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EWG's Tap Water Database — 2019 UPDATE

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Monochloroacetic acid

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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.

 

38

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20124.25 ppb442.00 ppb - 8.00 ppb
20131.40 ppb52ND - 4.00 ppb
20141.50 ppb63ND - 3.00 ppb
20151.000 ppb83ND - 3.00 ppb
20165.43 ppb74ND - 14.0 ppb
20172.63 ppb84ND - 8.00 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
2012-02-16120217-015HA8.00 ppb
2012-04-18120419-005HA2.00 ppb
2012-08-13120814-019HA3.00 ppb
2012-11-07121108-002HA4.00 ppb
2013-03-06130307-001HAND
2013-04-29130430-012HA3.00 ppb
2013-07-29130730-007HAND
2013-11-18131119-014HA4.00 ppb
2013-11-18131119-013HAND
2014-02-10140211-007HA3.00 ppb
2014-02-10140211-008HA3.00 ppb
2014-08-11140812-007HAND
2014-08-11140812-006HA3.00 ppb
2014-11-10141111-004HAND
2014-11-10141111-003HAND
2015-02-09150210-006HAND
2015-02-09150210-005HAND
2015-05-11150512-010HAND
2015-05-11150512-009HA2.00 ppb
2015-08-10150811-010HAND
2015-08-10150811-009HAND
2015-11-12151113-008HA3.00 ppb
2015-11-12151113-007HA3.00 ppb
2016-02-09160211-001HA13.0 ppb
2016-02-09160211-002HAND
2016-05-10160511-004HA2.00 ppb
2016-05-10160511-003HAND
2016-08-09160810-015HAND
2016-11-09161110-007HA9.00 ppb
2016-11-09161110-008HA14.0 ppb
2017-02-14170215-002HA3.00 ppb
2017-02-14170215-001HA7.00 ppb
2017-05-09170510-006HAND
2017-05-09170510-005HA3.00 ppb
2017-08-10170811-010HAND
2017-08-10170811-009HA8.00 ppb
2017-11-16171117-009HAND
2017-11-16171117-008HAND