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EWG's Tap Water Database — 2021 UPDATE

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Haloacetic acids (HAA5)

CTWC - Shoreline Region-Guilford 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

 

96

Samples

0

Samples exceeding legal limit (MCL)

96

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201416.7 ppb16162.00 ppb - 27.0 ppb
201519.8 ppb161610.3 ppb - 24.0 ppb
201615.5 ppb16167.00 ppb - 22.0 ppb
201723.5 ppb161611.0 ppb - 37.0 ppb
201816.5 ppb16165.40 ppb - 33.0 ppb
201911.7 ppb16165.50 ppb - 18.6 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
2014-03-213483HAA52.20 ppb
2014-03-213484HAA526.0 ppb
2014-03-213485HAA526.0 ppb
2014-03-213482HAA523.0 ppb
2014-06-1887612HAA52.00 ppb
2014-06-188761HAA52.00 ppb
2014-06-188764HAA518.0 ppb
2014-06-188765HAA518.0 ppb
2014-09-15BH14101HAA514.7 ppb
2014-09-15BH14102HAA513.0 ppb
2014-09-15BH14103HAA518.0 ppb
2014-09-15BH14104HAA513.7 ppb
2014-12-17BH54709HAA520.0 ppb
2014-12-17BH54711HAA527.0 ppb
2014-12-17BH54710HAA526.0 ppb
2014-12-17BH54708HAA518.0 ppb
2015-03-11BH82212HAA515.7 ppb
2015-03-11BH82209HAA510.3 ppb
2015-03-11BH82210HAA512.9 ppb
2015-03-11BH82211HAA515.1 ppb
2015-06-16BJ31715HAA520.0 ppb
2015-06-16BJ31716HAA524.0 ppb
2015-06-16BJ31718HAA524.0 ppb
2015-06-16BJ31717HAA523.0 ppb
2015-09-15BJ92119HAA520.0 ppb
2015-09-15BJ92120HAA520.0 ppb
2015-09-15BJ92122HAA519.0 ppb
2015-09-15BJ92121HAA522.0 ppb
2015-12-08BK34310HAA522.0 ppb
2015-12-08BK34311HAA524.0 ppb
2015-12-08BK34309HAA522.0 ppb
2015-12-08BK34312HAA522.0 ppb
2016-03-15BK78696HAA513.8 ppb
2016-03-15BK78697HAA513.0 ppb
2016-03-15BK78692HAA514.0 ppb
2016-03-15BK78693HAA59.80 ppb
2016-06-14BN54618HAA522.0 ppb
2016-06-14BN54619HAA522.0 ppb
2016-06-14BN54617HAA514.7 ppb
2016-06-14BN54616HAA519.0 ppb
2016-09-14BV14928HAA512.6 ppb
2016-09-14BV14929HAA511.7 ppb
2016-09-14BV14930HAA511.6 ppb
2016-09-14BV14931HAA520.0 ppb
2016-12-15BX06134HAA520.0 ppb
2016-12-15BX06135HAA517.0 ppb
2016-12-15BX06136HAA57.00 ppb
2016-12-15BX06137HAA519.0 ppb
2017-03-17BX89078HAA515.3 ppb
2017-03-17BX89073HAA511.0 ppb
2017-03-17BX89076HAA517.6 ppb
2017-03-17BX89077HAA517.4 ppb
2017-06-19BY42241HAA530.0 ppb
2017-06-19BY42242HAA537.0 ppb
2017-06-19BY42243HAA528.0 ppb
2017-06-19BY42240HAA531.0 ppb
2017-09-14BZ02387HAA520.0 ppb
2017-09-14BZ02388HAA519.0 ppb
2017-09-14BZ02389HAA518.0 ppb
2017-09-14BZ02390HAA525.0 ppb
2017-12-14BZ60234HAA529.0 ppb
2017-12-14BZ60233HAA520.0 ppb
2017-12-14BZ60232HAA530.0 ppb
2017-12-14BZ60231HAA528.0 ppb
2018-03-15CA03073HAA513.0 ppb
2018-03-15CA03074HAA510.5 ppb
2018-03-15CA03075HAA515.9 ppb
2018-03-15CA03076HAA516.0 ppb
2018-06-26CA80045HAA533.0 ppb
2018-06-26CA80046HAA523.0 ppb
2018-06-26CA80047HAA522.0 ppb
2018-06-26CA80048HAA522.0 ppb
2018-09-12DBP 20050504716.6 ppb
2018-09-12DBP 20050504316.3 ppb
2018-09-12DBP 20050504223.4 ppb
2018-09-12DBP 20050504424.2 ppb
2018-12-17DBP 2005162356.10 ppb
2018-12-17DBP 2005162375.40 ppb
2018-12-17DBP 2005162388.30 ppb
2018-12-17DBP 2005162398.30 ppb
2019-03-11DBP 2005241505.50 ppb
2019-03-11DBP 2005241517.40 ppb
2019-03-11DBP 2005241529.40 ppb
2019-03-11DBP 2005241549.90 ppb
2019-06-14DBP 20053667411.3 ppb
2019-06-14DBP 20053668213.5 ppb
2019-06-14DBP 20053668012.0 ppb
2019-06-14DBP 2005366729.10 ppb
2019-09-17DBP 20054947811.7 ppb
2019-09-17DBP 20054947913.8 ppb
2019-09-17DBP 20054948010.2 ppb
2019-09-17DBP 20054948111.0 ppb
2019-12-10DBP 20055964212.8 ppb
2019-12-10DBP 20055964318.6 ppb
2019-12-10DBP 20055964415.6 ppb
2019-12-10DBP 20055964515.9 ppb