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EWG's Tap Water Database — 2021 UPDATE

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Haloacetic acids (HAA5)

City of Mebane

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

 

97

Samples

0

Samples exceeding legal limit (MCL)

97

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201428.7 ppb16164.00 ppb - 53.0 ppb
201531.7 ppb16165.00 ppb - 53.0 ppb
201618.1 ppb161610.00 ppb - 33.0 ppb
201722.7 ppb161614.1 ppb - 35.0 ppb
201825.0 ppb171715.5 ppb - 43.0 ppb
201922.5 ppb16165.10 ppb - 32.0 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
2014-02-1816039-1417.0 ppb
2014-02-1816040-1421.0 ppb
2014-02-1816041-1424.0 ppb
2014-02-1816038-1424.0 ppb
2014-05-14173101A1449.0 ppb
2014-05-14173102-1453.0 ppb
2014-05-14173103-1447.0 ppb
2014-05-14173104-1440.0 ppb
2014-08-13173628-146.00 ppb
2014-08-13173629-1450.0 ppb
2014-08-13173630-1431.0 ppb
2014-08-13173631-1415.0 ppb
2014-11-12174361-1427.0 ppb
2014-11-12174363-1426.0 ppb
2014-11-12174362-1425.0 ppb
2014-11-12174360-144.00 ppb
2015-02-1127.0 ppb
2015-02-1120.0 ppb
2015-02-1127.0 ppb
2015-02-1128.0 ppb
2015-05-1341.0 ppb
2015-05-1328.0 ppb
2015-05-1328.0 ppb
2015-05-1335.0 ppb
2015-08-1341.0 ppb
2015-08-135.00 ppb
2015-08-1333.0 ppb
2015-08-1338.0 ppb
2015-11-1011.0 ppb
2015-11-1044.0 ppb
2015-11-1053.0 ppb
2015-11-1048.0 ppb
2016-02-17237-1618.0 ppb
2016-02-17235-1611.0 ppb
2016-02-17236-1610.00 ppb
2016-02-17234-1633.0 ppb
2016-05-11344753417.2 ppb
2016-05-11344753312.7 ppb
2016-05-11344753214.2 ppb
2016-05-11344753120.5 ppb
2016-08-10351892617.4 ppb
2016-08-10351892713.3 ppb
2016-08-10351892812.4 ppb
2016-08-10351892913.4 ppb
2016-11-08358236227.0 ppb
2016-11-08358236325.0 ppb
2016-11-08358236422.0 ppb
2016-11-08358236523.0 ppb
2017-02-08363486814.1 ppb
2017-02-08363486516.7 ppb
2017-02-08363486614.9 ppb
2017-02-08363486715.7 ppb
2017-05-10369225928.0 ppb
2017-05-10369226028.0 ppb
2017-05-10369226122.0 ppb
2017-05-10369226229.0 ppb
2017-08-09375324527.0 ppb
2017-08-09375324434.0 ppb
2017-08-09375324331.0 ppb
2017-08-09375324235.0 ppb
2017-11-08381734817.4 ppb
2017-11-08381734918.1 ppb
2017-11-08381735016.4 ppb
2017-11-08381735115.6 ppb
2018-02-143872946 18.1 ppb
2018-02-143872945 15.5 ppb
2018-02-143872944 16.6 ppb
2018-02-143872943 16.7 ppb
2018-05-093933043 23.6 ppb
2018-05-093933040 32.0 ppb
2018-05-093933041 26.8 ppb
2018-05-093933042 26.2 ppb
2018-08-084016647 27.1 ppb
2018-08-084016646 30.3 ppb
2018-08-084016645 29.0 ppb
2018-08-084016644 32.0 ppb
2018-08-284039693 43.0 ppb
2018-11-144124965 20.0 ppb
2018-11-144124966 21.7 ppb
2018-11-144124967 19.2 ppb
2018-11-144124968 26.6 ppb
2019-02-134197653 20.0 ppb
2019-02-134197654 19.0 ppb
2019-02-134197655 16.9 ppb
2019-02-134197656 19.0 ppb
2019-05-084288009 30.0 ppb
2019-05-084288012 26.0 ppb
2019-05-084288011 30.0 ppb
2019-05-084288010 26.0 ppb
2019-08-144387675 27.0 ppb
2019-08-144387677 32.0 ppb
2019-08-144387676 20.0 ppb
2019-08-144387674 30.0 ppb
2019-11-064478937 20.0 ppb
2019-11-064478935 19.0 ppb
2019-11-064478933 20.0 ppb
2019-11-064478931 5.10 ppb