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EWG's Tap Water Database — 2021 UPDATE

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Haloacetic acids (HAA5)

Olivehurst Public UD

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

 

61

Samples

0

Samples exceeding legal limit (MCL)

21

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
201430.4 ppb1130.4 ppb
20150.389 ppb93ND - 1.40 ppb
20160.200 ppb71ND - 1.40 ppb
20170.813 ppb166ND - 6.60 ppb
20180.469 ppb165ND - 1.70 ppb
20191.46 ppb125ND - 11.0 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
2014-08-213761-023-075230.4 ppb
2015-06-251610-023-0836ND
2015-06-251610-026-0849ND
2015-06-251610-025-0913ND
2015-06-251610-024-0905ND
2015-09-031610-023-08231.000 ppb
2015-09-031610-026-0818ND
2015-09-031610-025-0809ND
2015-09-031610-024-08011.10 ppb
2015-12-221610-023-13591.40 ppb
2016-03-021610-023-1403ND
2016-06-071610-023-1412ND
2016-09-191610-026-1423ND
2016-09-191610-023-1343ND
2016-09-191610-023-14581.40 ppb
2016-09-191610-024-1423ND
2016-12-131610-023-1341ND
2017-03-081610-025-1448ND
2017-03-081610-026-14181.20 ppb
2017-03-081610-024-1439ND
2017-03-081610-023-14261.10 ppb
2017-06-121610-025-13291.60 ppb
2017-06-121610-024-1319ND
2017-06-121610-023-1344ND
2017-06-121610-026-13361.50 ppb
2017-09-111610-023-14026.60 ppb
2017-09-111610-025-1432ND
2017-09-111610-026-1410ND
2017-09-111610-024-1420ND
2017-12-135867-026-1344ND
2017-12-135867-023-1336ND
2017-12-135867-024-13561.000 ppb
2017-12-135867-025-1406ND
2018-03-121610-026-1347ND
2018-03-121610-024-14011.40 ppb
2018-03-121610-023-1341ND
2018-03-121610-025-1411ND
2018-06-111610-023-1347ND
2018-06-111610-026-1402ND
2018-06-111610-025-13551.60 ppb
2018-06-111610-024-1413ND
2018-09-191610-025-13541.30 ppb
2018-09-191610-026-14101.50 ppb
2018-09-191610-023-1403ND
2018-09-191610-024-1346ND
2018-12-121610-025-1146ND
2018-12-121610-026-1211ND
2018-12-121610-024-11381.70 ppb
2018-12-121610-023-1200ND
2019-03-111610-024-1402ND
2019-03-111610-026-1430ND
2019-03-111610-023-14221.40 ppb
2019-03-111610-025-1411ND
2019-09-161610-024-1337ND
2019-09-161610-023-14031.20 ppb
2019-09-161610-025-13502.50 ppb
2019-09-161610-026-141211.0 ppb
2019-12-041610-024-14231.40 ppb
2019-12-041610-025-1436ND
2019-12-041610-026-1404ND
2019-12-041610-023-1355ND