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EWG's Tap Water Database — 2021 UPDATE

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Haloacetic acids (HAA5)

Bellflower - Somerset MWC

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

 

96

Samples

0

Samples exceeding legal limit (MCL)

6

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.456 ppb165ND - 2.00 ppb
20150.0625 ppb161ND - 1.000 ppb
2016ND160ND
2017ND160ND
2018ND160ND
2019ND160ND

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
2014-01-283761-802-0806ND
2014-01-283761-800-1011ND
2014-01-283761-801-1041ND
2014-01-283761-803-0830ND
2014-04-223761-803-0938ND
2014-04-223761-802-0921ND
2014-04-223761-801-1025ND
2014-04-223761-800-0911ND
2014-07-153761-803-0845ND
2014-07-153761-802-0856ND
2014-07-153761-801-0906ND
2014-07-153761-800-06451.000 ppb
2014-10-143761-802-08382.00 ppb
2014-10-143761-801-09261.50 ppb
2014-10-143761-803-08521.60 ppb
2014-10-143761-800-09511.20 ppb
2015-01-133761-803-0758ND
2015-01-133761-802-0804ND
2015-01-133761-801-0850ND
2015-01-133761-800-0840ND
2015-04-143761-803-0625ND
2015-04-143761-802-0631ND
2015-04-143761-800-0700ND
2015-04-143761-801-0645ND
2015-07-143761-800-0842ND
2015-07-143761-803-0903ND
2015-07-143761-802-0924ND
2015-07-143761-801-0849ND
2015-10-193761-801-1350ND
2015-10-193761-800-14091.000 ppb
2015-10-193761-803-1435ND
2015-10-193761-802-1420ND
2016-01-193761-801-0910ND
2016-01-193761-800-0848ND
2016-01-193761-803-0810ND
2016-01-193761-802-0800ND
2016-04-123761-801-0824ND
2016-04-123761-800-0751ND
2016-04-123761-803-0901ND
2016-04-123761-802-1115ND
2016-07-193761-803-0841ND
2016-07-193761-801-0812ND
2016-07-193761-800-0757ND
2016-07-193761-802-0725ND
2016-10-183761-803-0958ND
2016-10-183761-801-0913ND
2016-10-183761-802-0946ND
2016-10-183761-800-0858ND
2017-01-173761-802-0714ND
2017-01-173761-803-0901ND
2017-01-173761-801-0807ND
2017-01-173761-800-0822ND
2017-04-113761-802-0823ND
2017-04-113761-800-1135ND
2017-04-113761-801-0746ND
2017-04-113761-803-0842ND
2017-07-113761-800-0800ND
2017-07-113761-801-0745ND
2017-07-113761-803-0830ND
2017-07-113761-802-0815ND
2017-10-033761-803-0906ND
2017-10-033761-800-0759ND
2017-10-033761-802-0827ND
2017-10-033761-801-0741ND
2018-01-083761-803-0925ND
2018-01-083761-800-1105ND
2018-01-083761-801-1116ND
2018-01-083761-802-0852ND
2018-04-103761-801-0945ND
2018-04-103761-802-0823ND
2018-04-103761-803-0854ND
2018-04-103761-800-0936ND
2018-07-103761-801-0823ND
2018-07-103761-803-0904ND
2018-07-103761-802-0841ND
2018-07-103761-800-0805ND
2018-10-093761-801-0903ND
2018-10-093761-803-0810ND
2018-10-093761-802-0749ND
2018-10-093761-800-1134ND
2019-01-083761-800-0940ND
2019-01-083761-802-0720ND
2019-01-083761-801-0922ND
2019-01-083761-803-0750ND
2019-04-093761-800-1030ND
2019-04-093761-802-0730ND
2019-04-093761-803-0815ND
2019-04-093761-801-0700ND
2019-07-093761-803-0805ND
2019-07-093761-802-0730ND
2019-07-093761-800-0705ND
2019-07-093761-801-0712ND
2019-10-083761-803-0835ND
2019-10-083761-802-0810ND
2019-10-083761-800-0730ND
2019-10-083761-801-0755ND