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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

Golden State Water Company (GSWC) - Norwalk

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.

MORE ABOUT THIS CONTAMINANT

 

96

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20141.31 ppb167ND - 5.50 ppb
20150.525 ppb163ND - 3.30 ppb
2016ND160ND
2017ND160ND
2018ND160ND
2019ND160ND

ppb = parts per billion

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

All test results

Date Lab ID Result
2014-02-042706-802-1100ND
2014-02-042706-800-1120ND
2014-02-042706-801-1205ND
2014-02-042706-803-12353.60 ppb
2014-05-062706-803-13005.50 ppb
2014-05-062706-802-11402.30 ppb
2014-05-062706-801-1240ND
2014-05-062706-800-1150ND
2014-08-052706-803-1220ND
2014-08-052706-802-10552.80 ppb
2014-08-052706-801-1130ND
2014-08-052706-800-1115ND
2014-11-042706-802-11452.20 ppb
2014-11-042706-801-12002.40 ppb
2014-11-042706-803-12502.20 ppb
2014-11-042706-800-1220ND
2015-02-032706-803-1150ND
2015-02-032706-802-1225ND
2015-02-032706-801-1312ND
2015-02-032706-800-1237ND
2015-05-052706-803-1121ND
2015-05-052706-802-1235ND
2015-05-052706-800-1245ND
2015-05-052706-801-1303ND
2015-08-040007-800-1312ND
2015-08-040007-803-1235ND
2015-08-040007-802-1249ND
2015-08-040007-801-1330ND
2015-11-102706-801-10303.30 ppb
2015-11-102706-800-10252.90 ppb
2015-11-102706-803-1157ND
2015-11-102706-802-10202.20 ppb
2016-02-032706-801-0951ND
2016-02-032706-800-0945ND
2016-02-032706-803-0910ND
2016-02-032706-802-0930ND
2016-05-032706-801-1249ND
2016-05-032706-800-1258ND
2016-05-032706-803-1235ND
2016-05-032706-802-1048ND
2016-08-022706-803-0925ND
2016-08-022706-801-1025ND
2016-08-022706-800-0957ND
2016-08-022706-802-1000ND
2016-11-082706-803-1155ND
2016-11-082706-801-1247ND
2016-11-082706-802-1220ND
2016-11-082706-800-1230ND
2017-02-089590-802-1212ND
2017-02-089590-803-1148ND
2017-02-089590-801-1231ND
2017-02-089590-800-1246ND
2017-05-029590-802-1141ND
2017-05-029590-800-1151ND
2017-05-029590-801-1208ND
2017-05-029590-803-1119ND
2017-08-019590-800-1307ND
2017-08-019590-801-1321ND
2017-08-019590-803-1225ND
2017-08-019590-802-1258ND
2017-11-079590-803-1218ND
2017-11-079590-800-1305ND
2017-11-079590-802-1252ND
2017-11-079590-801-1316ND
2018-02-069590-803-1127ND
2018-02-069590-800-1259ND
2018-02-069590-801-1312ND
2018-02-069590-802-1245ND
2018-05-019590-801-1258ND
2018-05-019590-802-1212ND
2018-05-019590-803-1051ND
2018-05-019590-800-1237ND
2018-08-079590-801-1256ND
2018-08-079590-803-1156ND
2018-08-079590-802-1222ND
2018-08-079590-800-1230ND
2018-11-069590-801-1234ND
2018-11-069590-803-1141ND
2018-11-069590-802-1208ND
2018-11-069590-800-1217ND
2019-02-059590-800-1220ND
2019-02-059590-802-1203ND
2019-02-059590-801-1238ND
2019-02-059590-803-1150ND
2019-05-079590-800-1235ND
2019-05-079590-802-1215ND
2019-05-079590-803-1150ND
2019-05-079590-801-1257ND
2019-08-069590-803-1141ND
2019-08-069590-802-1209ND
2019-08-069590-800-1220ND
2019-08-069590-801-1241ND
2019-11-059590-803-1211ND
2019-11-059590-802-1236ND
2019-11-059590-800-1250ND
2019-11-059590-801-1310ND