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EWG's Tap Water Database — 2021 UPDATE

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Haloacetic acids (HAA5)

Tupper Plains/Chester Water District

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.

 

20

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND100ND
2015ND20ND
2016ND20ND
2017ND20ND
2018ND20ND
2019ND20ND

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
2014-03-06A140190724ND
2014-03-06A140190723ND
2014-03-06A140190722ND
2014-03-06A140190721ND
2014-06-05A140191617ND
2014-06-05A140191619ND
2014-06-05A140191618ND
2014-06-05A140191616ND
2014-09-11A140217165ND
2014-09-11A140217164ND
2015-08-12A150310856ND
2015-08-12A150310857ND
2016-07-27A160399437ND
2016-07-27A160399438ND
2017-08-24A170516683ND
2017-08-24A170516684ND
2018-09-12A180626787ND
2018-09-12A180632144ND
2019-08-139H02729-01ND
2019-08-139H02729-02ND