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EWG's Tap Water Database — 2019 UPDATE

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Chloroform

City of Gilroy

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.

 

233

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND410ND
2013ND340ND
2014ND330ND
2015ND480ND
2016ND390ND
2017ND380ND

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
2012-01-185810-001-0940ND
2012-01-185810-002-0840ND
2012-01-185806-007-1015ND
2012-02-225810-001-0810ND
2012-02-225810-002-0745ND
2012-03-135810-001-0824ND
2012-03-135810-002-0815ND
2012-04-115810-001-0845ND
2012-04-115810-002-0832ND
2012-04-115810-004-0817ND
2012-04-115810-006-1125ND
2012-04-115810-007-0940ND
2012-04-115810-008-1005ND
2012-04-115810-009-1010ND
2012-04-115810-010-0857ND
2012-04-115810-011-0800ND
2012-05-215810-001-0850ND
2012-05-215810-002-1135ND
2012-05-215810-004-1045ND
2012-05-215810-006-1315ND
2012-05-225810-007-0745ND
2012-05-225810-008-0955ND
2012-05-225810-009-1035ND
2012-05-225810-010-1115ND
2012-05-225810-011-0835ND
2012-06-135810-001-0757ND
2012-06-135810-002-0810ND
2012-07-235810-001-0747ND
2012-07-235810-002-0806ND
2012-07-235810-007-1013ND
2012-08-235810-001-1115ND
2012-08-235810-002-1100ND
2012-09-195810-001-1015ND
2012-09-195810-002-1000ND
2012-10-105810-001-1025ND
2012-10-105810-002-1045ND
2012-10-105810-007-0918ND
2012-11-205810-001-0815ND
2012-11-205810-002-0835ND
2012-12-125810-001-0750ND
2012-12-125810-002-0802ND
2013-01-165810-001-0955ND
2013-01-165810-002-0940ND
2013-01-165810-007-1028ND
2013-02-145810-001-0835ND
2013-02-145810-002-0801ND
2013-03-135810-001-0810ND
2013-03-135810-002-0755ND
2013-04-175810-001-1045ND
2013-04-175810-002-1100ND
2013-04-175810-004-1130ND
2013-04-175810-006-0935ND
2013-04-175810-007-1000ND
2013-04-175810-008-0740ND
2013-04-175810-009-0740ND
2013-04-175810-010-1030ND
2013-04-175810-011-0830ND
2013-05-155810-001-0800ND
2013-05-155810-002-0830ND
2013-06-135810-001-0748ND
2013-06-135810-002-0815ND
2013-07-225810-001-0820ND
2013-07-225810-002-0830ND
2013-07-225810-007-0930ND
2013-08-215810-001-0815ND
2013-08-215810-002-0807ND
2013-09-165810-001-0750ND
2013-09-165810-002-0805ND
2013-10-095810-001-0943ND
2013-10-095810-002-0928ND
2013-10-095810-007-1010ND
2013-11-145810-001-0815ND
2013-11-145810-002-0820ND
2013-12-125810-001-0758ND
2013-12-125810-002-0749ND
2014-01-155810-001-0925ND
2014-01-155810-002-0947ND
2014-01-155810-007-0835ND
2014-02-125810-001-0822ND
2014-02-125810-002-0853ND
2014-03-205810-001-0813ND
2014-03-205810-002-0800ND
2014-04-235810-001-0900ND
2014-04-235810-002-0749ND
2014-04-235810-004-0945ND
2014-04-235810-006-1058ND
2014-04-235810-007-1039ND
2014-04-235810-008-0819ND
2014-04-235810-010-0913ND
2014-04-235810-011-0847ND
2014-05-215810-001-0750ND
2014-05-215810-002-0800ND
2014-06-125810-001-0747ND
2014-06-125810-002-0756ND
2014-07-175810-001-0946ND
2014-07-175810-002-0802ND
2014-07-175810-007-1011ND
2014-08-285810-001-1121ND
2014-08-285810-002-1130ND
2014-09-175810-001-0801ND
2014-09-175810-002-0822ND
2014-10-155810-001-0759ND
2014-10-155810-002-1050ND
2014-10-155810-007-0836ND
2014-11-195810-002-0748ND
2014-11-245810-001-1040ND
2014-12-225810-001-0930ND
2014-12-225810-002-1000ND
2015-01-215810-001-0822ND
2015-01-215810-002-0845ND
2015-01-215810-007-0925ND
2015-02-115810-001-0815ND
2015-02-115810-002-0755ND
2015-03-105810-001-0740ND
2015-03-105810-002-0751ND
2015-04-225810-001-0915ND
2015-04-225810-002-0944ND
2015-04-225810-004-1305ND
2015-04-225810-006-0845ND
2015-04-225810-007-1142ND
2015-04-225810-008-1215ND
2015-04-225810-009-1239ND
2015-04-225810-010-1110ND
2015-04-225810-011-1040ND
2015-05-205810-006-0945ND
2015-05-205810-007-1300ND
2015-05-205810-008-1025ND
2015-05-205810-009-1100ND
2015-05-205810-010-0810ND
2015-05-215810-001-0800ND
2015-05-215810-002-1010ND
2015-05-215810-004-1250ND
2015-05-215810-011-0955ND
2015-06-225810-001-0800ND
2015-06-225810-002-0820ND
2015-07-205810-001-0812ND
2015-07-205810-002-0830ND
2015-07-205810-007-1022ND
2015-08-195810-001-0802ND
2015-08-195810-001-1225ND
2015-08-195810-002-0817ND
2015-08-195810-002-1250ND
2015-08-195810-004-1320ND
2015-08-195810-006-0948ND
2015-08-195810-007-1120ND
2015-08-195810-008-1019ND
2015-08-195810-009-1044ND
2015-08-195810-010-1203ND
2015-08-205810-011-0845ND
2015-09-295810-001-0852ND
2015-09-295810-002-0840ND
2015-10-145810-001-1040ND
2015-11-185810-001-0840ND
2015-11-185810-002-0925ND
2015-12-145810-001-0840ND
2015-12-145810-002-0821ND
2016-01-205810-001-0940ND
2016-01-205810-002-0832ND
2016-01-205810-900-1015ND
2016-01-205810-901-1035ND
2016-02-105810-001-0830ND
2016-02-105810-002-0820ND
2016-03-165810-001-1030ND
2016-03-165810-002-1050ND
2016-04-255810-001-0832ND
2016-04-255810-002-1055ND
2016-04-255810-004-0855ND
2016-04-255810-006-0905ND
2016-04-255810-008-0950ND
2016-04-255810-009-0940ND
2016-04-255810-010-1041ND
2016-04-255810-011-1005ND
2016-04-255810-900-1120ND
2016-04-255810-901-1110ND
2016-05-185810-001-0905ND
2016-05-185810-002-0858ND
2016-06-165810-001-0820ND
2016-06-165810-002-0840ND
2016-07-205810-001-0915ND
2016-07-205810-002-0945ND
2016-07-205810-006-1019ND
2016-07-205810-900-1127ND
2016-07-205810-901-1109ND
2016-08-045810-001-1125ND
2016-08-045810-002-1140ND
2016-09-225810-001-0756ND
2016-09-225810-002-0816ND
2016-10-135810-001-0750ND
2016-10-135810-002-0820ND
2016-10-135810-900-0110ND
2016-10-135810-901-1130ND
2016-11-095810-001-0830ND
2016-11-095810-002-0850ND
2016-12-155810-001-0835ND
2016-12-155810-002-0850ND
2017-01-185810-001-0855ND
2017-01-185810-002-0835ND
2017-01-185810-900-1030ND
2017-01-185810-901-1010ND
2017-02-155810-001-0755ND
2017-02-155810-002-0815ND
2017-03-155810-001-0810ND
2017-03-155810-002-0830ND
2017-04-135810-001-0935ND
2017-04-135810-002-0830ND
2017-04-135810-006-0915ND
2017-04-135810-008-1025ND
2017-04-135810-009-1035ND
2017-04-135810-010-1015ND
2017-04-135810-011-0800ND
2017-04-135810-900-1135ND
2017-04-135810-901-1115ND
2017-05-155810-001-1140ND
2017-05-155810-002-1120ND
2017-06-135810-001-0740ND
2017-06-135810-002-0800ND
2017-06-135810-004-0817ND
2017-06-135810-007-0945ND
2017-07-175810-001-1130ND
2017-07-175810-002-1250ND
2017-07-175810-007-1050ND
2017-07-175810-900-1335ND
2017-07-175810-901-1311ND
2017-08-245810-001-0740ND
2017-08-245810-002-0758ND
2017-09-185810-001-0822ND
2017-09-185810-002-0810ND
2017-10-055810-001-0805ND
2017-10-055810-007-0845ND
2017-10-055810-900-1120ND
2017-10-055810-901-1105ND
2017-11-205810-001-1300ND
2017-12-145810-001-0845ND