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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

City of Shafter

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

 

125

Samples

0

Samples exceeding legal limit (MCL)

11

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.0655 ppb111ND - 0.720 ppb
2015ND160ND
20160.147 ppb388ND - 1.10 ppb
2017ND130ND
20180.0476 ppb211ND - 1.000 ppb
20190.0385 ppb261ND - 1.000 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
2014-01-215806-900-1105ND
2014-01-215806-901-1045ND
2014-01-215806-902-1120ND
2014-01-215806-903-1035ND
2014-04-305806-902-1510ND
2014-06-305806-902-13450.720 ppb
2014-08-285806-902-1336ND
2014-09-125806-900-0930ND
2014-09-125806-901-0915ND
2014-09-125806-903-1045ND
2014-11-255806-902-0945ND
2015-01-285806-900-1310ND
2015-01-285806-901-1115ND
2015-01-285806-902-1250ND
2015-01-285806-903-1100ND
2015-04-305806-900-1420ND
2015-04-305806-901-1400ND
2015-04-305806-902-1515ND
2015-04-305806-903-1435ND
2015-06-305806-900-1420ND
2015-06-305806-901-1400ND
2015-06-305806-902-1440ND
2015-06-305806-903-1350ND
2015-09-305806-900-1330ND
2015-09-305806-901-1400ND
2015-09-305806-902-1330ND
2015-09-305806-903-1420ND
2016-01-265867-900-1420ND
2016-01-265867-901-1325ND
2016-01-265867-902-1355ND
2016-01-265867-903-1205ND
2016-02-235867-003-0920ND
2016-02-235867-007-1225ND
2016-02-235867-008-1130ND
2016-02-235867-017-1055ND
2016-02-235867-900-1300ND
2016-02-235867-901-1140ND
2016-02-235867-902-12450.500 ppb
2016-02-235867-903-1200ND
2016-03-295867-900-14000.500 ppb
2016-03-295867-901-1210ND
2016-03-295867-902-1416ND
2016-03-295867-903-1150ND
2016-04-055867-021-1355ND
2016-04-265867-900-15430.700 ppb
2016-04-265867-901-15570.700 ppb
2016-04-265867-902-15251.10 ppb
2016-04-265867-903-16100.700 ppb
2016-05-315867-900-1225ND
2016-05-315867-901-1215ND
2016-05-315867-902-13450.700 ppb
2016-05-315867-903-1145ND
2016-06-285867-900-1215ND
2016-06-285867-901-1235ND
2016-06-285867-902-13350.700 ppb
2016-06-285867-903-1135ND
2016-07-265867-900-1455ND
2016-07-265867-901-1440ND
2016-07-265867-902-1112ND
2016-07-265867-903-1405ND
2016-10-255867-900-1245ND
2016-10-255867-901-1225ND
2016-10-255867-902-1345ND
2016-10-255867-903-1145ND
2016-11-015867-004-1120ND
2017-01-245867-021-1110ND
2017-04-185867-900-1420ND
2017-04-185867-901-1410ND
2017-04-185867-902-1230ND
2017-04-185867-903-1350ND
2017-07-115867-900-1345ND
2017-07-115867-901-1300ND
2017-07-115867-902-1320ND
2017-07-115867-903-1230ND
2017-10-205867-900-1420ND
2017-10-205867-901-1435ND
2017-10-205867-902-1450ND
2017-10-205867-903-1505ND
2018-01-105867-900-1100ND
2018-01-105867-901-1130ND
2018-01-105867-902-1235ND
2018-01-105867-903-1150ND
2018-03-285867-021-1335ND
2018-04-245867-021-1115ND
2018-04-245867-900-1300ND
2018-04-245867-901-1235ND
2018-04-245867-902-0910ND
2018-04-245867-903-1220ND
2018-07-245867-021-1015ND
2018-07-245867-900-11301.000 ppb
2018-07-245867-901-1110ND
2018-07-245867-902-1315ND
2018-07-245867-903-1200ND
2018-10-235867-021-1140ND
2018-10-235867-900-1310ND
2018-10-235867-901-1330ND
2018-10-235867-902-1240ND
2018-10-235867-903-1345ND
2018-11-085806-023-0810ND
2019-01-225867-900-1240ND
2019-01-225867-901-1325ND
2019-01-225867-902-1150ND
2019-01-225867-903-1335ND
2019-01-235806-007-0945ND
2019-01-235806-008-1055ND
2019-01-235806-017-1020ND
2019-01-235806-021-1130ND
2019-01-235806-023-0850ND
2019-02-265867-007-1110ND
2019-02-265867-017-1215ND
2019-04-235867-021-1225ND
2019-04-255867-900-1125ND
2019-04-255867-901-1110ND
2019-04-255867-902-0945ND
2019-04-255867-903-1055ND
2019-06-255867-023-1410ND
2019-07-245867-900-12501.000 ppb
2019-07-245867-901-1225ND
2019-07-245867-902-0825ND
2019-07-245867-903-1205ND
2019-09-165806-023-0800ND
2019-09-275867-900-1015ND
2019-09-275867-901-0950ND
2019-09-275867-902-1108ND
2019-09-275867-903-0845ND