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EWG's Tap Water Database — 2021 UPDATE

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Haloacetic acids (HAA5)

Marine Corps Air Station Cherry Point

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

 

104

Samples

4

Samples exceeding legal limit (MCL)

104

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201429.0 ppb242414.0 ppb - 39.0 ppb
201532.4 ppb161613.0 ppb - 54.0 ppb
201645.9 ppb161632.0 ppb - 61.0 ppb
201741.0 ppb161630.0 ppb - 57.0 ppb
201846.3 ppb161632.0 ppb - 56.0 ppb
201956.1 ppb161639.0 ppb - 77.0 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
2014-03-0692192424003DIS24.0 ppb
2014-03-0692192424004DIS24.0 ppb
2014-03-0692192424005DIS14.0 ppb
2014-03-0692192424006DIS30.0 ppb
2014-03-0692192424003TTH24.0 ppb
2014-03-0692192424004TTH25.0 ppb
2014-03-0692192424005TTH14.0 ppb
2014-03-0692192424006TTH26.0 ppb
2014-06-0592204320001TTH36.0 ppb
2014-06-0592204320002TTH36.0 ppb
2014-06-0592204320003TTH34.0 ppb
2014-06-0592204320004TTH32.0 ppb
2014-06-0592204320001DIS36.0 ppb
2014-06-0592204320002DIS36.0 ppb
2014-06-0592204320003DIS34.0 ppb
2014-06-0592204320004DIS30.0 ppb
2014-09-1992218463001TTH30.0 ppb
2014-09-1992218463002TTH26.0 ppb
2014-09-1992218463003TTH36.0 ppb
2014-09-1992218463004TTH39.0 ppb
2014-12-1192229410001TTH32.0 ppb
2014-12-1192229410002TTH26.0 ppb
2014-12-1192229410003TTH27.0 ppb
2014-12-1192229410004TTH26.0 ppb
2015-03-0535.0 ppb
2015-03-0536.0 ppb
2015-03-0530.0 ppb
2015-03-0528.0 ppb
2015-06-1022.0 ppb
2015-06-1036.0 ppb
2015-06-1027.0 ppb
2015-06-1029.0 ppb
2015-09-0929.0 ppb
2015-09-0939.0 ppb
2015-09-0934.0 ppb
2015-09-0933.0 ppb
2015-12-1513.0 ppb
2015-12-1535.0 ppb
2015-12-1539.0 ppb
2015-12-1554.0 ppb
2016-03-0337729_16-0733254.0 ppb
2016-03-0337729_16-0733361.0 ppb
2016-03-0337729_16-0733442.0 ppb
2016-03-0337729_16-0733532.0 ppb
2016-06-1637729_16-1944141.0 ppb
2016-06-1637729_16-1944644.0 ppb
2016-06-1637729_16-1944743.0 ppb
2016-06-1637729_16-1944845.0 ppb
2016-09-2137729_16-3310532.0 ppb
2016-09-2137729_16-3310860.0 ppb
2016-09-2137729_16-3310956.0 ppb
2016-09-2137729_16-3311049.0 ppb
2016-12-1337729_16-4296436.0 ppb
2016-12-1337729_16-4296954.0 ppb
2016-12-1337729_16-4297043.0 ppb
2016-12-1337729_16-4297142.0 ppb
2017-03-1437729_17-0864450.0 ppb
2017-03-1437729_17-0864657.0 ppb
2017-03-1437729_17-0864742.0 ppb
2017-03-1437729_17-0864848.0 ppb
2017-06-1337729_17-1974030.0 ppb
2017-06-1337729_17-1974439.0 ppb
2017-06-1337729_17-1974537.0 ppb
2017-06-1337729_17-1974631.0 ppb
2017-09-0737729_17-3298740.0 ppb
2017-09-0737729_17-3298947.0 ppb
2017-09-0737729_17-3299047.0 ppb
2017-09-0737729_17-3299141.0 ppb
2017-12-1237729_17-4753933.0 ppb
2017-12-1237729_17-4754043.0 ppb
2017-12-1237729_17-4754137.0 ppb
2017-12-1237729_17-4754234.0 ppb
2018-03-2337729_18-11525 41.0 ppb
2018-03-2337729_18-11526 43.0 ppb
2018-03-2337729_18-11527 46.0 ppb
2018-03-2337729_18-11528 40.0 ppb
2018-06-1537729_18-24324 53.0 ppb
2018-06-1537729_18-24325 53.0 ppb
2018-06-1537729_18-24326 40.0 ppb
2018-06-1537729_18-24327 49.0 ppb
2018-09-2437729_18-39158 50.0 ppb
2018-09-2437729_18-39159 56.0 ppb
2018-09-2437729_18-39160 49.0 ppb
2018-09-2437729_18-39161 55.0 ppb
2018-12-1237729_18-52088 43.0 ppb
2018-12-1237729_18-52089 44.0 ppb
2018-12-1237729_18-52090 32.0 ppb
2018-12-1237729_18-52091 47.0 ppb
2019-03-0737729_19-09862 60.0 ppb
2019-03-0737729_19-09865 60.0 ppb
2019-03-0737729_19-09866 50.0 ppb
2019-03-0737729_19-09867 50.0 ppb
2019-06-0337729_19-22575 47.0 ppb
2019-06-0337729_19-22591 50.0 ppb
2019-06-0337729_19-22592 39.0 ppb
2019-06-0337729_19-22593 42.0 ppb
2019-09-1837729_19-40750 68.0 ppb
2019-09-1837729_19-40754 60.0 ppb
2019-09-1837729_19-40755 52.0 ppb
2019-09-1837729_19-40756 59.0 ppb
2019-12-1837729_19-54304 75.0 ppb
2019-12-1837729_19-54309 77.0 ppb
2019-12-1837729_19-54310 51.0 ppb
2019-12-1837729_19-54311 57.0 ppb