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EWG's Tap Water Database — 2021 UPDATE

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Haloacetic acids (HAA5)

Fort Bend County Municipal Utility District 112

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.

 

36

Samples

0

Samples exceeding legal limit (MCL)

4

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND10ND
2015ND10ND
2016ND10ND
2017ND10ND
20180.0688 ppb161ND - 1.10 ppb
20191.09 ppb163ND - 9.20 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
2014-06-03AC55796ND
2015-07-16AC99939ND
2016-09-13AD49175ND
2017-07-11AD88885ND
2018-02-05AE12166ND
2018-02-05AE12180ND
2018-02-05AE12169ND
2018-02-05AE12163ND
2018-04-10AE21880ND
2018-04-10AE21856ND
2018-04-10AE21871ND
2018-04-10AE21873ND
2018-08-14AE36847ND
2018-08-14AE368421.10 ppb
2018-08-14AE36849ND
2018-08-14AE36848ND
2018-10-01AE42215ND
2018-10-01AE42208ND
2018-10-01AE42213ND
2018-10-01AE42207ND
2019-01-23AE50925ND
2019-01-23AE509185.10 ppb
2019-01-23AE50917ND
2019-01-23AE50916ND
2019-04-08AE61332ND
2019-04-08AE61350ND
2019-04-08AE61357ND
2019-04-08AE613389.20 ppb
2019-07-08AE73420ND
2019-07-08AE73407ND
2019-07-08AE73405ND
2019-07-08AE73412ND
2019-10-09AE86116ND
2019-10-09AE86111ND
2019-10-09AE861153.20 ppb
2019-10-09AE86112ND