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EWG's Tap Water Database — 2021 UPDATE

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Haloacetic acids (HAA5)

Daphne

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)

2

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014ND160ND
2015ND160ND
2016ND160ND
2017ND160ND
20180.0938 ppb161ND - 1.50 ppb
20190.0938 ppb161ND - 1.50 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
2014-01-13140114014-4ND
2014-01-13140114014-1ND
2014-01-13140114014-3ND
2014-01-13140114014-2ND
2014-04-17140418029-3ND
2014-04-17140418029-4ND
2014-04-17140418029-1ND
2014-04-17140418029-2ND
2014-07-14140715014-4ND
2014-07-14140715014-3ND
2014-07-14140715014-2ND
2014-07-14140715014-1ND
2014-10-16141017021-3ND
2014-10-16141017021-2ND
2014-10-16141017021-1ND
2014-10-16141017021-4ND
2015-01-12150114120-4ND
2015-01-12150114120-3ND
2015-01-12150114120-2ND
2015-01-12150114120-1ND
2015-04-13150415041-3ND
2015-04-13150415041-4ND
2015-04-13150415041-1ND
2015-04-13150415041-2ND
2015-07-16150717035-2ND
2015-07-16150717035-3ND
2015-07-16150717035-4ND
2015-07-16150717035-1ND
2015-10-15151015050-4ND
2015-10-15151015050-1ND
2015-10-15151015050-2ND
2015-10-15151015050-3ND
2016-01-13160114029-4ND
2016-01-13160114029-2ND
2016-01-13160114029-1ND
2016-01-13160114029-3ND
2016-04-13160414038-3ND
2016-04-13160414038-4ND
2016-04-13160414038-2ND
2016-04-13160414038-1ND
2016-07-13160714057-3ND
2016-07-13160714057-4ND
2016-07-13160714057-1ND
2016-07-13160714057-2ND
2016-10-12161013045-4ND
2016-10-12161013045-1ND
2016-10-12161013045-3ND
2016-10-12161013045-2ND
2017-01-12170113033-4ND
2017-01-12170113033-1ND
2017-01-12170113033-3ND
2017-01-12170113033-2ND
2017-04-13170414020-3ND
2017-04-13170414020-2ND
2017-04-13170414020-4ND
2017-04-13170414020-1ND
2017-07-10170713007-1ND
2017-07-10170713007-4ND
2017-07-10170713007-3ND
2017-07-10170713007-2ND
2017-10-12171013002-1ND
2017-10-12171013002-4ND
2017-10-12171013002-2ND
2017-10-12171013002-3ND
2018-01-08180110071-004ND
2018-01-08180110071-003ND
2018-01-08180110071-002ND
2018-01-08180110071-001ND
2018-04-12180413026-2ND
2018-04-12180413026-3ND
2018-04-12180413026-1ND
2018-04-12180413026-4ND
2018-07-1318070412A-0041.50 ppb
2018-07-1318070412A-001ND
2018-07-1318070412A-002ND
2018-07-1318070412A-003ND
2018-10-0818100375-001ND
2018-10-0818100375-003ND
2018-10-0818100375-002ND
2018-10-0818100375-004ND
2019-01-1619010494-001ND
2019-01-1619010494-002ND
2019-01-1619010494-003ND
2019-01-1619010494-004ND
2019-04-0819040356-001ND
2019-04-0819040356-004ND
2019-04-0819040356-003ND
2019-04-0819040356-002ND
2019-07-0820111829004_DBP21.50 ppb
2019-07-0820111829003_DBP2ND
2019-07-0820111829002_DBP2ND
2019-07-0820111829001_DBP2ND
2019-10-1420126103002_DBP2ND
2019-10-1420126103003_DBP2ND
2019-10-1420126103001_DBP2ND
2019-10-1420126103004_DBP2ND