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EWG's Tap Water Database — 2019 UPDATE

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Haloacetic acids (HAA5)

Chelan County PUD 1

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.

 

43

Samples

0

Samples exceeding legal limit (MCL)

21

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20122.80 ppb112.80 ppb
20134.30 ppb114.30 ppb
20140.869 ppb135ND - 5.10 ppb
20150.375 ppb123ND - 2.40 ppb
20161.76 ppb129ND - 4.10 ppb
20170.925 ppb42ND - 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
2012-07-17814432.80 ppb
2013-08-07824554.30 ppb
2014-05-2183123ND
2014-05-21831201.30 ppb
2014-05-2183121ND
2014-05-2183122ND
2014-08-19834635.10 ppb
2014-08-1983462ND
2014-08-20834681.30 ppb
2014-08-20834672.50 ppb
2014-08-2083464ND
2014-10-16837491.10 ppb
2014-10-1683751ND
2014-10-1683752ND
2014-10-1683750ND
2015-03-1884048ND
2015-03-1884049ND
2015-03-1884047ND
2015-03-1884046ND
2015-04-2284140ND
2015-04-2284142ND
2015-04-2284141ND
2015-04-2284143ND
2015-10-07846481.000 ppb
2015-10-0784650ND
2015-10-07846512.40 ppb
2015-10-07846491.10 ppb
2016-04-27ND
2016-04-27ND
2016-04-274.10 ppb
2016-04-271.20 ppb
2016-07-13ND
2016-07-133.60 ppb
2016-07-132.40 ppb
2016-07-133.30 ppb
2016-12-011.40 ppb
2016-12-012.60 ppb
2016-12-011.30 ppb
2016-12-011.20 ppb
2017-01-23ND
2017-01-231.20 ppb
2017-01-232.50 ppb
2017-01-23ND