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EWG's Tap Water Database — 2019 UPDATE

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Chloroform

Florin County 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.

 

31

Samples

0

Samples exceeding legal limit (MCL)

3

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20121.20 ppb221.000 ppb - 1.40 ppb
20131.55 ppb41ND - 6.20 ppb
2014ND70ND
2015ND170ND
2016ND10ND
2017N/A00N/A

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
2012-05-305810-009-09561.000 ppb
2012-08-295810-003-09371.40 ppb
2013-04-155810-012-13256.20 ppb
2013-07-185810-007-0914ND
2013-12-125810-007-0950ND
2013-12-125810-006-1427ND
2014-04-305810-009-1200ND
2014-04-305810-003-0927ND
2014-04-305810-004-1054ND
2014-04-305810-006-1241ND
2014-04-305810-007-0841ND
2014-04-305810-002-1017ND
2014-08-075810-010-1305ND
2015-02-115810-009-1216ND
2015-02-115810-004-1115ND
2015-02-115810-007-0906ND
2015-02-115810-010-1305ND
2015-02-115810-012-0948ND
2015-02-115810-006-1402ND
2015-05-275810-003-1012ND
2015-05-275810-012-0923ND
2015-05-275810-004-1053ND
2015-05-275810-009-1159ND
2015-05-275810-006-1258ND
2015-09-235810-003-1044ND
2015-09-235810-004-1147ND
2015-09-235810-006-1336ND
2015-09-235810-007-0932ND
2015-09-235810-009-1247ND
2015-09-235810-012-1009ND
2016-09-085810-012-0941ND