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EWG's Tap Water Database — 2021 UPDATE

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Haloacetic acids (HAA5)

Lexington Park

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

 

65

Samples

0

Samples exceeding legal limit (MCL)

29

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014N/A00N/A
20152.00 ppb11ND - 4.80 ppb
20160.363 ppb164ND - 1.80 ppb
20171.59 ppb166ND - 8.60 ppb
20181.09 ppb169ND - 3.60 ppb
20192.66 ppb169ND - 13.5 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
2015-06-012.00 ppb*
2016-02-022121666004ND
2016-02-022121666002ND
2016-02-0221216660031.50 ppb
2016-02-022121666001ND
2016-05-1021426440031.10 ppb
2016-05-102142644002ND
2016-05-102142644001ND
2016-05-102142644004ND
2016-08-0921657850031.40 ppb
2016-08-092165785001ND
2016-08-092165785004ND
2016-08-092165785002ND
2016-11-102189483002ND
2016-11-102189483004ND
2016-11-102189483001ND
2016-11-1021894830031.80 ppb
2017-02-0822084030022.10 ppb
2017-02-132208403001ND
2017-02-132208403004ND
2017-02-1322084030033.80 ppb
2017-05-0822287140048.60 ppb
2017-05-082228714002ND
2017-05-0822287140033.80 ppb
2017-05-082228714001ND
2017-08-042252503002ND
2017-08-042252503004ND
2017-08-042252503001ND
2017-08-0422525030033.10 ppb
2017-11-022274914002ND
2017-11-0222749140034.10 ppb
2017-11-022274914004ND
2017-11-022274914001ND
2018-02-0622936030033.60 ppb
2018-02-062293603002ND
2018-02-062293603001ND
2018-02-062293603004ND
2018-05-0723138140021.000 ppb
2018-05-0723138140011.30 ppb
2018-05-072313814004ND
2018-05-072313814003ND
2018-08-0823314450033.00 ppb
2018-08-082331445002ND
2018-08-0823314450011.10 ppb
2018-08-0823314450041.40 ppb
2018-11-0830008650041.10 ppb
2018-11-0830008650033.30 ppb
2018-11-083000865002ND
2018-11-0830008650011.60 ppb
2019-02-043014792002ND
2019-02-043014792001ND
2019-02-0430147920035.40 ppb
2019-02-043014792004ND
2019-05-023031652004ND
2019-05-0230316520021.40 ppb
2019-05-0230316520031.60 ppb
2019-05-0230316520014.00 ppb
2019-08-0944472-15.00 ppb
2019-08-0944472-44.10 ppb
2019-08-0944472-313.5 ppb
2019-08-0944472-24.90 ppb
2019-11-1845900-1ND
2019-11-1845900-2ND
2019-11-1845900-4ND
2019-11-1845900-32.70 ppb

* Sample result is taken from the system's CCR report.