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EWG's Tap Water Database — 2019 UPDATE

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Haloacetic acids (HAA5)

East Wenatchee 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.

 

33

Samples

0

Samples exceeding legal limit (MCL)

19

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND10ND
20130.510 ppb42ND - 1.03 ppb
20140.653 ppb168ND - 2.17 ppb
20150.910 ppb86ND - 1.39 ppb
20160.785 ppb43ND - 1.07 ppb
20171.85 ppb221.20 ppb - 2.50 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 on-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
2012-11-1378237ND
2013-10-09907011.03 ppb
2013-10-09907001.01 ppb
2013-10-0990699ND
2013-10-0990702ND
2014-01-1593889ND
2014-01-1593890ND
2014-01-15938911.36 ppb
2014-01-15938921.20 ppb
2014-04-2296867ND
2014-04-22968681.07 ppb
2014-04-2296866ND
2014-04-22968691.23 ppb
2014-07-10000281.07 ppb
2014-07-10000292.17 ppb
2014-07-1000031ND
2014-07-10000301.27 ppb
2014-10-14538581.07 ppb
2014-10-1453861ND
2014-10-1453860ND
2014-10-1453859ND
2015-01-21565991.25 ppb
2015-01-2156600ND
2015-01-21565981.19 ppb
2015-01-2156596ND
2015-04-21593301.38 ppb
2015-04-21593311.05 ppb
2015-04-21593331.39 ppb
2015-04-21593321.02 ppb
2016-08-16ND
2016-08-161.06 ppb
2016-08-161.07 ppb
2016-08-161.01 ppb