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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Beaumont Cherry Valley WD

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

 

132

Samples

0

Samples exceeding legal limit (MCL)

41

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.290 ppb103ND - 1.20 ppb
20150.344 ppb228ND - 2.00 ppb
20160.290 ppb279ND - 1.30 ppb
20170.398 ppb219ND - 1.40 ppb
20180.239 ppb236ND - 1.50 ppb
20190.317 ppb296ND - 2.60 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
2014-03-174790-801-1141ND
2014-03-174790-802-1119ND
2014-03-174790-803-1020ND
2014-03-174790-804-09360.940 ppb
2014-03-174790-805-1331ND
2014-12-164790-801-0946ND
2014-12-164790-802-07370.760 ppb
2014-12-164790-803-0900ND
2014-12-164790-804-08261.20 ppb
2014-12-164790-805-1006ND
2015-03-164790-801-1311ND
2015-03-164790-802-1434ND
2015-03-164790-803-1340ND
2015-03-164790-804-14101.40 ppb
2015-03-164790-805-1502ND
2015-06-184790-801-0800ND
2015-06-184790-802-08300.640 ppb
2015-06-184790-803-0927ND
2015-06-184790-804-09502.00 ppb
2015-06-184790-805-1005ND
2015-09-174790-801-1334ND
2015-09-174790-802-12150.790 ppb
2015-09-174790-803-1240ND
2015-09-174790-804-13000.690 ppb
2015-09-174790-805-1414ND
2015-12-024790-025-0850ND
2015-12-034790-025-0952ND
2015-12-144790-801-1201ND
2015-12-144790-802-0911ND
2015-12-144790-803-13220.760 ppb
2015-12-144790-804-12440.590 ppb
2015-12-144790-805-14000.690 ppb
2016-03-154790-801-1247ND
2016-03-154790-802-0941ND
2016-03-154790-803-12000.940 ppb
2016-03-154790-804-11550.990 ppb
2016-03-154790-805-1331ND
2016-06-144790-801-1233ND
2016-06-144790-802-1040ND
2016-06-144790-803-11270.930 ppb
2016-06-144790-804-11540.740 ppb
2016-06-144790-805-14140.760 ppb
2016-12-014790-005-1230ND
2016-12-014790-007-1323ND
2016-12-014790-011-0818ND
2016-12-014790-012-0926ND
2016-12-014790-013-0905ND
2016-12-014790-015-1343ND
2016-12-014790-020-0845ND
2016-12-014790-022-1017ND
2016-12-014790-023-1035ND
2016-12-014790-026-0721ND
2016-12-084790-017-0841ND
2016-12-084790-031-0750ND
2016-12-204790-801-12570.550 ppb
2016-12-204790-802-12301.30 ppb
2016-12-204790-803-11320.900 ppb
2016-12-204790-804-09360.710 ppb
2016-12-204790-805-1331ND
2017-03-224790-801-1515ND
2017-03-224790-802-13200.890 ppb
2017-03-224790-803-1345ND
2017-03-224790-804-14051.20 ppb
2017-03-224790-805-1435ND
2017-06-214790-801-0948ND
2017-06-214790-802-10480.600 ppb
2017-06-214790-803-1318ND
2017-06-214790-804-12300.930 ppb
2017-06-214790-805-1355ND
2017-09-204790-801-13130.500 ppb
2017-09-204790-802-1202ND
2017-09-204790-803-1243ND
2017-09-204790-804-12581.40 ppb
2017-09-204790-805-1326ND
2017-10-024790-006-09150.840 ppb
2017-12-194790-801-0722ND
2017-12-194790-802-0930ND
2017-12-194790-803-08050.800 ppb
2017-12-194790-804-08311.20 ppb
2017-12-194790-805-1000ND
2018-03-214790-801-1130ND
2018-03-214790-802-12100.940 ppb
2018-03-214790-803-1235ND
2018-03-214790-804-13001.50 ppb
2018-03-214790-805-13351.10 ppb
2018-06-214790-801-0950ND
2018-06-214790-802-1100ND
2018-06-214790-803-1130ND
2018-06-214790-804-10450.550 ppb
2018-06-214790-805-10200.560 ppb
2018-09-184790-801-1328ND
2018-09-184790-802-08130.840 ppb
2018-09-184790-803-1122ND
2018-09-184790-804-1008ND
2018-09-184790-805-1444ND
2018-12-134790-021-1115ND
2018-12-174790-801-0810ND
2018-12-174790-802-0920ND
2018-12-174790-803-0940ND
2018-12-174790-804-1005ND
2018-12-174790-805-0830ND
2018-12-184790-025-1038ND
2018-12-184790-031-1338ND
2019-03-194790-801-0806ND
2019-03-194790-802-0856ND
2019-03-194790-803-10131.000 ppb
2019-03-194790-804-10552.60 ppb
2019-03-194790-805-1145ND
2019-06-194790-801-0828ND
2019-06-194790-802-0955ND
2019-06-194790-803-1144ND
2019-06-194790-804-13381.30 ppb
2019-06-194790-805-1533ND
2019-09-164790-801-1250ND
2019-09-164790-802-12251.000 ppb
2019-09-164790-803-1055ND
2019-09-164790-804-1030ND
2019-09-164790-805-1155ND
2019-12-034790-007-1422ND
2019-12-034790-012-1108ND
2019-12-034790-013-0908ND
2019-12-034790-015-0933ND
2019-12-034790-020-1018ND
2019-12-044790-017-1010ND
2019-12-044790-022-1408ND
2019-12-044790-023-1158ND
2019-12-044790-026-0838ND
2019-12-184790-801-0730ND
2019-12-184790-802-11301.60 ppb
2019-12-184790-803-0820ND
2019-12-184790-804-09201.70 ppb
2019-12-184790-805-1010ND