Know Your Environment. Protect Your Health.

Haloacetic acids (HAA5)

City Of Glen Rose

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)

27

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20189.61 ppb882.10 ppb - 25.5 ppb
201914.5 ppb882.00 ppb - 37.0 ppb
20207.68 ppb84ND - 20.4 ppb
20211.81 ppb82ND - 12.3 ppb
20220.700 ppb82ND - 4.60 ppb
20231.36 ppb83ND - 5.80 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
2018-02-15Q18066070028.70 ppb
2018-02-15Q18066070013.80 ppb
2018-04-26Q18171290022.10 ppb
2018-04-26Q18171290013.90 ppb
2018-08-08Q183171700925.5 ppb
2018-08-08Q183171701921.7 ppb
2018-10-31Q18437250012.30 ppb
2018-10-31Q18437250028.90 ppb
2019-02-13Q190663200122.7 ppb
2019-02-13Q190663200210.6 ppb
2019-05-01Q191751500912.7 ppb
2019-05-01Q191751502216.6 ppb
2019-08-13Q195448200311.5 ppb
2019-08-13Q19544820022.70 ppb
2019-11-05Q19750610012.00 ppb
2019-11-05Q197506100237.0 ppb
2020-02-27Q2007409001ND
2020-02-27Q20074090027.00 ppb
2020-06-02Q2021724001ND
2020-06-02Q202172400220.4 ppb
2020-09-21Q2037371009ND
2020-09-21Q2037371010ND
2020-11-24Q204689001919.0 ppb
2020-11-24Q204689002015.0 ppb
2021-03-17Q210698400712.3 ppb
2021-03-17Q2106984008ND
2021-06-01Q21140220202.20 ppb
2021-06-01Q2114022021ND
2021-09-01Q2123787011ND
2021-09-01Q2123787012ND
2021-12-02Q2133430002ND
2021-12-02Q2133430003ND
2022-02-22Q22062420061.000 ppb
2022-02-22Q2206242007ND
2022-05-09Q2213793001ND
2022-05-09Q2213793002ND
2022-08-01Q22219030014.60 ppb
2022-08-01Q2221903002ND
2022-11-03Q2233476017ND
2022-11-03Q2233476018ND
2023-01-11Q2301770007ND
2023-01-11Q2301770008ND
2023-04-05Q2312645003ND
2023-04-05Q2312645004ND
2023-07-10Q23265700022.00 ppb
2023-07-10Q2326570003ND
2023-10-11Q23434530263.10 ppb
2023-10-11Q23434530275.80 ppb