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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

Connecticut Water Company - Shoreline Region-chester System

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

 

40

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20141.000 ppb81ND - 8.00 ppb
2015N/A00N/A
20161.39 ppb82ND - 6.40 ppb
20172.08 ppb84ND - 5.60 ppb
20182.31 ppb85ND - 6.00 ppb
20192.31 ppb881.30 ppb - 3.80 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
2014-03-213487HAA5ND
2014-03-213486HAA58.00 ppb
2014-06-188763HAA5ND
2014-06-188762HAA5ND
2014-09-15BH14105HAA5ND
2014-09-15BH14106HAA5ND
2014-12-17BH54712HAA5ND
2014-12-17BH54713HAA5ND
2016-03-15BK78694HAA5ND
2016-03-15BK78695HAA5ND
2016-06-14BN54615HAA5ND
2016-06-14BN54614HAA5ND
2016-09-14BV14926HAA56.40 ppb
2016-09-14BV14927HAA54.70 ppb
2016-12-15BX06132HAA5ND
2016-12-15BX06133HAA5ND
2017-03-17BX89074HAA5ND
2017-03-17BX89075HAA53.60 ppb
2017-06-19BY42244HAA5ND
2017-06-19BY42245HAA55.60 ppb
2017-09-14BZ02391HAA5ND
2017-09-14BZ02392HAA54.20 ppb
2017-12-14BZ60235HAA5ND
2017-12-14BZ60236HAA53.20 ppb
2018-03-15CA03070HAA5ND
2018-03-15CA03071HAA53.90 ppb
2018-06-26CA80049HAA5ND
2018-06-26CA80050HAA56.00 ppb
2018-09-24DBP 200506696ND
2018-09-24DBP 2005066983.40 ppb
2018-12-21DBP 2005167912.60 ppb
2018-12-21DBP 2005168622.60 ppb
2019-03-12DBP 2005243481.90 ppb
2019-03-12DBP 2005243492.60 ppb
2019-06-14DBP 2005366663.50 ppb
2019-06-14DBP 2005366713.80 ppb
2019-09-17DBP 2005494821.70 ppb
2019-09-17DBP 2005494832.00 ppb
2019-12-10DBP 2005596401.70 ppb
2019-12-10DBP 2005596411.30 ppb