EWG's Tap Water Database — 2021 UPDATE


Dichloromethane (methylene chloride)

Status: National drinking water standard exists


Methylene chloride is a common industrial solvent used for paint stripping, vapor degreasing, printing, electronics manufacturing and cleaning. It causes cancer and liver damage in animal studies. Read More.

Surface and groundwater can be contaminated with methylene chloride from industrial releases and landfill leaching. The EPA considers methylene chloride likely carcinogenic to people. Long-term ingestion of drinking water with methylene chloride contamination can cause liver damage and cancer. Occupational exposure to methylene chloride and other solvents has been linked with increased risk of miscarriage. Birth defects have also been observed in studies of laboratory animals exposed to methylene chloride during pregnancy.

Click here to read more about carcinogenic VOCs.




states detected


utilities detected

5.3 million

people served


states over health guideline


utilities over health guideline


people served over health guideline

Health concerns for dichloromethane (methylene chloride)


Harm to reproduction and child development

Harm to the liver

State and national drinking water standards and health guidelines

EWG Health Guideline 4 ppb

The EWG Health Guideline of 4 ppb for dichloromethane (methylene chloride) 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.

EPA Maximum Contaminant
Level (MCL) 5 ppb

The legal limit for dichloromethane, established in 1992, was based on analytical detection limits at the time that the standard was set.

ppb = parts per billion

States reporting dichloromethane (methylene chloride) in drinking water

State UtilitiesPeople Served UtilitiesPeople Served
New Jersey0010146,924
North Carolina001286,274
North Dakota00380,555
New York004447,526
New Hampshire00114,000
New Mexico002250
South Carolina001153

Filtering technologies that reduce dichloromethane (methylene chloride)

carbon filter icon

Activated Carbon

reverse osmosis icon

Reverse Osmosis

Utilities with the highest amounts of dichloromethane (methylene chloride), 2017-2019

UtilityLocationTestsAverage levelPeople served
Alpine Acres Mutual Water CompanySonora, CA1 of 110.5 ppb59
Sierra Village Mutual Water CompanyTwain Harte, CA3 of 64.81 ppb272
Sierra Twain Harte Mobile Home ParkColumbia, CA1 of 24.20 ppb120
Mi-wuk Heights Mutual Water CompanyMi Wuk Village, CA2 of 43.60 ppb352
Pinecrest Permittees AssociationPinecrest, CA3 of 43.55 ppb2,500
Washington Corrections CenterShelton, WA1 of 53.50 ppb1,800
Grand Chute Tn San District 1Grand Chute, WI5 of 53.49 ppb21,583
Mayfair SubdivisionMorton, IL1 of 42.50 ppb90
Franklin GroveFranklin Grove, IL2 of 142.39 ppb1,021
Chelmsford Water DistrictChelmsford, MA1 of 12.21 ppb28,079
Birchland Mobile Home CommunityHorseheads, NY1 of 31.93 ppb50
Norwalk Wilshire Mobile Home ParkHartford, IA1 of 11.80 ppb216
Dubois, Town OfDubois, WY1 of 21.70 ppb971
Truluck-dogwood Hills SubdivisionCordele, GA1 of 31.70 ppb52
CaberyCabery, IL2 of 51.64 ppb263
Truluck-timberland PlantationCordele, GA1 of 31.57 ppb75
Stuart Water CompanyRancho Santa Fe, CA1 of 51.44 ppb100
Truluck-sunnybrook Farm SDCordele, GA1 of 31.43 ppb83
Sonora Estates Mobile Home ParkSonora, CA1 of 31.38 ppb210
Cal Fire - Miramonte Conservation CampMiramonte, CA1 of 81.38 ppb100
Sjolander Road Mobile Home ParkThe Woodlands, TX1 of 81.38 ppb126
Cedar Lake EstatesCordele, GA1 of 31.37 ppb78
Quimby Water SupplyQuimby, IA1 of 21.35 ppb319
Cold Springs Water CompanyCold Springs, CA1 of 21.33 ppb375
Champion Farms SubdivisionTroy, MO2 of 71.32 ppb30
Truluck-bran-tre SubdivisionCordele, GA1 of 31.30 ppb57
Pueblo Heights Mobile Home ParkGlobe, AZ1 of 71.26 ppb400
Bluff Lake Lodges, Inc.Antioch, IL3 of 181.22 ppb24
Tamarron Mobile Home ParkNewport Beach, CA1 of 11.19 ppb225
MaroaMaroa, IL1 of 41.17 ppb1,700
Sierra Village Mobile Home ParkMi Wuk, CA1 of 21.17 ppb30
Lemars Water DepartmentLemars, IA1 of 21.15 ppb9,846
Oronoko TownshipWalled Lake, MI1 of 61.12 ppb2,310
Berrien Springs*Dearborn Heights, MI1 of 61.12 ppb3,530
Andrews UniversityComstock, MI1 of 61.12 ppb3,000
West Shore Park SubdivisionMundelein, IL1 of 31.10 ppb590
Glenview Mobile ParkOxnard, CA1 of 21.10 ppb100
Ludlow Warner SystemLudlow, PA1 of 11.10 ppb76
Spring Run Estates Water Treatment PlantCoatesville, PA1 of 101.06 ppb450
Nico Tyme Water CoopElmendorf, TX1 of 51.06 ppb96
Backwoods-saddlebrook Community WsMoyock, NC1 of 171.04 ppb122
Rimrock Water AssociationGoldendale, WA2 of 31.02 ppb78
Nicholasville Water Department*Nicholasville, KY1 of 61.000 ppb34,253
Stanford Water Works*Stanford, KY1 of 61.000 ppb9,284
City of San Juan CapistranoSan Juan Capistrano, CA1 of 101.000 ppb40,000
Jessamine County Water District #1Nicholasville, KY1 of 61.000 ppb6,831
Rambling Hills EstatesGuerneville, CA1 of 30.997 ppb78
Rancho Carrillo Mutual Water CompanySan Juan Capistrano, CA3 of 60.955 ppb168
Chester, Town ofChester, MT1 of 100.940 ppb870
Pojoaque Terraces Mobile Home ParkFairview, NM1 of 30.900 ppb160

* 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 Dichloromethane (methylene chloride), but it likely has the contaminant in its water supply.

UtilityLocationTestsAverage levelPeople served
Grand Chute Tn San District 1Grand Chute, WI5 of 53.49 ppb21,583
Chelmsford Water DistrictChelmsford, MA1 of 12.21 ppb28,079
Nicholasville Water Department*Nicholasville, KY1 of 61.000 ppb34,253
City of San Juan CapistranoSan Juan Capistrano, CA1 of 101.000 ppb40,000
City of MartinezMartinez, CA1 of 10.600 ppb35,375
Fort Dodge Water Supply*Fort Dodge, IA1 of 20.550 ppb25,206
Two Rivers WaterworksTwo Rivers, WI5 of 70.513 ppb11,232
Whitefish Bay WaterworksWhitefish Bay, WI1 of 10.480 ppb14,272
Wisconsin Rapids Water Works & Lighting Comm.Wisconsin Rapids, WI1 of 30.433 ppb20,000
Rockingham, City ofRockingham, NC2 of 100.375 ppb13,233
Worcester Department of Public Works*Worcester, MA1 of 60.367 ppb181,045
Marion Waterworks*Marion, AR4 of 280.365 ppb13,014
California Water Service Company - WestlakeSan Jose, CA15 of 730.349 ppb19,451
Thousand Oaks Water DepartmentThousand Oaks, CA15 of 730.349 ppb50,000
Cal American Water CompanyNewbury Park, CA15 of 730.349 ppb61,206
Oak Park Water ServiceVentura, CA15 of 730.349 ppb12,200
Allouez WaterworksGreen Bay, WI2 of 40.308 ppb13,932
Shorewood WaterworksShorewood, WI2 of 20.285 ppb13,189
Marinette WaterworksMarinette, WI5 of 80.238 ppb10,968
Beverly Hills Water DepartmentBeverly Hills, CA4 of 170.212 ppb44,290
Mequon Water UtilityMequon, WI1 of 10.210 ppb11,152
City of San BenitoSan Benito, TX1 of 60.200 ppb24,250
City of Bogalusa Water SystemBogalusa, LA2 of 320.194 ppb14,000
City of Bismarck*Bismarck, ND1 of 60.183 ppb72,417
MooreMoore, OK18 of 1250.168 ppb55,083
Braintree Water and Sewer DepartmentBraintree, MA1 of 40.160 ppb37,544
Johnston Municipal Water SupplyJohnston, IA1 of 120.158 ppb17,306
Waukee Water Supply*Waukee, IA1 of 120.158 ppb13,790
Des Moines Water Works*Des Moines, IA1 of 120.158 ppb233,020
Warren Water District*Indianola, IA1 of 120.158 ppb18,045
Clive Water DepartmentClive, IA1 of 120.158 ppb15,447
Urbandale Water UtilityUrbandale, IA1 of 120.158 ppb39,463
Slidell Water SupplySlidell, LA2 of 160.150 ppb38,612
Del CityDel City, OK7 of 440.150 ppb22,128
City of Shelby*Shelby, NC3 of 190.139 ppb20,323
MontgomeryMontgomery, IL3 of 560.137 ppb28,160
San Gabriel Valley Water Company - FontanaFontana, CA6 of 1450.128 ppb213,209
City of Stuart - Water PlantStuart, FL14 of 2140.128 ppb19,000
Manitowoc Waterworks*Manitowoc, WI2 of 200.123 ppb34,500
Mission Springs WDDesert Hot Springs, CA3 of 230.111 ppb34,626
City of AntiochAntioch, CA1 of 90.111 ppb103,833
Germantown Water DepartmentGermantown, TN1 of 40.110 ppb37,897
Elizabeth CityElizabeth City, NC1 of 100.110 ppb19,187
Galveston County WCID 1Dickinson, TX4 of 210.110 ppb29,280
Brownsville Public Utilities Board*Brownsville, TX1 of 120.108 ppb176,362
City of AmmonAmmon, ID1 of 100.106 ppb14,019
Park WC - ComptonDowney, CA1 of 140.1000 ppb24,698
Elizabethtown Area WaterElizabethtown, PA2 of 280.0964 ppb18,900
Camas Municipal Water Sewer SystemCamas, WA1 of 150.0933 ppb23,020
Denville Twp Water DepartmentDenville, NJ3 of 560.0911 ppb15,881

* 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 Dichloromethane (methylene chloride), but it likely has the contaminant in its water supply.