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EWG's Tap Water Database — 2021 UPDATE

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Haloacetic acids (HAA5)

University of Connecticut - Main Campus

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

 

116

Samples

0

Samples exceeding legal limit (MCL)

82

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.719 ppb166ND - 3.80 ppb
20152.31 ppb1611ND - 11.2 ppb
20162.43 ppb1613ND - 5.90 ppb
20173.68 ppb2017ND - 12.0 ppb
20183.10 ppb2417ND - 8.30 ppb
20193.12 ppb2418ND - 12.2 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
2014-03-10BG17096HAA5ND
2014-03-10BG17099HAA5ND
2014-03-10BG17101HAA5ND
2014-03-10BG17102HAA5ND
2014-06-12BG56337HAA5ND
2014-06-12BG56340HAA51.60 ppb
2014-06-12BG56345HAA5ND
2014-06-12BG56346HAA53.80 ppb
2014-09-16BH14164HAA51.30 ppb
2014-09-16BH14167HAA5ND
2014-09-16BH14172HAA51.30 ppb
2014-09-16BH14173HAA51.10 ppb
2014-12-10BH51407HAA52.40 ppb
2014-12-10BH51410HAA5ND
2014-12-10BH51415HAA5ND
2014-12-10BH51416HAA5ND
2015-03-09BH80473HAA5ND
2015-03-09BH80470HAA5ND
2015-03-12BH82672HAA51.000 ppb
2015-03-12BH82671HAA51.000 ppb
2015-06-08BJ27397HAA53.40 ppb
2015-06-08BJ27390HAA52.00 ppb
2015-06-08BJ27393HAA54.10 ppb
2015-06-08BJ27398HAA5ND
2015-09-22BJ95541HAA5ND
2015-09-22BJ95542HAA5ND
2015-09-22BJ95540HAA54.20 ppb
2015-09-22BJ95539HAA511.2 ppb
2015-12-09BK34675HAA52.50 ppb
2015-12-09BK34680HAA52.40 ppb
2015-12-09BK34678HAA52.60 ppb
2015-12-09BK34679HAA52.60 ppb
2016-03-09BK75989HAA5ND
2016-03-09BK75990HAA5ND
2016-03-09BK75991HAA5ND
2016-03-09BK75992HAA52.70 ppb
2016-06-09BN51405HAA51.20 ppb
2016-06-09BN51408HAA53.70 ppb
2016-06-09BN51412HAA53.00 ppb
2016-06-09BN51413HAA51.20 ppb
2016-09-21BV20288HAA53.00 ppb
2016-09-21BV20289HAA53.00 ppb
2016-09-21BV20290HAA53.00 ppb
2016-09-21BV20291HAA51.000 ppb
2016-12-13BX04254HAA55.00 ppb
2016-12-13BX04255HAA55.90 ppb
2016-12-13BX04256HAA55.00 ppb
2016-12-13BX04257HAA51.20 ppb
2017-03-08BX81804HAA55.00 ppb
2017-03-08BX81805HAA55.00 ppb
2017-03-08BX81806HAA512.0 ppb
2017-03-08BX81807HAA53.10 ppb
2017-06-13BY38124HAA55.00 ppb
2017-06-13BY38125HAA56.00 ppb
2017-06-13BY38126HAA51.20 ppb
2017-06-13BY38127HAA5ND
2017-08-09BY81246HAA55.80 ppb
2017-08-09BY81247HAA51.40 ppb
2017-08-09BY81248HAA5ND
2017-08-10BY82233HAA55.00 ppb
2017-09-05BY94975HAA56.90 ppb
2017-09-05BY94976HAA54.20 ppb
2017-09-06BY95732HAA53.60 ppb
2017-09-07BY96696HAA5ND
2017-12-12BZ58240HAA54.00 ppb
2017-12-12BZ58241HAA51.10 ppb
2017-12-12BZ58242HAA53.10 ppb
2017-12-12BZ58243HAA51.10 ppb
2018-03-15CA02987HAA57.30 ppb
2018-03-15CA02988HAA52.90 ppb
2018-03-15CA02989HAA58.30 ppb
2018-03-15CA02990HAA5ND
2018-06-12CA68568HAA56.60 ppb
2018-06-12CA68569HAA56.90 ppb
2018-06-12CA68570HAA56.00 ppb
2018-06-12CA68571HAA5ND
2018-09-19DBP 2005061824.80 ppb
2018-09-19DBP 200506184ND
2018-09-19DBP 2005061860.600 ppb
2018-09-19DBP 2005061892.60 ppb
2018-09-25DBP 2005067204.80 ppb
2018-09-25DBP 200506721ND
2018-09-25DBP 2005067220.600 ppb
2018-09-25DBP 2005067234.10 ppb
2018-09-26DBP 200506966ND
2018-09-27DBP 2005070732.20 ppb
2018-12-04DBP 2005147243.00 ppb
2018-12-04DBP 200514725ND
2018-12-04DBP 2005147260.600 ppb
2018-12-04DBP 2005147287.00 ppb
2018-12-17DBP 2005162816.20 ppb
2018-12-17DBP 200516282ND
2019-03-18DBP 2005250245.10 ppb
2019-03-18DBP 2005250266.80 ppb
2019-03-18DBP 2005250294.80 ppb
2019-03-18DBP 2005250310.700 ppb
2019-03-18DBP 2005250335.30 ppb
2019-03-18DBP 200525034ND
2019-06-24DBP 2005375410.800 ppb
2019-06-24DBP 2005375422.80 ppb
2019-06-24DBP 200537543ND
2019-06-25DBP 2005378064.70 ppb
2019-06-25DBP 2005378076.40 ppb
2019-06-25DBP 2005378081.20 ppb
2019-09-16DBP 2005490013.60 ppb
2019-09-16DBP 2005490021.60 ppb
2019-09-16DBP 2005490401.50 ppb
2019-09-16DBP 200549041ND
2019-09-16DBP 2005490432.20 ppb
2019-09-16DBP 200549044ND
2019-12-09DBP 2005594125.40 ppb
2019-12-09DBP 2005594163.70 ppb
2019-12-09DBP 200559419ND
2019-12-09DBP 20055942212.2 ppb
2019-12-09DBP 2005594256.00 ppb
2019-12-09DBP 200559427ND