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EWG's Tap Water Database — 2021 UPDATE

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Haloacetic acids (HAA5)

San Gabriel Valley Water Company- El Monte

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

 

143

Samples

0

Samples exceeding legal limit (MCL)

33

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.104 ppb242ND - 1.30 ppb
20150.543 ppb236ND - 5.50 ppb
20160.321 ppb246ND - 1.60 ppb
20170.408 ppb247ND - 1.80 ppb
20180.300 ppb245ND - 2.00 ppb
20190.438 ppb247ND - 1.90 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
2014-01-309588-800-0840ND
2014-01-309588-801-0945ND
2014-01-309588-802-0920ND
2014-01-309588-803-1020ND
2014-01-309588-804-1005ND
2014-01-309588-805-0940ND
2014-04-299588-800-0850ND
2014-04-299588-801-0915ND
2014-04-299588-802-0935ND
2014-04-299588-803-0955ND
2014-04-299588-804-10151.20 ppb
2014-04-299588-805-1005ND
2014-07-309588-800-0910ND
2014-07-309588-801-1030ND
2014-07-309588-802-1010ND
2014-07-309588-803-1050ND
2014-07-309588-804-11101.30 ppb
2014-07-309588-805-1040ND
2014-10-309588-800-0815ND
2014-10-309588-801-0920ND
2014-10-309588-802-0855ND
2014-10-309588-803-0940ND
2014-10-309588-804-1000ND
2014-10-309588-805-1040ND
2015-01-279588-800-0800ND
2015-01-279588-801-0855ND
2015-01-279588-802-0830ND
2015-01-279588-803-0915ND
2015-01-279588-804-09351.10 ppb
2015-01-279588-805-1020ND
2015-04-279588-800-0730ND
2015-04-279588-801-0830ND
2015-04-279588-802-0810ND
2015-04-279588-803-0845ND
2015-04-279588-804-09101.20 ppb
2015-04-279588-805-13051.80 ppb
2015-07-309588-800-0745ND
2015-07-309588-801-0810ND
2015-07-309588-802-0830ND
2015-07-309588-803-0925ND
2015-07-309588-804-09401.60 ppb
2015-07-309588-805-10485.50 ppb
2015-10-279588-800-0800ND
2015-10-279588-801-0906ND
2015-10-279588-802-0835ND
2015-10-279588-803-0915ND
2015-10-279588-804-09351.30 ppb
2016-01-279588-800-0750ND
2016-01-279588-801-0850ND
2016-01-279588-802-0825ND
2016-01-279588-803-0905ND
2016-01-279588-804-09201.20 ppb
2016-01-279588-805-0820ND
2016-04-269588-800-0830ND
2016-04-269588-801-0855ND
2016-04-269588-802-0920ND
2016-04-269588-803-0935ND
2016-04-269588-804-09551.000 ppb
2016-04-269588-805-09151.10 ppb
2016-07-279588-800-0835ND
2016-07-279588-801-0950ND
2016-07-279588-802-0925ND
2016-07-279588-803-1015ND
2016-07-279588-804-10301.40 ppb
2016-07-279588-805-10001.60 ppb
2016-10-279588-800-0830ND
2016-10-279588-801-0940ND
2016-10-279588-802-0915ND
2016-10-279588-803-1020ND
2016-10-279588-804-10001.40 ppb
2016-10-279588-805-1315ND
2017-01-269588-800-0800ND
2017-01-269588-801-0845ND
2017-01-269588-802-0820ND
2017-01-269588-803-0905ND
2017-01-269588-804-09201.20 ppb
2017-01-269588-805-09381.30 ppb
2017-04-269588-800-0800ND
2017-04-269588-801-0855ND
2017-04-269588-802-0830ND
2017-04-269588-803-0910ND
2017-04-269588-804-0930ND
2017-04-289588-805-12001.40 ppb
2017-07-269588-800-0810ND
2017-07-269588-801-0945ND
2017-07-269588-802-0920ND
2017-07-269588-803-1000ND
2017-07-269588-804-10251.20 ppb
2017-07-269588-805-10481.80 ppb
2017-10-269588-800-0745ND
2017-10-269588-801-0850ND
2017-10-269588-802-0830ND
2017-10-269588-803-0910ND
2017-10-269588-804-09301.30 ppb
2017-10-269588-805-13131.60 ppb
2018-01-299588-800-0730ND
2018-01-299588-801-0900ND
2018-01-299588-802-0810ND
2018-01-299588-803-1230ND
2018-01-299588-804-12151.10 ppb
2018-01-299588-805-1207ND
2018-04-269588-800-0730ND
2018-04-269588-801-0840ND
2018-04-269588-802-0820ND
2018-04-269588-803-1220ND
2018-04-269588-804-12001.40 ppb
2018-04-269588-805-1215ND
2018-07-269588-800-0740ND
2018-07-269588-801-0900ND
2018-07-269588-802-0830ND
2018-07-269588-803-1140ND
2018-07-269588-804-1130ND
2018-07-269588-805-13482.00 ppb
2018-10-259588-800-0835ND
2018-10-259588-801-0950ND
2018-10-259588-802-0915ND
2018-10-259588-803-1310ND
2018-10-259588-804-12451.50 ppb
2018-10-259588-805-13401.20 ppb
2019-01-289588-800-0730ND
2019-01-289588-801-0830ND
2019-01-289588-802-0810ND
2019-01-289588-803-1150ND
2019-01-289588-804-11351.10 ppb
2019-01-289588-805-1225ND
2019-04-269588-800-0820ND
2019-04-269588-801-0915ND
2019-04-269588-802-0845ND
2019-04-269588-803-0930ND
2019-04-269588-804-09451.60 ppb
2019-04-269588-805-13101.50 ppb
2019-07-269588-800-0755ND
2019-07-269588-801-0900ND
2019-07-269588-802-0840ND
2019-07-269588-803-0915ND
2019-07-269588-804-09351.50 ppb
2019-07-269588-805-09401.40 ppb
2019-10-289588-800-0755ND
2019-10-289588-801-0855ND
2019-10-289588-802-0830ND
2019-10-289588-803-0920ND
2019-10-289588-804-09401.50 ppb
2019-10-289588-805-12251.90 ppb