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EWG's Tap Water Database — 2019 UPDATE

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Haloacetic acids (HAA5)

San Fernando Water Department

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)

8

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND120ND
2013ND160ND
20140.163 ppb161ND - 2.60 ppb
20150.581 ppb163ND - 3.80 ppb
20160.206 ppb161ND - 3.30 ppb
20170.475 ppb163ND - 3.10 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
2012-04-069590-800-1035ND
2012-04-069590-801-1020ND
2012-04-069590-802-0950ND
2012-04-069590-803-1055ND
2012-07-189590-801-0950ND
2012-07-189590-802-0925ND
2012-07-189590-800-1010ND
2012-07-189590-803-1030ND
2012-10-249590-802-0950ND
2012-10-249590-801-1115ND
2012-10-249590-800-1055ND
2012-10-249590-803-1030ND
2013-01-169590-803-1015ND
2013-01-169590-800-1030ND
2013-01-169590-801-1100ND
2013-01-169590-802-0950ND
2013-04-249590-800-0835ND
2013-04-249590-801-0815ND
2013-04-249590-802-0750ND
2013-04-249590-803-0900ND
2013-07-179590-802-0920ND
2013-07-179590-800-1005ND
2013-07-179590-803-0945ND
2013-07-179590-801-1030ND
2013-10-169590-802-0945ND
2013-10-169590-800-1027ND
2013-10-169590-801-1045ND
2013-10-169590-803-1010ND
2014-01-159590-802-0940ND
2014-01-159590-801-1035ND
2014-01-159590-803-1000ND
2014-01-159590-800-1020ND
2014-04-309590-801-1040ND
2014-04-309590-800-1020ND
2014-04-309590-803-1000ND
2014-04-309590-802-0940ND
2014-07-119590-803-1030ND
2014-07-119590-800-1050ND
2014-07-119590-802-1010ND
2014-07-119590-801-1115ND
2014-10-079590-802-0930ND
2014-10-079590-803-1000ND
2014-10-079590-800-10152.60 ppb
2014-10-079590-801-1045ND
2015-01-219590-802-1030ND
2015-01-219590-803-1050ND
2015-01-219590-801-1130ND
2015-01-219590-800-1110ND
2015-05-139590-800-10202.80 ppb
2015-05-139590-801-1035ND
2015-05-139590-802-0940ND
2015-05-139590-803-1000ND
2015-08-129590-800-10503.80 ppb
2015-08-129590-801-1110ND
2015-08-129590-802-1000ND
2015-08-129590-803-1025ND
2015-10-299590-803-0955ND
2015-10-299590-800-10102.70 ppb
2015-10-299590-801-1030ND
2015-10-299590-802-0930ND
2016-02-249590-802-0940ND
2016-02-249590-803-1010ND
2016-02-249590-801-1110ND
2016-02-249590-800-1040ND
2016-04-209590-802-0918ND
2016-04-209590-800-1000ND
2016-04-209590-803-0937ND
2016-04-209590-801-1016ND
2016-07-159590-800-10403.30 ppb
2016-07-159590-802-0955ND
2016-07-159590-803-1020ND
2016-07-159590-801-1105ND
2016-10-139590-802-0845ND
2016-10-139590-803-1040ND
2016-10-139590-800-1015ND
2016-10-139590-801-0815ND
2017-01-139590-801-1045ND
2017-01-139590-800-1015ND
2017-01-139590-803-0945ND
2017-01-139590-802-0920ND
2017-04-129590-801-1050ND
2017-04-129590-803-0955ND
2017-04-129590-800-10152.40 ppb
2017-04-129590-802-0930ND
2017-07-129590-801-1120ND
2017-07-129590-803-1035ND
2017-07-129590-800-11002.10 ppb
2017-07-129590-802-1012ND
2017-10-119590-800-10503.10 ppb
2017-10-119590-801-1110ND
2017-10-119590-802-1000ND
2017-10-119590-803-1020ND