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EWG's Tap Water Database — 2019 UPDATE

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Haloacetic acids (HAA5)

Cal-am Water Company - Duarte

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.

 

68

Samples

0

Samples exceeding legal limit (MCL)

37

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012N/A00N/A
20130.300 ppb41ND - 1.20 ppb
20140.288 ppb164ND - 1.30 ppb
20150.644 ppb166ND - 3.40 ppb
20161.14 ppb1613ND - 2.20 ppb
20171.43 ppb1613ND - 3.70 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
2013-10-319588-801-1015ND
2013-10-319588-800-10401.20 ppb
2013-10-319588-802-1025ND
2013-10-319588-803-0830ND
2014-01-319588-800-0755ND
2014-01-319588-801-0820ND
2014-01-319588-802-0810ND
2014-01-319588-803-0740ND
2014-04-309588-802-0925ND
2014-04-309588-803-0800ND
2014-04-309588-801-0935ND
2014-04-309588-800-0910ND
2014-07-319588-802-1210ND
2014-07-319588-803-1125ND
2014-07-319588-801-1200ND
2014-07-319588-800-1145ND
2014-10-319588-802-09451.000 ppb
2014-10-319588-801-09551.000 ppb
2014-10-319588-803-10301.30 ppb
2014-10-319588-800-09351.30 ppb
2015-01-299588-802-08301.10 ppb
2015-01-299588-803-07303.40 ppb
2015-01-299588-801-08401.000 ppb
2015-01-299588-800-08201.10 ppb
2015-04-309588-803-10451.40 ppb
2015-04-309588-800-0750ND
2015-04-309588-801-0730ND
2015-04-309588-802-0740ND
2015-07-319588-802-0840ND
2015-07-319588-800-0830ND
2015-07-319588-801-0850ND
2015-07-319588-803-0730ND
2015-10-299588-802-0850ND
2015-10-299588-800-0840ND
2015-10-299588-801-0900ND
2015-10-299588-803-07302.30 ppb
2016-01-289588-802-08501.70 ppb
2016-01-289588-800-08401.50 ppb
2016-01-289588-803-07401.90 ppb
2016-01-289588-801-09001.40 ppb
2016-04-289588-802-09051.20 ppb
2016-04-289588-803-07552.20 ppb
2016-04-289588-800-08501.30 ppb
2016-04-289588-801-0915ND
2016-07-289588-801-09001.000 ppb
2016-07-289588-800-08401.20 ppb
2016-07-289588-802-08401.10 ppb
2016-07-289588-803-07301.50 ppb
2016-10-289588-801-0855ND
2016-10-289588-802-08451.10 ppb
2016-10-289588-803-0735ND
2016-10-289588-800-08351.20 ppb
2017-01-309588-801-08501.10 ppb
2017-01-309588-802-0840ND
2017-01-309588-803-07302.50 ppb
2017-01-309588-800-08301.30 ppb
2017-04-289588-801-0900ND
2017-04-289588-802-08501.40 ppb
2017-04-289588-803-07302.00 ppb
2017-04-289588-800-08401.70 ppb
2017-07-319588-801-15351.20 ppb
2017-07-319588-802-1550ND
2017-07-319588-800-16051.20 ppb
2017-07-319588-803-15153.70 ppb
2017-10-319588-800-08551.90 ppb
2017-10-319588-802-09051.40 ppb
2017-10-319588-803-07402.20 ppb
2017-10-319588-801-09251.20 ppb