Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Monochloroacetic acid

Washington Water Authority WWA

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
20140.138 ppb161ND - 2.20 ppb
20150.238 ppb161ND - 3.80 ppb
20160.281 ppb162ND - 2.50 ppb
20170.988 ppb166ND - 3.40 ppb
20181.41 ppb167ND - 3.70 ppb
20191.14 ppb166ND - 4.20 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
2014-02-1814051010601ND
2014-02-1814051010701ND
2014-02-1814051010801ND
2014-02-1814051010901ND
2014-05-05141280142012.20 ppb
2014-05-0514128014101ND
2014-05-0514128014001ND
2014-05-0514128014301ND
2014-08-0614219005701ND
2014-08-0614219003301ND
2014-08-0614219003201ND
2014-08-1314227000501ND
2014-10-2914304001701ND
2014-10-2914304001601ND
2014-10-2914304001501ND
2014-10-2914304001801ND
2015-01-2715029003601ND
2015-01-2715029003401ND
2015-01-2715029003701ND
2015-01-2715029003501ND
2015-04-2815120007401ND
2015-04-2815120007701ND
2015-04-2815120007601ND
2015-04-2815120007501ND
2015-07-3015212003501ND
2015-07-3015212003701ND
2015-07-3015212003401ND
2015-07-3015212003601ND
2015-10-2715303001701ND
2015-10-2715303001501ND
2015-10-2715303001601ND
2015-10-27153030018013.80 ppb
2016-01-2616029004801ND
2016-01-2616029004901ND
2016-01-2616029004601ND
2016-01-2616029004701ND
2016-04-2616119008301ND
2016-04-2616119008401ND
2016-04-26161190082012.00 ppb
2016-04-2616119008501ND
2016-07-26162100041012.50 ppb
2016-07-2616210003801ND
2016-07-2616210003901ND
2016-07-2616210004001ND
2016-10-2616301005301ND
2016-10-2616301005501ND
2016-10-2616301005201ND
2016-10-2616301005401ND
2017-01-2617027001301ND
2017-01-2617027001501ND
2017-01-2617027001401ND
2017-01-2617027001601ND
2017-04-17171100062012.40 ppb
2017-04-17171100061012.50 ppb
2017-04-17171100060012.60 ppb
2017-04-17171100063012.10 ppb
2017-07-1917202001601ND
2017-07-1917202001401ND
2017-07-19172020017013.40 ppb
2017-07-1917202001501ND
2017-10-1817293003501ND
2017-10-1817293003401ND
2017-10-1817293003601ND
2017-10-18172930037012.80 ppb
2018-02-1418046006301ND
2018-02-1418046006601ND
2018-02-1418046006401ND
2018-02-1418046006501ND
2018-04-24181160064013.70 ppb
2018-04-24181160063013.50 ppb
2018-04-24181160066013.50 ppb
2018-04-24181160065013.70 ppb
2018-07-2318207010001ND
2018-07-2318207009901ND
2018-07-2318207009801ND
2018-07-23182070097013.00 ppb
2018-11-27183320026012.50 ppb
2018-11-2718332002701ND
2018-11-2718332002801ND
2018-11-27183320029012.70 ppb
2019-01-30190310126012.20 ppb
2019-01-30190310128012.30 ppb
2019-01-30190310127012.20 ppb
2019-01-3119031012901ND
2019-04-1719109000701ND
2019-04-1719109001001ND
2019-04-1719109000901ND
2019-04-1719109000801ND
2019-07-1619199008101ND
2019-07-1619199008001ND
2019-09-23192680013014.20 ppb
2019-09-2319268001401ND
2019-10-15192900105013.10 ppb
2019-10-1519290010301ND
2019-10-1519290010401ND
2019-10-15192900102014.20 ppb