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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

Marin Municipal Water District

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

 

232

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
20140.200 ppb383ND - 2.70 ppb
20150.550 ppb429ND - 3.50 ppb
20160.443 ppb428ND - 3.70 ppb
2017ND400ND
20180.0611 ppb361ND - 2.20 ppb
20190.218 ppb343ND - 2.70 ppb

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
2014-02-107747-004-1205ND
2014-02-107747-005-0740ND
2014-02-107747-011-1110ND
2014-02-107747-016-1145ND
2014-02-107747-025-1050ND
2014-02-107747-028-0945ND
2014-02-107747-029-0945ND
2014-02-107747-030-1255ND
2014-02-107747-032-0820ND
2014-02-107747-034-0840ND
2014-05-127747-004-1420ND
2014-05-127747-005-0755ND
2014-05-127747-011-1145ND
2014-05-127747-016-1420ND
2014-05-127747-025-0800ND
2014-05-127747-028-1000ND
2014-05-127747-029-1105ND
2014-05-127747-030-0855ND
2014-05-127747-032-0950ND
2014-05-127747-034-0955ND
2014-08-117747-004-1050ND
2014-08-117747-011-09152.50 ppb
2014-08-117747-016-0835ND
2014-08-117747-025-1150ND
2014-08-117747-028-1015ND
2014-08-117747-029-10002.40 ppb
2014-08-117747-030-1220ND
2014-08-117747-032-1150ND
2014-08-117747-034-1340ND
2014-11-101610-004-1125ND
2014-11-101610-004-1210ND
2014-11-101610-005-0820ND
2014-11-101610-016-1155ND
2014-11-101610-025-1010ND
2014-11-101610-028-11002.70 ppb
2014-11-101610-029-1045ND
2014-11-101610-030-1305ND
2014-11-101610-034-0915ND
2015-02-097747-004-1350ND
2015-02-097747-005-0750ND
2015-02-097747-011-1225ND
2015-02-097747-016-1405ND
2015-02-097747-025-0745ND
2015-02-097747-028-0910ND
2015-02-097747-029-1135ND
2015-02-097747-030-0920ND
2015-02-097747-032-1015ND
2015-02-097747-034-1055ND
2015-05-117747-004-08502.20 ppb
2015-05-117747-005-0800ND
2015-05-117747-011-11353.40 ppb
2015-05-117747-016-1350ND
2015-05-117747-025-08002.30 ppb
2015-05-117747-028-0950ND
2015-05-117747-029-10403.50 ppb
2015-05-117747-030-1315ND
2015-05-117747-032-1310ND
2015-05-117747-034-1035ND
2015-05-267747-004-0820ND
2015-05-267747-011-10252.10 ppb
2015-08-107747-004-1015ND
2015-08-107747-005-06502.40 ppb
2015-08-107747-011-1305ND
2015-08-107747-016-0900ND
2015-08-107747-025-1035ND
2015-08-107747-028-1145ND
2015-08-107747-029-1200ND
2015-08-107747-030-0820ND
2015-08-107747-032-0900ND
2015-08-107747-034-0845ND
2015-11-107747-004-1050ND
2015-11-107747-005-1230ND
2015-11-107747-011-09202.40 ppb
2015-11-107747-016-1443ND
2015-11-107747-025-0845ND
2015-11-107747-028-0930ND
2015-11-107747-029-10152.40 ppb
2015-11-107747-030-08352.40 ppb
2015-11-107747-032-1145ND
2015-11-107747-034-1130ND
2016-02-107747-004-0950ND
2016-02-107747-005-1015ND
2016-02-107747-011-1140ND
2016-02-107747-016-0920ND
2016-02-107747-025-0830ND
2016-02-107747-028-0750ND
2016-02-107747-029-1050ND
2016-02-107747-030-0750ND
2016-02-107747-032-0845ND
2016-02-107747-034-1100ND
2016-05-097747-004-1310ND
2016-05-097747-005-0910ND
2016-05-097747-011-10552.00 ppb
2016-05-097747-016-0835ND
2016-05-097747-025-0730ND
2016-05-097747-028-0835ND
2016-05-097747-029-10152.40 ppb
2016-05-097747-030-08202.20 ppb
2016-05-097747-032-0915ND
2016-05-097747-034-1010ND
2016-05-167747-011-00013.70 ppb
2016-05-207747-004-09302.10 ppb
2016-08-087747-004-1335ND
2016-08-087747-005-0720ND
2016-08-087747-011-1155ND
2016-08-087747-016-1250ND
2016-08-087747-025-1155ND
2016-08-087747-028-1125ND
2016-08-087747-029-1120ND
2016-08-087747-030-1015ND
2016-08-087747-032-1035ND
2016-08-087747-034-0925ND
2016-11-147747-004-0950ND
2016-11-147747-005-0745ND
2016-11-147747-011-11052.00 ppb
2016-11-147747-016-1400ND
2016-11-147747-025-0800ND
2016-11-147747-028-0920ND
2016-11-147747-029-12302.20 ppb
2016-11-147747-030-13352.00 ppb
2016-11-147747-032-1315ND
2016-11-147747-034-0945ND
2017-02-137747-004-1200ND
2017-02-137747-005-1005ND
2017-02-137747-011-0950ND
2017-02-137747-016-0915ND
2017-02-137747-025-0745ND
2017-02-137747-028-0825ND
2017-02-137747-029-0905ND
2017-02-137747-030-0800ND
2017-02-137747-032-1310ND
2017-02-137747-034-1150ND
2017-05-081610-004-1050ND
2017-05-081610-005-0720ND
2017-05-081610-011-1225ND
2017-05-081610-016-1255ND
2017-05-081610-025-1355ND
2017-05-081610-028-1330ND
2017-05-081610-029-1140ND
2017-05-081610-030-0900ND
2017-05-081610-032-0935ND
2017-05-081610-034-0900ND
2017-06-191644-005-1000ND
2017-06-191644-011-1045ND
2017-06-191644-013-0820ND
2017-06-191644-014-0920ND
2017-06-191644-015-0830ND
2017-06-191644-016-0945ND
2017-06-191644-017-1225ND
2017-06-191644-018-1410ND
2017-06-191644-025-0905ND
2017-06-191644-034-1150ND
2017-11-137747-004-1100ND
2017-11-137747-005-0720ND
2017-11-137747-011-1100ND
2017-11-137747-016-1340ND
2017-11-137747-025-0800ND
2017-11-137747-028-0930ND
2017-11-137747-029-1150ND
2017-11-137747-030-0850ND
2017-11-137747-032-0815ND
2017-11-137747-034-0930ND
2018-04-119590-004-0830ND
2018-04-119590-016-1315ND
2018-04-119590-025-0745ND
2018-04-119590-028-0820ND
2018-04-119590-029-0745ND
2018-04-119590-030-0950ND
2018-04-119590-032-0920ND
2018-04-119590-034-1150ND
2018-05-149590-004-1115ND
2018-05-149590-016-1355ND
2018-05-149590-025-1045ND
2018-05-149590-028-0935ND
2018-05-149590-029-09402.20 ppb
2018-05-149590-030-0900ND
2018-05-149590-032-1300ND
2018-05-149590-034-0815ND
2018-08-137747-004-1045ND
2018-08-137747-005-0830ND
2018-08-137747-011-1310ND
2018-08-137747-016-1350ND
2018-08-137747-025-0915ND
2018-08-137747-028-1030ND
2018-08-137747-029-1215ND
2018-08-137747-030-0900ND
2018-08-137747-032-0930ND
2018-08-137747-034-1000ND
2018-11-137747-004-1000ND
2018-11-137747-005-0730ND
2018-11-137747-011-1200ND
2018-11-137747-016-1100ND
2018-11-137747-025-0730ND
2018-11-137747-028-0850ND
2018-11-137747-029-1245ND
2018-11-137747-030-0920ND
2018-11-137747-032-1015ND
2018-11-137747-034-1145ND
2019-02-197747-004-1025ND
2019-02-197747-016-1320ND
2019-02-197747-025-0750ND
2019-02-197747-028-10002.20 ppb
2019-02-197747-029-0800ND
2019-02-197747-030-0955ND
2019-02-197747-032-0915ND
2019-02-197747-034-0945ND
2019-05-167747-004-1250ND
2019-05-167747-005-0710ND
2019-05-167747-011-1135ND
2019-05-167747-016-1025ND
2019-05-167747-025-1235ND
2019-05-167747-028-1115ND
2019-05-167747-029-1045ND
2019-05-167747-030-0930ND
2019-05-167747-032-0955ND
2019-05-167747-034-0835ND
2019-08-127747-004-1245ND
2019-08-127747-016-1340ND
2019-08-127747-025-1150ND
2019-08-127747-028-12402.70 ppb
2019-08-127747-029-0820ND
2019-08-127747-030-0740ND
2019-08-127747-032-1315ND
2019-08-127747-034-1115ND
2019-11-127747-004-1145ND
2019-11-127747-016-1410ND
2019-11-127747-025-0950ND
2019-11-127747-028-1105ND
2019-11-127747-029-0825ND
2019-11-127747-030-09252.50 ppb
2019-11-127747-032-1315ND
2019-11-127747-034-0915ND