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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

Hope Water Light Comm.

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
20141.15 ppb205ND - 7.10 ppb
20152.09 ppb166ND - 8.80 ppb
20160.488 ppb162ND - 4.60 ppb
20170.438 ppb162ND - 4.60 ppb
20181.16 ppb134ND - 5.20 ppb
20191.08 ppb153ND - 7.20 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
2014-01-0714010003901ND
2014-01-0714010003701ND
2014-01-0714010004101ND
2014-01-0714010003801ND
2014-04-01140940012013.70 ppb
2014-04-0114094000901ND
2014-04-01140940010017.10 ppb
2014-04-0114094001301ND
2014-05-2114142008701ND
2014-05-21141420085013.50 ppb
2014-05-2114142008901ND
2014-05-2114142008601ND
2014-07-02141840135015.50 ppb
2014-07-02141840137013.10 ppb
2014-07-0214184013901ND
2014-07-0214184013601ND
2014-10-0114276000901ND
2014-10-0114276000601ND
2014-10-0114276000501ND
2014-10-0114276000801ND
2015-01-0515008002201ND
2015-01-0515008002301ND
2015-01-0515008001901ND
2015-01-0515008002001ND
2015-04-0615100001301ND
2015-04-06151000010012.10 ppb
2015-04-06151000009013.60 ppb
2015-04-0615100001201ND
2015-07-08151900035017.00 ppb
2015-07-08151900033018.80 ppb
2015-07-0815190003601ND
2015-07-08151900032018.60 ppb
2015-10-0515282000601ND
2015-10-05152820003013.30 ppb
2015-10-0515282000501ND
2015-10-0515282000401ND
2016-01-0616008010101ND
2016-01-0616008010001ND
2016-01-0616008010201ND
2016-01-0616008010301ND
2016-04-0416098011301ND
2016-04-0416098011601ND
2016-04-0416098011401ND
2016-04-0416098011501ND
2016-07-0516189010401ND
2016-07-05161890105014.60 ppb
2016-07-0516189010701ND
2016-07-0516189010601ND
2016-10-0516280009301ND
2016-10-0516280009401ND
2016-10-05162800092013.20 ppb
2016-10-0516280009501ND
2017-01-0417005004501ND
2017-01-0417005004701ND
2017-01-04170050046012.40 ppb
2017-01-0417005004801ND
2017-05-0917130009101ND
2017-05-0917130009001ND
2017-05-09171300089014.60 ppb
2017-05-0917130008801ND
2017-07-0517187003601ND
2017-07-0517187003701ND
2017-07-0517187003501ND
2017-07-0517187003801ND
2017-10-0417278003701ND
2017-10-0417278003801ND
2017-10-0417278003601ND
2017-10-2417299002501ND
2018-01-0318004006701ND
2018-01-0318004006601ND
2018-01-0318004006501ND
2018-01-0318004006401ND
2018-04-0418095009101ND
2018-04-0418095009001ND
2018-04-0418095009201ND
2018-04-04180950089012.60 ppb
2018-07-03181860059013.90 ppb
2018-07-03181860060013.40 ppb
2018-07-0318186005701ND
2018-07-0318186005801ND
2018-10-03182770064015.20 ppb
2019-01-0919010009201ND
2019-01-0919010009001ND
2019-01-09190100093014.60 ppb
2019-01-0919010009101ND
2019-04-02190940040014.40 ppb
2019-04-0219094004301ND
2019-04-0219094004101ND
2019-04-0219094004201ND
2019-08-1919233000301ND
2019-08-1919233000501ND
2019-08-1919233000401ND
2019-10-0219276003701ND
2019-10-02192760036017.20 ppb
2019-10-0219276003901ND
2019-10-0219276003801ND