Know Your Environment. Protect Your Health.

Haloacetic acids (HAA5)

University of Connecticut - Main Campus

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.

 

118

Samples

0

Samples exceeding legal limit (MCL)

94

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20183.10 ppb2417ND - 8.30 ppb
20193.12 ppb2418ND - 12.2 ppb
20203.90 ppb2219ND - 10.7 ppb
20215.69 ppb1614ND - 17.4 ppb
20225.43 ppb1614ND - 12.4 ppb
20234.63 ppb1612ND - 17.1 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
2018-03-15CA02987HAA57.30 ppb
2018-03-15CA02988HAA52.90 ppb
2018-03-15CA02989HAA58.30 ppb
2018-03-15CA02990HAA5ND
2018-06-12CA68568HAA56.60 ppb
2018-06-12CA68569HAA56.90 ppb
2018-06-12CA68570HAA56.00 ppb
2018-06-12CA68571HAA5ND
2018-09-19DBP 2005061824.80 ppb
2018-09-19DBP 200506184ND
2018-09-19DBP 2005061860.600 ppb
2018-09-19DBP 2005061892.60 ppb
2018-09-25DBP 2005067204.80 ppb
2018-09-25DBP 200506721ND
2018-09-25DBP 2005067220.600 ppb
2018-09-25DBP 2005067234.10 ppb
2018-09-26DBP 200506966ND
2018-09-27DBP 2005070732.20 ppb
2018-12-04DBP 2005147243.00 ppb
2018-12-04DBP 200514725ND
2018-12-04DBP 2005147260.600 ppb
2018-12-04DBP 2005147287.00 ppb
2018-12-17DBP 2005162816.20 ppb
2018-12-17DBP 200516282ND
2019-03-18DBP 2005250245.10 ppb
2019-03-18DBP 2005250266.80 ppb
2019-03-18DBP 2005250294.80 ppb
2019-03-18DBP 2005250310.700 ppb
2019-03-18DBP 2005250335.30 ppb
2019-03-18DBP 200525034ND
2019-06-24DBP 2005375410.800 ppb
2019-06-24DBP 2005375422.80 ppb
2019-06-24DBP 200537543ND
2019-06-25DBP 2005378064.70 ppb
2019-06-25DBP 2005378076.40 ppb
2019-06-25DBP 2005378081.20 ppb
2019-09-16DBP 2005490013.60 ppb
2019-09-16DBP 2005490021.60 ppb
2019-09-16DBP 2005490401.50 ppb
2019-09-16DBP 200549041ND
2019-09-16DBP 2005490432.20 ppb
2019-09-16DBP 200549044ND
2019-12-09DBP 2005594125.40 ppb
2019-12-09DBP 2005594163.70 ppb
2019-12-09DBP 200559419ND
2019-12-09DBP 20055942212.2 ppb
2019-12-09DBP 2005594256.00 ppb
2019-12-09DBP 200559427ND
2020-03-10DBP 20056886110.2 ppb
2020-03-10DBP 2005688629.00 ppb
2020-03-10DBP 2005688631.90 ppb
2020-03-10DBP 2005688640.800 ppb
2020-03-10DBP 2005688657.20 ppb
2020-03-10DBP 2005688661.70 ppb
2020-06-08DBP 20057834810.7 ppb
2020-06-08DBP 2005783499.60 ppb
2020-06-08DBP 2005783501.30 ppb
2020-06-08DBP 200578351ND
2020-06-08DBP 2005783523.50 ppb
2020-06-08DBP 2005783530.600 ppb
2020-09-08DBP 2005893105.70 ppb
2020-09-08DBP 2005893115.80 ppb
2020-09-08DBP 2005893120.700 ppb
2020-09-08DBP 2005893130.900 ppb
2020-09-08DBP 2005893143.00 ppb
2020-09-08DBP 200589315ND
2020-12-14DBP 2006011564.80 ppb
2020-12-14DBP 2006011573.20 ppb
2020-12-14DBP 200601385ND
2020-12-15DBP 2006014755.10 ppb
2021-03-10DBP 2006093797.30 ppb
2021-03-10DBP 2006093803.80 ppb
2021-03-10DBP 2006093816.50 ppb
2021-03-10DBP 2006093822.90 ppb
2021-06-01DBP 20061904212.1 ppb
2021-06-01DBP 2006190441.60 ppb
2021-06-01DBP 2006190464.70 ppb
2021-06-01DBP 200619048ND
2021-09-08300054204 3000542088.48 ppb
2021-09-08300054205 3000542102.44 ppb
2021-09-08300054206 3000542123.26 ppb
2021-09-08300054207 3000542143.81 ppb
2021-12-07D300114234 30011423815.4 ppb
2021-12-07D300114235 3001142401.40 ppb
2021-12-07D300114236 30011424217.4 ppb
2021-12-07D300114237 300114244ND
2022-03-07CK804329.70 ppb
2022-03-07CK80433ND
2022-03-07CK8043412.4 ppb
2022-03-07CK804358.00 ppb
2022-06-02CL468105.80 ppb
2022-06-02CL46811ND
2022-06-02CL4681210.7 ppb
2022-06-02CL468135.50 ppb
2022-09-12CM285246.40 ppb
2022-09-12CM285251.60 ppb
2022-09-12CM285267.30 ppb
2022-09-12CM285273.80 ppb
2022-12-12CN025224.60 ppb
2022-12-12CN025232.70 ppb
2022-12-12CN025247.30 ppb
2022-12-12CN025251.000 ppb
2023-03-08CN552818.80 ppb
2023-03-08CN55282ND
2023-03-08CN552838.10 ppb
2023-03-08CN55284ND
2023-06-05CO1917917.1 ppb
2023-06-05CO191801.30 ppb
2023-06-05CO191814.70 ppb
2023-06-05CO191823.10 ppb
2023-09-11CO942106.80 ppb
2023-09-11CO942111.60 ppb
2023-09-11CO942124.00 ppb
2023-09-11CO942133.10 ppb
2023-12-05CP598657.10 ppb
2023-12-05CP59866ND
2023-12-05CP598678.30 ppb
2023-12-05CP59868ND