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EWG's Tap Water Database — 2021 UPDATE

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Haloacetic acids (HAA5)

City of Asheville

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

3

Samples exceeding legal limit (MCL)

192

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201430.3 ppb323218.0 ppb - 42.0 ppb
201532.2 ppb323218.0 ppb - 52.0 ppb
201629.8 ppb323214.0 ppb - 43.0 ppb
201733.8 ppb323218.0 ppb - 63.0 ppb
201834.4 ppb323216.0 ppb - 64.0 ppb
201931.1 ppb323216.0 ppb - 60.0 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
2014-02-1037729_14-0398823.0 ppb
2014-02-1037729_14-0398936.0 ppb
2014-02-1037729_14-0399030.0 ppb
2014-02-1037729_14-0399123.0 ppb
2014-02-1037729_14-0399232.0 ppb
2014-02-1037729_14-0399326.0 ppb
2014-02-1037729_14-0399423.0 ppb
2014-02-1037729_14-0399535.0 ppb
2014-05-0637729_14-1261322.0 ppb
2014-05-0637729_14-1261433.0 ppb
2014-05-0637729_14-1261528.0 ppb
2014-05-0637729_14-1261623.0 ppb
2014-05-0637729_14-1261731.0 ppb
2014-05-0637729_14-1261821.0 ppb
2014-05-0637729_14-1261919.0 ppb
2014-05-0637729_14-1262031.0 ppb
2014-08-0437729_14-2313818.0 ppb
2014-08-0437729_14-2313918.0 ppb
2014-08-0437729_14-2314031.0 ppb
2014-08-0437729_14-2314136.0 ppb
2014-08-0437729_14-2314227.0 ppb
2014-08-0437729_14-2314339.0 ppb
2014-08-0437729_14-2314429.0 ppb
2014-08-0437729_14-2314524.0 ppb
2014-11-0537729_14-3366139.0 ppb
2014-11-0537729_14-3366240.0 ppb
2014-11-0537729_14-3366334.0 ppb
2014-11-0537729_14-3366438.0 ppb
2014-11-0537729_14-3366542.0 ppb
2014-11-0537729_14-3366638.0 ppb
2014-11-0537729_14-3366738.0 ppb
2014-11-0537729_14-3366841.0 ppb
2015-02-0337.0 ppb
2015-02-0326.0 ppb
2015-02-0319.0 ppb
2015-02-0329.0 ppb
2015-02-0328.0 ppb
2015-02-0331.0 ppb
2015-02-0331.0 ppb
2015-02-0329.0 ppb
2015-05-1237.0 ppb
2015-05-1228.0 ppb
2015-05-1218.0 ppb
2015-05-1228.0 ppb
2015-05-1222.0 ppb
2015-05-1224.0 ppb
2015-05-1233.0 ppb
2015-05-1225.0 ppb
2015-08-0528.0 ppb
2015-08-0525.0 ppb
2015-08-0524.0 ppb
2015-08-0526.0 ppb
2015-08-0535.0 ppb
2015-08-0535.0 ppb
2015-08-0543.0 ppb
2015-08-0520.0 ppb
2015-11-0338.0 ppb
2015-11-0330.0 ppb
2015-11-0348.0 ppb
2015-11-0343.0 ppb
2015-11-0342.0 ppb
2015-11-0352.0 ppb
2015-11-0349.0 ppb
2015-11-0347.0 ppb
2016-02-0437729_16-0366037.0 ppb
2016-02-0437729_16-0366130.0 ppb
2016-02-0437729_16-0366220.0 ppb
2016-02-0437729_16-0366332.0 ppb
2016-02-0437729_16-0366427.0 ppb
2016-02-0437729_16-0366539.0 ppb
2016-02-0437729_16-0366635.0 ppb
2016-02-0437729_16-0366724.0 ppb
2016-05-0237729_16-1376622.0 ppb
2016-05-0237729_16-1376736.0 ppb
2016-05-0237729_16-1376838.0 ppb
2016-05-0237729_16-1376930.0 ppb
2016-05-0237729_16-1377034.0 ppb
2016-05-0237729_16-1377123.0 ppb
2016-05-0237729_16-1377228.0 ppb
2016-05-0237729_16-1377323.0 ppb
2016-08-0337729_16-2642821.0 ppb
2016-08-0337729_16-2642936.0 ppb
2016-08-0337729_16-2643033.0 ppb
2016-08-0337729_16-2643125.0 ppb
2016-08-0337729_16-2642334.0 ppb
2016-08-0337729_16-2642514.0 ppb
2016-08-0337729_16-2642622.0 ppb
2016-08-0337729_16-2642735.0 ppb
2016-11-0737729_16-3889343.0 ppb
2016-11-0737729_16-3889433.0 ppb
2016-11-0737729_16-3889535.0 ppb
2016-11-0737729_16-3889635.0 ppb
2016-11-0737729_16-3890039.0 ppb
2016-11-0737729_16-3890124.0 ppb
2016-11-0737729_16-3890826.0 ppb
2016-11-0737729_16-3891421.0 ppb
2017-02-0137729_17-0378030.0 ppb
2017-02-0137729_17-0378124.0 ppb
2017-02-0137729_17-0378240.0 ppb
2017-02-0137729_17-0378332.0 ppb
2017-02-0137729_17-0378424.0 ppb
2017-02-0137729_17-0378538.0 ppb
2017-02-0137729_17-0378623.0 ppb
2017-02-0137729_17-0378720.0 ppb
2017-05-0837729_17-1519529.0 ppb
2017-05-0837729_17-1519623.0 ppb
2017-05-0837729_17-1519726.0 ppb
2017-05-0837729_17-1519831.0 ppb
2017-05-0837729_17-1519922.0 ppb
2017-05-0837729_17-1520029.0 ppb
2017-05-0837729_17-1520136.0 ppb
2017-05-0837729_17-1520220.0 ppb
2017-08-0937729_17-2847137.0 ppb
2017-08-0937729_17-2848118.0 ppb
2017-08-0937729_17-2848235.0 ppb
2017-08-0937729_17-2848325.0 ppb
2017-08-0937729_17-2848425.0 ppb
2017-08-0937729_17-2848540.0 ppb
2017-08-0937729_17-2848641.0 ppb
2017-08-0937729_17-2848730.0 ppb
2017-11-0837729_17-4228159.0 ppb
2017-11-0837729_17-4228229.0 ppb
2017-11-0837729_17-4228332.0 ppb
2017-11-0837729_17-4228438.0 ppb
2017-11-0837729_17-4228552.0 ppb
2017-11-0837729_17-4228663.0 ppb
2017-11-0837729_17-4228759.0 ppb
2017-11-0837729_17-4228850.0 ppb
2018-02-1337729_18-05844 37.0 ppb
2018-02-1337729_18-05845 29.0 ppb
2018-02-1337729_18-05846 20.0 ppb
2018-02-1337729_18-05847 31.0 ppb
2018-02-1337729_18-05848 28.0 ppb
2018-02-1337729_18-05849 35.0 ppb
2018-02-1337729_18-05850 36.0 ppb
2018-02-1337729_18-05851 30.0 ppb
2018-05-0937729_18-18806 32.0 ppb
2018-05-0937729_18-18807 25.0 ppb
2018-05-0937729_18-18808 19.0 ppb
2018-05-0937729_18-18809 33.0 ppb
2018-05-0937729_18-18810 23.0 ppb
2018-05-0937729_18-18811 35.0 ppb
2018-05-0937729_18-18812 28.0 ppb
2018-05-0937729_18-18813 23.0 ppb
2018-08-0637729_18-31982 37.0 ppb
2018-08-0637729_18-31983 16.0 ppb
2018-08-0637729_18-31984 29.0 ppb
2018-08-0637729_18-31985 37.0 ppb
2018-08-0637729_18-31986 27.0 ppb
2018-08-0637729_18-31987 37.0 ppb
2018-08-0637729_18-31988 35.0 ppb
2018-08-0637729_18-31989 25.0 ppb
2018-11-0537729_18-45873 60.0 ppb
2018-11-0537729_18-45874 42.0 ppb
2018-11-0537729_18-45875 40.0 ppb
2018-11-0537729_18-45876 38.0 ppb
2018-11-0537729_18-45877 43.0 ppb
2018-11-0537729_18-45878 63.0 ppb
2018-11-0537729_18-45879 64.0 ppb
2018-11-0537729_18-45880 44.0 ppb
2019-02-0637729_19-05662 35.0 ppb
2019-02-0637729_19-05663 23.0 ppb
2019-02-0637729_19-05664 16.0 ppb
2019-02-0637729_19-05665 28.0 ppb
2019-02-0637729_19-05666 20.0 ppb
2019-02-0637729_19-05667 26.0 ppb
2019-02-0637729_19-05668 26.0 ppb
2019-02-0637729_19-05669 20.0 ppb
2019-05-0637729_19-18135 19.0 ppb
2019-05-0637729_19-18136 19.0 ppb
2019-05-0637729_19-18140 25.0 ppb
2019-05-0637729_19-18141 28.0 ppb
2019-05-0637729_19-18142 17.0 ppb
2019-05-0637729_19-18143 27.0 ppb
2019-05-0637729_19-18144 34.0 ppb
2019-05-0637729_19-18145 20.0 ppb
2019-08-0637729_19-33272 40.0 ppb
2019-08-0637729_19-33273 20.0 ppb
2019-08-0637729_19-33274 40.0 ppb
2019-08-0637729_19-33275 35.0 ppb
2019-08-0637729_19-33276 29.0 ppb
2019-08-0637729_19-33277 33.0 ppb
2019-08-0637729_19-33278 34.0 ppb
2019-08-0637729_19-33279 25.0 ppb
2019-11-0437729_19-47095 55.0 ppb
2019-11-0437729_19-47096 21.0 ppb
2019-11-0437729_19-47097 44.0 ppb
2019-11-0437729_19-47098 39.0 ppb
2019-11-0437729_19-47099 40.0 ppb
2019-11-0437729_19-47100 60.0 ppb
2019-11-0437729_19-47101 60.0 ppb
2019-11-0437729_19-47102 37.0 ppb