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EWG's Tap Water Database — 2019 UPDATE

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Haloacetic acids (HAA5)

San Gabriel County WD

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.

 

92

Samples

0

Samples exceeding legal limit (MCL)

18

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.392 ppb124ND - 1.40 ppb
20130.413 ppb166ND - 1.20 ppb
20140.256 ppb163ND - 1.60 ppb
20150.213 ppb163ND - 1.20 ppb
20160.138 ppb162ND - 1.10 ppb
2017ND160ND

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
2012-04-239588-803-12501.000 ppb
2012-04-239588-801-12301.40 ppb
2012-04-239588-802-1210ND
2012-04-239588-800-1145ND
2012-07-269588-800-0855ND
2012-07-269588-803-11551.10 ppb
2012-07-269588-802-1120ND
2012-07-269588-801-11351.20 ppb
2012-10-239588-803-1255ND
2012-10-239588-800-0945ND
2012-10-239588-801-1315ND
2012-10-239588-802-1350ND
2013-01-239588-801-12301.000 ppb
2013-01-239588-802-1250ND
2013-01-239588-803-11051.10 ppb
2013-01-239588-800-1300ND
2013-04-239588-803-11001.10 ppb
2013-04-239588-800-0910ND
2013-04-239588-801-12301.20 ppb
2013-04-239588-802-0905ND
2013-07-249588-802-1430ND
2013-07-249588-800-1445ND
2013-07-249588-803-1400ND
2013-07-249588-801-1415ND
2013-10-239588-802-0840ND
2013-10-239588-801-12451.10 ppb
2013-10-239588-800-0850ND
2013-10-239588-803-11551.10 ppb
2014-01-239588-801-13001.60 ppb
2014-01-239588-800-0900ND
2014-01-239588-803-1225ND
2014-01-239588-802-0845ND
2014-04-229588-802-0830ND
2014-04-229588-800-0840ND
2014-04-229588-803-1045ND
2014-04-229588-801-1200ND
2014-07-239588-802-0830ND
2014-07-239588-800-0820ND
2014-07-239588-801-0845ND
2014-07-239588-803-0905ND
2014-10-239588-800-0905ND
2014-10-239588-801-12151.30 ppb
2014-10-239588-802-0850ND
2014-10-239588-803-12001.20 ppb
2015-01-239588-801-12051.20 ppb
2015-01-239588-800-0830ND
2015-01-239588-803-11301.10 ppb
2015-01-239588-802-0820ND
2015-04-229588-800-0830ND
2015-04-229588-801-1135ND
2015-04-229588-802-0815ND
2015-04-229588-803-1120ND
2015-07-239588-802-0820ND
2015-07-239588-803-11401.10 ppb
2015-07-239588-801-1205ND
2015-07-239588-800-0835ND
2015-10-269588-801-1150ND
2015-10-269588-802-0820ND
2015-10-269588-800-0830ND
2015-10-269588-803-1135ND
2016-01-269588-802-0840ND
2016-01-269588-801-12101.10 ppb
2016-01-269588-800-0850ND
2016-01-269588-803-11551.10 ppb
2016-04-229588-800-0840ND
2016-04-229588-802-0820ND
2016-04-229588-803-1135ND
2016-04-229588-801-1210ND
2016-07-269588-803-1110ND
2016-07-269588-801-1125ND
2016-07-269588-800-0835ND
2016-07-269588-802-0825ND
2016-10-269588-801-1205ND
2016-10-269588-802-0845ND
2016-10-269588-803-1150ND
2016-10-269588-800-0900ND
2017-01-249588-800-0850ND
2017-01-249588-801-1210ND
2017-01-249588-803-1150ND
2017-01-249588-802-0835ND
2017-04-249588-800-1355ND
2017-04-249588-802-1345ND
2017-04-249588-803-1315ND
2017-04-249588-801-1330ND
2017-07-279588-801-1330ND
2017-07-279588-803-1315ND
2017-07-279588-802-1345ND
2017-07-279588-800-1405ND
2017-10-249588-802-0830ND
2017-10-249588-803-1145ND
2017-10-249588-801-1210ND
2017-10-249588-800-0840ND