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EWG's Tap Water Database — 2019 UPDATE

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Haloacetic acids (HAA5)

Pico 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.

 

64

Samples

0

Samples exceeding legal limit (MCL)

29

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012N/A00N/A
2013N/A00N/A
20140.681 ppb168ND - 2.00 ppb
20150.550 ppb167ND - 2.00 ppb
20160.625 ppb167ND - 2.70 ppb
20170.556 ppb167ND - 1.70 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
2014-02-119588-801-09531.50 ppb
2014-02-119588-800-0823ND
2014-02-119588-802-11181.000 ppb
2014-02-119588-803-1044ND
2014-06-119588-800-0745ND
2014-06-119588-801-0810ND
2014-06-119588-802-0850ND
2014-06-119588-803-08301.30 ppb
2014-08-139588-802-11371.70 ppb
2014-08-139588-801-1233ND
2014-08-139588-803-1056ND
2014-08-139588-800-13131.10 ppb
2014-11-129588-802-12212.00 ppb
2014-11-129588-801-08571.10 ppb
2014-11-129588-803-1111ND
2014-11-129588-800-08251.20 ppb
2015-02-109588-803-1010ND
2015-02-109588-802-10552.00 ppb
2015-02-109588-801-09101.10 ppb
2015-02-109588-800-07501.20 ppb
2015-05-129588-803-1028ND
2015-05-129588-802-12121.30 ppb
2015-05-129588-800-13511.000 ppb
2015-05-129588-801-0938ND
2015-08-109588-800-0748ND
2015-08-109588-802-1210ND
2015-08-109588-803-1027ND
2015-08-109588-801-08321.20 ppb
2015-11-099588-800-12581.000 ppb
2015-11-099588-802-0958ND
2015-11-099588-803-1016ND
2015-11-099588-801-1114ND
2016-02-109588-802-1248ND
2016-02-109588-803-1043ND
2016-02-109588-800-07581.000 ppb
2016-02-109588-801-0943ND
2016-05-249588-803-1148ND
2016-05-249588-800-07481.50 ppb
2016-05-249588-801-09251.30 ppb
2016-05-249588-802-12412.70 ppb
2016-08-179588-803-1300ND
2016-08-179588-801-09321.000 ppb
2016-08-179588-800-0728ND
2016-08-179588-802-12391.000 ppb
2016-11-089588-800-0746ND
2016-11-089588-803-1336ND
2016-11-089588-801-0930ND
2016-11-089588-802-13051.50 ppb
2017-02-149588-803-1238ND
2017-02-149588-801-1058ND
2017-02-149588-802-13181.40 ppb
2017-02-149588-800-0859ND
2017-05-099588-803-0911ND
2017-05-099588-801-08481.000 ppb
2017-05-099588-802-1035ND
2017-05-099588-800-07541.20 ppb
2017-08-079588-800-14301.10 ppb
2017-08-079588-801-1306ND
2017-08-079588-802-1118ND
2017-08-079588-803-1214ND
2017-11-149588-800-11261.40 ppb
2017-11-149588-802-10341.10 ppb
2017-11-149588-801-12541.70 ppb
2017-11-149588-803-0901ND