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EWG's Tap Water Database — 2021 UPDATE

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Haloacetic acids (HAA5)

Appalachian State Univ WTP

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

 

103

Samples

18

Samples exceeding legal limit (MCL)

103

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201440.1 ppb161628.0 ppb - 47.0 ppb
201550.6 ppb161630.0 ppb - 77.0 ppb
201641.1 ppb161630.0 ppb - 47.0 ppb
201755.3 ppb161641.0 ppb - 74.0 ppb
201853.4 ppb232329.0 ppb - 69.0 ppb
201938.8 ppb161627.0 ppb - 56.0 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
2014-01-3137729_14-0313628.0 ppb
2014-01-3137729_14-0313728.0 ppb
2014-01-3137729_14-0313832.0 ppb
2014-01-3137729_14-0313929.0 ppb
2014-05-0537729_14-1241943.0 ppb
2014-05-0537729_14-1242043.0 ppb
2014-05-0537729_14-1242139.0 ppb
2014-05-0537729_14-1242239.0 ppb
2014-07-2837729_14-2234242.0 ppb
2014-07-2837729_14-2234345.0 ppb
2014-07-2837729_14-2234446.0 ppb
2014-07-2837729_14-2234547.0 ppb
2014-10-2137729_14-3204243.0 ppb
2014-10-2137729_14-3204345.0 ppb
2014-10-2137729_14-3204447.0 ppb
2014-10-2137729_14-3204546.0 ppb
2015-01-2146.0 ppb
2015-01-2130.0 ppb
2015-01-2139.0 ppb
2015-01-2131.0 ppb
2015-04-2335.0 ppb
2015-04-2339.0 ppb
2015-04-2335.0 ppb
2015-04-2335.0 ppb
2015-07-0858.0 ppb
2015-07-0857.0 ppb
2015-07-0852.0 ppb
2015-07-0853.0 ppb
2015-10-1476.0 ppb
2015-10-1476.0 ppb
2015-10-1470.0 ppb
2015-10-1477.0 ppb
2016-01-2837729_16-0284145.0 ppb
2016-01-2837729_16-0284245.0 ppb
2016-01-2837729_16-0284346.0 ppb
2016-01-2837729_16-0284447.0 ppb
2016-04-2737729_16-1316347.0 ppb
2016-04-2737729_16-1316446.0 ppb
2016-04-2737729_16-1316547.0 ppb
2016-04-2737729_16-1316644.0 ppb
2016-07-2637729_16-2480832.0 ppb
2016-07-2637729_16-2480939.0 ppb
2016-07-2637729_16-2481035.0 ppb
2016-07-2637729_16-2481130.0 ppb
2016-10-2637729_16-3744934.0 ppb
2016-10-2637729_16-3745043.0 ppb
2016-10-2637729_16-3745139.0 ppb
2016-10-2637729_16-3745239.0 ppb
2017-01-3037729_17-0333346.0 ppb
2017-01-3137729_17-0333441.0 ppb
2017-01-3137729_17-0333545.0 ppb
2017-01-3137729_17-0333644.0 ppb
2017-04-2637729_17-1385551.0 ppb
2017-04-2637729_17-1385652.0 ppb
2017-04-2637729_17-1385750.0 ppb
2017-04-2637729_17-1385850.0 ppb
2017-07-1837729_17-2478157.0 ppb
2017-07-1837729_17-2478258.0 ppb
2017-07-1837729_17-2478361.0 ppb
2017-07-1837729_17-2478474.0 ppb
2017-10-2537729_17-4017064.0 ppb
2017-10-2537729_17-4017169.0 ppb
2017-10-2537729_17-4017256.0 ppb
2017-10-2537729_17-4017366.0 ppb
2018-01-2537729_18-03304 69.0 ppb
2018-01-2537729_18-03305 63.0 ppb
2018-01-2537729_18-03306 65.0 ppb
2018-01-2537729_18-03307 63.0 ppb
2018-04-1037729_18-13909 54.0 ppb
2018-04-1037729_18-13910 57.0 ppb
2018-04-1037729_18-13911 59.0 ppb
2018-04-1037729_18-13912 63.0 ppb
2018-06-2737729_18-26233 68.0 ppb
2018-06-2737729_18-26234 67.0 ppb
2018-06-2737729_18-26235 69.0 ppb
2018-07-1937729_18-29589 40.0 ppb
2018-07-1937729_18-29590 46.0 ppb
2018-07-1937729_18-29591 44.0 ppb
2018-07-1937729_18-29592 49.0 ppb
2018-10-2337729_18-44087 57.0 ppb
2018-10-2337729_18-44088 56.0 ppb
2018-10-2337729_18-44089 57.0 ppb
2018-10-2337729_18-44090 63.0 ppb
2018-12-0537729_18-50959 31.0 ppb
2018-12-0537729_18-50960 29.0 ppb
2018-12-0537729_18-50961 29.0 ppb
2018-12-0537729_18-50962 31.0 ppb
2019-01-3037729_19-04371 31.0 ppb
2019-01-3037729_19-04374 31.0 ppb
2019-01-3037729_19-04375 31.0 ppb
2019-01-3037729_19-04376 31.0 ppb
2019-04-1037729_19-14814 28.0 ppb
2019-04-1037729_19-14815 34.0 ppb
2019-04-1037729_19-14816 27.0 ppb
2019-04-1037729_19-14817 29.0 ppb
2019-07-2337729_19-30874 50.0 ppb
2019-07-2337729_19-30875 40.0 ppb
2019-07-2337729_19-30876 40.0 ppb
2019-07-2337729_19-30877 40.0 ppb
2019-10-2237729_19-45545 52.0 ppb
2019-10-2237729_19-45546 46.0 ppb
2019-10-2237729_19-45547 55.0 ppb
2019-10-2237729_19-45548 56.0 ppb