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EWG's Tap Water Database — 2021 UPDATE

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Haloacetic acids (HAA5)

Grand Prairie Bayou 2 PWA

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

 

59

Samples

0

Samples exceeding legal limit (MCL)

9

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20141.52 ppb165ND - 11.0 ppb
20150.700 ppb81ND - 5.60 ppb
2016ND80ND
2017ND80ND
2018ND90ND
20191.87 ppb103ND - 8.20 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
2014-01-1314016002001ND
2014-01-1314016001901ND
2014-01-1314016002101ND
2014-01-1314016002201ND
2014-04-0214093007601ND
2014-04-02140930075013.10 ppb
2014-04-0214093007701ND
2014-04-0214093007401ND
2014-07-0114184002201ND
2014-07-0114184002401ND
2014-07-0114184002501ND
2014-07-0114184002301ND
2014-10-07142820020017.90 ppb
2014-10-07142820021011.20 ppb
2014-10-071428200230111.0 ppb
2014-10-07142820026011.10 ppb
2015-01-0515008013601ND
2015-01-0515008013701ND
2015-04-0115092008001ND
2015-04-01150920079015.60 ppb
2015-07-2115204006001ND
2015-07-2115204005901ND
2015-10-0615281005901ND
2015-10-0615281006001ND
2016-01-0516008000801ND
2016-01-0516008000901ND
2016-04-0516098002101ND
2016-04-0516098002001ND
2016-07-0616189015901ND
2016-07-0616189015801ND
2016-10-0416279001501ND
2016-10-0416279001401ND
2017-01-0417005015501ND
2017-01-0417005015601ND
2017-04-0417095002301ND
2017-04-0417095002401ND
2017-07-0417187005701ND
2017-07-0417187005801ND
2017-10-0217278004101ND
2017-10-0217278004201ND
2018-01-0318004010801ND
2018-01-0318004010701ND
2018-04-0418095013401ND
2018-05-1618137002701ND
2018-05-1618137002801ND
2018-07-0418186015001ND
2018-07-0418186015101ND
2018-10-0118277000101ND
2018-10-0118277000201ND
2019-01-0919010015501ND
2019-01-0919010015601ND
2019-02-1219045004501ND
2019-02-1219045004601ND
2019-04-0219095000701ND
2019-04-0219095000601ND
2019-08-19192330068013.50 ppb
2019-08-1919233006901ND
2019-10-02192770061017.00 ppb
2019-10-02192770063018.20 ppb