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EWG's Tap Water Database — 2021 UPDATE

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Haloacetic acids (HAA5)

Fort Bend County WCID 2

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)

49

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20143.61 ppb169ND - 11.0 ppb
20152.66 ppb1610ND - 10.3 ppb
20161.86 ppb167ND - 5.60 ppb
20172.16 ppb168ND - 6.10 ppb
20181.52 ppb167ND - 5.50 ppb
20192.77 ppb168ND - 10.6 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
2014-02-28AC45268ND
2014-02-28AC45275ND
2014-02-28AC45273ND
2014-02-28AC45272ND
2014-04-10AC501815.40 ppb
2014-04-10AC50180ND
2014-04-10AC5018311.0 ppb
2014-04-10AC501978.40 ppb
2014-07-02AC587864.80 ppb
2014-07-02AC587714.90 ppb
2014-07-02AC58784ND
2014-07-02AC587763.60 ppb
2014-10-10AC694838.60 ppb
2014-10-10AC69484ND
2014-10-10AC694946.00 ppb
2014-10-10AC694855.00 ppb
2015-02-04AC792343.20 ppb
2015-02-04AC79225ND
2015-02-04AC79223ND
2015-02-04AC792241.60 ppb
2015-04-07AC874351.30 ppb
2015-04-07AC874331.20 ppb
2015-04-07AC874361.30 ppb
2015-04-07AC87439ND
2015-07-31AD02028ND
2015-07-31AD02033ND
2015-07-31AD020317.30 ppb
2015-07-31AD0202510.3 ppb
2015-10-16AD109906.00 ppb
2015-10-16AD10976ND
2015-10-16AD109754.50 ppb
2015-10-16AD109955.80 ppb
2016-01-27AD203764.60 ppb
2016-01-27AD203824.90 ppb
2016-01-27AD20378ND
2016-01-27AD203851.000 ppb
2016-04-21AD337393.20 ppb
2016-04-21AD33727ND
2016-04-21AD33722ND
2016-04-21AD337215.60 ppb
2016-09-01AD476535.50 ppb
2016-09-01AD47642ND
2016-09-01AD47645ND
2016-09-01AD476805.00 ppb
2016-10-24AD54265ND
2016-10-24AD54266ND
2016-10-24AD54294ND
2016-10-24AD54288ND
2017-01-05AD631754.40 ppb
2017-01-05AD63176ND
2017-01-05AD63177ND
2017-01-05AD631833.90 ppb
2017-04-04AD782794.10 ppb
2017-04-04AD78281ND
2017-04-04AD782784.90 ppb
2017-04-04AD782804.60 ppb
2017-07-07AD88648ND
2017-07-07AD886515.50 ppb
2017-07-07AD88652ND
2017-07-07AD886466.10 ppb
2017-10-10AE00072ND
2017-10-10AE00078ND
2017-10-10AE00076ND
2017-10-10AE000711.000 ppb
2018-01-09AE08324ND
2018-01-09AE08325ND
2018-01-09AE083221.30 ppb
2018-01-09AE083232.90 ppb
2018-04-18AE229723.40 ppb
2018-04-18AE229713.70 ppb
2018-04-18AE229995.50 ppb
2018-04-18AE22964ND
2018-07-19AE33937ND
2018-07-19AE33944ND
2018-07-19AE33943ND
2018-07-19AE33938ND
2018-10-31AE450424.30 ppb
2018-10-31AE45041ND
2018-10-31AE45040ND
2018-10-31AE450393.20 ppb
2019-01-25AE515733.20 ppb
2019-01-25AE515793.80 ppb
2019-01-25AE51577ND
2019-01-25AE515748.70 ppb
2019-04-11AE620016.40 ppb
2019-04-11AE62003ND
2019-04-11AE62000ND
2019-04-11AE619975.60 ppb
2019-07-19AE752311.10 ppb
2019-07-19AE75233ND
2019-07-19AE752324.90 ppb
2019-07-19AE7523010.6 ppb
2019-10-08AE85963ND
2019-10-08AE85961ND
2019-10-08AE85962ND
2019-10-08AE85964ND