Know Your Environment. Protect Your Health.

Haloacetic acids (HAA5)

CTWC - Naugatuck Region-Central 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.

 

96

Samples

0

Samples exceeding legal limit (MCL)

96

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201811.0 ppb16161.30 ppb - 23.0 ppb
20197.91 ppb16162.50 ppb - 22.1 ppb
20208.64 ppb16161.40 ppb - 14.3 ppb
202110.0 ppb16164.50 ppb - 19.0 ppb
202212.8 ppb16164.70 ppb - 18.9 ppb
202312.9 ppb16165.70 ppb - 19.2 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
2018-02-14BZ89698HAA523.0 ppb
2018-02-14BZ89699HAA51.50 ppb
2018-02-14BZ89700HAA520.0 ppb
2018-02-14BZ89697HAA516.8 ppb
2018-05-21CA50437HAA510.00 ppb
2018-05-21CA50438HAA520.0 ppb
2018-05-21CA50439HAA520.0 ppb
2018-05-21CA50440HAA515.0 ppb
2018-08-20CB1493920.0 ppb
2018-08-20CB149405.00 ppb
2018-08-20CB149414.70 ppb
2018-08-20CB149421.60 ppb
2018-11-20DBP 2005135041.60 ppb
2018-11-20DBP 2005135341.30 ppb
2018-11-20DBP 20051350611.2 ppb
2018-11-20DBP 2005135023.80 ppb
2019-02-20DBP 20052244722.1 ppb
2019-02-20DBP 20052244812.4 ppb
2019-02-20DBP 2005224492.50 ppb
2019-02-20DBP 20052245012.2 ppb
2019-05-21DBP 2005332578.70 ppb
2019-05-21DBP 2005332586.30 ppb
2019-05-21DBP 2005332595.10 ppb
2019-05-21DBP 2005332605.30 ppb
2019-08-20DBP 2005458914.90 ppb
2019-08-20DBP 2005458939.90 ppb
2019-08-20DBP 2005458924.10 ppb
2019-08-20DBP 2005458907.30 ppb
2019-11-19DBP 2005574054.60 ppb
2019-11-19DBP 2005574064.00 ppb
2019-11-19DBP 2005574079.30 ppb
2019-11-19DBP 2005574047.90 ppb
2020-02-19DBP 20056688012.9 ppb
2020-02-19DBP 20056688113.0 ppb
2020-02-19DBP 2005668821.40 ppb
2020-02-19DBP 2005668839.20 ppb
2020-05-05DBP 2005746298.40 ppb
2020-05-05DBP 20057463010.9 ppb
2020-05-05DBP 20057462814.3 ppb
2020-05-05DBP 20057462712.9 ppb
2020-08-14DBP 2005867179.20 ppb
2020-08-14DBP 2005867218.00 ppb
2020-08-14DBP 20058672211.7 ppb
2020-08-14DBP 2005867234.00 ppb
2020-11-17DBP 2005985296.80 ppb
2020-11-17DBP 2005985305.80 ppb
2020-11-17DBP 2005985314.30 ppb
2020-11-17DBP 2005985325.40 ppb
2021-02-17DBP 20060709111.8 ppb
2021-02-17DBP 2006070888.10 ppb
2021-02-17DBP 2006070897.70 ppb
2021-02-17DBP 2006070905.10 ppb
2021-05-21DBP 2006181749.40 ppb
2021-05-21DBP 2006181759.30 ppb
2021-05-21DBP 20061817610.7 ppb
2021-05-21DBP 20061817312.0 ppb
2021-08-12DBP 20062891910.7 ppb
2021-08-12DBP 2006289209.00 ppb
2021-08-12DBP 20062892110.5 ppb
2021-08-12DBP 2006289224.80 ppb
2021-11-02D300094268 3000942754.50 ppb
2021-11-02D300094267 30009427316.7 ppb
2021-11-02D300094266 30009427111.4 ppb
2021-11-02D300094265 30009426919.0 ppb
2022-02-22CK7305818.1 ppb
2022-02-22CK7305915.1 ppb
2022-02-22CK7306018.9 ppb
2022-02-22CK7306112.7 ppb
2022-05-20CL3607318.6 ppb
2022-05-20CL3607415.8 ppb
2022-05-20CL3607514.2 ppb
2022-05-20CL3607612.0 ppb
2022-08-03CL9638315.9 ppb
2022-08-03CL9638112.9 ppb
2022-08-03CL9638015.9 ppb
2022-08-03CL9638210.5 ppb
2022-11-04CM792857.60 ppb
2022-11-04CM792866.30 ppb
2022-11-04CM792875.70 ppb
2022-11-04CM792884.70 ppb
2023-02-09CN414418.50 ppb
2023-02-09CN414428.30 ppb
2023-02-09CN4144310.2 ppb
2023-02-09CN414445.70 ppb
2023-05-08CO0164512.2 ppb
2023-05-08CO016479.50 ppb
2023-05-08CO0164617.5 ppb
2023-05-08CO0164415.9 ppb
2023-08-04CO6817012.8 ppb
2023-08-04CO6817112.5 ppb
2023-08-04CO6817210.7 ppb
2023-08-04CO6817313.9 ppb
2023-11-03CP4146319.2 ppb
2023-11-03CP4146417.7 ppb
2023-11-03CP4146514.4 ppb
2023-11-03CP4146617.6 ppb