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EWG's Tap Water Database — 2021 UPDATE

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Dichloroacetic acid

Connecticut Water Company - Northern Region-Western System

Dichloroacetic 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

 

160

Samples

0

Samples exceeding legal limit (MCL)

156

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20146.03 ppb3231ND - 12.0 ppb
2015N/A00N/A
20164.78 ppb3230ND - 10.00 ppb
20176.26 ppb32321.90 ppb - 12.0 ppb
20187.03 ppb3231ND - 17.0 ppb
20195.93 ppb32320.700 ppb - 13.0 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.2 ppb

The EWG Health Guideline of 0.2 ppb for dichloroacetic 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.a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.

ppb = parts per billion

All test results

Date Lab ID Result
2014-02-041747HAA58.00 ppb
2014-02-041748HAA55.00 ppb
2014-02-041749HAA511.0 ppb
2014-02-041750HAA52.00 ppb
2014-02-041751HAA511.0 ppb
2014-02-041752HAA510.00 ppb
2014-02-041753HAA512.0 ppb
2014-02-041754HAA56.00 ppb
2014-05-063067HAA56.00 ppb
2014-05-066107HAA59.00 ppb
2014-05-066108HAA59.00 ppb
2014-05-066109HAA56.00 ppb
2014-05-066110HAA510.00 ppb
2014-05-066112HAA55.00 ppb
2014-05-066113HAA510.00 ppb
2014-05-066114HAA512.0 ppb
2014-08-05BG88648HAA55.70 ppb
2014-08-05BG88649HAA51.30 ppb
2014-08-05BG88650HAA52.80 ppb
2014-08-05BG88651HAA55.80 ppb
2014-08-05BG88652HAA52.70 ppb
2014-08-05BG88653HAA51.40 ppb
2014-08-05BG88654HAA52.60 ppb
2014-08-05BG88655HAA51.30 ppb
2014-11-25BH46470HAA5ND
2014-11-25BH46471HAA54.10 ppb
2014-11-25BH46472HAA54.30 ppb
2014-11-25BH46473HAA55.60 ppb
2014-11-25BH46474HAA54.50 ppb
2014-11-25BH46475HAA52.50 ppb
2014-11-25BH46476HAA58.20 ppb
2014-11-25BH46477HAA58.10 ppb
2016-02-04BK61857HAA54.00 ppb
2016-02-04BK61858HAA56.20 ppb
2016-02-04BK61859HAA58.30 ppb
2016-02-04BK61860HAA58.70 ppb
2016-02-04BK61861HAA54.50 ppb
2016-02-04BK61862HAA53.70 ppb
2016-02-04BK61863HAA55.80 ppb
2016-02-04BK61864HAA55.60 ppb
2016-05-05BN26300HAA5ND
2016-05-05BN26301HAA55.80 ppb
2016-05-05BN26302HAA510.00 ppb
2016-05-05BN26303HAA510.00 ppb
2016-05-05BN26304HAA56.20 ppb
2016-05-05BN26305HAA5ND
2016-05-05BN26306HAA54.60 ppb
2016-05-05BN26307HAA55.50 ppb
2016-08-18BN94948HAA53.60 ppb
2016-08-18BN94949HAA53.60 ppb
2016-08-18BN94950HAA51.20 ppb
2016-08-18BN94951HAA53.20 ppb
2016-08-18BN94952HAA53.50 ppb
2016-08-18BN94953HAA51.60 ppb
2016-08-18BN94954HAA56.80 ppb
2016-08-18BN94955HAA55.30 ppb
2016-11-03BV75338HAA52.90 ppb
2016-11-03BV75339HAA54.90 ppb
2016-11-03BV75340HAA53.90 ppb
2016-11-03BV75341HAA55.80 ppb
2016-11-03BV75342HAA54.50 ppb
2016-11-03BV75343HAA53.20 ppb
2016-11-03BV75344HAA54.60 ppb
2016-11-03BV75345HAA55.40 ppb
2017-02-02BX44867HAA51.90 ppb
2017-02-02BX44868HAA55.40 ppb
2017-02-02BX44869HAA55.70 ppb
2017-02-02BX44870HAA57.00 ppb
2017-02-02BX44871HAA55.70 ppb
2017-02-02BX44872HAA52.40 ppb
2017-02-02BX44873HAA59.30 ppb
2017-02-02BX44874HAA58.80 ppb
2017-05-04BY15439HAA52.50 ppb
2017-05-04BY15440HAA56.00 ppb
2017-05-04BY15441HAA55.20 ppb
2017-05-04BY15442HAA512.0 ppb
2017-05-04BY15443HAA58.30 ppb
2017-05-04BY15444HAA53.80 ppb
2017-05-04BY15445HAA57.80 ppb
2017-05-04BY15446HAA57.40 ppb
2017-08-07BY79801HAA52.60 ppb
2017-08-07BY79802HAA53.50 ppb
2017-08-07BY79803HAA54.90 ppb
2017-08-07BY79804HAA59.40 ppb
2017-08-07BY79805HAA53.40 ppb
2017-08-07BY79806HAA56.30 ppb
2017-08-07BY79807HAA57.40 ppb
2017-08-07BY79808HAA56.50 ppb
2017-11-06BZ33918HAA56.10 ppb
2017-11-16BZ43465HAA58.40 ppb
2017-11-16BZ43466HAA58.20 ppb
2017-11-16BZ43467HAA55.30 ppb
2017-11-16BZ43468HAA54.30 ppb
2017-11-16BZ43469HAA55.20 ppb
2017-11-16BZ43470HAA59.50 ppb
2017-11-16BZ43471HAA510.00 ppb
2018-02-01BZ83504HAA517.0 ppb
2018-02-01BZ83505HAA511.0 ppb
2018-02-01BZ83506HAA516.0 ppb
2018-02-01BZ83507HAA55.30 ppb
2018-02-01BZ83508HAA57.30 ppb
2018-02-01BZ83509HAA58.30 ppb
2018-02-01BZ83510HAA57.60 ppb
2018-02-21BZ93283HAA57.80 ppb
2018-05-03CA41161HAA512.0 ppb
2018-05-03CA41162HAA513.0 ppb
2018-05-03CA41163HAA513.0 ppb
2018-05-03CA41164HAA53.40 ppb
2018-05-03CA41165HAA54.70 ppb
2018-05-03CA41166HAA57.10 ppb
2018-05-03CA41167HAA57.20 ppb
2018-05-15CA48118HAA510.00 ppb
2018-08-02CB040201.80 ppb
2018-08-02CB040215.00 ppb
2018-08-02CB040223.00 ppb
2018-08-02CB040233.00 ppb
2018-08-02CB040246.40 ppb
2018-08-02CB0402510.00 ppb
2018-08-02CB0402611.0 ppb
2018-08-06CB058405.90 ppb
2018-11-01DBP 2005111331.60 ppb
2018-11-01DBP 2005111340.900 ppb
2018-11-01DBP 2005111351.000 ppb
2018-11-01DBP 200511136ND
2018-11-01DBP 2005111375.80 ppb
2018-11-01DBP 2005111385.20 ppb
2018-11-01DBP 2005111396.50 ppb
2018-11-05DBP 2005113897.00 ppb
2019-02-07DBP 2005210835.20 ppb
2019-02-07DBP 2005210848.30 ppb
2019-02-07DBP 2005210854.30 ppb
2019-02-07DBP 2005210868.80 ppb
2019-02-07DBP 2005210873.90 ppb
2019-02-07DBP 20052108810.4 ppb
2019-02-07DBP 2005210898.60 ppb
2019-02-11DBP 2005212566.60 ppb
2019-05-09DBP 2005315752.10 ppb
2019-05-09DBP 20053157611.6 ppb
2019-05-09DBP 20053157713.0 ppb
2019-05-09DBP 20053158211.3 ppb
2019-05-09DBP 2005315845.90 ppb
2019-05-09DBP 2005315866.60 ppb
2019-05-09DBP 2005315876.70 ppb
2019-05-13DBP 2005318377.30 ppb
2019-08-01DBP 2005427221.40 ppb
2019-08-01DBP 2005427232.00 ppb
2019-08-01DBP 2005427246.10 ppb
2019-08-01DBP 2005427250.700 ppb
2019-08-01DBP 2005427266.90 ppb
2019-08-01DBP 2005427276.20 ppb
2019-08-01DBP 2005427285.60 ppb
2019-08-13DBP 2005447589.40 ppb
2019-11-07DBP 2005558280.800 ppb
2019-11-07DBP 2005558301.40 ppb
2019-11-07DBP 2005558313.30 ppb
2019-11-07DBP 2005558320.700 ppb
2019-11-07DBP 2005558336.40 ppb
2019-11-07DBP 2005558346.10 ppb
2019-11-07DBP 2005558355.60 ppb
2019-11-18DBP 2005570046.60 ppb