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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Wright-Patterson AFB Area A PWS

Chloroform, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Chloroform and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Read More.

In addition to tap water disinfection, chloroform pollution in the environment also comes from industrial discharges from pulp and paper mills, and from urban wastewater effluent. Human studies show that chloroform damages the kidneys, liver and central nervous system. In animals, chloroform causes infertility, birth defects and cancer.

Click here to read more about disinfection byproducts.

MORE ABOUT THIS CONTAMINANT

 

195

Samples

0

Samples exceeding legal limit (MCL)

125

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20141.66 ppb2215ND - 13.4 ppb
20151.59 ppb3222ND - 8.85 ppb
20161.80 ppb3720ND - 14.2 ppb
20171.92 ppb4023ND - 13.2 ppb
20183.30 ppb4227ND - 28.2 ppb
20194.67 ppb2218ND - 30.3 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.4 ppb

The EWG Health Guideline of 0.4 ppb for chloroform was proposed in 2018 by the California Office of Environmental Health Hazard Assessment as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.

ppb = parts per billion

All test results

Date Lab ID Result
2014-01-0914A0388-01ND
2014-01-0914A0388-020.680 ppb
2014-01-0914A0388-033.38 ppb
2014-01-0914A0388-040.520 ppb
2014-02-1314B0607-010.800 ppb
2014-02-1314B0607-020.800 ppb
2014-02-1314B0607-03ND
2014-02-1314B0607-04ND
2014-02-1314B0607-051.13 ppb
2014-02-1314B0607-061.15 ppb
2014-02-1314B0607-07ND
2014-02-1314B0607-08ND
2014-04-0814D0410-010.510 ppb
2014-04-0814D0410-021.04 ppb
2014-04-0814D0410-0313.4 ppb
2014-04-0814D0410-04ND
2014-04-1414D0736-010.510 ppb
2014-04-1414D0736-026.35 ppb
2014-04-1414D0736-03ND
2014-04-1414D0736-041.28 ppb
2014-07-0914G0607-013.23 ppb
2014-07-0914G0607-021.86 ppb
2015-03-1215C0761-010.970 ppb
2015-03-1215C0761-020.950 ppb
2015-03-1215C0761-030.770 ppb
2015-03-1215C0761-04ND
2015-03-1215C0761-053.85 ppb
2015-03-1215C0761-061.15 ppb
2015-03-1215C0761-07ND
2015-03-1215C0761-08ND
2015-05-0415E0182-010.690 ppb
2015-05-0415E0182-028.85 ppb
2015-05-0415E0182-03ND
2015-05-0415E0182-042.44 ppb
2015-05-2915E1693-054.86 ppb
2015-05-2915E1693-064.89 ppb
2015-08-2515H1332-012.53 ppb
2015-08-2515H1332-022.06 ppb
2015-08-2815H1588-010.970 ppb
2015-08-2815H1588-020.980 ppb
2015-08-2815H1588-030.860 ppb
2015-08-2815H1588-04ND
2015-08-2815H1588-052.79 ppb
2015-08-2815H1588-063.39 ppb
2015-08-2815H1588-07ND
2015-08-2815H1588-08ND
2015-10-2115J1242-010.910 ppb
2015-10-2115J1242-020.990 ppb
2015-10-2115J1242-030.810 ppb
2015-10-2115J1242-04ND
2015-10-2115J1242-052.65 ppb
2015-10-2115J1242-062.64 ppb
2015-10-2115J1242-07ND
2015-10-2115J1242-08ND
2016-02-1916B0982-011.000 ppb
2016-02-1916B0982-021.04 ppb
2016-02-1916B0982-03ND
2016-02-1916B0982-04ND
2016-02-1916B0982-051.75 ppb
2016-02-1916B0982-063.52 ppb
2016-02-1916B0982-07ND
2016-02-1916B0982-08ND
2016-04-1516D0969-010.570 ppb
2016-04-1516D0969-020.610 ppb
2016-04-1516D0969-03ND
2016-04-1516D0969-04ND
2016-04-1516D0969-052.45 ppb
2016-04-1516D0969-061.95 ppb
2016-04-1516D0969-07ND
2016-04-1516D0969-08ND
2016-04-2016D1332-01ND
2016-04-2016D1332-027.82 ppb
2016-04-2016D1332-03ND
2016-04-2016D1332-044.12 ppb
2016-04-2016D1332-01ND
2016-04-2016D1332-027.82 ppb
2016-04-2016D1332-03ND
2016-04-2016D1332-044.12 ppb
2016-07-1316G1121-055.69 ppb
2016-07-1316G1121-071.29 ppb
2016-08-0316H0438-011.65 ppb
2016-08-0316H0438-021.53 ppb
2016-08-0316H0438-03ND
2016-08-0316H0438-04ND
2016-10-2116J1337-011.63 ppb
2016-10-2116J1337-021.58 ppb
2016-10-2116J1337-03ND
2016-10-2116J1337-04ND
2016-12-0616L0488-0114.2 ppb
2016-12-0616L0488-02ND
2016-12-0616L0488-032.37 ppb
2017-01-1917A0998-04ND
2017-01-1917A0998-051.38 ppb
2017-01-1917A0998-0311.7 ppb
2017-01-2417A1170-01ND
2017-01-2417A1170-021.82 ppb
2017-01-2417A1170-03ND
2017-01-2417A1170-041.87 ppb
2017-04-1117D0725-01ND
2017-04-1117D0725-021.86 ppb
2017-04-1117D0725-035.21 ppb
2017-05-0317E0251-011.89 ppb
2017-05-0317E0251-021.96 ppb
2017-05-0317E0251-03ND
2017-05-0317E0251-04ND
2017-06-1917F1272-01ND
2017-06-1917F1272-020.780 ppb
2017-06-1917F1272-03ND
2017-06-1917F1272-04ND
2017-06-1917F1272-06ND
2017-07-1917G1085-01ND
2017-07-1917G1066-010.630 ppb
2017-07-1917G1082-015.63 ppb
2017-07-1917G1084-017.46 ppb
2017-07-2017G1212-012.71 ppb
2017-07-2017G1212-022.73 ppb
2017-07-2017G1212-03ND
2017-07-2017G1212-04ND
2017-07-2017G1208-012.62 ppb
2017-07-2017G1208-020.810 ppb
2017-08-0917H0675-010.860 ppb
2017-10-0617J0438-01ND
2017-10-0617J0442-010.640 ppb
2017-10-0617J0447-015.69 ppb
2017-10-0617J0441-0113.2 ppb
2017-10-2717K0105-010.750 ppb
2017-10-2717K0105-02ND
2017-10-2717K0107-012.56 ppb
2017-10-2717K0107-022.13 ppb
2017-10-2717K0107-03ND
2017-10-2717K0107-04ND
2018-01-1918A1100-01ND
2018-01-1918A1098-010.580 ppb
2018-01-1918A1097-011.80 ppb
2018-01-1918A1099-0112.2 ppb
2018-01-2618A1527-010.840 ppb
2018-01-2618A1527-02ND
2018-01-2618A1525-011.81 ppb
2018-01-2618A1525-02ND
2018-01-2618A1525-031.82 ppb
2018-01-2618A1525-04ND
2018-04-2018D1434-01ND
2018-04-2018D1428-01ND
2018-04-2018D1430-012.15 ppb
2018-04-2018D1431-0112.6 ppb
2018-04-2318D1476-01ND
2018-04-2318D1476-020.610 ppb
2018-04-2318D1480-01ND
2018-04-2318D1480-024.47 ppb
2018-04-2318D1480-03ND
2018-04-2318D1480-044.26 ppb
2018-07-1918G1378-01ND
2018-07-1918G1379-010.790 ppb
2018-07-1918G1381-0116.4 ppb
2018-07-1918G1382-0113.1 ppb
2018-07-2318G1593-010.710 ppb
2018-07-2318G1593-02ND
2018-07-2318G1592-013.99 ppb
2018-07-2318G1592-025.11 ppb
2018-07-2318G1592-03ND
2018-07-2318G1592-04ND
2018-07-2418G1590-011.38 ppb
2018-07-2418G1590-038.46 ppb
2018-10-1718J1240-010.630 ppb
2018-10-1718J1244-010.550 ppb
2018-10-1718J1246-019.43 ppb
2018-10-1718J1242-0128.2 ppb
2018-10-2318J1673-010.980 ppb
2018-10-2318J1673-020.610 ppb
2018-10-2318J1671-012.66 ppb
2018-10-2318J1671-022.64 ppb
2018-10-2318J1671-03ND
2018-10-2318J1671-04ND
2019-07-0352176850012.60 ppb
2019-07-0352176850050.560 ppb
2019-07-0352176850060.780 ppb
2019-07-035217685002ND
2019-07-0352176850036.30 ppb
2019-07-03521768500417.8 ppb
2019-07-0852178580013.80 ppb
2019-07-0852178580022.70 ppb
2019-08-0752201960014.50 ppb
2019-08-0752201960024.20 ppb
2019-08-075220196003ND
2019-08-075220196004ND
2019-10-0252245230011.60 ppb
2019-10-0252245230021.70 ppb
2019-10-025224523003ND
2019-10-0252245230046.30 ppb
2019-10-0252245230056.10 ppb
2019-10-0352248390011.40 ppb
2019-10-0352248400010.750 ppb
2019-10-0352248400021.30 ppb
2019-10-03522484100110.00 ppb
2019-10-03522483800130.3 ppb