Know Your Environment. Protect Your Health.

Haloacetic acids (HAA5)

CTWC - Unionville 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.

 

97

Samples

1

Samples exceeding legal limit (MCL)

97

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201834.1 ppb161619.0 ppb - 43.8 ppb
201928.8 ppb16168.10 ppb - 48.6 ppb
202024.5 ppb16163.70 ppb - 39.0 ppb
202130.8 ppb17177.90 ppb - 57.7 ppb
202228.7 ppb16164.10 ppb - 63.4 ppb
202332.6 ppb161612.1 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
2018-01-16BZ73287HAA532.0 ppb
2018-01-16BZ73288HAA537.0 ppb
2018-01-16BZ73289HAA537.0 ppb
2018-01-16BZ73286HAA537.0 ppb
2018-04-27CA37381HAA530.0 ppb
2018-04-27CA37382HAA536.0 ppb
2018-04-27CA37383HAA539.0 ppb
2018-04-27CA37384HAA538.0 ppb
2018-07-24CA9673438.0 ppb
2018-07-24CA9673539.0 ppb
2018-07-24CA9673633.0 ppb
2018-07-24CA9673719.0 ppb
2018-10-02DBP 20050766627.5 ppb
2018-10-02DBP 20050802031.4 ppb
2018-10-02DBP 20050766728.5 ppb
2018-10-02DBP 20050766543.8 ppb
2019-01-08DBP 20051813048.6 ppb
2019-01-08DBP 20051813626.5 ppb
2019-01-08DBP 20051813941.4 ppb
2019-01-08DBP 20051814336.8 ppb
2019-04-09DBP 20052784614.2 ppb
2019-04-09DBP 2005278478.10 ppb
2019-04-09DBP 20052784845.3 ppb
2019-04-09DBP 20052784910.6 ppb
2019-07-02DBP 20053898728.1 ppb
2019-07-02DBP 20053898940.8 ppb
2019-07-02DBP 20053898830.4 ppb
2019-07-02DBP 20053898636.8 ppb
2019-10-08DBP 20055201327.5 ppb
2019-10-08DBP 20055201419.2 ppb
2019-10-08DBP 20055201520.4 ppb
2019-10-08DBP 20055201225.5 ppb
2020-01-16DBP 20056340032.4 ppb
2020-01-16DBP 20056340128.7 ppb
2020-01-16DBP 20056340224.0 ppb
2020-01-16DBP 20056340339.0 ppb
2020-04-16DBP 20057292029.2 ppb
2020-04-16DBP 20057292232.9 ppb
2020-04-16DBP 20057291836.5 ppb
2020-04-16DBP 20057291731.2 ppb
2020-07-13DBP 20058248129.8 ppb
2020-07-13DBP 2005824823.70 ppb
2020-07-13DBP 20058248332.9 ppb
2020-07-14DBP 20058284132.8 ppb
2020-10-19DBP 2005944694.20 ppb
2020-10-20DBP 20059484719.1 ppb
2020-10-20DBP 2005948485.90 ppb
2020-10-20DBP 2005948499.40 ppb
2021-01-08DBP 2006034137.90 ppb
2021-01-08DBP 20060341018.2 ppb
2021-01-08DBP 20060341117.4 ppb
2021-01-08DBP 20060341210.9 ppb
2021-04-15DBP 20061365830.2 ppb
2021-04-15DBP 20061365926.4 ppb
2021-04-15DBP 20061366036.3 ppb
2021-04-15DBP 20061366129.5 ppb
2021-07-15DBP 20062513531.4 ppb
2021-07-15DBP 20062513643.7 ppb
2021-07-15DBP 20062513734.4 ppb
2021-07-15DBP 20062513820.2 ppb
2021-07-29DBP 20062667834.8 ppb
2021-10-11H300079421 30007942757.7 ppb
2021-10-11H300079423 30007943138.8 ppb
2021-10-11H300079422 30007942943.0 ppb
2021-10-11H300079420 30007942543.5 ppb
2022-01-13CK1552249.8 ppb
2022-01-13CK1552319.9 ppb
2022-01-13CK1552463.4 ppb
2022-01-13CK1552544.4 ppb
2022-04-08CL0614834.7 ppb
2022-04-08CL061494.60 ppb
2022-04-08CL061504.10 ppb
2022-04-08CL0615116.9 ppb
2022-07-11CL7532735.9 ppb
2022-07-11CL7533031.8 ppb
2022-07-11CL7532810.2 ppb
2022-07-11CL7532938.0 ppb
2022-10-07CM5882024.4 ppb
2022-10-07CM5882124.0 ppb
2022-10-07CM5882226.7 ppb
2022-10-07CM5882330.2 ppb
2023-01-16CN2447936.0 ppb
2023-01-16CN2448020.0 ppb
2023-01-16CN2448132.0 ppb
2023-01-16CN2448212.1 ppb
2023-04-07CN8079114.5 ppb
2023-04-07CN8079320.5 ppb
2023-04-07CN8079236.0 ppb
2023-04-07CN8079034.0 ppb
2023-07-18CO5303434.0 ppb
2023-07-18CO5303542.6 ppb
2023-07-18CO5303638.4 ppb
2023-07-18CO5303740.1 ppb
2023-10-04CP1781139.8 ppb
2023-10-04CP1781241.1 ppb
2023-10-04CP1781344.0 ppb
2023-10-04CP1781437.2 ppb