Know Your Environment. Protect Your Health.

Haloacetic acids (HAA5)

Hazardville Water Company

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.

 

96

Samples

0

Samples exceeding legal limit (MCL)

64

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20181.59 ppb1610ND - 6.10 ppb
20191.59 ppb1610ND - 6.20 ppb
20202.51 ppb1611ND - 6.60 ppb
20211.94 ppb1611ND - 5.90 ppb
20221.46 ppb169ND - 6.40 ppb
20232.92 ppb1613ND - 9.00 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
2018-01-22BZ78628HAA52.80 ppb
2018-01-22BZ78629HAA5ND
2018-01-22BZ78630HAA5ND
2018-01-22BZ78627HAA51.30 ppb
2018-04-23CA35126HAA52.60 ppb
2018-04-23CA35127HAA52.60 ppb
2018-04-23CA35128HAA51.30 ppb
2018-04-23CA35129HAA5ND
2018-07-23CA967621.20 ppb
2018-07-23CA967635.20 ppb
2018-07-23CA967641.000 ppb
2018-07-23CA96765ND
2018-10-22CB803936.10 ppb
2018-10-22CB803951.30 ppb
2018-10-22CB80394ND
2018-10-22CB80392ND
2019-01-21CC326303.00 ppb
2019-01-21CC32631ND
2019-01-21CC326321.10 ppb
2019-01-21CC326334.30 ppb
2019-04-22CC99840ND
2019-04-22CC998411.40 ppb
2019-04-22CC99842ND
2019-04-22CC998431.10 ppb
2019-07-22CD632566.20 ppb
2019-07-22CD632582.10 ppb
2019-07-22CD632571.30 ppb
2019-07-22CD63255ND
2019-10-21CE457063.50 ppb
2019-10-21CE45707ND
2019-10-21CE45708ND
2019-10-21CE457051.50 ppb
2020-01-27CF222223.60 ppb
2020-01-27CF222233.70 ppb
2020-01-27CF22224ND
2020-01-27CF22225ND
2020-04-21CF76663ND
2020-04-21CF76664ND
2020-04-21CF766623.60 ppb
2020-04-21CF766614.70 ppb
2020-07-21CG376222.40 ppb
2020-07-21CG376236.60 ppb
2020-07-21CG376243.60 ppb
2020-07-21CG376254.70 ppb
2020-10-26CH044471.40 ppb
2020-10-26CH044484.70 ppb
2020-10-26CH04449ND
2020-10-26CH044501.10 ppb
2021-01-25CH52643ND
2021-01-25CH526403.30 ppb
2021-01-25CH526413.30 ppb
2021-01-25CH52642ND
2021-04-26CI162421.40 ppb
2021-04-26CI162431.10 ppb
2021-04-26CI162441.70 ppb
2021-04-26CI162413.60 ppb
2021-07-26CI828572.60 ppb
2021-07-26CI828585.90 ppb
2021-07-26CI828591.20 ppb
2021-07-26CI82860ND
2021-10-25CJ64838ND
2021-10-25CJ64837ND
2021-10-25CJ648365.80 ppb
2021-10-25CJ648351.10 ppb
2022-01-24CK22495ND
2022-01-24CK22496ND
2022-01-24CK22497ND
2022-01-24CK22498ND
2022-04-25CL158203.50 ppb
2022-04-25CL158213.60 ppb
2022-04-25CL15822ND
2022-04-25CL158231.30 ppb
2022-07-25CL862271.10 ppb
2022-07-25CL862253.60 ppb
2022-07-25CL86224ND
2022-07-25CL862261.000 ppb
2022-10-24CM697511.30 ppb
2022-10-24CM697526.40 ppb
2022-10-24CM69753ND
2022-10-24CM697541.50 ppb
2023-01-23CN282122.80 ppb
2023-01-23CN282131.20 ppb
2023-01-23CN28214ND
2023-01-23CN282151.000 ppb
2023-04-24CN896803.30 ppb
2023-04-24CN896821.10 ppb
2023-04-24CN89681ND
2023-04-24CN896795.70 ppb
2023-07-24CO569141.20 ppb
2023-07-24CO569154.60 ppb
2023-07-24CO569161.000 ppb
2023-07-24CO569174.90 ppb
2023-10-23CP314675.00 ppb
2023-10-23CP314689.00 ppb
2023-10-23CP31469ND
2023-10-23CP314705.90 ppb