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EWG's Tap Water Database — 2019 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.

 

60

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20122.56 ppb166ND - 8.00 ppb
20130.950 ppb203ND - 7.00 ppb
20141.000 ppb81ND - 8.00 ppb
2015N/A00N/A
20161.39 ppb82ND - 6.40 ppb
20172.08 ppb84ND - 5.60 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
2012-02-152597HAA5ND
2012-02-152598HAA5ND
2012-02-152599HAA5ND
2012-02-152600HAA5ND
2012-04-195836HAA5ND
2012-04-195835HAA5ND
2012-04-195834HAA58.00 ppb
2012-04-195833HAA57.00 ppb
2012-08-1311791HAA5ND
2012-08-1311790HAA5ND
2012-08-1311789HAA56.00 ppb
2012-08-1311788HAA58.00 ppb
2012-10-1515446HAA5ND
2012-10-1515447HAA56.00 ppb
2012-10-1515448HAA56.00 ppb
2012-10-1515449HAA5ND
2013-01-16749HAA56.00 ppb
2013-01-16748HAA5ND
2013-01-16747HAA5ND
2013-01-16746HAA5ND
2013-06-128436HAA5ND
2013-06-128437HAA5ND
2013-06-128438HAA56.00 ppb
2013-06-128439HAA57.00 ppb
2013-08-1212073HAA5ND
2013-08-1212072HAA5ND
2013-08-1212071HAA5ND
2013-08-1212070HAA5ND
2013-09-2315282HAA5ND
2013-09-2315283HAA5ND
2013-10-2316243HAA5ND
2013-10-2316242HAA5ND
2013-10-2316241HAA5ND
2013-10-2316240HAA5ND
2013-12-1819439HAA5ND
2013-12-1819440HAA5ND
2014-03-213486HAA58.00 ppb
2014-03-213487HAA5ND
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
2017-03-17BX89075HAA53.60 ppb
2017-03-17BX89074HAA5ND
2017-06-19BY42244HAA5ND
2017-06-19BY42245HAA55.60 ppb
2017-09-14BZ02391HAA5ND
2017-09-14BZ02392HAA54.20 ppb
2017-12-14BZ60235HAA5ND
2017-12-14BZ60236HAA53.20 ppb