Know Your Environment. Protect Your Health.

Haloacetic acids (HAA5)

Stockbridge

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.

 

93

Samples

0

Samples exceeding legal limit (MCL)

57

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201812.2 ppb169ND - 30.0 ppb
201916.9 ppb1611ND - 44.0 ppb
202015.3 ppb1610ND - 44.9 ppb
202116.2 ppb159ND - 50.7 ppb
202217.0 ppb1410ND - 44.0 ppb
202319.5 ppb168ND - 49.0 ppb

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

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
2018-02-05AJ8301918.7 ppb
2018-02-05AJ83018ND
2018-02-05AJ8301622.0 ppb
2018-02-05AJ83017ND
2018-05-02AJ8840820.6 ppb
2018-05-02AJ88409ND
2018-05-02AJ884104.00 ppb
2018-05-02AJ8841130.0 ppb
2018-08-06AJ9644126.0 ppb
2018-08-06AJ96442ND
2018-08-06AJ96443ND
2018-08-06AJ9644430.0 ppb
2018-11-05AK05200ND
2018-11-05AK0519917.6 ppb
2018-11-05AK0520227.0 ppb
2018-11-05AK05201ND
2019-02-05AK1044328.0 ppb
2019-02-05AK10442ND
2019-02-05AK10441ND
2019-02-05AK1044022.0 ppb
2019-05-03AK1626834.0 ppb
2019-05-03AK16269ND
2019-05-03AK16270ND
2019-05-03AK1627144.0 ppb
2019-08-09AK2550718.7 ppb
2019-08-09AK25508ND
2019-08-09AK255091.40 ppb
2019-08-09AK2551041.0 ppb
2019-11-08AK3646011.3 ppb
2019-11-08AK3646130.0 ppb
2019-11-08AK364595.70 ppb
2019-11-08AK3645834.0 ppb
2020-02-04AK40594ND
2020-02-04AK4059523.0 ppb
2020-02-04AK40593ND
2020-02-04AK4059217.0 ppb
2020-05-28AK4679024.0 ppb
2020-05-28AK46791ND
2020-05-28AK46792ND
2020-05-28AK4679328.0 ppb
2020-07-28AK52725ND
2020-07-28AK527261.50 ppb
2020-07-28AK5272744.9 ppb
2020-07-28AK5272422.6 ppb
2020-11-04AK6374711.3 ppb
2020-11-04AK6374531.0 ppb
2020-11-04AK63746ND
2020-11-04AK6374842.0 ppb
2021-02-23AK7005715.8 ppb
2021-02-23AK70055ND
2021-02-23AK7005411.6 ppb
2021-05-26AK7586645.0 ppb
2021-05-26AK7586928.0 ppb
2021-05-26AK75868ND
2021-05-26AK75867ND
2021-08-09AK82481ND
2021-08-09AK824801.10 ppb
2021-08-09AK8247948.0 ppb
2021-08-09AK8248250.7 ppb
2021-12-03AK9161419.5 ppb
2021-12-03AK91613ND
2021-12-03AK91612ND
2021-12-03AK9161124.0 ppb
2022-02-28AK96075ND
2022-02-28AK9607324.0 ppb
2022-02-28AK96074ND
2022-02-28AK9607615.5 ppb
2022-05-31AL0219030.0 ppb
2022-05-31AL0218744.0 ppb
2022-05-31AL02188ND
2022-05-31AL021891.30 ppb
2022-10-17AL1852627.8 ppb
2022-10-17AL1852932.0 ppb
2022-10-17AL185281.10 ppb
2022-10-17AL18527ND
2022-12-08AL2180727.0 ppb
2022-12-08AL2180435.0 ppb
2023-03-08AL2685830.0 ppb
2023-03-08AL26857ND
2023-03-08AL26856ND
2023-03-08AL2685532.0 ppb
2023-05-12AL3160047.1 ppb
2023-05-12AL31599ND
2023-05-12AL31598ND
2023-05-12AL3159745.0 ppb
2023-08-21AL4085449.0 ppb
2023-08-21AL40853ND
2023-08-21AL40852ND
2023-08-21AL4085135.0 ppb
2023-11-27AL4977028.0 ppb
2023-11-27AL49769ND
2023-11-27AL49768ND
2023-11-27AL4976746.0 ppb