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EWG's Tap Water Database — 2021 UPDATE

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Haloacetic acids (HAA5)

Town of Oak Island

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.

 

96

Samples

4

Samples exceeding legal limit (MCL)

95

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201415.9 ppb161610.00 ppb - 19.0 ppb
201518.8 ppb161615.0 ppb - 22.0 ppb
201622.6 ppb161611.0 ppb - 54.0 ppb
201717.3 ppb16167.00 ppb - 21.0 ppb
201837.5 ppb1615ND - 90.0 ppb
201916.0 ppb161610.00 ppb - 24.0 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
2014-03-1237729_14-0720816.0 ppb
2014-03-1237729_14-0720919.0 ppb
2014-03-1237729_14-0721016.0 ppb
2014-03-1237729_14-0720719.0 ppb
2014-06-1137729_14-1680315.0 ppb
2014-06-1137729_14-1680413.0 ppb
2014-06-1137729_14-1680515.0 ppb
2014-06-1137729_14-1680618.0 ppb
2014-09-1037729_14-2749010.00 ppb
2014-09-1037729_14-2749117.0 ppb
2014-09-1037729_14-2749211.0 ppb
2014-09-1037729_14-2749315.0 ppb
2014-12-1037729_14-3738419.0 ppb
2014-12-1037729_14-3738714.0 ppb
2014-12-1037729_14-3738619.0 ppb
2014-12-1037729_14-3738518.0 ppb
2015-03-1118.0 ppb
2015-03-1119.0 ppb
2015-03-1121.0 ppb
2015-03-1118.0 ppb
2015-06-1719.0 ppb
2015-06-1717.0 ppb
2015-06-1717.0 ppb
2015-06-1720.0 ppb
2015-09-1621.0 ppb
2015-09-1621.0 ppb
2015-09-1619.0 ppb
2015-09-1622.0 ppb
2015-12-0915.0 ppb
2015-12-0918.0 ppb
2015-12-0916.0 ppb
2015-12-0919.0 ppb
2016-03-1637729_16-0835614.0 ppb
2016-03-1637729_16-0835712.0 ppb
2016-03-1637729_16-0835813.0 ppb
2016-03-1637729_16-0835914.0 ppb
2016-06-1537729_16-1928213.0 ppb
2016-06-1537729_16-1928311.0 ppb
2016-06-1537729_16-1928115.0 ppb
2016-06-1537729_16-1927915.0 ppb
2016-09-1437729_16-3194931.0 ppb
2016-09-1437729_16-3195017.0 ppb
2016-09-1437729_16-3195116.0 ppb
2016-09-1437729_16-3195231.0 ppb
2016-12-1437729_16-4343341.0 ppb
2016-12-1437729_16-4343454.0 ppb
2016-12-1437729_16-4343516.0 ppb
2016-12-1437729_16-4343649.0 ppb
2017-03-0837729_17-0774818.0 ppb
2017-03-0837729_17-0774516.0 ppb
2017-03-0837729_17-0774618.0 ppb
2017-03-0837729_17-0774717.0 ppb
2017-06-1437729_17-2012619.0 ppb
2017-06-1437729_17-2012718.0 ppb
2017-06-1437729_17-2012817.0 ppb
2017-06-1437729_17-2012913.0 ppb
2017-09-1337729_17-3344318.0 ppb
2017-09-1337729_17-3344217.0 ppb
2017-09-1337729_17-334407.00 ppb
2017-09-1337729_17-3344518.0 ppb
2017-12-1337729_17-4725521.0 ppb
2017-12-1337729_17-4726221.0 ppb
2017-12-1337729_17-4726318.0 ppb
2017-12-1337729_17-4726420.0 ppb
2018-01-2437729_18-02986 21.0 ppb
2018-01-2437729_18-02985 21.0 ppb
2018-01-2437729_18-02984 21.0 ppb
2018-01-2437729_18-02978 21.0 ppb
2018-06-1337729_18-23813 82.0 ppb
2018-06-1337729_18-23810 86.0 ppb
2018-06-1337729_18-23811 90.0 ppb
2018-06-1337729_18-23812 76.0 ppb
2018-09-2637729_18-39767 ND
2018-09-2637729_18-39766 36.0 ppb
2018-09-2637729_18-39765 34.0 ppb
2018-09-2637729_18-39763 30.0 ppb
2018-12-1237729_18-51797 22.0 ppb
2018-12-1237729_18-51800 19.0 ppb
2018-12-1237729_18-51801 20.0 ppb
2018-12-1237729_18-51802 21.0 ppb
2019-03-1337729_19-10461 16.0 ppb
2019-03-1337729_19-10463 15.0 ppb
2019-03-1337729_19-10464 13.0 ppb
2019-03-1337729_19-10465 15.0 ppb
2019-06-1237729_19-24140 20.0 ppb
2019-06-1237729_19-24143 10.00 ppb
2019-06-1237729_19-24142 11.0 ppb
2019-06-1237729_19-24141 13.0 ppb
2019-09-1837729_19-40518 22.0 ppb
2019-09-1837729_19-40520 19.0 ppb
2019-09-1837729_19-40519 22.0 ppb
2019-09-1837729_19-40517 24.0 ppb
2019-12-1137729_19-52844 14.0 ppb
2019-12-1137729_19-52843 15.0 ppb
2019-12-1137729_19-52842 12.0 ppb
2019-12-1137729_19-52841 15.0 ppb