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EWG's Tap Water Database — 2021 UPDATE

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Haloacetic acids (HAA5)

CTWC - Unionville System

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

 

103

Samples

0

Samples exceeding legal limit (MCL)

99

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
201422.9 ppb2320ND - 43.0 ppb
201522.8 ppb16166.60 ppb - 34.0 ppb
201621.1 ppb16166.40 ppb - 42.0 ppb
201715.8 ppb1615ND - 30.0 ppb
201834.1 ppb161619.0 ppb - 43.8 ppb
201928.8 ppb16168.10 ppb - 48.6 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
2014-01-22BG02299HAA57.00 ppb
2014-01-23BG02294HAA5ND
2014-01-23BG02295HAA532.0 ppb
2014-01-23BG02296HAA5ND
2014-01-23BG02297HAA521.0 ppb
2014-01-23BG02298HAA5ND
2014-01-23BG02300HAA54.50 ppb
2014-01-31BG06715HAA540.0 ppb
2014-01-31BG06716HAA543.0 ppb
2014-01-31BG06717HAA519.0 ppb
2014-01-31BG06718HAA530.0 ppb
2014-04-22BG36625HAA531.0 ppb
2014-04-22BG36626HAA531.0 ppb
2014-04-22BG36627HAA533.0 ppb
2014-04-22BG36628HAA528.0 ppb
2014-07-22BG81008HAA540.0 ppb
2014-07-22BG81009HAA540.0 ppb
2014-07-22BG81010HAA530.0 ppb
2014-07-22BG81011HAA520.0 ppb
2014-10-22BH31458HAA520.0 ppb
2014-10-22BH31459HAA521.0 ppb
2014-10-22BH31460HAA519.0 ppb
2014-10-22BH31461HAA518.0 ppb
2015-01-21BH66106HAA520.0 ppb
2015-01-21BH66103HAA520.0 ppb
2015-01-21BH66105HAA527.0 ppb
2015-01-21BH66104HAA526.0 ppb
2015-04-27BJ08473HAA534.0 ppb
2015-04-27BJ08472HAA533.0 ppb
2015-04-28BJ08474HAA523.0 ppb
2015-04-28BJ08471HAA532.0 ppb
2015-07-20BJ60685HAA523.0 ppb
2015-07-20BJ60682HAA525.0 ppb
2015-07-20BJ60684HAA524.0 ppb
2015-07-21BJ60686HAA56.60 ppb
2015-10-05BK02873HAA517.0 ppb
2015-10-05BK02871HAA519.0 ppb
2015-10-06BK02872HAA520.0 ppb
2015-10-20BK11417HAA515.0 ppb
2016-01-11BK51263HAA521.0 ppb
2016-01-11BK51264HAA520.0 ppb
2016-01-11BK51265HAA518.0 ppb
2016-01-18BK54312HAA56.40 ppb
2016-04-18BN15772HAA525.0 ppb
2016-04-18BN15773HAA519.0 ppb
2016-04-18BN15774HAA525.0 ppb
2016-04-18BN15775HAA517.0 ppb
2016-07-12BN71240HAA530.0 ppb
2016-07-12BN71241HAA517.0 ppb
2016-07-13BN72150HAA542.0 ppb
2016-07-13BN72151HAA521.0 ppb
2016-10-04BV35900HAA520.0 ppb
2016-10-04BV35901HAA514.4 ppb
2016-10-04BV35905HAA517.0 ppb
2016-10-11BV44240HAA525.0 ppb
2017-01-17BX30317HAA515.8 ppb
2017-01-17BX30318HAA514.5 ppb
2017-01-17BX30319HAA516.1 ppb
2017-01-17BX30320HAA517.1 ppb
2017-04-11BY02319HAA518.4 ppb
2017-04-11BY02320HAA513.0 ppb
2017-04-11BY02321HAA520.0 ppb
2017-04-11BY02322HAA525.0 ppb
2017-07-18BY63323HAA530.0 ppb
2017-07-18BY63324HAA5ND
2017-07-18BY63325HAA528.0 ppb
2017-07-18BY63326HAA524.0 ppb
2017-10-24BZ26033HAA55.30 ppb
2017-10-24BZ26034HAA56.90 ppb
2017-10-24BZ26035HAA517.0 ppb
2017-10-24BZ26036HAA51.40 ppb
2018-01-16BZ73286HAA537.0 ppb
2018-01-16BZ73287HAA532.0 ppb
2018-01-16BZ73288HAA537.0 ppb
2018-01-16BZ73289HAA537.0 ppb
2018-04-27CA37381HAA530.0 ppb
2018-04-27CA37382HAA536.0 ppb
2018-04-27CA37383HAA539.0 ppb
2018-04-27CA37384HAA538.0 ppb
2018-07-24CA9673438.0 ppb
2018-07-24CA9673539.0 ppb
2018-07-24CA9673633.0 ppb
2018-07-24CA9673719.0 ppb
2018-10-02DBP 20050766543.8 ppb
2018-10-02DBP 20050766627.5 ppb
2018-10-02DBP 20050766728.5 ppb
2018-10-02DBP 20050802031.4 ppb
2019-01-08DBP 20051813048.6 ppb
2019-01-08DBP 20051813626.5 ppb
2019-01-08DBP 20051813941.4 ppb
2019-01-08DBP 20051814336.8 ppb
2019-04-09DBP 20052784614.2 ppb
2019-04-09DBP 2005278478.10 ppb
2019-04-09DBP 20052784845.3 ppb
2019-04-09DBP 20052784910.6 ppb
2019-07-02DBP 20053898636.8 ppb
2019-07-02DBP 20053898728.1 ppb
2019-07-02DBP 20053898830.4 ppb
2019-07-02DBP 20053898940.8 ppb
2019-10-08DBP 20055201225.5 ppb
2019-10-08DBP 20055201327.5 ppb
2019-10-08DBP 20055201419.2 ppb
2019-10-08DBP 20055201520.4 ppb