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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

City of Tustin

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

 

278

Samples

0

Samples exceeding legal limit (MCL)

97

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20145.44 ppb4526ND - 18.0 ppb
20155.14 ppb4225ND - 17.7 ppb
20161.15 ppb4613ND - 5.90 ppb
20171.24 ppb5417ND - 8.30 ppb
20180.674 ppb477ND - 5.20 ppb
20190.464 ppb449ND - 4.00 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
2014-02-254417-008-1050ND
2014-02-254417-011-1000ND
2014-02-254417-012-1025ND
2014-02-254417-017-1115ND
2014-03-113761-801-104511.9 ppb
2014-03-113761-802-12358.10 ppb
2014-03-113761-803-1005ND
2014-03-113761-804-09056.40 ppb
2014-03-113761-805-1130ND
2014-03-113761-806-1025ND
2014-03-113761-807-09206.90 ppb
2014-03-113761-808-094510.2 ppb
2014-05-284417-011-1040ND
2014-05-284417-013-0830ND
2014-05-284417-032-0945ND
2014-06-103761-801-121013.8 ppb
2014-06-103761-802-085014.4 ppb
2014-06-103761-803-10105.00 ppb
2014-06-103761-804-11009.60 ppb
2014-06-103761-805-1035ND
2014-06-103761-806-115515.2 ppb
2014-06-103761-807-11159.20 ppb
2014-06-103761-808-113518.0 ppb
2014-08-134417-003-1015ND
2014-08-134417-011-1045ND
2014-08-134417-013-0850ND
2014-08-134417-016-1030ND
2014-09-093761-801-101014.1 ppb
2014-09-093761-802-125012.7 ppb
2014-09-093761-803-09453.50 ppb
2014-09-093761-804-084012.3 ppb
2014-09-093761-805-10401.50 ppb
2014-09-093761-806-100015.6 ppb
2014-09-093761-807-085510.4 ppb
2014-09-093761-808-093015.5 ppb
2014-11-134417-011-1130ND
2014-11-134417-013-0945ND
2014-12-023761-801-09201.30 ppb
2014-12-023761-802-11257.70 ppb
2014-12-023761-803-0735ND
2014-12-023761-804-08256.80 ppb
2014-12-023761-805-0855ND
2014-12-023761-806-09102.30 ppb
2014-12-023761-807-09408.20 ppb
2014-12-023761-808-07454.40 ppb
2015-03-103761-801-12108.80 ppb
2015-03-103761-802-13008.60 ppb
2015-03-103761-803-10002.20 ppb
2015-03-103761-804-10552.40 ppb
2015-03-103761-805-10251.10 ppb
2015-03-103761-806-12009.30 ppb
2015-03-103761-807-11102.50 ppb
2015-03-103761-808-113010.2 ppb
2015-03-114417-008-0940ND
2015-03-114417-012-1045ND
2015-03-114417-016-1015ND
2015-03-114417-017-0925ND
2015-05-134417-011-1040ND
2015-05-134417-013-0840ND
2015-05-134417-032-0955ND
2015-06-093761-801-092015.1 ppb
2015-06-093761-802-101014.8 ppb
2015-06-093761-803-08103.00 ppb
2015-06-093761-804-08552.80 ppb
2015-06-093761-805-101512.9 ppb
2015-06-093761-806-091013.3 ppb
2015-06-093761-807-09002.10 ppb
2015-06-093761-808-082012.5 ppb
2015-07-274417-009-0940ND
2015-07-274417-022-1030ND
2015-09-083761-801-110012.9 ppb
2015-09-083761-802-132014.9 ppb
2015-09-083761-803-10204.40 ppb
2015-09-083761-804-09102.80 ppb
2015-09-083761-805-113517.4 ppb
2015-09-083761-806-104515.2 ppb
2015-09-083761-807-09253.50 ppb
2015-09-083761-808-100517.7 ppb
2015-11-184417-022-1110ND
2015-12-083761-801-11055.40 ppb
2015-12-083761-802-1230ND
2015-12-083761-803-1010ND
2015-12-083761-804-0910ND
2015-12-083761-805-1030ND
2015-12-083761-806-1050ND
2015-12-083761-807-0925ND
2015-12-083761-808-0955ND
2016-02-244417-003-1110ND
2016-02-244417-008-0855ND
2016-02-244417-011-0950ND
2016-02-244417-016-0930ND
2016-02-244417-017-0840ND
2016-02-244417-022-1035ND
2016-03-083761-801-10003.70 ppb
2016-03-083761-802-1130ND
2016-03-083761-803-0900ND
2016-03-083761-804-0830ND
2016-03-083761-805-0900ND
2016-03-083761-806-09403.70 ppb
2016-03-083761-807-0840ND
2016-03-083761-808-09103.30 ppb
2016-06-024417-003-1035ND
2016-06-024417-013-0955ND
2016-06-024417-032-1015ND
2016-06-073761-801-11055.00 ppb
2016-06-073761-802-13003.60 ppb
2016-06-073761-803-0920ND
2016-06-073761-804-0950ND
2016-06-073761-805-11251.30 ppb
2016-06-073761-806-10554.80 ppb
2016-06-073761-807-1005ND
2016-06-073761-808-10404.80 ppb
2016-08-174417-022-0950ND
2016-09-063761-801-12005.90 ppb
2016-09-063761-802-08002.30 ppb
2016-09-063761-803-1000ND
2016-09-063761-804-1035ND
2016-09-063761-805-1010ND
2016-09-063761-806-1145ND
2016-09-063761-807-1045ND
2016-09-063761-808-1110ND
2016-09-134417-009-0905ND
2016-11-294417-009-1025ND
2016-11-294417-022-1045ND
2016-12-063761-801-09204.50 ppb
2016-12-063761-802-1125ND
2016-12-063761-803-0910ND
2016-12-063761-804-0750ND
2016-12-063761-805-0945ND
2016-12-063761-806-09305.10 ppb
2016-12-063761-807-0815ND
2016-12-063761-808-10005.00 ppb
2016-12-074417-036-0910ND
2017-01-314417-008-1020ND
2017-01-314417-017-0950ND
2017-02-064417-003-1000ND
2017-02-064417-009-1025ND
2017-02-064417-011-1110ND
2017-02-064417-016-1050ND
2017-02-064417-022-1130ND
2017-02-064417-036-0850ND
2017-03-064417-012-0935ND
2017-03-073761-801-1140ND
2017-03-073761-802-13052.40 ppb
2017-03-073761-803-1050ND
2017-03-073761-804-0925ND
2017-03-073761-805-1105ND
2017-03-073761-806-1125ND
2017-03-073761-807-0950ND
2017-03-073761-808-1030ND
2017-03-274417-012-0945ND
2017-03-274417-012-1000ND
2017-05-114417-009-1030ND
2017-05-114417-012-1105ND
2017-05-114417-013-0830ND
2017-05-114417-022-1005ND
2017-05-314417-032-0935ND
2017-05-314417-036-0840ND
2017-06-063761-801-11355.70 ppb
2017-06-063761-802-1250ND
2017-06-063761-803-1050ND
2017-06-063761-804-0920ND
2017-06-063761-805-1100ND
2017-06-063761-806-11201.50 ppb
2017-06-063761-807-0940ND
2017-06-063761-808-1025ND
2017-07-274417-036-1140ND
2017-09-053761-801-09555.90 ppb
2017-09-053761-802-11205.10 ppb
2017-09-053761-803-09202.30 ppb
2017-09-053761-804-08254.00 ppb
2017-09-053761-805-09308.30 ppb
2017-09-053761-806-09455.50 ppb
2017-09-053761-807-08403.20 ppb
2017-09-053761-808-09106.20 ppb
2017-09-074417-009-1115ND
2017-09-074417-022-1140ND
2017-11-294417-009-1000ND
2017-11-294417-022-1020ND
2017-12-053761-801-10003.30 ppb
2017-12-053761-802-07453.10 ppb
2017-12-053761-803-0830ND
2017-12-053761-804-09051.80 ppb
2017-12-053761-805-1025ND
2017-12-053761-806-09453.40 ppb
2017-12-053761-807-09151.60 ppb
2017-12-053761-808-08403.50 ppb
2018-01-304417-022-0915ND
2018-02-134417-011-1010ND
2018-02-134417-016-0940ND
2018-02-224417-003-0900ND
2018-02-224417-009-0930ND
2018-03-063761-801-10402.70 ppb
2018-03-063761-802-1125ND
2018-03-063761-803-0955ND
2018-03-063761-804-1010ND
2018-03-063761-805-0935ND
2018-03-063761-806-1050ND
2018-03-063761-807-1020ND
2018-03-063761-808-1030ND
2018-03-084417-012-0850ND
2018-03-214417-008-0910ND
2018-03-214417-017-0850ND
2018-06-054417-012-1030ND
2018-06-054417-032-1000ND
2018-06-054417-036-0920ND
2018-06-053761-801-10355.20 ppb
2018-06-053761-802-1210ND
2018-06-053761-803-0840ND
2018-06-053761-804-0930ND
2018-06-053761-806-1020ND
2018-06-053761-807-0945ND
2018-06-053761-808-0900ND
2018-06-074417-011-1010ND
2018-06-074417-013-1040ND
2018-06-213761-805-1015ND
2018-08-064417-011-1145ND
2018-09-043761-801-10404.70 ppb
2018-09-043761-802-1240ND
2018-09-043761-803-0855ND
2018-09-043761-804-0935ND
2018-09-043761-805-1105ND
2018-09-043761-806-10255.20 ppb
2018-09-043761-807-0955ND
2018-09-043761-808-09154.90 ppb
2018-10-304417-011-0935ND
2018-12-043761-801-11104.20 ppb
2018-12-043761-802-12304.80 ppb
2018-12-043761-803-0900ND
2018-12-043761-804-0945ND
2018-12-043761-805-1030ND
2018-12-043761-806-1100ND
2018-12-043761-807-1000ND
2018-12-043761-808-0920ND
2019-02-194417-003-0955ND
2019-02-194417-009-0905ND
2019-02-194417-011-1030ND
2019-02-194417-022-0930ND
2019-02-214417-012-0835ND
2019-02-214417-013-0910ND
2019-02-214417-016-0850ND
2019-02-254417-032-1000ND
2019-02-254417-036-0940ND
2019-03-053761-801-1044ND
2019-03-053761-802-0747ND
2019-03-053761-803-0900ND
2019-03-053761-804-0940ND
2019-03-053761-805-1052ND
2019-03-053761-806-1025ND
2019-03-053761-807-0956ND
2019-03-053761-808-0915ND
2019-05-234417-011-0845ND
2019-06-043761-801-11002.70 ppb
2019-06-043761-802-07501.10 ppb
2019-06-043761-803-0925ND
2019-06-043761-804-1010ND
2019-06-043761-805-0910ND
2019-06-043761-806-10452.20 ppb
2019-06-043761-807-1020ND
2019-06-043761-808-09452.80 ppb
2019-07-154417-011-1120ND
2019-09-033761-801-09552.50 ppb
2019-09-033761-802-12051.30 ppb
2019-09-033761-803-0825ND
2019-09-033761-804-0920ND
2019-09-033761-805-1030ND
2019-09-033761-806-09452.60 ppb
2019-09-033761-807-0930ND
2019-09-033761-808-08454.00 ppb
2019-10-284417-011-0925ND
2019-12-033761-801-1225ND
2019-12-033761-802-09151.20 ppb
2019-12-033761-803-1050ND
2019-12-033761-804-1125ND
2019-12-033761-805-1110ND
2019-12-033761-806-1215ND
2019-12-033761-807-1135ND
2019-12-033761-808-1155ND