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EWG's Tap Water Database — 2021 UPDATE

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Haloacetic acids (HAA5)

Rehoboth 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.

 

81

Samples

0

Samples exceeding legal limit (MCL)

3

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND90ND
2015ND160ND
2016ND120ND
20170.0917 ppb121ND - 1.10 ppb
20180.0719 ppb161ND - 1.15 ppb
20190.157 ppb161ND - 2.52 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
2014-03-05L4969643-4ND
2014-03-05L4969643-3ND
2014-03-05L4969643-2ND
2014-03-05L4969643-1ND
2014-06-02L5093027-4ND
2014-06-02L5093027-3ND
2014-06-02L5093027-2ND
2014-06-02L5093027-1ND
2014-09-03L5235617-1ND
2015-03-02L5484012-4ND
2015-03-02L5484012-3ND
2015-03-02L5484012-2ND
2015-03-02L5484012-1ND
2015-06-01L5627965-4-HAA5ND
2015-06-01L5627965-3-HAA5ND
2015-06-01L5627965-2-HAA5ND
2015-06-01L5627965-1-HAA5ND
2015-09-09L5810498-2 HAA5ND
2015-09-09L5810498-1 HAA5ND
2015-09-09L5810498-3 HAA5ND
2015-09-09L5810498-4 HAA5ND
2015-12-07L5953521-4 HAA5ND
2015-12-07L5953521-3 HAA5ND
2015-12-07L5953521-2 HAA5ND
2015-12-07L5953521-1 HAA5ND
2016-03-07L6114811-1ND
2016-03-07L6114811-2ND
2016-03-07L6114811-3ND
2016-03-07L6114811-4ND
2016-09-07L6460451-4 HAA5ND
2016-09-07L6460451-3 HAA5ND
2016-09-07L6460451-2 HAA5ND
2016-09-07L6460451-1 HAA5ND
2016-12-052194825004ND
2016-12-052194825003ND
2016-12-052194825002ND
2016-12-052194825001ND
2017-03-062214430002ND
2017-03-062214430003ND
2017-03-062214430004ND
2017-03-062214430001ND
2017-09-05S737151ND
2017-09-05S737147ND
2017-09-05S737143ND
2017-09-05S7371391.10 ppb
2017-12-26L6986762-4 HAA5ND
2017-12-26L6986762-3 HAA5ND
2017-12-26L6986762-2 HAA5ND
2017-12-26L6986762-1 HAA5ND
2018-03-06S7706261.15 ppb
2018-03-06S770614ND
2018-03-06S770618ND
2018-03-06S770622ND
2018-06-04S770835ND
2018-06-04S770808ND
2018-06-04S770804ND
2018-06-04S770752ND
2018-09-05S812291ND
2018-09-05S812295ND
2018-09-05S812309ND
2018-09-05S812299ND
2018-12-05S817023ND
2018-12-05S817019ND
2018-12-05S817015ND
2018-12-05S816974ND
2019-03-04S847947ND
2019-03-04S847943ND
2019-03-04S847939ND
2019-03-04S847935ND
2019-06-03S848073ND
2019-06-03S848061ND
2019-06-03S848065ND
2019-06-03S848069ND
2019-09-03S864711ND
2019-09-03S864707ND
2019-09-03S8647032.52 ppb
2019-09-03S864699ND
2019-12-03S919909ND
2019-12-03S919921ND
2019-12-03S919917ND
2019-12-03S919913ND