Know Your Environment. Protect Your Health.

Haloacetic acids (HAA5)

Dripping Springs 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

0

Samples exceeding legal limit (MCL)

25

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20187.89 ppb84ND - 25.0 ppb
20198.59 ppb84ND - 20.6 ppb
20203.78 ppb85ND - 10.5 ppb
20215.53 ppb84ND - 12.8 ppb
20224.48 ppb84ND - 13.3 ppb
20233.99 ppb84ND - 12.2 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
2018-01-31AE11543ND
2018-01-31AE1153912.4 ppb
2018-04-16AE2246916.8 ppb
2018-04-16AE22467ND
2018-07-30AE34892ND
2018-07-30AE348938.90 ppb
2018-11-15AE46206ND
2018-11-15AE4620725.0 ppb
2019-02-11AE53736ND
2019-02-11AE5373920.6 ppb
2019-05-16AE6681518.7 ppb
2019-05-16AE66818ND
2019-08-28AE8133213.6 ppb
2019-08-28AE81329ND
2019-10-14AE8643315.8 ppb
2019-10-14AE86434ND
2020-03-11AF02220ND
2020-03-11AF022214.10 ppb
2020-06-15AF151984.90 ppb
2020-06-15AF15202ND
2020-09-03AF2645910.5 ppb
2020-09-03AF264611.40 ppb
2020-11-18AF349809.30 ppb
2020-11-18AF34981ND
2021-02-11AF4367511.0 ppb
2021-02-11AF43676ND
2021-05-11AF5319712.8 ppb
2021-05-11AF53212ND
2021-08-04AF6462110.4 ppb
2021-08-04AF64622ND
2021-10-11AF72881ND
2021-10-11AF7288210.00 ppb
2022-03-02AF8721613.3 ppb
2022-03-02AF87217ND
2022-06-07AF998395.20 ppb
2022-06-07AF99840ND
2022-09-07AG11802ND
2022-09-07AG118034.90 ppb
2022-10-20AG17812ND
2022-10-20AG1781312.4 ppb
2023-03-06AG315109.20 ppb
2023-03-06AG31511ND
2023-06-22AG45563ND
2023-06-22AG455644.40 ppb
2023-08-17AG52994ND
2023-08-17AG529976.10 ppb
2023-11-07AG62566ND
2023-11-07AG6256712.2 ppb