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Chloromethane

Status: No national drinking water standard exists

 

Chloromethane is an industrial solvent, aerosol propellant and a refrigerant. It also forms as a byproduct of water disinfection. The EPA classifies chloromethane as possibly carcinogenic to humans.

2010-2015:

FOUND
FOUND ABOVE HEALTH GUIDELINES

40

states detected

1,166

utilities detected

19 million

people served

15

states over health guideline

54

utilities over health guideline

94,759

people served over health guideline

Health concerns for chloromethane

Cancer

State and national drinking water standards and health guidelines

Health Guideline 2.69 ppb

The health guideline of 2.69 ppb for chloromethane was defined by the Environmental Protection Agency as a benchmark for testing under the Unregulated Contaminant Monitoring Rule program. This health guideline protects against cancer.

ppb = parts per billion.

States reporting chloromethane in drinking water

UTILITIES REPORTING ABOVE HEALTH GUIDELINES UTILITIES WITH CONTAMINATION
State UtilitiesPeople Served UtilitiesPeople Served
Texas913,0532334,955,222
California2705823,182,755
Maryland61,788912,372,460
Florida00261,325,285
Georgia0087973,399
Massachusetts0037601,952
Wisconsin21,35378536,255
Illinois0020491,090
New York42,14782473,378
Utah1766428,427
Missouri520,02314366,614
Alabama232,23534359,480
Delaware0013350,195
Indiana1112,40760279,290
Nebraska004277,149
Connecticut126538259,394
North Carolina0033208,902
Tennessee005184,084
Louisiana0019177,736
New Jersey0014156,475
Washington15328156,251
Mississippi0011138,686
Ohio31652292,691
South Carolina00876,712
Kentucky00449,579
Arkansas002836,182
Oregon00426,905
Pennsylvania00725,713
Minnesota21,729621,464
Virginia00713,930
Vermont001011,843
Colorado1601110,312
Iowa48,70099,410
Wyoming0095,763
Montana0095,729
Michigan0044,439
Nevada0043,833
West Virginia0021,675
New Hampshire0061,201
Maine00188
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Utilities with the highest amounts of chloromethane, 2010-2015

ALL UTILITIES
LARGE UTILITIES
UtilityLocationTestsAverage levelPeople served
Naval Support Facility, DahlgrenDahlgren, VA1 of 10.500 ppb7,872
Tangipahoa (second Ward) Water DistrictNatalbany, LA0 of 1ND4,112
Port Vincent Water System*Port Vincent, LA of 0ND0
Creekside Mobile Home ParkShelbyville, IN1 of 1123.5 ppb75
Russellville Water WorksRussellville, IN1 of 167.6 ppb380
StoverStover, MO1 of 351.7 ppb1,623
Dublin Municipal Water WorksDublin, IN1 of 120.0 ppb790
Beechwood Mobile Home ParkMichigan City, IN1 of 214.0 ppb63
Truesdale Lake P.o.a.South Salem, NY1 of 213.29 ppb625
Blue River Estates Mobile Home ParkIndianapolis, IN1 of 19.60 ppb99
City of GiddingsGiddings, TX8 of 87.99 ppb8,625
Wooden Shoe Water CompanyPeoa, UT1 of 17.30 ppb76
Town of KitzmillerMountain Lake Park, MD2 of 27.05 ppb370
Lake Livingston BranchwoodLivingston, TX1 of 27.00 ppb59
Town of WillardsWillards, MD3 of 36.13 ppb940
Deer CreekDeer Creek, MN1 of 26.00 ppb322
Franklin County Water Association*Brookville, IN1 of 25.95 ppb9,018
Glen At State Line Mobile Home Park 1 Public Water SystemWest Palm Beach, OH1 of 15.94 ppb25
J & R Mobile Home ParkBastrop, TX2 of 25.30 ppb30
City of Florence*Florence, TX7 of 85.05 ppb1,779
Havenshire Water SystemSpring, TX1 of 14.80 ppb63
Woodberry Mobile Home ParkLaporte, IN1 of 24.50 ppb99
Galveston County Water Control and Improvement District 19Hitchcock, TX1 of 14.40 ppb564
Willowside Mutual Water CompanyFulton, CA1 of 24.10 ppb350
Alpine Manor Home For AdultsLima, NY2 of 23.85 ppb36
Calhoun County Water and Fire Protection Authority*Alexandria, AL1 of 273.81 ppb30,810
BagleyBagley, MN1 of 13.70 ppb1,407
Sunrise Trailer ParkMontrose, CO1 of 13.70 ppb60
GormanMountain Lake Park, MD1 of 13.60 ppb150
Sawkill Trailer ParkHyde Park, NY7 of 163.37 ppb186

* This water utility supplies finished drinking water to at least one other water utility. The purchasing utility is not required to test for or report Chloromethane, but it likely has the contaminant in its water supply.

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UtilityLocationTestsAverage levelPeople served
Calhoun County Water and Fire Protection Authority*Alexandria, AL1 of 273.81 ppb30,810
Layton City Water SystemLayton, UT1 of 102.26 ppb74,660
Greensburg Municipal Water Works*Greensburg, IN1 of 81.25 ppb12,000
Wakefield Water DepartmentWakefield, MA1 of 51.20 ppb24,932
City of Newberg*Newberg, OR1 of 21.10 ppb26,500
Golden State Water Company (GSWC) - SouthwestGardena, CA6 of 240.978 ppb271,677
South ElginSouth Elgin, IL3 of 130.960 ppb14,668
New Design - Frederick CountyFrederick, MD4 of 190.684 ppb46,769
Olivehurst Public UDOlivehurst, CA3 of 230.500 ppb13,738
Sikeston*Sikeston, MO1 of 1000.469 ppb16,393
City of GreenvilleGreenville, MS15 of 180.464 ppb34,400
Saratoga Springs City*Saratoga Springs, NY14 of 410.441 ppb35,900
City of Orange*Orange, TX5 of 80.446 ppb18,922
NAWA*Tipp City, OH1 of 90.441 ppb24,766
City of PleasantonPleasanton, TX2 of 210.431 ppb12,935
New Brunswick Water Department*New Brunswick, NJ0 of 4ND55,000
City of TomballTomball, TX1 of 90.378 ppb10,000
City of Alvin*Alvin, TX6 of 160.350 ppb24,000
Jackson County Water Utility*Brownstown, IN1 of 40.350 ppb12,298
Town of Ocean CityOcean City, MD4 of 60.347 ppb30,000
West Monroe Water SystemWest Monroe, LA6 of 200.324 ppb15,930
City of Plant City Utility*Plant City, FL6 of 80.333 ppb35,850
Crystal LakeCrystal Lake, IL2 of 80.318 ppb40,634
City of Pasadena*Pasadena, TX4 of 420.312 ppb110,058
North Peninsula*Poulsbo, WA3 of 170.282 ppb12,437
Aqua Illinois - KankakeeKankakee, IL1 of 40.275 ppb76,299
Elgin*Elgin, IL2 of 40.275 ppb98,500
City of San JacintoSan Jacinto, CA1 of 200.265 ppb14,435
Martinsville Water UtilityMartinsville, IN5 of 250.248 ppb15,000
Orange County Utilities Department (OCUD) - West*Orlando, FL4 of 80.235 ppb157,609

* This water utility supplies finished drinking water to at least one other water utility. The purchasing utility is not required to test for or report Chloromethane, but it likely has the contaminant in its water supply.

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