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EWG's Tap Water Database — 2021 UPDATE

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Haloacetic acids (HAA5)

Lackland Air Force Base

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

 

96

Samples

0

Samples exceeding legal limit (MCL)

32

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.213 ppb163ND - 1.30 ppb
20150.425 ppb165ND - 2.30 ppb
20160.506 ppb166ND - 2.10 ppb
20170.513 ppb165ND - 2.70 ppb
20181.50 ppb168ND - 6.30 ppb
20190.338 ppb165ND - 1.20 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
2014-02-14AC43077ND
2014-02-14AC43066ND
2014-02-14AC43078ND
2014-02-14AC43063ND
2014-04-09AC50025ND
2014-04-09AC50044ND
2014-04-09AC50030ND
2014-04-09AC50026ND
2014-07-21AC603871.10 ppb
2014-07-21AC603611.000 ppb
2014-07-21AC603711.30 ppb
2014-07-21AC60368ND
2014-12-19AC75643ND
2014-12-19AC75644ND
2014-12-19AC75640ND
2014-12-19AC75642ND
2015-02-27AC82302ND
2015-02-27AC823271.000 ppb
2015-02-27AC82295ND
2015-02-27AC82304ND
2015-06-24AC97206ND
2015-06-24AC972141.10 ppb
2015-06-24AC97205ND
2015-06-24AC972091.20 ppb
2015-08-20AD04780ND
2015-08-20AD047881.20 ppb
2015-08-20AD04779ND
2015-08-20AD04791ND
2015-11-18AD13986ND
2015-11-18AD139872.30 ppb
2015-11-18AD13988ND
2015-11-18AD13989ND
2016-03-08AD27526ND
2016-03-08AD27521ND
2016-03-08AD275221.10 ppb
2016-03-08AD27523ND
2016-06-22AD41495ND
2016-06-22AD414871.30 ppb
2016-06-22AD414851.20 ppb
2016-06-22AD41507ND
2016-09-21AD50494ND
2016-09-21AD504952.10 ppb
2016-09-21AD504931.10 ppb
2016-09-21AD50497ND
2016-12-12AD61649ND
2016-12-12AD61642ND
2016-12-12AD616451.30 ppb
2016-12-12AD61648ND
2017-03-02AD73081ND
2017-03-02AD730791.10 ppb
2017-03-02AD73067ND
2017-03-02AD73084ND
2017-04-11AD79174ND
2017-04-11AD791731.10 ppb
2017-04-11AD79172ND
2017-04-11AD791712.70 ppb
2017-08-10AD92713ND
2017-08-10AD92739ND
2017-08-10AD927122.10 ppb
2017-08-10AD92738ND
2017-12-08AE07408ND
2017-12-08AE074071.20 ppb
2017-12-08AE07406ND
2017-12-08AE07405ND
2018-01-19AE09495ND
2018-01-19AE094931.000 ppb
2018-01-19AE09494ND
2018-01-19AE09496ND
2018-04-11AE220023.00 ppb
2018-04-11AE22000ND
2018-04-11AE22001ND
2018-04-11AE220036.30 ppb
2018-07-30AE34851ND
2018-07-30AE348482.50 ppb
2018-07-30AE348493.80 ppb
2018-07-30AE348451.000 ppb
2018-10-17AE43912ND
2018-10-17AE439151.90 ppb
2018-10-17AE439144.50 ppb
2018-10-17AE43918ND
2019-01-25AE515751.10 ppb
2019-01-25AE51576ND
2019-01-25AE51581ND
2019-01-25AE51578ND
2019-04-11AE62026ND
2019-04-11AE62025ND
2019-04-11AE62021ND
2019-04-11AE62024ND
2019-08-06AE77206ND
2019-08-06AE77199ND
2019-08-06AE772011.20 ppb
2019-08-06AE77218ND
2019-10-23AE87375ND
2019-10-23AE873961.000 ppb
2019-10-23AE874091.10 ppb
2019-10-23AE873901.000 ppb