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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

Rainbow Municipal WD

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

 

88

Samples

0

Samples exceeding legal limit (MCL)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20144.35 ppb2012ND - 13.0 ppb
20159.73 ppb1613ND - 50.0 ppb
20160.406 ppb162ND - 4.10 ppb
201711.5 ppb126ND - 86.0 ppb
2018ND80ND
20192.63 ppb165ND - 15.0 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
2014-03-134790-900-11006.40 ppb
2014-03-134790-901-1145ND
2014-03-134790-902-10003.90 ppb
2014-03-134790-903-0900ND
2014-06-164790-900-10205.60 ppb
2014-06-164790-901-09307.50 ppb
2014-06-164790-902-110013.0 ppb
2014-06-164790-903-11308.10 ppb
2014-09-114790-902-09157.60 ppb
2014-09-114790-902-0000ND
2014-09-114790-903-0000ND
2014-09-114790-901-10454.70 ppb
2014-09-114790-901-0000ND
2014-09-114790-903-08308.20 ppb
2014-09-114790-900-10107.50 ppb
2014-09-114790-900-0000ND
2014-12-164790-902-104511.0 ppb
2014-12-164790-901-09003.40 ppb
2014-12-164790-903-1000ND
2014-12-164790-900-1125ND
2015-03-124790-903-091523.0 ppb
2015-03-124790-902-104550.0 ppb
2015-03-124790-901-0800ND
2015-03-124790-900-1000ND
2015-06-114790-903-09307.40 ppb
2015-06-114790-902-10005.20 ppb
2015-06-114790-900-11006.60 ppb
2015-06-114790-901-11357.30 ppb
2015-09-144790-900-10053.30 ppb
2015-09-144790-903-1130ND
2015-09-144790-902-104521.0 ppb
2015-09-144790-901-09302.40 ppb
2015-12-144790-902-10007.60 ppb
2015-12-144790-903-090010.00 ppb
2015-12-144790-901-11302.90 ppb
2015-12-144790-900-10408.90 ppb
2016-03-084790-902-0930ND
2016-03-084790-901-1100ND
2016-03-084790-903-08402.40 ppb
2016-03-084790-900-10154.10 ppb
2016-06-164790-900-1015ND
2016-06-164790-902-0800ND
2016-06-164790-901-1100ND
2016-06-164790-903-0850ND
2016-09-154790-900-1100ND
2016-09-154790-903-1030ND
2016-09-154790-901-1205ND
2016-09-154790-902-1000ND
2016-12-134790-903-1020ND
2016-12-134790-902-0930ND
2016-12-134790-900-1100ND
2016-12-134790-901-1140ND
2017-06-134790-901-0830ND
2017-06-134790-900-0915ND
2017-06-134790-902-11003.60 ppb
2017-06-134790-903-10105.10 ppb
2017-09-144790-900-100086.0 ppb
2017-09-144790-901-11007.80 ppb
2017-09-144790-903-09309.00 ppb
2017-09-144790-902-105027.0 ppb
2017-12-124790-901-1140ND
2017-12-124790-903-0915ND
2017-12-124790-902-1030ND
2017-12-124790-900-1100ND
2018-03-154790-903-0955ND
2018-03-154790-902-1035ND
2018-03-154790-901-1030ND
2018-03-154790-900-1130ND
2018-06-064790-900-1120ND
2018-06-064790-903-0940ND
2018-06-064790-902-0900ND
2018-06-064790-901-1150ND
2019-03-134790-901-1150ND
2019-03-134790-903-1030ND
2019-03-134790-902-1000ND
2019-03-134790-900-1105ND
2019-06-114790-901-08554.80 ppb
2019-06-114790-902-111010.00 ppb
2019-06-114790-900-09509.60 ppb
2019-06-114790-903-114515.0 ppb
2019-09-114790-900-1035ND
2019-09-114790-901-0925ND
2019-09-114790-903-1225ND
2019-09-114790-902-1145ND
2019-12-124790-900-1200ND
2019-12-124790-901-1240ND
2019-12-124790-903-10402.70 ppb
2019-12-124790-902-1140ND