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EWG's Tap Water Database — 2021 UPDATE

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Haloacetic acids (HAA5)

Montgomery Trace Water 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

 

77

Samples

0

Samples exceeding legal limit (MCL)

33

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND10ND
20150.392 ppb121ND - 4.70 ppb
201613.1 ppb169ND - 51.8 ppb
201714.1 ppb169ND - 52.9 ppb
20183.19 ppb166ND - 18.2 ppb
20193.13 ppb168ND - 20.7 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
2014-06-25AC58014ND
2015-05-29AC93987ND
2015-05-29AC94014ND
2015-05-29AC94021ND
2015-05-29AC94012ND
2015-07-23AD00863ND
2015-07-23AD008874.70 ppb
2015-07-23AD00860ND
2015-07-23AD00890ND
2015-10-13AD10456ND
2015-10-13AD10457ND
2015-10-13AD10451ND
2015-10-13AD10454ND
2016-01-11AD173094.80 ppb
2016-01-11AD17308ND
2016-01-11AD173104.70 ppb
2016-01-11AD173076.20 ppb
2016-06-20AD41130ND
2016-06-20AD41140ND
2016-06-20AD4112813.2 ppb
2016-06-20AD41129ND
2016-07-27AD45927ND
2016-07-27AD45924ND
2016-07-27AD459235.80 ppb
2016-07-27AD45922ND
2016-12-12AD6160051.8 ppb
2016-12-12AD6160144.1 ppb
2016-12-12AD6160335.7 ppb
2016-12-12AD6159942.6 ppb
2017-01-23AD6602352.9 ppb
2017-01-23AD6602249.6 ppb
2017-01-23AD6602149.3 ppb
2017-01-23AD6602551.5 ppb
2017-05-17AD84596ND
2017-05-17AD846011.20 ppb
2017-05-17AD845943.80 ppb
2017-05-17AD84593ND
2017-07-13AD89193ND
2017-07-13AD89201ND
2017-07-13AD892025.10 ppb
2017-07-13AD891941.20 ppb
2017-11-29AE06100ND
2017-11-29AE06097ND
2017-11-29AE0609811.4 ppb
2017-11-29AE06099ND
2018-02-20AE143731.10 ppb
2018-02-20AE1439910.7 ppb
2018-02-20AE143861.20 ppb
2018-02-20AE14377ND
2018-06-14AE30010ND
2018-06-14AE30005ND
2018-06-14AE299988.40 ppb
2018-06-14AE30004ND
2018-08-23AE38398ND
2018-08-23AE38375ND
2018-08-23AE3837611.5 ppb
2018-08-23AE38396ND
2018-11-05AE45235ND
2018-11-05AE45237ND
2018-11-05AE4523618.2 ppb
2018-11-05AE45234ND
2019-01-16AE50077ND
2019-01-16AE500891.30 ppb
2019-01-16AE5007820.7 ppb
2019-01-16AE50076ND
2019-04-16AE62536ND
2019-04-16AE62534ND
2019-04-16AE625331.000 ppb
2019-04-16AE62535ND
2019-07-01AE72828ND
2019-07-01AE72827ND
2019-07-01AE728291.50 ppb
2019-07-01AE72830ND
2019-10-17AE868999.80 ppb
2019-10-17AE8689810.5 ppb
2019-10-17AE868954.30 ppb
2019-10-17AE868961.000 ppb