Know Your Environment. Protect Your Health.

Haloacetic acids (HAA5)

CTWC - Shoreline Region-Guilford System

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.

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96

Samples

0

Samples exceeding legal limit (MCL)

96

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201816.5 ppb16165.40 ppb - 33.0 ppb
201911.7 ppb16165.50 ppb - 18.6 ppb
202015.1 ppb16167.40 ppb - 28.3 ppb
202116.9 ppb161610.7 ppb - 28.5 ppb
202217.8 ppb16169.60 ppb - 27.3 ppb
202321.4 ppb16169.40 ppb - 36.0 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
2018-03-15CA03074HAA510.5 ppb
2018-03-15CA03075HAA515.9 ppb
2018-03-15CA03076HAA516.0 ppb
2018-03-15CA03073HAA513.0 ppb
2018-06-26CA80045HAA533.0 ppb
2018-06-26CA80046HAA523.0 ppb
2018-06-26CA80047HAA522.0 ppb
2018-06-26CA80048HAA522.0 ppb
2018-09-12DBP 20050504223.4 ppb
2018-09-12DBP 20050504316.3 ppb
2018-09-12DBP 20050504424.2 ppb
2018-09-12DBP 20050504716.6 ppb
2018-12-17DBP 2005162375.40 ppb
2018-12-17DBP 2005162398.30 ppb
2018-12-17DBP 2005162388.30 ppb
2018-12-17DBP 2005162356.10 ppb
2019-03-11DBP 2005241505.50 ppb
2019-03-11DBP 2005241517.40 ppb
2019-03-11DBP 2005241529.40 ppb
2019-03-11DBP 2005241549.90 ppb
2019-06-14DBP 2005366729.10 ppb
2019-06-14DBP 20053667411.3 ppb
2019-06-14DBP 20053668012.0 ppb
2019-06-14DBP 20053668213.5 ppb
2019-09-17DBP 20054947913.8 ppb
2019-09-17DBP 20054948111.0 ppb
2019-09-17DBP 20054948010.2 ppb
2019-09-17DBP 20054947811.7 ppb
2019-12-10DBP 20055964318.6 ppb
2019-12-10DBP 20055964415.6 ppb
2019-12-10DBP 20055964515.9 ppb
2019-12-10DBP 20055964212.8 ppb
2020-03-03DBP 20056799811.0 ppb
2020-03-05DBP 2005685747.40 ppb
2020-03-05DBP 20056857512.0 ppb
2020-03-05DBP 20056857613.9 ppb
2020-06-16DBP 20057954619.8 ppb
2020-06-16DBP 20057954716.5 ppb
2020-06-16DBP 20057954522.5 ppb
2020-06-16DBP 20057954317.1 ppb
2020-09-17DBP 20059105111.9 ppb
2020-09-17DBP 20059105214.1 ppb
2020-09-17DBP 20059105310.6 ppb
2020-09-17DBP 20059105413.5 ppb
2020-12-22DBP 20060203014.1 ppb
2020-12-22DBP 20060203128.3 ppb
2020-12-22DBP 20060203213.4 ppb
2020-12-22DBP 20060203315.0 ppb
2021-03-15DBP 20060984517.0 ppb
2021-03-15DBP 20060984210.7 ppb
2021-03-15DBP 20060984313.7 ppb
2021-03-15DBP 20060984416.9 ppb
2021-06-02DBP 20061926418.8 ppb
2021-06-02DBP 20061926518.0 ppb
2021-06-02DBP 20061926619.3 ppb
2021-06-02DBP 20061926317.3 ppb
2021-09-14300059734 30005973825.5 ppb
2021-09-14300059735 30005974028.5 ppb
2021-09-14300059736 30005974218.1 ppb
2021-09-14300059737 30005974419.4 ppb
2021-12-09D300117675 30011768210.7 ppb
2021-12-09D300117674 30011768012.4 ppb
2021-12-09D300117673 30011767812.9 ppb
2021-12-09D300117672 30011767610.7 ppb
2022-03-09CK835199.60 ppb
2022-03-09CK8352010.7 ppb
2022-03-09CK8352111.6 ppb
2022-03-25CK9523019.6 ppb
2022-06-16CL5884413.1 ppb
2022-06-16CL5884527.3 ppb
2022-06-16CL5884623.5 ppb
2022-06-16CL5884723.0 ppb
2022-09-13CM3069716.8 ppb
2022-09-13CM3069516.2 ppb
2022-09-13CM3071412.6 ppb
2022-09-13CM3069621.0 ppb
2022-12-01CM9758719.0 ppb
2022-12-01CM9758816.2 ppb
2022-12-01CM9758924.0 ppb
2022-12-01CM9759020.6 ppb
2023-03-22CN664879.40 ppb
2023-03-22CN6648813.7 ppb
2023-03-22CN6648911.3 ppb
2023-03-22CN6649014.1 ppb
2023-06-15CO3199725.6 ppb
2023-06-15CO3199922.3 ppb
2023-06-15CO3199828.0 ppb
2023-06-15CO3199616.2 ppb
2023-09-05CO9068329.0 ppb
2023-09-05CO9068424.6 ppb
2023-09-05CO9068536.0 ppb
2023-09-05CO9068628.7 ppb
2023-12-07CP6507817.5 ppb
2023-12-07CP6507919.8 ppb
2023-12-07CP6508022.6 ppb
2023-12-07CP6508123.6 ppb