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EWG's Tap Water Database — 2019 UPDATE

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Monochloroacetic acid

Status: No national drinking water standard exists

 

Monochloroacetic acid, one of the group of five haloacetic acids regulated by federal standards, is formed when chlorine or other disinfectants are used to treat drinking water. Haloacetic acids and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.

2015-2017:

FOUND
FOUND ABOVE HEALTH GUIDELINES

45

states detected

8,624

utilities detected

133 million

people served

0

states over health guideline

0

utilities over health guideline

0

people served over health guideline

Health concerns for monochloroacetic acid

Change to fetal growth and development

State and national drinking water standards and health guidelines

EWG Health Guideline 53 ppb

The EWG Health Guideline of 53 ppb for monochloroacetic acid was proposed in 2020 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 system toxicity.

ppb = parts per billion

States reporting monochloroacetic acid in drinking water

UTILITIES WITH CONTAMINATION
State UtilitiesPeople Served
Texas1,50921,269,238
California39218,608,790
New York53415,772,953
Ohio3567,254,107
New Jersey2356,315,288
Georgia1445,806,235
Virginia3665,378,960
Massachusetts1844,916,778
North Carolina3284,775,945
Louisiana5184,035,562
Colorado3863,106,939
Illinois3152,718,588
Washington1222,665,397
Oklahoma4182,610,515
Pennsylvania882,558,295
Missouri792,491,490
Arkansas2122,135,938
Nevada222,045,966
South Carolina751,770,158
Mississippi2941,675,811
Connecticut531,612,639
Iowa3721,516,269
Minnesota851,473,476
Wisconsin2161,466,208
New Mexico1211,415,888
Kansas3401,380,643
West Virginia3011,316,109
Nebraska34795,693
Delaware21674,259
District Of Columbia4664,572
Utah29496,410
Rhode Island20483,979
North Dakota99476,777
Montana100391,466
Alaska61304,056
Vermont36246,700
Wyoming72228,357
New Hampshire38224,485
Maine20109,715
Kentucky472,198
Hawaii855,189
Maryland934,536
Michigan133,816
Alabama118,000
Tennessee11,075
South Dakota1450
MORE
LESS

Filtering technologies that reduce monochloroacetic acid

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Activated Carbon

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Reverse Osmosis

Utilities with the highest amounts of monochloroacetic acid, 2015-2017

ALL UTILITIES
LARGE UTILITIES
UtilityLocationTestsAverage levelPeople served
Severy, City ofSevery, KS11 of 1248.5 ppb241
Peu/hardwood Hts Birch HillMerrimack, NH2 of 235.9 ppb100
Mountain View Water SystemLa Vale, WV1 of 134.8 ppb132
Newburgh Consolidated WD*Newburgh, NY1 of 129.0 ppb26,313
Campbellsport WaterworksCampbellsport, WI3 of 327.0 ppb2,016
Middletown City*Middletown, NY1 of 126.0 ppb30,850
Wawayanda Wd #1Slate Hill, NY1 of 126.0 ppb850
Table Mound ParkDubuque, IA3 of 324.5 ppb455
Country Village Mobile Home EstatesCorpus Christi, TX1 of 123.7 ppb138
Linwood, City ofLinwood, KS9 of 923.4 ppb384
Elmdale, City ofElmdale, KS1 of 122.0 ppb53
City of CalexicoCalexico, CA12 of 2120.8 ppb38,572
Granville Water SupplyGranville, IA4 of 420.1 ppb314
Genoa City WaterworksGenoa City, WI3 of 319.7 ppb2,766
Wildwood Water SystemFairfield, TX1 of 518.7 ppb517
Nottoway Acres SubdivisionRockville, VA1 of 118.6 ppb58
Seeley County Water DistrictSeeley, CA3 of 818.2 ppb1,730
Northfield San District 1Hixton, WI1 of 118.2 ppb50
Genoa WaterworksGenoa, WI1 of 118.2 ppb264
Flint Creek Utility AssociationWiggins, MS1 of 118.0 ppb327
Stone Utility AssociationPerkinston, MS1 of 118.0 ppb2,350
Barnsdall*Barnsdall, OK19 of 2217.7 ppb1,243
Neola Light & WaterNeola, IA1 of 317.1 ppb842
Peu/lamplighter VillageMerrimack, NH1 of 117.1 ppb162
Rewey WaterworksRewey, WI1 of 116.8 ppb290
Garrison Water SupplyTraer, IA2 of 516.4 ppb371
Ramey Water Supply CorporationMineola, TX2 of 316.1 ppb4,515
Yuba WaterworksYuba, WI1 of 116.1 ppb53
Winneconne WaterworksWinneconne, WI2 of 316.1 ppb2,377
Independence WaterworksIndependence, WI3 of 316.0 ppb1,244
Town of Potts CampPotts Camp, MS1 of 116.0 ppb962
Blackjack Development AssociationFalkner, MS1 of 116.0 ppb562
Davis City Water SupplyDavis City, IA3 of 415.9 ppb204
Hospers Municipal Water DepartmentHospers, IA3 of 515.8 ppb706
New Vienna Water SupplyNew Vienna, IA1 of 115.6 ppb407
Woodview SubdivisionChristiansburg, VA1 of 115.6 ppb77
City of Flowood - NorancoFlowood, MS2 of 215.5 ppb4,335
Cassville WaterworksCassville, WI2 of 315.5 ppb1,052
Crotched Mountain MntncMerrimack, NH1 of 515.4 ppb115
Cactus Avenue Mobile Home ParkAmarillo, TX1 of 115.0 ppb25
Heber Public Utility DistrictHeber, CA15 of 2414.8 ppb6,180
Bayard Water SupplyBayard, IA2 of 214.7 ppb471
City of SundownSundown, TX2 of 314.6 ppb1,397
Aledo Mobile Home ParkDenver, TX1 of 114.6 ppb423
Edgar WaterworksEdgar, WI3 of 314.6 ppb1,491
Jim Thorpe Borough Water WestJim Thorpe, PA1 of 214.5 ppb2,274
Dearing, City of*Dearing, KS3 of 414.4 ppb408
Montgomery County Rural Water District 2c BLiberty, KS3 of 414.4 ppb410
Fall Creek WaterworksFall Creek, WI3 of 314.3 ppb1,322
Neillsville WaterworksNeillsville, WI3 of 314.2 ppb2,761

* 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 Monochloroacetic acid, but it likely has the contaminant in its water supply.

UtilityLocationTestsAverage levelPeople served
Newburgh Consolidated WD*Newburgh, NY1 of 129.0 ppb26,313
Middletown City*Middletown, NY1 of 126.0 ppb30,850
City of CalexicoCalexico, CA12 of 2120.8 ppb38,572
City of BrawleyBrawley, CA13 of 2214.1 ppb51,793
Onalaska WaterworksOnalaska, WI6 of 613.6 ppb18,000
City of BlytheBlythe, CA15 of 4811.7 ppb12,155
City of BrandonBrandon, MS4 of 410.8 ppb27,582
La Crosse WaterworksLa Crosse, WI5 of 68.09 ppb53,000
Rainbow Municipal WDFallbrook, CA21 of 446.83 ppb19,611
City of OxfordOxford, MS4 of 46.50 ppb25,000
Culkin Water DistrictVicksburg, MS37 of 446.48 ppb11,238
Poweshiek Water Association*Tama, IA29 of 485.95 ppb18,836
City of Horn LakeHorn Lake, MS4 of 55.60 ppb13,625
City of MeridianMeridian, MS4 of 55.60 ppb41,148
Eastern Municipal Water District*Perris, CA77 of 2025.48 ppb512,711
Ottumwa Water Works*Ottumwa, IA41 of 485.45 ppb25,023
La Verne WDLa Verne, CA18 of 445.39 ppb32,230
City of Newport*Newport, RI4 of 44.90 ppb42,000
Portsmouth Water & Fire DistrictPortsmouth, RI8 of 84.74 ppb16,864
Gahanna City PWSGahanna, OH48 of 484.64 ppb33,323
Madison County Regional Water*Rogers, AR3 of 34.27 ppb16,412
City of West Point*West Point, MS3 of 44.25 ppb15,062
City of HattiesburgHattiesburg, MS4 of 44.25 ppb46,000
City of GrenadaGrenada, MS4 of 54.00 ppb12,761
Regional Water Authority*New Haven, CT90 of 963.96 ppb418,900
City of GulfportGulfport, MS3 of 43.75 ppb72,076
Spring Lake Water DepartmentSpring Lake, NJ19 of 243.74 ppb11,270
Havelock Water System*Havelock, NC6 of 63.73 ppb14,246
City of TupeloTupelo, MS15 of 443.73 ppb38,842
Rockaway Twp Water DepartmentRockaway, NJ6 of 483.62 ppb14,000
Bangor Water District*Bangor, ME47 of 483.58 ppb25,855
Columbus Public Water System*Columbus, OH186 of 1923.56 ppb1,159,817
Mt Werner WD*Steamboat Springs, CO19 of 223.52 ppb16,980
City of BrookhavenBrookhaven, MS2 of 43.50 ppb12,513
Corning CityCorning, NY6 of 63.50 ppb10,332
City of Moss Point*Moss Point, MS3 of 43.50 ppb17,136
Pella Water Works DepartmentPella, IA38 of 483.49 ppb10,352
Lacey Twp MUAForked River, NJ39 of 483.46 ppb26,240
City of HerefordHereford, TX28 of 483.45 ppb15,370
Beaver Dam Water UtilityBeaver Dam, WI20 of 243.43 ppb16,200
Reynoldsburg City PWSReynoldsburg, OH46 of 483.42 ppb35,893
Horn Lake Water AssociationHorn Lake, MS3 of 53.40 ppb12,542
East Jefferson Waterworks District 1Jefferson, LA852 of 8643.40 ppb243,782
Western Municipal Water District*Riverside, CA22 of 893.36 ppb50,823
Temescal Valley Water DistrictCorona, CA22 of 893.36 ppb13,168
Burlington Municipal Waterworks*Burlington, IA37 of 483.33 ppb25,619
West Carteret Water CorpNewport, NC6 of 63.30 ppb13,600
St Bernard Parish WaterworksChalmette, LA60 of 963.25 ppb44,000
City of HernandoHernando, MS3 of 53.20 ppb12,490
City of McCombMccomb, MS3 of 53.20 ppb16,925

* 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 Monochloroacetic acid, but it likely has the contaminant in its water supply.