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EWG's Tap Water Database — 2019 UPDATE

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Monochloroacetic acid

Rincon Del Diablo MWD(ID-1)

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.

 

81

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND120ND
20131.45 ppb168ND - 4.60 ppb
20141.85 ppb103ND - 6.50 ppb
20152.97 ppb188ND - 19.0 ppb
20161.48 ppb136ND - 4.70 ppb
20170.417 ppb122ND - 2.60 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
2012-05-033761-901-0936ND
2012-05-033761-903-0923ND
2012-05-033761-902-0839ND
2012-05-033761-900-0907ND
2012-08-223761-900-1022ND
2012-08-223761-901-1118ND
2012-08-223761-903-1104ND
2012-08-223761-902-0930ND
2012-11-073761-901-0937ND
2012-11-073761-902-0800ND
2012-11-073761-900-0900ND
2012-11-073761-903-0930ND
2013-02-133761-901-0952ND
2013-02-133761-903-1200ND
2013-02-133761-902-1329ND
2013-02-133761-900-1233ND
2013-05-144790-900-11352.00 ppb
2013-05-144790-902-12382.00 ppb
2013-05-144790-901-1100ND
2013-05-144790-903-1053ND
2013-08-064790-900-0856ND
2013-08-064790-901-09343.30 ppb
2013-08-064790-903-09202.80 ppb
2013-08-064790-902-08232.00 ppb
2013-11-054790-903-10004.60 ppb
2013-11-054790-900-1020ND
2013-11-054790-901-09404.30 ppb
2013-11-054790-902-11002.20 ppb
2014-02-114790-903-10126.00 ppb
2014-02-114790-900-0907ND
2014-02-114790-902-08116.00 ppb
2014-02-114790-901-09476.50 ppb
2014-08-054790-902-0740ND
2014-08-054790-903-0930ND
2014-08-054790-901-0810ND
2014-08-054790-900-0833ND
2014-08-054790-900-0848ND
2014-08-054790-901-0945ND
2015-02-034790-900-11133.50 ppb
2015-02-034790-902-0820ND
2015-02-034790-901-10076.00 ppb
2015-02-034790-903-1023ND
2015-05-124790-901-1030ND
2015-05-124790-902-0835ND
2015-05-124790-900-0930ND
2015-05-124790-903-1015ND
2015-08-044790-900-1150ND
2015-08-044790-902-12254.80 ppb
2015-08-044790-901-1128ND
2015-08-044790-903-11145.90 ppb
2015-11-034790-903-09452.90 ppb
2015-11-034790-900-11158.00 ppb
2015-11-034790-901-10003.30 ppb
2015-11-034790-902-0815ND
2015-11-034790-900-0910ND
2015-11-034790-901-104019.0 ppb
2016-02-024790-900-09282.50 ppb
2016-05-034790-900-11002.20 ppb
2016-05-034790-901-09314.70 ppb
2016-05-034790-902-11353.70 ppb
2016-05-034790-903-09174.20 ppb
2016-08-024790-903-11132.00 ppb
2016-08-024790-900-1008ND
2016-08-024790-902-0908ND
2016-08-024790-901-1053ND
2016-11-014790-902-0840ND
2016-11-014790-901-1025ND
2016-11-014790-900-0930ND
2016-11-014790-903-0925ND
2017-05-024790-901-0931ND
2017-05-024790-902-1050ND
2017-05-024790-900-1016ND
2017-05-024790-903-0955ND
2017-08-084790-903-10202.40 ppb
2017-08-084790-901-1036ND
2017-08-084790-900-09382.60 ppb
2017-08-084790-902-0902ND
2017-11-074790-902-1120ND
2017-11-074790-903-0910ND
2017-11-074790-901-0855ND
2017-11-074790-900-0950ND