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EWG's Tap Water Database

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Silver Knolls Mutual Water Company

 

EWG's drinking water quality report shows results of tests conducted by the water utility and provided to the Environmental Working Group by the Nevada Division of Environmental Protection, as well as information from the U.S. EPA Enforcement and Compliance History database (ECHO). For the latest quarter assessed by the EPA (July 2018 - September 2018), tap water provided by this water utility was in serious violation federal health-based drinking water standards.

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4

contaminants detected above health guidelines

1

other detected contaminants

    Includes chemicals detected in 2015 for which annual utility averages exceeded the federal Maximum Contaminant Level (MCL); chemicals detected in 2015 for which annual utility averages exceeded an EWG-selected health guideline established by a federal or state public health authority; radiological contaminants detected between 2010 and 2015.

  • Arsenic

    over legal limit

    Arsenic is a potent carcinogen and common contaminant in drinking water. Arsenic causes thousands of cases of cancer each year in the U.S. Click here to read more about arsenic.

    STATE

    NATIONAL

    THIS UTILITY

    How your levels compare

    HEALTH GUIDELINE:
    0.004 ppb
    1.29 ppb
    4.95 ppb
    10.1 ppb
    The State and National averages were calculated using the averages of the contaminant measurements for each utility in 2015.
    ppb = parts per billion.

    Health risks of arsenic in excess of health guideline

    The health guideline of 0.004 ppb for arsenic was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.

    Testing summary by quarter

    NOT TESTED

    NOT DETECTED

    DETECTED

    ABOVE HEALTH GUIDELINE

    ABOVE LEGAL LIMIT

    • Utility Average 2015: 10.1 ppb
    • Health Guideline Exceeded 2015: Yes
    • Legal Limit Exceeded 2015: Yes
    Utility
    Average
    2015
    Health
    Guideline
    Exceeded
    2015
    Legal
    Limit
    Exceeded
    2015
    2010 2011 2012 2013 2014 2015
    10.1 ppb Yes Yes

  • Bromoform

    cancer

    Bromoform, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromoform and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.

    STATE

    NATIONAL

    THIS UTILITY

    How your levels compare

    HEALTH GUIDELINE:
    0.5 ppb
    1.77 ppb
    1.30 ppb
    0.890 ppb
    The State and National averages were calculated using the averages of the contaminant measurements for each utility in 2015.
    ppb = parts per billion.

    Health risks of bromoform in excess of health guideline

    The health guideline of 0.5 ppb for bromoform was proposed in 2018 by the California Office of Environmental Health Hazard Assessment as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.

    Testing summary by quarter

    NOT TESTED

    NOT DETECTED

    DETECTED

    ABOVE HEALTH GUIDELINE

    • Utility Average 2015: 0.890 ppb
    • Health Guideline Exceeded 2015: Yes
    • Legal Limit Exceeded 2015: No
    Utility
    Average
    2015
    Health
    Guideline
    Exceeded
    2015
    Legal
    Limit
    Exceeded
    2015
    2010 2011 2012 2013 2014 2015
    0.890 ppb Yes No

  • Radiological contaminants

    cancer

    This utility detected Uranium.

    Radiological contaminants leach into water from certain minerals and from mining. Drinking water contamination with radioactive substances increases the risk of cancer and may harm fetal development.

  • Total trihalomethanes (TTHMs)

    cancer

    Trihalomethanes are cancer-causing contaminants that form during water treatment with chlorine and other disinfectants. The total trihalomethanes group includes four chemicals: chloroform, bromodichloromethane, dibromochloromethane and bromoform.

    STATE

    NATIONAL

    THIS UTILITY

    How your levels compare

    HEALTH GUIDELINE:
    0.8 ppb
    23.6 ppb
    9.50 ppb
    0.890 ppb
    The State and National averages were calculated using the averages of the contaminant measurements for each utility in 2015.
    ppb = parts per billion.

    Health risks of trihalomethanes in excess of health guideline

    The health guideline of 0.8 ppb for trihalomethanes was defined by the California Office of Environmental Health Hazard Assessment as a draft public health goal, the level of drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.

    Testing summary by quarter

    NOT TESTED

    NOT DETECTED

    DETECTED

    ABOVE HEALTH GUIDELINE

    ABOVE LEGAL LIMIT

    • Utility Average 2015: 0.890 ppb
    • Health Guideline Exceeded 2015: Yes
    • Legal Limit Exceeded 2015: No
    Utility
    Average
    2015
    Health
    Guideline
    Exceeded
    2015
    Legal
    Limit
    Exceeded
    2015
    2010 2011 2012 2013 2014 2015
    0.890 ppb Yes No

    Includes chemicals detected under the EPA's Unregulated Contaminant Monitoring Rule (UCMR 3) program in 2013 to 2015, for which annual utility averages were lower than an EWG-selected health guideline established by a federal or state public health authority.

  • Chromium (total)


    Chromium is a naturally occurring metal, but industrial uses can elevate its levels in water. One form, hexavalent chromium, causes cancer. Total chromium is not a good indicator of the amount of hexavalent chromium in drinking water.

    STATE

    NATIONAL

    THIS UTILITY

    How your levels compare

    0.631 ppb
    0.901 ppb
    3.00 ppb
    The State and National averages were calculated using the averages of the contaminant measurements for each utility in 2010-2015.
    ppb = parts per billion.

    Testing summary by quarter

    NOT TESTED

    NOT DETECTED

    DETECTED

    ABOVE LEGAL LIMIT

    • Utility Average 2010-2015: 3.00 ppb
    • Health Guideline Exceeded 2010-2015: No
    • Legal Limit Exceeded 2010-2015: No
    Utility
    Average
    2010-2015
    Health
    Guideline
    Exceeded
    2010-2015
    Legal
    Limit
    Exceeded
    2010-2015
    2010 2011 2012 2013 2014 2015
    3.00 ppb No No

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Pollution sources

Click on each pollution source to see from which source contaminants come.

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Agriculture

teardrop 1
industry icon

Industry

teardrop 3
water treatment icon

Treatment
byproducts

tear drop 2
urban area icon

Runoff &
sprawl

teardrop 0
naturally occuring icon

Naturally
occuring

teardrop 3

  • Arsenic
  • Arsenic
  • Chromium (total)
  • Uranium
  • Arsenic
  • Chromium (total)
  • Uranium
    • Bromoform
    • Total trihalomethanes (TTHMs)
    Specific water contaminants can come from more than one source.

    Silver Knolls Mutual Water Company compliance with legally mandated federal standards

    • From October 2015 to September 2018, Silver Knolls Mutual Water Company did not comply with health-based drinking water standards.
    • 11 QUARTERS
      in violation of any federal drinking water standard from October 2015 to September 2018
    • Over the last 3 years this water utility has spent
      5 QUARTERS
      in significant violation of federal drinking water standards
    Information in this section on Silver Knolls Mutual Water Company comes from the U.S. EPA Enforcement and Compliance History Online database. Click here for more information for this utility.

    Other contaminants tested


    Contaminants detected between 2010 and 2014 and were not part of EPA's UCMR-3 testing program:

    Barium, Fluoride, Nitrate and nitrite, Nitrate, Nitrite, Selenium, Trichloroethylene

     

    Chemicals tested for but not detected from 2010 to 2015:

    1,1,1,2-Tetrachloroethane, 1,1,1-Trichloroethane, 1,1,2,2-Tetrachloroethane, 1,1,2-Trichloroethane, 1,1-Dichloroethane, 1,1-Dichloroethylene, 1,1-Dichloropropene, 1,2,3-Trichlorobenzene, 1,2,4-Trichlorobenzene, 1,2,4-Trimethylbenzene, 1,2-Dibromo-3-chloropropane (DBCP), 1,2-Dichloroethane, 1,2-Dichloropropane, 1,3,5-Trimethylbenzene, 1,3-Dichloropropane, 2,2-Dichloropropane, 2,4,5-T, 2,4,5-TP (Silvex), 2,4-D, 2,4-DB, 2,4-Dinitrotoluene, 2-Hexanone, 3,5-Dichlorobenzoic acid, 3-Hydroxycarbofuran, Acenaphthylene, Acetone, Acifluorfen (Blazer), Acrylonitrile, Alachlor (Lasso), Aldicarb, Aldicarb sulfone, Aldicarb sulfoxide, Aldrin, Altyl chloride, Aluminum, Anthracene, Antimony, Asbestos, Atrazine, Baygon (Propoxur), Bentazon (Basagran), Benzene, Benzo[a]anthracene, Benzo[a]pyrene, Benzo[b]fluoranthene, Benzo[g,h,i]perylene, Benzo[k]fluoranthene, Beryllium, Bromacil, Bromobenzene, Bromochloroacetic acid, Bromochloromethane, Bromodichloromethane, Bromomethane, Butachlor, Butyl benzyl phthalate, Cadmium, Caffeine, Carbaryl, Carbofuran, Carbon tetrachloride, Chlordane, Chloroethane, Chloroform, Chloromethane, Chrysene, cis-1,2-Dichloroethylene, cis-1,3-Dichloropropene, Cyanide, Dalapon, DCPA mono- and di-acid degradates, Di(2-ethylhexyl) adipate, Di(2-ethylhexyl) phthalate, Di-n-butyl phthalate, Diazinon (Spectracide), Dibenz[a,h]anthracene, Dibromoacetic acid, Dibromochloromethane, Dibromomethane, Dicamba, Dichloroacetic acid, Dichlorodifluoromethane, Dichloromethane (methylene chloride), Dichlorprop, Dieldrin, Diethyl phthalate, Dimethoate, Dimethyl ether, Dimethyl phthalate, Dinoseb, Diquat, Endothall, Endrin, Ethyl methacrylate, Ethylbenzene, Ethylene dibromide, Fluoranthene, Fluorene, gamma-Chlordane, Glyphosate, Haloacetic acids (HAA5), Heptachlor, Heptachlor epoxide, Hexachlorobenzene (HCB), Hexachlorobutadiene, Hexachlorocyclopentadiene, Indeno[1,2,3-cd]pyrene, Iodomethane, Isophorone, Isopropylbenzene, Lindane, m- & p-Xylene, m-Dichlorobenzene, Manganese, Mercury (inorganic), Methacrylonitrile, Methiocarb, Methomyl, Methoxychlor, Methyl ethyl ketone, Methyl isobutyl ketone, Methyl methacrylate, Metolachlor, Metribuzin, Molinate, Monobromoacetic acid, Monochloroacetic acid, Monochlorobenzene (chlorobenzene), MTBE, n-Butylbenzene, n-Propylbenzene, Naphthalene, o-Chlorotoluene, o-Dichlorobenzene, o-Xylene, Oxamyl (Vydate), p-Chlorotoluene, p-Dichlorobenzene, p-Isopropyltoluene, Paraquat, Pentachloroethane, Pentachlorophenol, Phenanthrene, Picloram, Polychlorinated biphenyls (PCBs), Propachlor, Propionitrile, Pyrene, Radium, combined (-226 & -228), Radium-226, Radium-228, sec-Butylbenzene, Silver, Simazine, Styrene, tert-Butylbenzene, Tetrachloroethylene (perchloroethylene), Tetrahydrofuran, Thallium, Thiobencarb, Toluene, Toxaphene, trans-1,2-Dichloroethylene, trans-1,3-Dichloropropene, trans-1,4-Dichloro-2-butene, trans-Nonachlor, Trichloroacetic acid, Trichlorofluoromethane, Trichlorotrifluoroethane, Trifluralin, Vinyl chloride, Xylenes (total)