Know Your Environment. Protect Your Health.

Haloacetic acids (HAA5)

Slc Water Supply Corporation

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.

 

48

Samples

5

Samples exceeding legal limit (MCL)

32

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201843.3 ppb87ND - 135.0 ppb
20199.99 ppb87ND - 21.1 ppb
202010.5 ppb84ND - 44.2 ppb
20210.413 ppb82ND - 2.00 ppb
202239.0 ppb84ND - 163.0 ppb
202313.0 ppb881.000 ppb - 62.5 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
2018-02-28Q180838000827.3 ppb
2018-02-28Q180838000315.7 ppb
2018-05-22Q182063900315.0 ppb
2018-05-22Q182063900228.8 ppb
2018-09-19Q1837448002ND
2018-09-19Q18374480036.40 ppb
2018-12-06Q1850112002118.0 ppb
2018-12-06Q1850112003135.0 ppb
2019-03-06Q190967701119.0 ppb
2019-03-06Q190967701221.1 ppb
2019-06-27Q19405360021.000 ppb
2019-06-27Q194053600316.4 ppb
2019-09-24Q19682020033.40 ppb
2019-09-24Q1968202002ND
2019-11-20Q19776640024.40 ppb
2019-11-20Q197766400314.6 ppb
2020-02-25Q200693000544.2 ppb
2020-02-25Q200693000628.1 ppb
2020-04-16Q20150480025.10 ppb
2020-04-16Q20150480036.60 ppb
2020-09-16Q2037148002ND
2020-09-16Q2037148003ND
2020-12-10Q2049385002ND
2020-12-10Q2049385003ND
2021-03-23Q21074210052.00 ppb
2021-03-23Q2107421006ND
2021-05-24Q21134020041.30 ppb
2021-05-24Q2113402005ND
2021-09-16Q2125449002ND
2021-09-16Q2125449003ND
2021-11-18Q2132377002ND
2021-11-18Q2132377003ND
2022-03-30Q22099740127.80 ppb
2022-03-30Q220997401313.0 ppb
2022-06-07Q2215834002ND
2022-06-07Q2215834003ND
2022-09-14Q2227606002ND
2022-09-14Q2227606003ND
2022-12-21Q2238569001128.0 ppb
2022-12-21Q2238569002163.0 ppb
2023-03-08Q230913800712.2 ppb
2023-03-08Q230913800862.5 ppb
2023-05-23Q231961200214.4 ppb
2023-05-23Q231961200310.00 ppb
2023-09-19Q23402560011.000 ppb
2023-09-19Q23402560021.30 ppb
2023-11-14Q23487560021.10 ppb
2023-11-14Q23487560031.30 ppb