percentage of Samples <0.3 NTU: 100% samples/month Parts per Billion (ppb): Equivalent to micro- Compliance Description : Denver Water uses grams per liter. One ppb is comparable to enhanced treatment to remove the required amount TT Total Organic Carbon N/A Natural organic matter that is present in the environment No Weekly one drop of water in 55,000 gallons. of natural organic material and/or demonstrates compliance with alternative criteria. Measures PicoCuries per liter (pCi/L): radioactivity. A measure of suspended material Turbidity: Sampling Units of Violation Regulated in the Distribution System Sources of contaminant MCL MCLG Measurement Frequency in water. In the water field, a turbidity measurement (expressed in Nephalometric Total Trihalomethanes (TTHM) Byproduct of drinking water disinfection ppb Monthly N/A 80 Highest locational RAA : 27 (14-33) No Turbidity Units) is used to indicate clarity N/A Monthly ) ppb No 60 Highest locational RAA : 17 (6-21) Byproduct of drinking water disinfection Haloacetic Acids (HAA 5 of water. Highest monthly percentage: 0.24% in July 2017 Absent or No more than 5% positive per Total Coliform zero No Naturally present in the environment Number of postives out of number of samples for Daily Secondary Maximum Contaminant Level Present month the year: 1 out of 4,836 samples or 0.02% (SMCL): Nonenforceable, recommended lim- Lowest monthly percentage of samples meeting TT its for substances that affect the taste, odor, requirement of a detectable (greater than or equal to color or other aesthetic qualities of drinking 0.2 ppm) residual: 99.5% in July 2017. For any two con- TT, (4 mg/L is ppm Drinking water disinfectant used to control microbes No Daily Disinfectant as Total Cl 2 water, rather than posing a health risk. secutive months, at least 95% of samples (per month) MRDL) must have a detectable disinfectant level. Six out 4931 Maximum Residual Disinfectant Level samples had a non-detectable residual in 2017. (MRDL): Highest level of a disinfectant allowed in drinking water. There is convinc- ing evidence the addition of disinfectant Units of Action Level at the 90th No. of Samples exceed- 90th Percentile Value MCLG Regulated at the Customer's Tap Violation Sampling Dates Sources of contaminant is necessary for control of microbial ing Action Level Percentile Measurement contaminants. Copper 1.3 1.3 No 0 (317) January-June Corrosion of household plumbing 0.26 ppm Maximum Residual Disinfectant Level Corrosion of household plumbing 10.3 15 (317) No January-June 15 Lead 0.0 ppb Level of a drinking water Goal (MRDLG): 0 (476) July-December Corrosion of household plumbing ppm Copper 0.26 No 1.3 1.3 disinfectant below which there is no known July-December 0.0 ppb Lead Corrosion of household plumbing 15 No 21 (476) 10 or expected health risk. MRDLGs do not reflect benefit of the use of disinfectants to control microbial contaminants. FOOTNOTES AND DEFINITIONS: Action Level (AL) is the concentration of a contaminant which, if exceeded, triggers treatment or other requirements which a water system Maximum Contaminant Level Goal (MCLG): The level of a contaminant in drinking water below which there is no known or expected risk to health. Turbidity has no known health effects. However, turbidity can interfere with disinfection and provide a medium for microbial growth. must follow. Secondary Maximum Contaminant Levels (SMCL) are non-enforceable recommended limits for substances that affect taste, odor, color or other aesthetic qualities of drinking Nephalometric Turbidity Units (NTU). Note: One entry point sample resulted in 0.1 ppb of 2,4-D. Althought the MCL/MCGL is 70 ppb, Denver Water will be testing for this compound water, rather than posing a health risk. Treatment Technique (TT): A required process intended to reduce the level of a contaminant in drinking water. on a quarterly basis in 2018. “br” means below the reportable level for an analysis; the reportable level is the lowest reliable level that can be measured. Running Annual Average (RAA) Maximum Residual Disinfectant Levels (MRDL). The Fluoride SMCL of 2 mg/L triggers notifying the public of the exceedance. 2018 Water Quality Report | | 2018 Water Quality Report 6 7

7 1600 West 12th Avenue, Denver, CO 80204-3412 303-893-2444 — For more information on water quality, including opportunities denverwater.org. for public participation, visit @Denver_Water @DenverWater facebook.com/DenverWater denverwaterTAP.org youtube.com/YourDenverWater Denver Water’s Public Water System Identification: CO0116001

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