Know Your Environment. Protect Your Health.

Haloacetic acids (HAA5)

Connecticut Water Company - Northern Region-Western 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.

Click here to read more about disinfection byproducts.

 

193

Samples

0

Samples exceeding legal limit (MCL)

191

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201816.4 ppb3231ND - 35.0 ppb
201914.1 ppb32321.30 ppb - 27.0 ppb
202013.3 ppb33330.500 ppb - 29.3 ppb
202116.9 ppb3231ND - 31.7 ppb
202220.4 ppb32322.30 ppb - 42.1 ppb
202319.7 ppb32325.30 ppb - 41.0 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
2018-02-01BZ83504HAA532.0 ppb
2018-02-01BZ83505HAA529.0 ppb
2018-02-01BZ83506HAA535.0 ppb
2018-02-01BZ83507HAA523.0 ppb
2018-02-01BZ83508HAA516.6 ppb
2018-02-01BZ83509HAA519.0 ppb
2018-02-01BZ83510HAA516.8 ppb
2018-02-21BZ93283HAA520.0 ppb
2018-05-03CA41161HAA520.0 ppb
2018-05-03CA41162HAA526.0 ppb
2018-05-03CA41163HAA526.0 ppb
2018-05-03CA41164HAA515.0 ppb
2018-05-03CA41165HAA59.40 ppb
2018-05-03CA41166HAA514.2 ppb
2018-05-03CA41167HAA515.0 ppb
2018-05-15CA48118HAA520.0 ppb
2018-08-02CB040203.40 ppb
2018-08-02CB0402120.0 ppb
2018-08-02CB0402211.0 ppb
2018-08-02CB040233.00 ppb
2018-08-02CB0402410.00 ppb
2018-08-02CB0402520.0 ppb
2018-08-02CB0402619.0 ppb
2018-08-06CB0584020.0 ppb
2018-11-01DBP 2005111338.70 ppb
2018-11-01DBP 2005111346.80 ppb
2018-11-01DBP 2005111355.20 ppb
2018-11-01DBP 200511136ND
2018-11-01DBP 20051113714.2 ppb
2018-11-01DBP 20051113812.4 ppb
2018-11-01DBP 20051113915.6 ppb
2018-11-05DBP 20051138917.7 ppb
2019-02-07DBP 20052108310.9 ppb
2019-02-07DBP 20052108419.9 ppb
2019-02-07DBP 2005210859.00 ppb
2019-02-07DBP 20052108619.6 ppb
2019-02-07DBP 2005210878.80 ppb
2019-02-07DBP 20052108823.9 ppb
2019-02-07DBP 20052108918.2 ppb
2019-02-11DBP 20052125615.7 ppb
2019-05-09DBP 2005315758.00 ppb
2019-05-09DBP 20053157624.4 ppb
2019-05-09DBP 20053157727.0 ppb
2019-05-09DBP 20053158225.8 ppb
2019-05-09DBP 20053158412.2 ppb
2019-05-09DBP 20053158614.1 ppb
2019-05-09DBP 20053158714.1 ppb
2019-05-13DBP 20053183714.9 ppb
2019-08-01DBP 2005427223.40 ppb
2019-08-01DBP 2005427239.90 ppb
2019-08-01DBP 20054272414.3 ppb
2019-08-01DBP 2005427251.30 ppb
2019-08-01DBP 20054272615.6 ppb
2019-08-01DBP 20054272713.4 ppb
2019-08-01DBP 20054272812.1 ppb
2019-08-13DBP 20054475820.0 ppb
2019-11-07DBP 2005558284.80 ppb
2019-11-07DBP 20055583012.5 ppb
2019-11-07DBP 20055583113.5 ppb
2019-11-07DBP 2005558324.10 ppb
2019-11-07DBP 20055583316.9 ppb
2019-11-07DBP 20055583413.5 ppb
2019-11-07DBP 20055583512.3 ppb
2019-11-18DBP 20055700415.7 ppb
2020-01-06DBP 20056166514.8 ppb
2020-02-06DBP 20056535715.2 ppb
2020-02-06DBP 20056535821.7 ppb
2020-02-06DBP 20056535920.7 ppb
2020-02-06DBP 20056536017.1 ppb
2020-02-06DBP 20056536112.0 ppb
2020-02-06DBP 2005653629.70 ppb
2020-02-07DBP 20056564014.2 ppb
2020-02-07DBP 20056564117.8 ppb
2020-05-07DBP 20057517122.0 ppb
2020-05-07DBP 20057517513.7 ppb
2020-05-07DBP 20057517611.8 ppb
2020-05-07DBP 20057517719.7 ppb
2020-05-07DBP 20057517313.4 ppb
2020-05-08DBP 20057517422.6 ppb
2020-05-08DBP 20057517029.3 ppb
2020-05-08DBP 20057517222.6 ppb
2020-08-06DBP 2005857440.700 ppb
2020-08-06DBP 20058575021.9 ppb
2020-08-06DBP 2005857539.70 ppb
2020-08-06DBP 20058575410.1 ppb
2020-08-07DBP 2005857550.500 ppb
2020-08-07DBP 20058575614.4 ppb
2020-08-07DBP 20058575715.5 ppb
2020-08-07DBP 20058575814.9 ppb
2020-11-05DBP 2005973566.90 ppb
2020-11-05DBP 2005973575.60 ppb
2020-11-05DBP 2005973589.40 ppb
2020-11-05DBP 2005973595.00 ppb
2020-11-05DBP 2005973604.50 ppb
2020-11-05DBP 2005973618.40 ppb
2020-11-12DBP 2005982066.00 ppb
2020-11-12DBP 2005982108.20 ppb
2021-02-11DBP 2006068959.50 ppb
2021-02-11DBP 20060689614.8 ppb
2021-02-11DBP 2006069077.70 ppb
2021-02-12DBP 20060691113.6 ppb
2021-02-16DBP 20060691223.4 ppb
2021-02-17DBP 20060711219.4 ppb
2021-02-22DBP 20060745911.9 ppb
2021-02-23DBP 20060764520.7 ppb
2021-05-13DBP 20061723922.3 ppb
2021-05-14DBP 20061723623.6 ppb
2021-05-14DBP 20061723714.9 ppb
2021-05-14DBP 20061723812.9 ppb
2021-05-20DBP 20061831618.4 ppb
2021-05-20DBP 20061831715.2 ppb
2021-05-20DBP 20061831924.3 ppb
2021-05-20DBP 20061832126.1 ppb
2021-08-12DBP 20062875622.4 ppb
2021-08-12DBP 20062875724.3 ppb
2021-08-12DBP 2006287580.500 ppb
2021-08-12DBP 20062875927.2 ppb
2021-08-12DBP 20062876031.7 ppb
2021-08-12DBP 20062876117.6 ppb
2021-08-25DBP 2006298156.60 ppb
2021-08-25DBP 20062981621.4 ppb
2021-11-04D300098348 30009835617.7 ppb
2021-11-04D300098349 30009835815.7 ppb
2021-11-04D300098350 300098360ND
2021-11-04D300098351 30009836215.1 ppb
2021-11-04D300098352 30009836418.9 ppb
2021-11-05D300098353 30009836614.3 ppb
2021-11-05D300098354 30009836811.0 ppb
2021-11-05D300098355 30009837016.1 ppb
2022-02-03CK2975225.0 ppb
2022-02-03CK2975314.5 ppb
2022-02-03CK2975421.4 ppb
2022-02-03CK2975516.8 ppb
2022-02-03CK2975624.7 ppb
2022-02-03CK2975724.9 ppb
2022-02-03CK2975829.0 ppb
2022-02-04CK3148942.1 ppb
2022-05-12CL3151329.9 ppb
2022-05-12CL3151426.2 ppb
2022-05-12CL3151522.7 ppb
2022-05-12CL3151637.3 ppb
2022-05-12CL3151723.7 ppb
2022-05-13CL3151831.9 ppb
2022-05-13CL3151935.4 ppb
2022-05-13CL3152033.8 ppb
2022-08-04CL989635.40 ppb
2022-08-04CL9896428.4 ppb
2022-08-04CL989654.00 ppb
2022-08-05CL9896620.4 ppb
2022-08-05CL989672.30 ppb
2022-08-05CL9896819.6 ppb
2022-08-05CL9896935.3 ppb
2022-08-05CL9897025.0 ppb
2022-11-17CM902837.60 ppb
2022-11-17CM902848.90 ppb
2022-11-17CM902858.80 ppb
2022-11-17CM9028611.7 ppb
2022-11-17CM9028713.0 ppb
2022-11-17CM902886.20 ppb
2022-11-17CM9028910.2 ppb
2022-11-18CM902905.60 ppb
2023-02-02CN3707712.2 ppb
2023-02-02CN3707823.6 ppb
2023-02-02CN3707921.8 ppb
2023-02-02CN3708011.7 ppb
2023-02-02CN3708120.7 ppb
2023-02-02CN3708217.8 ppb
2023-02-02CN3708320.0 ppb
2023-02-02CN3708416.1 ppb
2023-05-12CO0629423.0 ppb
2023-05-12CO0629532.0 ppb
2023-05-12CO0629626.0 ppb
2023-05-12CO0629735.0 ppb
2023-05-12CO0629836.0 ppb
2023-05-12CO0629941.0 ppb
2023-05-18CO0938621.4 ppb
2023-05-18CO0938737.0 ppb
2023-08-10CO7337622.8 ppb
2023-08-10CO733775.30 ppb
2023-08-10CO733785.50 ppb
2023-08-11CO7337926.0 ppb
2023-08-11CO7338024.4 ppb
2023-08-11CO7338120.5 ppb
2023-08-11CO7338217.2 ppb
2023-08-11CO7338312.5 ppb
2023-11-16CP5044911.2 ppb
2023-11-16CP5045017.5 ppb
2023-11-16CP504519.20 ppb
2023-11-16CP5045213.8 ppb
2023-11-16CP5045311.7 ppb
2023-11-16CP5045413.0 ppb
2023-11-16CP504559.90 ppb
2023-11-17CP5045614.2 ppb