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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

City of Fountain Valley

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

 

245

Samples

0

Samples exceeding legal limit (MCL)

69

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20141.82 ppb4610ND - 18.6 ppb
20153.71 ppb4115ND - 18.1 ppb
20161.22 ppb3910ND - 12.8 ppb
20172.34 ppb4626ND - 18.1 ppb
20181.12 ppb338ND - 6.40 ppb
2019ND400ND

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
2014-01-144417-006-0800ND
2014-01-154417-008-0800ND
2014-01-284417-009-0735ND
2014-01-294417-011-0740ND
2014-01-304417-010-0715ND
2014-03-173761-801-12229.30 ppb
2014-03-173761-802-14495.70 ppb
2014-03-173761-803-15094.60 ppb
2014-03-173761-804-15185.50 ppb
2014-03-173761-805-120210.5 ppb
2014-03-173761-806-11498.70 ppb
2014-03-173761-807-113210.1 ppb
2014-03-173761-808-12109.80 ppb
2014-04-074417-006-0800ND
2014-04-074417-008-0840ND
2014-04-084417-010-0825ND
2014-04-084417-020-0800ND
2014-04-094417-009-0745ND
2014-04-094417-011-0815ND
2014-06-293761-801-1109ND
2014-06-293761-802-1116ND
2014-06-293761-803-1129ND
2014-06-293761-804-1137ND
2014-06-293761-805-1101ND
2014-06-293761-806-1043ND
2014-06-293761-807-1035ND
2014-06-293761-808-10501.10 ppb
2014-07-174417-010-0810ND
2014-09-083761-801-1241ND
2014-09-083761-802-1425ND
2014-09-083761-803-1432ND
2014-09-083761-804-1440ND
2014-09-083761-805-1232ND
2014-09-083761-806-1158ND
2014-09-083761-807-1149ND
2014-09-083761-808-1206ND
2014-10-204417-009-0840ND
2014-11-254417-010-0755ND
2014-12-223761-801-1105ND
2014-12-223761-802-1300ND
2014-12-223761-803-1310ND
2014-12-223761-804-1315ND
2014-12-223761-805-1045ND
2014-12-223761-806-1025ND
2014-12-223761-807-1015ND
2014-12-223761-808-130018.6 ppb
2015-01-124417-009-0840ND
2015-01-124417-020-0800ND
2015-01-144417-010-0835ND
2015-03-093761-801-0950ND
2015-03-093761-802-1225ND
2015-03-093761-803-1240ND
2015-03-093761-804-1255ND
2015-03-093761-805-0930ND
2015-03-093761-806-0900ND
2015-03-093761-807-0850ND
2015-03-093761-808-121015.5 ppb
2015-04-074417-006-0830ND
2015-04-074417-008-0915ND
2015-04-154417-011-0750ND
2015-04-154417-020-0830ND
2015-05-284417-009-0735ND
2015-06-013761-801-1035ND
2015-06-013761-802-1240ND
2015-06-013761-803-1250ND
2015-06-013761-804-1300ND
2015-06-013761-805-1015ND
2015-06-013761-806-0950ND
2015-06-013761-807-0940ND
2015-06-013761-808-14156.00 ppb
2015-07-134417-006-0820ND
2015-09-073761-801-063015.0 ppb
2015-09-073761-802-083015.5 ppb
2015-09-073761-803-084014.6 ppb
2015-09-073761-804-085017.7 ppb
2015-09-073761-805-061011.9 ppb
2015-09-073761-806-0550ND
2015-09-073761-807-0540ND
2015-09-073761-808-100018.1 ppb
2015-12-073761-801-07505.60 ppb
2015-12-073761-802-10006.70 ppb
2015-12-073761-803-10153.60 ppb
2015-12-073761-804-10304.10 ppb
2015-12-073761-805-0725ND
2015-12-073761-806-07006.10 ppb
2015-12-073761-807-06454.70 ppb
2015-12-073761-808-11457.20 ppb
2016-01-134417-010-0750ND
2016-03-073761-801-09353.10 ppb
2016-03-073761-802-11503.00 ppb
2016-03-073761-803-12003.20 ppb
2016-03-073761-804-12103.20 ppb
2016-03-073761-805-09153.10 ppb
2016-03-073761-806-0855ND
2016-03-073761-807-0845ND
2016-03-073761-808-11403.20 ppb
2016-04-054417-009-0735ND
2016-04-064417-008-0810ND
2016-04-064417-020-0745ND
2016-04-074417-006-0850ND
2016-04-074417-011-0755ND
2016-06-063761-801-1130ND
2016-06-063761-802-1330ND
2016-06-063761-803-1340ND
2016-06-063761-804-1350ND
2016-06-063761-805-1110ND
2016-06-063761-806-1050ND
2016-06-063761-807-1040ND
2016-06-063761-808-15004.80 ppb
2016-07-124417-006-0820ND
2016-09-053761-801-0730ND
2016-09-053761-802-0930ND
2016-09-053761-803-0940ND
2016-09-053761-804-0950ND
2016-09-053761-805-0710ND
2016-09-053761-806-0650ND
2016-09-053761-807-0640ND
2016-09-053761-808-110012.8 ppb
2016-12-053761-801-1030ND
2016-12-053761-802-1230ND
2016-12-053761-803-1240ND
2016-12-053761-804-1250ND
2016-12-053761-805-1010ND
2016-12-053761-806-0950ND
2016-12-053761-807-09401.000 ppb
2016-12-053761-808-140010.00 ppb
2017-01-124417-010-0940ND
2017-02-273761-801-1030ND
2017-02-273761-802-1230ND
2017-02-273761-803-1240ND
2017-02-273761-804-1250ND
2017-02-273761-805-1010ND
2017-02-273761-806-0950ND
2017-02-273761-807-0940ND
2017-02-273761-808-140018.1 ppb
2017-04-104417-020-0805ND
2017-04-184417-008-0800ND
2017-04-184417-011-0825ND
2017-06-053761-801-1030ND
2017-06-053761-802-1230ND
2017-06-053761-803-1240ND
2017-06-053761-804-1250ND
2017-06-053761-805-1010ND
2017-06-053761-806-0950ND
2017-06-053761-807-0940ND
2017-06-053761-808-14001.80 ppb
2017-06-154417-006-0845ND
2017-09-043761-801-08301.80 ppb
2017-09-043761-802-10302.00 ppb
2017-09-043761-803-10402.00 ppb
2017-09-043761-804-10502.30 ppb
2017-09-043761-805-08101.80 ppb
2017-09-043761-806-07501.70 ppb
2017-09-043761-807-07401.70 ppb
2017-09-043761-808-12001.80 ppb
2017-10-034417-006-0820ND
2017-12-043761-801-10403.70 ppb
2017-12-043761-802-12402.80 ppb
2017-12-043761-803-12502.80 ppb
2017-12-043761-804-13002.90 ppb
2017-12-043761-805-10203.00 ppb
2017-12-043761-806-10003.00 ppb
2017-12-043761-807-09502.90 ppb
2017-12-043761-808-10353.00 ppb
2017-12-153761-801-11484.10 ppb
2017-12-153761-802-11576.50 ppb
2017-12-153761-803-12053.80 ppb
2017-12-153761-804-12134.10 ppb
2017-12-153761-805-11408.00 ppb
2017-12-153761-806-11227.40 ppb
2017-12-153761-807-11106.00 ppb
2017-12-153761-808-11308.70 ppb
2018-01-084417-006-0800ND
2018-01-104417-008-0720ND
2018-01-114417-010-0715ND
2018-02-264417-011-0750ND
2018-04-094417-006-0750ND
2018-04-094417-008-0830ND
2018-04-114417-020-0740ND
2018-06-113761-801-10003.80 ppb
2018-06-113761-802-12003.50 ppb
2018-06-113761-803-12102.80 ppb
2018-06-113761-804-12203.00 ppb
2018-06-113761-805-0940ND
2018-06-113761-806-0920ND
2018-06-113761-807-09106.00 ppb
2018-06-113761-808-09556.40 ppb
2018-06-204417-011-0845ND
2018-09-103761-801-1000ND
2018-09-103761-802-1200ND
2018-09-103761-803-1210ND
2018-09-103761-804-1220ND
2018-09-103761-805-0940ND
2018-09-103761-806-0920ND
2018-09-103761-807-0910ND
2018-09-103761-808-12305.20 ppb
2018-09-184417-009-0805ND
2018-12-103761-801-0950ND
2018-12-103761-802-1150ND
2018-12-103761-803-1200ND
2018-12-103761-804-1210ND
2018-12-103761-805-0930ND
2018-12-103761-806-0910ND
2018-12-103761-807-0900ND
2018-12-103761-808-09456.30 ppb
2019-01-074417-008-0830ND
2019-01-094417-006-0800ND
2019-01-174417-009-0820ND
2019-01-174417-010-0750ND
2019-02-114417-020-0850ND
2019-02-124417-011-0810ND
2019-03-113761-801-0950ND
2019-03-113761-802-1150ND
2019-03-113761-803-1200ND
2019-03-113761-804-1210ND
2019-03-113761-805-0930ND
2019-03-113761-806-0910ND
2019-03-113761-807-0900ND
2019-03-113761-808-1320ND
2019-04-024417-006-0800ND
2019-04-024417-008-0840ND
2019-06-103761-801-1030ND
2019-06-103761-802-1230ND
2019-06-103761-803-1240ND
2019-06-103761-804-1250ND
2019-06-103761-805-1010ND
2019-06-103761-806-0950ND
2019-06-103761-807-0940ND
2019-06-103761-808-1400ND
2019-09-093761-801-0930ND
2019-09-093761-802-1140ND
2019-09-093761-803-1150ND
2019-09-093761-804-1200ND
2019-09-093761-805-0920ND
2019-09-093761-806-0900ND
2019-09-093761-807-0850ND
2019-09-093761-808-1310ND
2019-12-093761-801-1210ND
2019-12-093761-802-0910ND
2019-12-093761-803-0920ND
2019-12-093761-804-0930ND
2019-12-093761-805-1150ND
2019-12-093761-806-1130ND
2019-12-093761-807-1120ND
2019-12-093761-808-1205ND