Know Your Environment. Protect Your Health.

Haloacetic acids (HAA5)

Danbury Water Department

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.

 

192

Samples

0

Samples exceeding legal limit (MCL)

189

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201819.0 ppb3231ND - 29.4 ppb
201916.1 ppb3231ND - 39.8 ppb
202013.9 ppb3231ND - 26.1 ppb
202120.3 ppb32321.60 ppb - 41.2 ppb
202217.4 ppb32321.70 ppb - 37.0 ppb
202317.2 ppb32323.20 ppb - 44.0 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
2018-03-14211585GE23.7 ppb
2018-03-14211587GE21.2 ppb
2018-03-14211589GE25.7 ppb
2018-03-14211591GE14.3 ppb
2018-03-14211599GE26.7 ppb
2018-03-15211593GE19.5 ppb
2018-03-15211595GE28.6 ppb
2018-03-15211597GE25.1 ppb
2018-06-19215737GE19.8 ppb
2018-06-19215739GE25.9 ppb
2018-06-19215743GE4.40 ppb
2018-06-19215745GE21.6 ppb
2018-06-19215751GE22.7 ppb
2018-06-20215747GE29.4 ppb
2018-06-20215749GE16.0 ppb
2018-06-20215741GE20.4 ppb
2018-09-14DBP 20050548417.4 ppb
2018-09-14DBP 20050548626.0 ppb
2018-09-14DBP 20050549113.9 ppb
2018-09-14DBP 20050549315.1 ppb
2018-09-14DBP 20050549516.6 ppb
2018-09-14DBP 20050549716.3 ppb
2018-09-14DBP 20050549911.2 ppb
2018-09-17DBP 200505658ND
2018-12-14DBP 20051609323.1 ppb
2018-12-14DBP 20051609412.5 ppb
2018-12-14DBP 20051609517.0 ppb
2018-12-14DBP 2005160962.10 ppb
2018-12-14DBP 20051609724.3 ppb
2018-12-14DBP 20051609816.9 ppb
2018-12-14DBP 20051609927.3 ppb
2018-12-14DBP 20051610023.7 ppb
2019-03-14DBP 20052476021.9 ppb
2019-03-14DBP 20052476115.2 ppb
2019-03-14DBP 20052476218.1 ppb
2019-03-14DBP 20052476315.3 ppb
2019-03-14DBP 20052476418.0 ppb
2019-03-14DBP 20052476528.5 ppb
2019-03-14DBP 20052476628.1 ppb
2019-03-14DBP 20052476722.0 ppb
2019-06-20DBP 20053726514.4 ppb
2019-06-20DBP 20053726616.3 ppb
2019-06-20DBP 20053726715.1 ppb
2019-06-20DBP 2005372681.10 ppb
2019-06-20DBP 20053726917.2 ppb
2019-06-20DBP 20053727026.9 ppb
2019-06-20DBP 20053727111.9 ppb
2019-06-20DBP 20053727219.5 ppb
2019-09-19DBP 200549612ND
2019-09-19DBP 20054961339.8 ppb
2019-09-19DBP 2005496151.80 ppb
2019-09-19DBP 20054961712.7 ppb
2019-09-19DBP 20054961810.2 ppb
2019-10-11DBP 20055250315.1 ppb
2019-10-11DBP 20055250414.8 ppb
2019-10-11DBP 20055250517.5 ppb
2019-12-19DBP 20056092612.8 ppb
2019-12-19DBP 20056092711.8 ppb
2019-12-19DBP 20056092911.8 ppb
2019-12-19DBP 20056093021.2 ppb
2019-12-19DBP 20056093118.6 ppb
2019-12-19DBP 2005609327.00 ppb
2019-12-19DBP 20056093415.8 ppb
2019-12-19DBP 20056093515.5 ppb
2020-03-19DBP 20056997613.1 ppb
2020-03-19DBP 20056997711.4 ppb
2020-03-19DBP 20056997815.1 ppb
2020-03-19DBP 2005699799.20 ppb
2020-03-19DBP 20056998017.0 ppb
2020-03-19DBP 20056998113.3 ppb
2020-03-19DBP 20056998221.4 ppb
2020-03-19DBP 20056998317.4 ppb
2020-06-18DBP 2005797949.40 ppb
2020-06-18DBP 20057979515.1 ppb
2020-06-18DBP 20057979613.1 ppb
2020-06-18DBP 2005797973.10 ppb
2020-06-18DBP 20057979816.9 ppb
2020-06-18DBP 20057979915.6 ppb
2020-06-18DBP 20057980011.0 ppb
2020-06-18DBP 20057980119.1 ppb
2020-09-17DBP 2005906613.40 ppb
2020-09-17DBP 20059066216.3 ppb
2020-09-17DBP 200590663ND
2020-09-17DBP 2005906649.80 ppb
2020-09-17DBP 20059066516.9 ppb
2020-09-17DBP 20059066614.5 ppb
2020-09-17DBP 2005906678.00 ppb
2020-09-17DBP 20059066810.00 ppb
2020-12-18DBP 20060159814.5 ppb
2020-12-18DBP 20060159912.2 ppb
2020-12-18DBP 20060160014.4 ppb
2020-12-18DBP 20060160111.8 ppb
2020-12-18DBP 20060160218.8 ppb
2020-12-18DBP 20060160326.1 ppb
2020-12-18DBP 20060160421.4 ppb
2020-12-18DBP 20060160525.7 ppb
2021-03-18DBP 20061031617.0 ppb
2021-03-18DBP 20061031711.0 ppb
2021-03-18DBP 20061031811.4 ppb
2021-03-18DBP 20061031915.6 ppb
2021-03-18DBP 20061032011.8 ppb
2021-03-18DBP 20061032122.7 ppb
2021-03-18DBP 20061032224.5 ppb
2021-03-18DBP 20061032312.0 ppb
2021-06-17DBP 20062134118.0 ppb
2021-06-17DBP 20062134218.1 ppb
2021-06-17DBP 2006213431.60 ppb
2021-06-17DBP 20062134420.0 ppb
2021-06-17DBP 20062134516.1 ppb
2021-06-17DBP 20062134616.4 ppb
2021-06-17DBP 20062134718.1 ppb
2021-06-17DBP 20062134833.7 ppb
2021-09-1427262535.1 ppb
2021-09-142726173.50 ppb
2021-09-1427261118.0 ppb
2021-09-1427261328.9 ppb
2021-09-1527261532.8 ppb
2021-09-1527261920.9 ppb
2021-09-1527262125.2 ppb
2021-09-1527262316.6 ppb
2021-12-13277827X28.0 ppb
2021-12-14277829X5.20 ppb
2021-12-14277833X35.0 ppb
2021-12-14277835X32.0 ppb
2021-12-14277837X41.2 ppb
2021-12-14277823X19.7 ppb
2021-12-14277825X21.5 ppb
2021-12-1427783118.6 ppb
2022-03-0828177737.0 ppb
2022-03-0828177222.5 ppb
2022-03-0828177318.0 ppb
2022-03-0828177514.5 ppb
2022-03-0928177422.0 ppb
2022-03-0928177829.4 ppb
2022-03-1028177930.0 ppb
2022-03-1028177625.4 ppb
2022-06-1428830318.8 ppb
2022-06-1428830530.0 ppb
2022-06-142882974.50 ppb
2022-06-1428829917.6 ppb
2022-06-1528830134.0 ppb
2022-06-1528829117.8 ppb
2022-06-1528829319.5 ppb
2022-06-1528829518.6 ppb
2022-09-1429629017.7 ppb
2022-09-1529629212.6 ppb
2022-09-152962941.70 ppb
2022-09-1529629610.7 ppb
2022-09-1529629811.0 ppb
2022-09-152963001.80 ppb
2022-09-1529630216.3 ppb
2022-09-152963085.00 ppb
2022-12-1330302816.2 ppb
2022-12-1330303113.2 ppb
2022-12-1330303521.6 ppb
2022-12-1330303719.6 ppb
2022-12-1330303914.4 ppb
2022-12-1430303313.5 ppb
2022-12-153030248.60 ppb
2022-12-1530302612.3 ppb
2023-03-0630781311.5 ppb
2023-03-0730781120.8 ppb
2023-03-073078129.70 ppb
2023-03-0730781718.3 ppb
2023-03-0730781811.1 ppb
2023-03-0730781410.1 ppb
2023-03-0730781620.5 ppb
2023-03-0830781512.4 ppb
2023-06-06N3F0423-0124.1 ppb
2023-06-06N3F0423-0324.0 ppb
2023-06-06N3F0423-0644.0 ppb
2023-06-06N3F0423-0821.6 ppb
2023-06-07N3F0423-0719.8 ppb
2023-06-07N3F0423-043.20 ppb
2023-06-07N3F0423-0222.0 ppb
2023-06-08N3F0423-0520.2 ppb
2023-09-12CO999826.10 ppb
2023-09-12CO9998319.7 ppb
2023-09-12CO9998919.3 ppb
2023-09-13CO9998615.0 ppb
2023-09-13CO9998714.2 ppb
2023-09-13CO999888.50 ppb
2023-09-14CO9998418.2 ppb
2023-09-14CO999854.40 ppb
2023-12-11CP6821319.2 ppb
2023-12-12CP682146.70 ppb
2023-12-12CP6821630.5 ppb
2023-12-12CP6821722.4 ppb
2023-12-12CP6821821.6 ppb
2023-12-12CP6821120.1 ppb
2023-12-12CP6821216.6 ppb
2023-12-13CP6821514.3 ppb