Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Monochloroacetic acid

Golden State Water Company (GSWC) - Claremont

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

 

100

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20141.91 ppb169ND - 4.80 ppb
20151.32 ppb166ND - 5.10 ppb
20160.519 ppb162ND - 5.70 ppb
2017ND200ND
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
2014-02-122706-802-10202.70 ppb
2014-02-122706-800-1000ND
2014-02-122706-801-0920ND
2014-02-122706-803-0940ND
2014-05-122706-803-1053ND
2014-05-122706-802-1046ND
2014-05-122706-801-13104.50 ppb
2014-05-122706-800-10402.10 ppb
2014-08-132706-803-1101ND
2014-08-132706-802-11083.60 ppb
2014-08-132706-801-13094.80 ppb
2014-08-132706-800-1124ND
2014-11-122706-802-09502.80 ppb
2014-11-122706-801-10153.30 ppb
2014-11-122706-803-09362.90 ppb
2014-11-122706-800-09233.90 ppb
2015-02-092706-803-10455.10 ppb
2015-02-092706-802-10552.90 ppb
2015-02-092706-801-11454.50 ppb
2015-02-092706-800-10354.20 ppb
2015-05-122706-803-1052ND
2015-05-122706-802-1042ND
2015-05-122706-800-1034ND
2015-05-122706-801-1315ND
2015-08-100007-801-1407ND
2015-08-100007-800-1325ND
2015-08-100007-803-1352ND
2015-08-100007-802-1339ND
2015-11-102706-801-1128ND
2015-11-102706-800-10262.10 ppb
2015-11-102706-803-10452.30 ppb
2015-11-102706-802-1035ND
2016-02-082706-801-1114ND
2016-02-082706-800-1007ND
2016-02-082706-803-1031ND
2016-02-082706-802-1126ND
2016-05-102706-801-1315ND
2016-05-102706-800-1035ND
2016-05-102706-803-1052ND
2016-05-102706-802-10442.60 ppb
2016-08-100007-801-1053ND
2016-08-100007-800-0948ND
2016-08-100007-803-1011ND
2016-08-100007-802-1001ND
2016-11-072706-800-1038ND
2016-11-072706-802-1048ND
2016-11-072706-803-1055ND
2016-11-072706-801-13225.70 ppb
2017-02-149590-801-0854ND
2017-02-149590-800-0926ND
2017-02-149590-802-1010ND
2017-02-149590-803-1027ND
2017-05-099590-803-1450ND
2017-05-099590-800-1128ND
2017-05-099590-801-1418ND
2017-05-099590-802-1439ND
2017-08-089590-803-1415ND
2017-08-089590-801-1326ND
2017-08-089590-800-1345ND
2017-08-089590-802-1400ND
2017-10-099590-803-1350ND
2017-10-099590-800-1042ND
2017-10-099590-802-1340ND
2017-10-099590-801-1327ND
2017-11-139590-802-1329ND
2017-11-139590-803-1341ND
2017-11-139590-800-1120ND
2017-11-139590-801-1140ND
2018-03-069590-802-1025ND
2018-03-069590-803-1045ND
2018-03-069590-800-1010ND
2018-03-069590-801-0945ND
2018-05-089590-803-1050ND
2018-05-089590-800-1015ND
2018-05-089590-801-1330ND
2018-05-089590-802-1030ND
2018-08-149590-802-1142ND
2018-08-149590-803-1123ND
2018-08-149590-801-1012ND
2018-08-149590-800-1316ND
2018-11-139590-803-1001ND
2018-11-139590-802-1024ND
2018-11-139590-801-0743ND
2018-11-139590-800-1043ND
2019-02-119590-803-1112ND
2019-02-119590-800-1315ND
2019-02-119590-801-1008ND
2019-02-119590-802-1127ND
2019-05-139590-800-1240ND
2019-05-139590-802-1102ND
2019-05-139590-803-1043ND
2019-05-139590-801-1230ND
2019-08-129590-802-1235ND
2019-08-129590-800-1110ND
2019-08-129590-803-1218ND
2019-08-129590-801-1255ND
2019-11-139590-801-0830ND
2019-11-139590-800-0925ND
2019-11-139590-803-0845ND
2019-11-159590-802-0845ND