Menu

EWG's Tap Water Database — 2019 UPDATE

Donate

Chloroform

City of Ripon

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.

 

80

Samples

0

Samples exceeding legal limit (MCL)

14

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND40ND
2013ND60ND
20140.692 ppb125ND - 3.00 ppb
2015ND210ND
20160.132 ppb194ND - 0.700 ppb
20170.217 ppb185ND - 1.10 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
2012-06-132625-007-0927ND
2012-06-132625-003-0725ND
2012-06-132625-022-1013ND
2012-07-182625-024-1040ND
2013-06-262625-010-1425ND
2013-10-292625-020-0935ND
2013-11-052625-900-0850ND
2013-11-052625-902-0950ND
2013-11-052625-901-0938ND
2013-11-052625-903-1050ND
2014-02-052625-901-11153.00 ppb
2014-02-052625-900-10061.40 ppb
2014-02-052625-903-10272.10 ppb
2014-02-052625-902-11401.30 ppb
2014-05-072625-901-13520.500 ppb
2014-05-072625-900-1334ND
2014-05-072625-902-1408ND
2014-05-072625-903-1311ND
2014-08-112625-900-0951ND
2014-08-112625-902-1100ND
2014-08-112625-903-0916ND
2014-08-112625-901-1047ND
2015-02-182625-903-0958ND
2015-02-182625-901-1035ND
2015-02-182625-902-1047ND
2015-02-182625-900-1017ND
2015-05-052625-901-0945ND
2015-05-052625-903-0925ND
2015-05-052625-902-1000ND
2015-05-052625-900-0910ND
2015-06-082625-003-1138ND
2015-06-082625-022-1030ND
2015-06-082625-007-0955ND
2015-07-082625-024-0955ND
2015-08-055810-903-0915ND
2015-08-055810-901-0935ND
2015-08-055810-902-1000ND
2015-08-055810-900-0900ND
2015-11-032625-903-0945ND
2015-11-032625-900-0945ND
2015-11-032625-903-0920ND
2015-11-032625-901-1015ND
2015-11-032625-902-1045ND
2016-02-112625-900-1035ND
2016-02-112625-902-0910ND
2016-02-112625-901-1020ND
2016-02-112625-903-1055ND
2016-05-032625-901-14150.700 ppb
2016-05-032625-903-14300.600 ppb
2016-05-032625-900-14450.500 ppb
2016-05-032625-902-14000.700 ppb
2016-06-152625-003-0800ND
2016-06-152625-010-0820ND
2016-08-032625-900-1420ND
2016-08-032625-902-1345ND
2016-08-032625-901-1400ND
2016-08-032625-903-1410ND
2016-10-202625-020-1045ND
2016-11-022625-901-0830ND
2016-11-022625-900-0815ND
2016-11-022625-903-0900ND
2016-11-022625-902-0845ND
2017-02-022625-902-1134ND
2017-02-022625-903-1110ND
2017-02-022625-900-1047ND
2017-02-022625-901-1120ND
2017-05-182625-900-07570.700 ppb
2017-05-182625-902-09100.700 ppb
2017-05-182625-903-0934ND
2017-05-182625-901-0825ND
2017-06-142625-010-0930ND
2017-08-012625-902-0958ND
2017-08-012625-901-1022ND
2017-08-012625-903-0905ND
2017-08-012625-900-0835ND
2017-10-242625-020-1020ND
2017-11-152625-902-13501.10 ppb
2017-11-152625-903-13250.500 ppb
2017-11-152625-900-13050.900 ppb
2017-11-152625-901-1410ND