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EWG's Tap Water Database — 2021 UPDATE

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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.

MORE ABOUT THIS CONTAMINANT

 

192

Samples

0

Samples exceeding legal limit (MCL)

191

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
201413.0 ppb32321.60 ppb - 25.0 ppb
201510.8 ppb32321.70 ppb - 21.0 ppb
201610.5 ppb32322.40 ppb - 20.0 ppb
201714.3 ppb32324.20 ppb - 30.0 ppb
201816.4 ppb3231ND - 35.0 ppb
201914.1 ppb32321.30 ppb - 27.0 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

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
2014-02-041747HAA517.0 ppb
2014-02-041748HAA59.00 ppb
2014-02-041749HAA522.0 ppb
2014-02-041750HAA55.00 ppb
2014-02-041751HAA518.0 ppb
2014-02-041752HAA520.0 ppb
2014-02-041753HAA525.0 ppb
2014-02-041754HAA518.0 ppb
2014-05-063067HAA513.0 ppb
2014-05-066107HAA515.0 ppb
2014-05-066108HAA516.0 ppb
2014-05-066109HAA514.0 ppb
2014-05-066110HAA516.0 ppb
2014-05-066112HAA58.00 ppb
2014-05-066113HAA517.0 ppb
2014-05-066114HAA516.0 ppb
2014-08-05BG88648HAA511.0 ppb
2014-08-05BG88649HAA510.9 ppb
2014-08-05BG88650HAA511.4 ppb
2014-08-05BG88651HAA512.1 ppb
2014-08-05BG88652HAA510.3 ppb
2014-08-05BG88653HAA54.20 ppb
2014-08-05BG88654HAA59.90 ppb
2014-08-05BG88655HAA55.00 ppb
2014-11-25BH46470HAA51.60 ppb
2014-11-25BH46471HAA513.8 ppb
2014-11-25BH46472HAA514.0 ppb
2014-11-25BH46473HAA520.0 ppb
2014-11-25BH46474HAA510.00 ppb
2014-11-25BH46475HAA56.30 ppb
2014-11-25BH46476HAA513.0 ppb
2014-11-25BH46477HAA512.7 ppb
2015-02-25BH77222HAA513.4 ppb
2015-02-25BH77224HAA56.30 ppb
2015-02-25BH77226HAA510.6 ppb
2015-02-25BH77225HAA513.4 ppb
2015-02-25BH77223HAA521.0 ppb
2015-02-25BH77220HAA520.0 ppb
2015-02-25BH77221HAA518.6 ppb
2015-02-25BH77219HAA54.30 ppb
2015-05-21BJ20486HAA57.00 ppb
2015-05-21BJ20481HAA51.70 ppb
2015-05-21BJ20485HAA511.7 ppb
2015-05-21BJ20488HAA58.10 ppb
2015-05-21BJ20482HAA58.00 ppb
2015-05-21BJ20487HAA56.70 ppb
2015-05-21BJ20484HAA520.0 ppb
2015-05-21BJ20483HAA59.10 ppb
2015-08-20BJ78786HAA53.90 ppb
2015-08-20BJ78781HAA57.50 ppb
2015-08-20BJ78784HAA512.4 ppb
2015-08-20BJ78783HAA511.1 ppb
2015-08-20BJ78787HAA512.6 ppb
2015-08-20BJ78788HAA512.7 ppb
2015-08-20BJ78782HAA58.10 ppb
2015-08-20BJ78785HAA56.00 ppb
2015-11-24BK27966HAA59.00 ppb
2015-11-24BK27973HAA512.1 ppb
2015-11-24BK27967HAA516.5 ppb
2015-11-24BK27968HAA514.0 ppb
2015-11-24BK27972HAA510.00 ppb
2015-11-24BK27970HAA59.60 ppb
2015-11-24BK27971HAA55.40 ppb
2015-11-24BK27969HAA514.6 ppb
2016-02-04BK61857HAA59.00 ppb
2016-02-04BK61858HAA515.7 ppb
2016-02-04BK61859HAA516.9 ppb
2016-02-04BK61860HAA520.0 ppb
2016-02-04BK61861HAA518.0 ppb
2016-02-04BK61862HAA58.00 ppb
2016-02-04BK61863HAA511.4 ppb
2016-02-04BK61864HAA511.0 ppb
2016-05-05BN26300HAA52.80 ppb
2016-05-05BN26301HAA517.0 ppb
2016-05-05BN26302HAA520.0 ppb
2016-05-05BN26303HAA520.0 ppb
2016-05-05BN26304HAA517.0 ppb
2016-05-05BN26305HAA52.40 ppb
2016-05-05BN26306HAA59.90 ppb
2016-05-05BN26307HAA512.0 ppb
2016-08-18BN94948HAA58.00 ppb
2016-08-18BN94949HAA56.90 ppb
2016-08-18BN94950HAA52.70 ppb
2016-08-18BN94951HAA59.90 ppb
2016-08-18BN94952HAA53.50 ppb
2016-08-18BN94953HAA53.00 ppb
2016-08-18BN94954HAA511.4 ppb
2016-08-18BN94955HAA59.10 ppb
2016-11-03BV75338HAA56.50 ppb
2016-11-03BV75339HAA512.0 ppb
2016-11-03BV75340HAA58.20 ppb
2016-11-03BV75341HAA511.0 ppb
2016-11-03BV75342HAA58.80 ppb
2016-11-03BV75343HAA56.90 ppb
2016-11-03BV75344HAA58.20 ppb
2016-11-03BV75345HAA59.60 ppb
2017-02-02BX44867HAA55.00 ppb
2017-02-02BX44868HAA514.1 ppb
2017-02-02BX44869HAA513.0 ppb
2017-02-02BX44870HAA516.0 ppb
2017-02-02BX44871HAA517.0 ppb
2017-02-02BX44872HAA54.20 ppb
2017-02-02BX44873HAA513.5 ppb
2017-02-02BX44874HAA514.2 ppb
2017-05-04BY15439HAA56.00 ppb
2017-05-04BY15440HAA515.0 ppb
2017-05-04BY15441HAA510.1 ppb
2017-05-04BY15442HAA523.0 ppb
2017-05-04BY15443HAA521.0 ppb
2017-05-04BY15444HAA57.60 ppb
2017-05-04BY15445HAA514.1 ppb
2017-05-04BY15446HAA512.0 ppb
2017-08-07BY79801HAA57.00 ppb
2017-08-07BY79802HAA515.0 ppb
2017-08-07BY79803HAA512.5 ppb
2017-08-07BY79804HAA519.9 ppb
2017-08-07BY79805HAA511.0 ppb
2017-08-07BY79806HAA514.4 ppb
2017-08-07BY79807HAA516.2 ppb
2017-08-07BY79808HAA514.0 ppb
2017-11-06BZ33918HAA530.0 ppb
2017-11-16BZ43465HAA512.1 ppb
2017-11-16BZ43466HAA519.0 ppb
2017-11-16BZ43467HAA519.0 ppb
2017-11-16BZ43468HAA55.40 ppb
2017-11-16BZ43469HAA514.5 ppb
2017-11-16BZ43470HAA523.0 ppb
2017-11-16BZ43471HAA520.0 ppb
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