Know Your Environment. Protect Your Health.

Haloacetic acids (HAA5)

Dixie Overland 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.

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17

Samples

0

Samples exceeding legal limit (MCL)

11

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201826.3 ppb42ND - 52.5 ppb
20191.50 ppb440.600 ppb - 2.40 ppb
20201.41 ppb220.810 ppb - 2.00 ppb
2021ND20ND
2022ND20ND
20236.30 ppb335.70 ppb - 6.90 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
2018-08-0735410655001ND
2018-08-073541065500252.5 ppb
2018-08-0735410655001ND
2018-08-073541065500252.5 ppb
2019-08-15354911770022.40 ppb
2019-08-15354911770010.600 ppb
2019-08-15354911770022.40 ppb
2019-08-15354911770010.600 ppb
2020-08-22355730900010.810 ppb
2020-08-22355730900022.00 ppb
2021-08-1735657776001ND
2021-08-1735657776002ND
2022-08-2535742991001ND
2022-08-2535742991002ND
2023-08-15358222940025.70 ppb
2023-08-25358235090016.30 ppb
2023-08-25358235090026.90 ppb