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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Marina Coast Water District

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

 

255

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND470ND
2015ND470ND
2016ND490ND
2017ND370ND
2018ND370ND
2019ND380ND

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
2014-01-079590-026-1005ND
2014-01-079590-028-0905ND
2014-01-079590-033-0920ND
2014-01-079590-034-0935ND
2014-01-079590-801-0845ND
2014-01-079590-802-0853ND
2014-01-079590-803-0910ND
2014-01-079590-804-0810ND
2014-02-262909-026-0805ND
2014-02-262909-028-0745ND
2014-02-262909-028-0750ND
2014-04-089590-801-0745ND
2014-04-089590-802-0730ND
2014-04-089590-803-0800ND
2014-04-089590-804-0700ND
2014-04-229590-026-0840ND
2014-04-229590-028-0735ND
2014-04-229590-033-0755ND
2014-04-229590-034-0815ND
2014-06-262909-026-0805ND
2014-06-262909-028-0745ND
2014-06-262909-028-0750ND
2014-07-089590-008-0741ND
2014-07-089590-010-1041ND
2014-07-089590-026-1000ND
2014-07-089590-028-0900ND
2014-07-089590-033-0930ND
2014-07-089590-034-0828ND
2014-07-089590-801-0900ND
2014-07-089590-802-0822ND
2014-07-089590-803-0750ND
2014-07-089590-804-0930ND
2014-07-229590-009-0745ND
2014-09-182909-026-0825ND
2014-09-182909-028-0754ND
2014-09-182909-028-0800ND
2014-10-019590-801-0810ND
2014-10-019590-802-0730ND
2014-10-019590-803-0850ND
2014-10-019590-804-0700ND
2014-10-299590-026-0920ND
2014-10-299590-028-0800ND
2014-10-299590-033-0820ND
2014-10-299590-034-0845ND
2014-12-182909-026-0830ND
2014-12-182909-028-0805ND
2014-12-182909-028-0810ND
2015-01-069590-026-0942ND
2015-01-069590-028-0917ND
2015-01-069590-033-0853ND
2015-01-069590-034-0826ND
2015-01-139590-801-0835ND
2015-01-139590-802-0810ND
2015-01-139590-803-0855ND
2015-01-139590-804-0920ND
2015-03-262909-026-0810ND
2015-03-262909-028-0755ND
2015-03-262909-028-0800ND
2015-04-149590-026-0930ND
2015-04-149590-028-0840ND
2015-04-149590-033-0850ND
2015-04-149590-034-0820ND
2015-04-149590-801-0840ND
2015-04-149590-802-0910ND
2015-04-149590-803-0749ND
2015-04-149590-804-0939ND
2015-06-242909-026-0752ND
2015-06-242909-028-0735ND
2015-06-242909-028-0740ND
2015-07-079590-008-0830ND
2015-07-079590-009-0805ND
2015-07-079590-010-0745ND
2015-07-079590-026-1020ND
2015-07-079590-028-0950ND
2015-07-079590-033-0930ND
2015-07-079590-034-0900ND
2015-07-079590-801-0830ND
2015-07-079590-802-0800ND
2015-07-079590-803-0847ND
2015-07-079590-804-0730ND
2015-09-302909-026-0820ND
2015-09-302909-028-0745ND
2015-09-302909-028-0750ND
2015-10-209590-801-0900ND
2015-10-209590-802-0840ND
2015-10-209590-803-0815ND
2015-10-209590-804-0945ND
2015-10-279590-026-0926ND
2015-10-279590-028-0905ND
2015-10-279590-033-0849ND
2015-10-279590-034-0814ND
2015-12-172909-026-0820ND
2015-12-172909-028-0800ND
2015-12-172909-028-0805ND
2016-01-129590-026-0949ND
2016-01-129590-028-0927ND
2016-01-129590-033-0908ND
2016-01-129590-034-0825ND
2016-01-129590-801-0840ND
2016-01-129590-802-0820ND
2016-01-129590-803-0800ND
2016-01-129590-804-0905ND
2016-03-172909-026-0820ND
2016-03-172909-028-0755ND
2016-03-172909-028-0800ND
2016-04-059590-026-0855ND
2016-04-059590-028-0838ND
2016-04-059590-033-0816ND
2016-04-059590-034-0754ND
2016-04-059590-801-0810ND
2016-04-059590-802-0730ND
2016-04-059590-803-0840ND
2016-04-059590-804-0915ND
2016-06-162909-026-0815ND
2016-06-162909-026-0820ND
2016-06-162909-028-0750ND
2016-07-129590-026-1025ND
2016-07-129590-028-0945ND
2016-07-129590-033-0915ND
2016-07-129590-034-0835ND
2016-07-129590-801-0824ND
2016-07-129590-802-0753ND
2016-07-129590-803-0851ND
2016-07-129590-804-0920ND
2016-07-269590-008-0805ND
2016-07-269590-009-0835ND
2016-08-229590-027-1247ND
2016-09-152909-026-0742ND
2016-09-152909-026-0751ND
2016-09-152909-028-0801ND
2016-10-119590-026-0945ND
2016-10-119590-027-0844ND
2016-10-119590-028-0900ND
2016-10-119590-033-0918ND
2016-10-119590-034-0823ND
2016-10-119590-801-0921ND
2016-10-119590-802-0858ND
2016-10-119590-803-0833ND
2016-10-119590-804-1004ND
2016-12-082909-026-0840ND
2016-12-082909-026-0850ND
2016-12-082909-027-0815ND
2016-12-082909-028-0800ND
2017-01-109590-026-0849ND
2017-01-109590-027-1013ND
2017-01-109590-028-0820ND
2017-01-109590-033-0831ND
2017-01-109590-034-0803ND
2017-01-109590-801-0850ND
2017-01-109590-802-0835ND
2017-01-109590-803-0818ND
2017-01-109590-804-0914ND
2017-04-049590-026-0925ND
2017-04-049590-027-0820ND
2017-04-049590-028-0905ND
2017-04-049590-033-0900ND
2017-04-049590-034-0840ND
2017-04-049590-801-0822ND
2017-04-049590-802-0845ND
2017-04-049590-803-0800ND
2017-04-049590-804-0930ND
2017-07-189590-008-0839ND
2017-07-189590-009-0818ND
2017-07-189590-026-1146ND
2017-07-189590-027-1000ND
2017-07-189590-028-1032ND
2017-07-189590-033-1110ND
2017-07-189590-034-0925ND
2017-07-189590-801-0819ND
2017-07-189590-802-0842ND
2017-07-189590-803-0924ND
2017-07-189590-804-0742ND
2017-10-109590-027-0806ND
2017-10-109590-801-0815ND
2017-10-109590-802-0848ND
2017-10-109590-803-0748ND
2017-10-109590-804-0924ND
2017-10-319590-026-0910ND
2017-10-319590-028-0945ND
2017-10-319590-033-1000ND
2018-01-099590-026-1008ND
2018-01-099590-027-0914ND
2018-01-099590-028-0940ND
2018-01-099590-033-0954ND
2018-01-099590-801-0910ND
2018-01-099590-802-0930ND
2018-01-099590-803-0950ND
2018-01-099590-804-0827ND
2018-03-269590-034-0923ND
2018-04-179590-026-1005ND
2018-04-179590-027-0900ND
2018-04-179590-028-0917ND
2018-04-179590-033-0934ND
2018-04-179590-801-0730ND
2018-04-179590-802-0800ND
2018-04-179590-803-0700ND
2018-04-179590-804-0830ND
2018-07-109590-008-0810ND
2018-07-109590-009-0835ND
2018-07-109590-026-1035ND
2018-07-109590-027-0925ND
2018-07-109590-028-0945ND
2018-07-109590-801-0851ND
2018-07-109590-802-0926ND
2018-07-109590-803-0945ND
2018-07-109590-804-0816ND
2018-07-309590-033-0855ND
2018-09-109590-034-0833ND
2018-11-069590-026-1104ND
2018-11-069590-027-0920ND
2018-11-069590-028-0950ND
2018-11-069590-033-1025ND
2018-11-069590-801-0850ND
2018-11-069590-802-0745ND
2018-11-069590-803-0820ND
2018-11-069590-804-0930ND
2018-11-279590-034-1100ND
2019-01-239590-026-1005ND
2019-01-239590-027-0800ND
2019-01-239590-028-0820ND
2019-01-239590-033-0845ND
2019-01-239590-034-0930ND
2019-01-239590-801-0842ND
2019-01-239590-802-0908ND
2019-01-239590-803-0801ND
2019-01-239590-804-0938ND
2019-05-159590-026-1237ND
2019-05-159590-027-1008ND
2019-05-159590-028-1030ND
2019-05-159590-033-1050ND
2019-05-159590-801-0925ND
2019-05-159590-802-0910ND
2019-05-159590-803-0845ND
2019-05-159590-804-0955ND
2019-06-219590-034-1145ND
2019-07-309590-008-0900ND
2019-07-309590-009-0950ND
2019-07-309590-026-1020ND
2019-07-309590-027-0815ND
2019-07-309590-028-0705ND
2019-07-309590-033-0740ND
2019-07-309590-034-0630ND
2019-07-309590-801-0845ND
2019-07-309590-802-0810ND
2019-07-309590-803-0830ND
2019-07-309590-804-0915ND
2019-10-099590-801-0840ND
2019-10-099590-802-0810ND
2019-10-099590-803-0745ND
2019-10-099590-804-0915ND
2019-10-229590-026-1030ND
2019-10-229590-027-0840ND
2019-10-229590-028-0900ND
2019-10-229590-033-0920ND
2019-10-229590-034-0805ND