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EWG's Tap Water Database — 2019 UPDATE

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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.

2012-2017:

FOUND
FOUND ABOVE HEALTH GUIDELINES

41

states detected

1,147

utilities detected

19 million

people served

17

states over health guideline

63

utilities over health guideline

91,448

people served over health guideline

Health concerns for chloromethane

Cancer

State and national drinking water standards and health guidelines

EWG Health Guideline 2.69 ppb

The EWG 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
Texas1012,3282314,983,050
California1290863,340,577
Maryland86,309821,991,681
Florida00261,325,285
Georgia0074976,447
Alabama0026757,452
New York588771636,812
Wisconsin1703133571,280
Massachusetts13,05837505,208
Illinois0025495,113
Utah27,1878466,432
Missouri415,12311353,643
Nebraska008327,798
Connecticut126543318,033
Indiana1012,56250274,410
Washington120047196,858
Louisiana611,62722165,886
North Carolina0012164,768
Mississippi0011132,033
Ohio31651883,503
New Jersey00982,236
Tennessee00280,665
South Carolina00671,251
Delaware001156,357
Kentucky00449,579
Arkansas002836,770
Oregon00526,935
Pennsylvania00525,225
Minnesota32,405824,785
Virginia17,87229,872
Iowa58,77599,624
Colorado0089,472
Vermont0058,138
Nevada0027,948
Wyoming00116,054
Michigan0033,853
Kansas11,69211,692
Montana003767
West Virginia001737
New Hampshire002725
Maine00188
MORE
LESS

Filtering technologies that reduce chloromethane

carbon filter icon

Activated Carbon

reverse osmosis icon

Reverse Osmosis

Utilities with the highest amounts of chloromethane, 2012-2017

ALL UTILITIES
LARGE UTILITIES
UtilityLocationTestsAverage levelPeople served
Stover PWSStover, MO1 of 1155.0 ppb1,623
Sawkill Trailer ParkHyde Park, NY9 of 1764.1 ppb186
Truesdale Lake P.o.a.South Salem, NY1 of 234.5 ppb400
Deer CreekDeer Creek, MN1 of 112.0 ppb322
Lake Livingston BranchwoodLivingston, TX2 of 38.67 ppb55
City of Giddings*Giddings, TX5 of 67.47 ppb5,064
Westwood Villa ApartmentsBlanco, TX5 of 67.47 ppb66
Cherry Blossom Est Mobile Home ParkNapavine, WA6 of 65.62 ppb200
Callayomi County Water DistrictMiddletown, CA1 of 15.20 ppb2,824
Huttig WaterworksHuttig, AR1 of 45.20 ppb777
Town of PittsvillePittsville, MD1 of 14.20 ppb1,200
SebekaSebeka, MN1 of 14.20 ppb676
Douglass, City ofDouglass, KS2 of 54.08 ppb1,692
Susan Circle Community WsVidor, TX2 of 33.93 ppb37
Stanley Lake Municipal Utility DistrictMontgomery, TX2 of 63.83 ppb3,783
Cascade WaterworksCascade, WI3 of 43.70 ppb703
Bacliff Municipal Utility DistrictBacliff, TX1 of 13.60 ppb7,095
J & R Mobile Home ParkBastrop, TX3 of 33.53 ppb30
City of ShoreacresShoreacres, TX1 of 33.33 ppb1,400
Highland Bayou Estates Water Supply CorporationHitchcock, TX2 of 33.33 ppb42
Williams Water SupplyWilliams, IA12 of 123.12 ppb353
Belchertown Water DistrictBelchertown, MA3 of 33.09 ppb3,058
Greenleaf WaterworksGreenleaf, WI6 of 72.97 ppb650
Alpine Manor Home For AdultsLima, NY3 of 32.90 ppb36
Town of WillardsWillards, MD3 of 32.78 ppb940
Echols County Water AuthorityStatenville, GA12 of 122.76 ppb824
Woodglen Prd Water SystemFreeland, WA2 of 42.57 ppb40
Town of KitzmillerMountain Lake Park, MD1 of 12.50 ppb370
Harris County Water Control and Improvement District 50 El LagoEl Lago, TX1 of 32.50 ppb2,774
Misty Meadows 2 Mobile Home ParkStreet, MD1 of 12.37 ppb70
City of GrandviewGrandview, WA2 of 132.35 ppb10,922
Consolidated Water Supply Corporation Weldon SystemCrockett, TX5 of 52.32 ppb894
Hamilton Water DepartmentHamilton, IN1 of 12.30 ppb2,662
City of Florence*Florence, TX5 of 92.29 ppb1,779
Methuen Water Department*Methuen, MA2 of 32.23 ppb49,660
Town of PerryvillePerryville, MD1 of 12.19 ppb3,672
Villager ApartmentsColden, NY3 of 32.19 ppb40
Crossroads Mfg. Housing CorporationCaledonia, NY4 of 42.18 ppb60
Hubbard Water SupplyHubbard, IA2 of 22.15 ppb845
Commodore Cove Improvement DistrictFreeport, TX2 of 32.07 ppb495
Monroe Township Water & Sewer District PWSTipp City, OH1 of 21.99 ppb97
Miami Co-deer Cliff Run Public Water SystemTroy, OH1 of 21.99 ppb526
NAWA*Tipp City, OH1 of 21.99 ppb24,766
Lake Erie Mobile Home Park LLCFredonia, NY12 of 231.78 ppb320
Palmer Center UgarcKingston, NY8 of 121.76 ppb30
Bayview Municipal Utility DistrictBacliff, TX1 of 41.70 ppb1,830
Benchley Oaks SubdivisionHouston, TX1 of 31.70 ppb480
Norcliffe Water AssociationOak Harbor, WA2 of 21.70 ppb57
Corunna Water UtilityCorunna, IN1 of 11.70 ppb255
City of Nassau BayNassau Bay, TX1 of 31.70 ppb4,002

* 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.

UtilityLocationTestsAverage levelPeople served
City of GrandviewGrandview, WA2 of 132.35 ppb10,922
Methuen Water Department*Methuen, MA2 of 32.23 ppb49,660
NAWA*Tipp City, OH1 of 21.99 ppb24,766
City of Deer Park*Deer Park, TX3 of 81.60 ppb32,964
Galveston County WCID 1Dickinson, TX4 of 121.54 ppb29,280
Wakefield Water Department (MWRA)Wakefield, MA1 of 51.20 ppb24,932
City of Beaumont Water Utility Department*Beaumont, TX2 of 61.17 ppb118,129
City of AlvinAlvin, TX6 of 121.13 ppb24,000
City of Galena ParkGalena Park, TX2 of 111.11 ppb10,089
Wilmington Water DepartmentWilmington, MA6 of 60.737 ppb22,282
City of Pasadena*Pasadena, TX5 of 250.604 ppb110,058
City of CorcoranCorcoran, CA1 of 90.600 ppb24,813
West Springfield Dpw Water DivisionWest Springfield, MA1 of 30.463 ppb28,391
Elgin*Elgin, IL1 of 20.450 ppb98,500
City of Jacinto CityJacinto City, TX1 of 60.417 ppb10,500
City of Baltimore*Baltimore, MD5 of 120.388 ppb1,600,000
North Peninsula*Poulsbo, WA3 of 100.380 ppb12,437
City of OrangeOrange, TX3 of 80.375 ppb19,418
City of GreenvilleGreenville, MS7 of 90.367 ppb31,517
Aqua Illinois - KankakeeKankakee, IL1 of 30.367 ppb76,299
Harris County MUD 55 Heritage ParkHouston, TX1 of 60.333 ppb15,671
City of FriendswoodFriendswood, TX2 of 140.329 ppb37,921
City of La PorteLa Porte, TX3 of 340.309 ppb34,733
Medway Water and Sewer DepartmentMedway, MA2 of 120.283 ppb13,259
Sulphur Water SystemSulphur, LA3 of 40.253 ppb20,632
Lomita Water DepartmentLomita, CA1 of 40.250 ppb20,256
City of LindsayLindsay, CA1 of 40.250 ppb13,445
City of ClermontClermont, FL3 of 60.233 ppb11,265
Northwest Harris County MUD 5*Houston, TX1 of 100.230 ppb16,368
City of League CityLeague City, TX2 of 250.220 ppb104,857
Camas Municipal Water Sewer SystemCamas, WA1 of 90.200 ppb23,020
City of SoledadSoledad, CA2 of 110.173 ppb16,729
City of Roseville*Roseville, CA1 of 50.168 ppb119,000
CTWC - Naugatuck Region-Central SystemClinton, CT1 of 110.155 ppb22,108
Menomonee Falls WW - Surface WaterMenomonee Falls, WI1 of 80.150 ppb23,867
Town of Ocean CityOcean City, MD2 of 40.145 ppb30,000
City of Houston Utility District 5 - Kingwood*Houston, TX1 of 160.144 ppb82,002
Franklin Water DepartmentFranklin, TN1 of 50.140 ppb68,813
City of TulareTulare, CA6 of 430.123 ppb60,823
Carolina Beach Water SystemCarolina Beach, NC3 of 90.122 ppb12,840
Bethany Bay Ocean View*Dover, DE3 of 370.114 ppb34,500
Palm Beach County Water Utilities*West Palm Beach, FL1 of 40.108 ppb529,876
Tewksbury Water DepartmentTewksbury, MA1 of 170.106 ppb29,855
Orange County Utilities Department (OCUD) - SouthOrlando, FL1 of 50.104 ppb91,196
Verona WaterworksVerona, WI4 of 100.0960 ppb10,619
City of LodiLodi, CA9 of 1590.0950 ppb63,395
Sacramento County Water Authority - Laguna/Vineyard*Sacramento, CA5 of 330.0909 ppb148,814
CTWC - Shoreline Region-Guilford SystemClinton, CT5 of 330.0876 ppb33,197
Red Bank Water DepartmentRed Bank, NJ2 of 80.0875 ppb12,520
Dracut Water Supply District*Dracut, MA1 of 100.0800 ppb25,646

* 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.