Know Your Environment. Protect Your Health.

Haloacetic acids (HAA5)

Walker Water 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.

Click here to read more about disinfection byproducts.

 

128

Samples

0

Samples exceeding legal limit (MCL)

72

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20181.25 ppb3222ND - 3.70 ppb
20190.634 ppb3224ND - 1.37 ppb
20200.393 ppb169ND - 1.35 ppb
20210.865 ppb167ND - 3.60 ppb
20220.380 ppb166ND - 1.21 ppb
20230.636 ppb164ND - 8.20 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
2018-02-0235371888001ND
2018-02-0235371888002ND
2018-02-0235371888003ND
2018-02-0235371888004ND
2018-02-0235371888001ND
2018-02-0235371888002ND
2018-02-0235371888003ND
2018-02-0235371888004ND
2018-05-03353903120013.10 ppb
2018-05-03353903120023.10 ppb
2018-05-03353903120033.70 ppb
2018-05-03353903120042.70 ppb
2018-05-03353903120013.10 ppb
2018-05-03353903120023.10 ppb
2018-05-03353903120033.70 ppb
2018-05-03353903120042.70 ppb
2018-08-07354098110010.960 ppb
2018-08-0735409811002ND
2018-08-07354098110030.810 ppb
2018-08-07354098110040.830 ppb
2018-08-07354098110010.960 ppb
2018-08-0735409811002ND
2018-08-07354098110030.810 ppb
2018-08-07354098110040.830 ppb
2018-11-01354280500011.50 ppb
2018-11-01354280500021.40 ppb
2018-11-01354280500030.950 ppb
2018-11-01354280500040.930 ppb
2018-11-01354280500011.50 ppb
2018-11-01354280500021.40 ppb
2018-11-01354280500030.950 ppb
2018-11-01354280500040.930 ppb
2019-02-14354488430011.20 ppb
2019-02-14354488430020.840 ppb
2019-02-14354488430031.30 ppb
2019-02-14354488430041.30 ppb
2019-02-14354488430011.20 ppb
2019-02-14354488430020.840 ppb
2019-02-14354488430031.30 ppb
2019-02-14354488430041.30 ppb
2019-05-15354693790010.370 ppb
2019-05-15354693790020.810 ppb
2019-05-15354693790030.550 ppb
2019-05-15354693790041.37 ppb
2019-05-15354693790010.370 ppb
2019-05-15354693790020.810 ppb
2019-05-15354693790030.550 ppb
2019-05-15354693790041.37 ppb
2019-08-01354868730010.550 ppb
2019-08-01354868730020.760 ppb
2019-08-01354868730030.520 ppb
2019-08-01354868730040.580 ppb
2019-08-01354868730010.550 ppb
2019-08-01354868730020.760 ppb
2019-08-01354868730030.520 ppb
2019-08-01354868730040.580 ppb
2019-11-0735511062001ND
2019-11-0735511062002ND
2019-11-0735511062003ND
2019-11-0735511062004ND
2019-11-0735511062001ND
2019-11-0735511062002ND
2019-11-0735511062003ND
2019-11-0735511062004ND
2020-02-06355294960010.430 ppb
2020-02-06355294960020.950 ppb
2020-02-06355294960030.440 ppb
2020-02-06355294960041.35 ppb
2020-05-0835548831001ND
2020-05-0835548831002ND
2020-05-0835548831003ND
2020-05-0835548831004ND
2020-08-06355690840010.300 ppb
2020-08-0635569084002ND
2020-08-0635569084003ND
2020-08-06355690840040.480 ppb
2020-11-06355904830010.820 ppb
2020-11-06355904830020.730 ppb
2020-11-0635590483003ND
2020-11-06355904830040.780 ppb
2021-02-0535610002001ND
2021-02-0535610002002ND
2021-02-0535610002003ND
2021-02-0535610002004ND
2021-05-0635631659001ND
2021-05-0635631659002ND
2021-05-06356316590030.560 ppb
2021-05-06356316590040.390 ppb
2021-08-05356537710013.60 ppb
2021-08-05356537710023.10 ppb
2021-08-05356537710033.20 ppb
2021-08-05356537710042.70 ppb
2021-11-0535676292001ND
2021-11-05356762920020.290 ppb
2021-11-0535676292003ND
2021-11-0535676292004ND
2022-02-10356965620051.01 ppb
2022-02-10356965620061.14 ppb
2022-02-10356965620070.990 ppb
2022-02-10356965620081.21 ppb
2022-05-0635715922001ND
2022-05-06357159220020.980 ppb
2022-05-0635715922003ND
2022-05-06357159220040.750 ppb
2022-08-1735741191001ND
2022-08-1735741191002ND
2022-08-1735741191003ND
2022-08-1735741191004ND
2022-11-0435758151001ND
2022-11-0435758151002ND
2022-11-0435758151003ND
2022-11-0435758151004ND
2023-02-0335776989001ND
2023-02-0335776989002ND
2023-02-0335776989003ND
2023-02-0335776989004ND
2023-05-0535797785001ND
2023-05-0535797785002ND
2023-05-0535797785003ND
2023-05-0535797785004ND
2023-08-02358180850010.620 ppb
2023-08-02358180850020.710 ppb
2023-08-02358180850030.650 ppb
2023-08-02358180850048.20 ppb
2023-11-0335839250001ND
2023-11-0335839250002ND
2023-11-0335839250003ND
2023-11-0335839250004ND