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EWG's Tap Water Database — 2021 UPDATE

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Haloacetic acids (HAA5)

City of Wilson

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

9

Samples exceeding legal limit (MCL)

192

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
201436.1 ppb323214.0 ppb - 58.0 ppb
201548.3 ppb323224.0 ppb - 78.0 ppb
201641.8 ppb323217.0 ppb - 73.0 ppb
201739.6 ppb323227.0 ppb - 55.0 ppb
201840.3 ppb323212.0 ppb - 70.0 ppb
201926.3 ppb323215.0 ppb - 40.0 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
2014-01-2837729_14-0299620.0 ppb
2014-01-2837729_14-0299717.0 ppb
2014-01-2837729_14-0299820.0 ppb
2014-01-2837729_14-0299918.0 ppb
2014-01-2837729_14-0300014.0 ppb
2014-01-2837729_14-0300127.0 ppb
2014-01-2837729_14-0300219.0 ppb
2014-01-2837729_14-0300318.0 ppb
2014-04-1637729_14-1095945.0 ppb
2014-04-1637729_14-1096051.0 ppb
2014-04-1637729_14-1096135.0 ppb
2014-04-1637729_14-1096238.0 ppb
2014-04-1637729_14-1096351.0 ppb
2014-04-1637729_14-1096424.0 ppb
2014-04-1637729_14-1096523.0 ppb
2014-04-1637729_14-1096637.0 ppb
2014-07-2337729_14-2201658.0 ppb
2014-07-2337729_14-2201753.0 ppb
2014-07-2337729_14-2201834.0 ppb
2014-07-2337729_14-2201953.0 ppb
2014-07-2337729_14-2202052.0 ppb
2014-07-2337729_14-2202138.0 ppb
2014-07-2337729_14-2202245.0 ppb
2014-07-2337729_14-2202349.0 ppb
2014-10-1437729_14-3145553.0 ppb
2014-10-1437729_14-3145647.0 ppb
2014-10-1437729_14-3145728.0 ppb
2014-10-1437729_14-3145835.0 ppb
2014-10-1437729_14-3145941.0 ppb
2014-10-1437729_14-3146042.0 ppb
2014-10-1437729_14-3146125.0 ppb
2014-10-1437729_14-3146245.0 ppb
2015-01-1337.0 ppb
2015-01-1338.0 ppb
2015-01-1340.0 ppb
2015-01-1328.0 ppb
2015-01-1324.0 ppb
2015-01-1339.0 ppb
2015-01-1331.0 ppb
2015-01-1333.0 ppb
2015-04-1450.0 ppb
2015-04-1455.0 ppb
2015-04-1454.0 ppb
2015-04-1449.0 ppb
2015-04-1444.0 ppb
2015-04-1451.0 ppb
2015-04-1450.0 ppb
2015-04-1451.0 ppb
2015-07-1450.0 ppb
2015-07-1451.0 ppb
2015-07-1444.0 ppb
2015-07-1445.0 ppb
2015-07-1439.0 ppb
2015-07-1444.0 ppb
2015-07-1443.0 ppb
2015-07-1447.0 ppb
2015-10-1364.0 ppb
2015-10-1360.0 ppb
2015-10-1353.0 ppb
2015-10-1359.0 ppb
2015-10-1352.0 ppb
2015-10-1371.0 ppb
2015-10-1378.0 ppb
2015-10-1370.0 ppb
2016-01-1237729_16-0139432.0 ppb
2016-01-1237729_16-0139524.0 ppb
2016-01-1237729_16-0139617.0 ppb
2016-01-1237729_16-0139721.0 ppb
2016-01-1237729_16-0139825.0 ppb
2016-01-1237729_16-0139925.0 ppb
2016-01-1237729_16-0140026.0 ppb
2016-01-1237729_16-0140126.0 ppb
2016-04-1337729_16-1173035.0 ppb
2016-04-1337729_16-1173137.0 ppb
2016-04-1337729_16-1173239.0 ppb
2016-04-1337729_16-1173338.0 ppb
2016-04-1337729_16-1173428.0 ppb
2016-04-1337729_16-1173537.0 ppb
2016-04-1337729_16-1173634.0 ppb
2016-04-1337729_16-1173743.0 ppb
2016-07-1237729_16-2311659.0 ppb
2016-07-1237729_16-2311760.0 ppb
2016-07-1237729_16-2312041.0 ppb
2016-07-1237729_16-2312152.0 ppb
2016-07-1237729_16-2312348.0 ppb
2016-07-1237729_16-2312948.0 ppb
2016-07-1237729_16-2313053.0 ppb
2016-07-1237729_16-2313160.0 ppb
2016-10-0637729_16-3514552.0 ppb
2016-10-0637729_16-3514673.0 ppb
2016-10-0637729_16-3514749.0 ppb
2016-10-0637729_16-3514853.0 ppb
2016-10-0637729_16-3514951.0 ppb
2016-10-0637729_16-3515035.0 ppb
2016-10-0637729_16-3515154.0 ppb
2016-10-0637729_16-3515261.0 ppb
2017-01-1137729_17-0141532.0 ppb
2017-01-1137729_17-0141630.0 ppb
2017-01-1137729_17-0141734.0 ppb
2017-01-1137729_17-0141831.0 ppb
2017-01-1137729_17-0141927.0 ppb
2017-01-1137729_17-0142140.0 ppb
2017-01-1137729_17-0142232.0 ppb
2017-01-1137729_17-0142330.0 ppb
2017-04-1137729_17-1235748.0 ppb
2017-04-1137729_17-1235838.0 ppb
2017-04-1137729_17-1235939.0 ppb
2017-04-1137729_17-1236032.0 ppb
2017-04-1137729_17-1236139.0 ppb
2017-04-1137729_17-1236244.0 ppb
2017-04-1137729_17-1236341.0 ppb
2017-04-1137729_17-1236443.0 ppb
2017-07-1137729_17-2402142.0 ppb
2017-07-1137729_17-2402239.0 ppb
2017-07-1137729_17-2402330.0 ppb
2017-07-1137729_17-2402438.0 ppb
2017-07-1137729_17-2402548.0 ppb
2017-07-1137729_17-2402650.0 ppb
2017-07-1137729_17-2402754.0 ppb
2017-07-1137729_17-2402850.0 ppb
2017-10-1037729_17-3831233.0 ppb
2017-10-1037729_17-3831336.0 ppb
2017-10-1037729_17-3831432.0 ppb
2017-10-1037729_17-3831532.0 ppb
2017-10-1037729_17-3831642.0 ppb
2017-10-1037729_17-3831754.0 ppb
2017-10-1037729_17-3831855.0 ppb
2017-10-1037729_17-3831952.0 ppb
2018-01-1037729_18-01403 33.0 ppb
2018-01-1037729_18-01404 25.0 ppb
2018-01-1037729_18-01405 19.0 ppb
2018-01-1037729_18-01406 15.0 ppb
2018-01-1037729_18-01407 16.0 ppb
2018-01-1037729_18-01408 14.0 ppb
2018-01-1037729_18-01409 12.0 ppb
2018-01-1037729_18-01410 15.0 ppb
2018-04-1037729_18-14234 35.0 ppb
2018-04-1037729_18-14235 42.0 ppb
2018-04-1037729_18-14236 38.0 ppb
2018-04-1037729_18-14237 43.0 ppb
2018-04-1037729_18-14238 29.0 ppb
2018-04-1037729_18-14239 54.0 ppb
2018-04-1037729_18-14240 35.0 ppb
2018-04-1037729_18-14241 36.0 ppb
2018-07-1037729_18-28401 54.0 ppb
2018-07-1037729_18-28404 57.0 ppb
2018-07-1037729_18-28405 25.0 ppb
2018-07-1037729_18-28406 56.0 ppb
2018-07-1037729_18-28407 49.0 ppb
2018-07-1037729_18-28408 70.0 ppb
2018-07-1037729_18-28409 49.0 ppb
2018-07-1037729_18-28410 50.0 ppb
2018-10-1637729_18-43345 44.0 ppb
2018-10-1637729_18-43346 48.0 ppb
2018-10-1637729_18-43347 62.0 ppb
2018-10-1637729_18-43348 48.0 ppb
2018-10-1637729_18-43349 59.0 ppb
2018-10-1637729_18-43350 59.0 ppb
2018-10-1637729_18-43351 63.0 ppb
2018-10-1637729_18-43352 35.0 ppb
2019-01-1537729_19-02481 25.0 ppb
2019-01-1537729_19-02482 20.0 ppb
2019-01-1537729_19-02483 20.0 ppb
2019-01-1537729_19-02484 20.0 ppb
2019-01-1537729_19-02485 30.0 ppb
2019-01-1537729_19-02486 15.0 ppb
2019-01-1537729_19-02487 20.0 ppb
2019-01-1537729_19-02488 32.0 ppb
2019-04-0937729_19-14871 30.0 ppb
2019-04-0937729_19-14872 30.0 ppb
2019-04-0937729_19-14873 27.0 ppb
2019-04-0937729_19-14874 28.0 ppb
2019-04-0937729_19-14875 30.0 ppb
2019-04-0937729_19-14876 25.0 ppb
2019-04-0937729_19-14877 30.0 ppb
2019-04-0937729_19-14878 24.0 ppb
2019-07-0937729_19-28891 21.0 ppb
2019-07-0937729_19-28892 40.0 ppb
2019-07-0937729_19-28893 21.0 ppb
2019-07-0937729_19-28894 29.0 ppb
2019-07-0937729_19-28895 32.0 ppb
2019-07-0937729_19-28896 22.0 ppb
2019-07-0937729_19-28897 22.0 ppb
2019-07-0937729_19-28898 30.0 ppb
2019-10-0837729_19-43915 24.0 ppb
2019-10-0837729_19-43916 28.0 ppb
2019-10-0837729_19-43917 35.0 ppb
2019-10-0837729_19-43918 30.0 ppb
2019-10-0837729_19-43919 19.0 ppb
2019-10-0837729_19-43920 27.0 ppb
2019-10-0837729_19-43921 29.0 ppb
2019-10-0837729_19-43922 27.0 ppb