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EWG's Tap Water Database — 2021 UPDATE

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Haloacetic acids (HAA5)

Danbury Water Department

Haloacetic acids are formed when disinfectants such as chlorine are added to tap water. The group of five haloacetic acids regulated by federal standards includes monochloroacetic acid, dichloroacetic acid, trichloroacetic acid, monobromoacetic acid and dibromoacetic acid. Read More.

Haloacetic acids are harmful during pregnancy and may increase the risk of cancer. Haloacetic acids are� genotoxic, which means that they induce mutations and DNA damage. Multiple studies by the National Toxicology Program have demonstrated the cancer-causing properties of individual haloacetic acids in laboratory animals. The Department of Health and Human Services is currently considering listing di- or tri-haloacetic acids for possible inclusion in its comprehensive Report on Carcinogens.

Click here to read more about disinfection byproducts.

MORE ABOUT THIS CONTAMINANT

 

197

Samples

0

Samples exceeding legal limit (MCL)

195

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201422.5 ppb37371.80 ppb - 48.0 ppb
201521.4 ppb32321.80 ppb - 43.0 ppb
201623.1 ppb32322.10 ppb - 48.0 ppb
201725.2 ppb32321.70 ppb - 47.5 ppb
201819.0 ppb3231ND - 29.4 ppb
201916.1 ppb3231ND - 39.8 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.1 ppb

The EWG Health Guideline of 0.1 ppb for the group of five haloacetic acids, or HAA5, was defined in a peer-reviewed scientific study by EWG and represents a one-in-a-million lifetime cancer risk level. This health guideline protects against cancer.

EPA Maximum Contaminant
Level (MCL) 60 ppb

The legal limit for the group of five haloacetic acids (HAA5), established in 1998, was based on the need for residual disinfectant levels in water served to customers and the cost of treatment. This limit does not fully protect against the risk of cancer and harm to the developing fetus due to exposure to haloacetic acids.

ppb = parts per billion

All test results

Date Lab ID Result
2014-01-06E401245-1CH33.0 ppb
2014-01-06E401245-2CH2.10 ppb
2014-03-11E403C94-2CH31.0 ppb
2014-03-11E403C94-4CH11.2 ppb
2014-03-11E403C94-7CH25.0 ppb
2014-03-12E403C94-1CH20.0 ppb
2014-03-13E403C94-6CH16.5 ppb
2014-03-14E403C94-8CH24.0 ppb
2014-03-17E403C94-3CH22.0 ppb
2014-03-18E403C94-5CH11.8 ppb
2014-06-10E406G56-4CH10.3 ppb
2014-06-10E406G56-6CH48.0 ppb
2014-06-11E406G56-1CH16.0 ppb
2014-06-12E406G56-2CH18.0 ppb
2014-06-12E406G56-7CH36.0 ppb
2014-06-12E406G56-8CH34.0 ppb
2014-06-13E406G56-5CH25.0 ppb
2014-06-16E406G56-3CH24.0 ppb
2014-09-10E409F66-1GE11.9 ppb
2014-09-11E409F66-4GE3.50 ppb
2014-09-11E409F66-6GE41.5 ppb
2014-09-12E409F66-2GE38.5 ppb
2014-09-12E409F66-8GE38.5 ppb
2014-09-15E409F66-3GE36.0 ppb
2014-09-23E409M19-1GE1.80 ppb
2014-09-23E409M19-2GE21.0 ppb
2014-09-23E409M19-3GE30.0 ppb
2014-09-30E409T37-2GE16.5 ppb
2014-09-30E410021-1GE24.0 ppb
2014-12-12E412D88-1GE13.7 ppb
2014-12-12E412D88-7GE19.5 ppb
2014-12-12E412D88-8GE29.0 ppb
2014-12-15E412D88-2GE19.7 ppb
2014-12-15E412D88-3GE33.0 ppb
2014-12-15E412D88-4GE3.50 ppb
2014-12-15E412D88-6GE26.0 ppb
2014-12-16E412D88-5GE17.7 ppb
2015-03-12E503B60-5GE26.0 ppb
2015-03-12E503B60-2GE26.0 ppb
2015-03-13E503B60-6GE25.0 ppb
2015-03-13E503B60-4GE17.0 ppb
2015-03-13E503B60-1GE13.0 ppb
2015-03-16E503B60-3GE32.0 ppb
2015-03-25E503J77-1GE28.0 ppb
2015-03-26E503J77-2GE22.0 ppb
2015-06-11E506H99-5GE22.0 ppb
2015-06-12E506H99-7GE43.0 ppb
2015-06-12E506H99-8GE23.0 ppb
2015-06-15E506H99-1GE16.0 ppb
2015-06-15E506H99-3GE25.0 ppb
2015-06-15E506H99-4GE14.0 ppb
2015-06-15E506H99-2GE26.0 ppb
2015-06-16E506H99-6GE38.0 ppb
2015-09-18E509O88-8GE27.0 ppb
2015-09-18E509O88-6GE24.0 ppb
2015-09-21E509O88-3GE23.0 ppb
2015-09-21E509O88-2GE38.0 ppb
2015-09-21E509O88-1GE2.30 ppb
2015-09-22E509O88-5GE22.0 ppb
2015-09-29E509W38-1GE1.80 ppb
2015-09-29E509W38-2GE29.0 ppb
2015-12-17E512K74-2-17GE14.1 ppb
2015-12-17E512K74-1-16GE3.10 ppb
2015-12-17E512K74-5-19GE18.6 ppb
2015-12-17E512K74-4-18GE4.20 ppb
2015-12-17E512K74-7-15GE24.0 ppb
2015-12-18E512K74-8-04GE22.0 ppb
2015-12-18E512K74-6-20GE21.0 ppb
2015-12-21E512K74-3-03GE16.1 ppb
2016-03-09E603E03-1-16GE2.10 ppb
2016-03-09E603E03-4-18GE10.9 ppb
2016-03-10E603E03-5-19GE15.7 ppb
2016-03-10E603E03-6-20GE26.0 ppb
2016-03-10E603E03-7-15GE25.0 ppb
2016-03-10E603E03-2-17GE12.1 ppb
2016-03-11E603E03-8-04GE23.0 ppb
2016-03-14E603E03-3-03GE30.0 ppb
2016-06-16E606O13-1-16GE3.30 ppb
2016-06-16E606O13-2-17GE36.0 ppb
2016-06-16E606O13-4-18GE2.50 ppb
2016-06-16E606O13-5-19GE21.7 ppb
2016-06-16E606O13-8-04GE33.0 ppb
2016-06-16E606O13-6-20GE45.0 ppb
2016-06-20E606O13-7-15GE31.0 ppb
2016-06-20E606O13-3-03GE22.0 ppb
2016-09-08188688CH16.6 ppb
2016-09-09188692CH48.0 ppb
2016-09-13188690CH27.5 ppb
2016-09-13188678CH5.10 ppb
2016-09-13188680CH43.2 ppb
2016-09-13188682CH31.3 ppb
2016-09-13188684CH2.60 ppb
2016-09-14188686CH15.4 ppb
2016-12-12192765CH32.0 ppb
2016-12-13192767CH35.0 ppb
2016-12-13192769CH34.0 ppb
2016-12-13192761CH12.7 ppb
2016-12-13192763CH20.0 ppb
2016-12-13192755CH26.3 ppb
2016-12-13192757CH20.0 ppb
2016-12-14192759CH30.0 ppb
2017-03-09196060GE38.0 ppb
2017-03-09196062GE34.0 ppb
2017-03-09196066GE11.9 ppb
2017-03-13196064GE45.0 ppb
2017-03-14196070GE29.0 ppb
2017-03-15196072GE32.0 ppb
2017-03-15196074GE35.0 ppb
2017-03-15196068GE20.8 ppb
2017-06-13200346GE2.20 ppb
2017-06-13200352GE37.6 ppb
2017-06-14200350GE47.5 ppb
2017-06-14200340GE33.5 ppb
2017-06-14200342GE35.9 ppb
2017-06-15200354GE44.1 ppb
2017-06-15200344GE34.9 ppb
2017-06-15200348GE29.5 ppb
2017-09-12204473GE9.40 ppb
2017-09-12204475GE30.7 ppb
2017-09-12204485GE25.2 ppb
2017-09-12204487GE28.5 ppb
2017-09-12204479GE1.70 ppb
2017-09-13204481GE17.2 ppb
2017-09-13204483GE17.6 ppb
2017-09-13204477GE30.1 ppb
2017-12-11208504GE22.4 ppb
2017-12-11208506GE3.70 ppb
2017-12-12208500GE16.8 ppb
2017-12-12208502GE11.5 ppb
2017-12-12208508GE24.0 ppb
2017-12-12208510GE21.3 ppb
2017-12-12208512GE16.5 ppb
2017-12-12208514GE19.8 ppb
2018-03-14211585GE23.7 ppb
2018-03-14211587GE21.2 ppb
2018-03-14211589GE25.7 ppb
2018-03-14211591GE14.3 ppb
2018-03-14211599GE26.7 ppb
2018-03-15211593GE19.5 ppb
2018-03-15211595GE28.6 ppb
2018-03-15211597GE25.1 ppb
2018-06-19215737GE19.8 ppb
2018-06-19215739GE25.9 ppb
2018-06-19215743GE4.40 ppb
2018-06-19215745GE21.6 ppb
2018-06-19215751GE22.7 ppb
2018-06-20215747GE29.4 ppb
2018-06-20215749GE16.0 ppb
2018-06-20215741GE20.4 ppb
2018-09-14DBP 20050548417.4 ppb
2018-09-14DBP 20050548626.0 ppb
2018-09-14DBP 20050549113.9 ppb
2018-09-14DBP 20050549315.1 ppb
2018-09-14DBP 20050549516.6 ppb
2018-09-14DBP 20050549716.3 ppb
2018-09-14DBP 20050549911.2 ppb
2018-09-17DBP 200505658ND
2018-12-14DBP 20051609323.1 ppb
2018-12-14DBP 20051609412.5 ppb
2018-12-14DBP 20051609517.0 ppb
2018-12-14DBP 2005160962.10 ppb
2018-12-14DBP 20051609724.3 ppb
2018-12-14DBP 20051609816.9 ppb
2018-12-14DBP 20051609927.3 ppb
2018-12-14DBP 20051610023.7 ppb
2019-03-14DBP 20052476021.9 ppb
2019-03-14DBP 20052476115.2 ppb
2019-03-14DBP 20052476218.1 ppb
2019-03-14DBP 20052476315.3 ppb
2019-03-14DBP 20052476418.0 ppb
2019-03-14DBP 20052476528.5 ppb
2019-03-14DBP 20052476628.1 ppb
2019-03-14DBP 20052476722.0 ppb
2019-06-20DBP 20053726514.4 ppb
2019-06-20DBP 20053726616.3 ppb
2019-06-20DBP 20053726715.1 ppb
2019-06-20DBP 2005372681.10 ppb
2019-06-20DBP 20053726917.2 ppb
2019-06-20DBP 20053727026.9 ppb
2019-06-20DBP 20053727111.9 ppb
2019-06-20DBP 20053727219.5 ppb
2019-09-19DBP 200549612ND
2019-09-19DBP 20054961339.8 ppb
2019-09-19DBP 2005496151.80 ppb
2019-09-19DBP 20054961712.7 ppb
2019-09-19DBP 20054961810.2 ppb
2019-10-11DBP 20055250315.1 ppb
2019-10-11DBP 20055250414.8 ppb
2019-10-11DBP 20055250517.5 ppb
2019-12-19DBP 20056092612.8 ppb
2019-12-19DBP 20056092711.8 ppb
2019-12-19DBP 20056092911.8 ppb
2019-12-19DBP 20056093021.2 ppb
2019-12-19DBP 20056093118.6 ppb
2019-12-19DBP 2005609327.00 ppb
2019-12-19DBP 20056093415.8 ppb
2019-12-19DBP 20056093515.5 ppb