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EWG's Tap Water Database — 2021 UPDATE

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Dichloroacetic acid

Danbury Water Department

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

 

165

Samples

0

Samples exceeding legal limit (MCL)

153

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20148.95 ppb37371.000 ppb - 20.0 ppb
2015N/A00N/A
201610.6 ppb32321.50 ppb - 28.8 ppb
20179.54 ppb3223ND - 21.0 ppb
20187.31 ppb3231ND - 14.2 ppb
20196.01 ppb3230ND - 13.8 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
2014-01-06E401245-1CH13.0 ppb
2014-01-06E401245-2CH1.000 ppb
2014-03-11E403C94-2CH13.0 ppb
2014-03-11E403C94-4CH2.60 ppb
2014-03-11E403C94-7CH11.0 ppb
2014-03-12E403C94-1CH4.70 ppb
2014-03-13E403C94-6CH7.90 ppb
2014-03-14E403C94-8CH9.40 ppb
2014-03-17E403C94-3CH8.70 ppb
2014-03-18E403C94-5CH5.90 ppb
2014-06-10E406G56-4CH2.40 ppb
2014-06-10E406G56-6CH20.0 ppb
2014-06-11E406G56-1CH2.60 ppb
2014-06-12E406G56-2CH3.30 ppb
2014-06-12E406G56-7CH18.0 ppb
2014-06-12E406G56-8CH13.0 ppb
2014-06-13E406G56-5CH11.0 ppb
2014-06-16E406G56-3CH9.70 ppb
2014-09-10E409F66-1GE3.10 ppb
2014-09-11E409F66-4GE2.30 ppb
2014-09-11E409F66-6GE19.0 ppb
2014-09-12E409F66-2GE17.0 ppb
2014-09-12E409F66-8GE17.0 ppb
2014-09-15E409F66-3GE14.0 ppb
2014-09-23E409M19-1GE1.20 ppb
2014-09-23E409M19-2GE9.20 ppb
2014-09-23E409M19-3GE15.0 ppb
2014-09-30E409T37-2GE6.20 ppb
2014-09-30E410021-1GE8.70 ppb
2014-12-12E412D88-1GE2.50 ppb
2014-12-12E412D88-7GE8.70 ppb
2014-12-12E412D88-8GE11.0 ppb
2014-12-15E412D88-2GE6.50 ppb
2014-12-15E412D88-3GE13.0 ppb
2014-12-15E412D88-4GE1.60 ppb
2014-12-15E412D88-6GE10.00 ppb
2014-12-16E412D88-5GE7.90 ppb
2016-03-09E603E03-1-16GE1.50 ppb
2016-03-09E603E03-4-18GE2.00 ppb
2016-03-10E603E03-5-19GE6.60 ppb
2016-03-10E603E03-6-20GE9.30 ppb
2016-03-10E603E03-7-15GE11.0 ppb
2016-03-10E603E03-2-17GE4.90 ppb
2016-03-11E603E03-8-04GE8.10 ppb
2016-03-14E603E03-3-03GE11.0 ppb
2016-06-16E606O13-1-16GE2.10 ppb
2016-06-16E606O13-2-17GE18.0 ppb
2016-06-16E606O13-4-18GE1.70 ppb
2016-06-16E606O13-5-19GE8.80 ppb
2016-06-16E606O13-8-04GE13.0 ppb
2016-06-16E606O13-6-20GE17.0 ppb
2016-06-20E606O13-7-15GE15.0 ppb
2016-06-20E606O13-3-03GE8.50 ppb
2016-09-08188688CH4.80 ppb
2016-09-09188692CH28.8 ppb
2016-09-13188678CH3.00 ppb
2016-09-13188680CH28.7 ppb
2016-09-13188682CH18.0 ppb
2016-09-13188684CH2.60 ppb
2016-09-13188690CH14.4 ppb
2016-09-14188686CH6.40 ppb
2016-12-12192765CH14.0 ppb
2016-12-13192767CH19.0 ppb
2016-12-13192769CH15.0 ppb
2016-12-13192761CH3.70 ppb
2016-12-13192763CH10.00 ppb
2016-12-13192755CH8.30 ppb
2016-12-13192757CH10.00 ppb
2016-12-14192759CH13.0 ppb
2017-03-09196060GE13.0 ppb
2017-03-09196062GE14.0 ppb
2017-03-09196066GE4.10 ppb
2017-03-13196064GE21.0 ppb
2017-03-14196070GE12.0 ppb
2017-03-15196072GE15.0 ppb
2017-03-15196074GE14.0 ppb
2017-03-15196068GE9.40 ppb
2017-06-13200346GEND
2017-06-13200352GE19.0 ppb
2017-06-14200340GE13.0 ppb
2017-06-14200342GE17.0 ppb
2017-06-14200350GE20.0 ppb
2017-06-15200354GE19.0 ppb
2017-06-15200348GE14.0 ppb
2017-06-15200344GE16.0 ppb
2017-09-12204479GEND
2017-09-12204473GE3.80 ppb
2017-09-12204475GE17.0 ppb
2017-09-12204485GE10.00 ppb
2017-09-12204487GE13.0 ppb
2017-09-13204477GE14.0 ppb
2017-09-13204481GE6.70 ppb
2017-09-13204483GE6.30 ppb
2017-12-11208504GEND
2017-12-11208506GEND
2017-12-12208508GE14.0 ppb
2017-12-12208510GEND
2017-12-12208512GEND
2017-12-12208514GEND
2017-12-12208500GEND
2017-12-12208502GEND
2018-03-14211585GE8.30 ppb
2018-03-14211587GE8.70 ppb
2018-03-14211589GE10.00 ppb
2018-03-14211591GE3.80 ppb
2018-03-14211599GE9.70 ppb
2018-03-15211593GE7.80 ppb
2018-03-15211595GE9.70 ppb
2018-03-15211597GE10.00 ppb
2018-06-19215751GE10.4 ppb
2018-06-19215737GE4.80 ppb
2018-06-19215739GE14.0 ppb
2018-06-19215743GE2.40 ppb
2018-06-19215745GE9.40 ppb
2018-06-20215747GE14.2 ppb
2018-06-20215749GE4.90 ppb
2018-06-20215741GE10.00 ppb
2018-09-14DBP 2005054847.40 ppb
2018-09-14DBP 20050548611.2 ppb
2018-09-14DBP 2005054914.60 ppb
2018-09-14DBP 2005054931.90 ppb
2018-09-14DBP 2005054952.20 ppb
2018-09-14DBP 2005054975.40 ppb
2018-09-14DBP 2005054991.80 ppb
2018-09-17DBP 200505658ND
2018-12-14DBP 2005160937.10 ppb
2018-12-14DBP 2005160945.50 ppb
2018-12-14DBP 2005160957.30 ppb
2018-12-14DBP 2005160960.600 ppb
2018-12-14DBP 20051609711.3 ppb
2018-12-14DBP 2005160987.20 ppb
2018-12-14DBP 20051609912.8 ppb
2018-12-14DBP 2005161009.50 ppb
2019-03-14DBP 2005247606.20 ppb
2019-03-14DBP 2005247615.90 ppb
2019-03-14DBP 2005247627.00 ppb
2019-03-14DBP 2005247633.80 ppb
2019-03-14DBP 2005247646.90 ppb
2019-03-14DBP 20052476510.3 ppb
2019-03-14DBP 20052476611.6 ppb
2019-03-14DBP 2005247678.00 ppb
2019-06-20DBP 2005372653.30 ppb
2019-06-20DBP 2005372667.30 ppb
2019-06-20DBP 2005372677.00 ppb
2019-06-20DBP 200537268ND
2019-06-20DBP 2005372697.40 ppb
2019-06-20DBP 20053727012.1 ppb
2019-06-20DBP 2005372711.80 ppb
2019-06-20DBP 2005372728.80 ppb
2019-09-19DBP 200549612ND
2019-09-19DBP 20054961313.8 ppb
2019-09-19DBP 2005496150.600 ppb
2019-09-19DBP 2005496173.00 ppb
2019-09-19DBP 2005496183.40 ppb
2019-10-11DBP 2005525033.90 ppb
2019-10-11DBP 2005525045.90 ppb
2019-10-11DBP 2005525056.90 ppb
2019-12-19DBP 2005609262.80 ppb
2019-12-19DBP 2005609275.40 ppb
2019-12-19DBP 2005609295.20 ppb
2019-12-19DBP 2005609309.10 ppb
2019-12-19DBP 2005609319.30 ppb
2019-12-19DBP 2005609321.50 ppb
2019-12-19DBP 2005609347.00 ppb
2019-12-19DBP 2005609357.10 ppb