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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

City of Torrance Water Department

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

 

258

Samples

0

Samples exceeding legal limit (MCL)

184

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20146.50 ppb4532ND - 16.7 ppb
20157.76 ppb4031ND - 24.0 ppb
20168.05 ppb3732ND - 23.2 ppb
20177.58 ppb3631ND - 18.9 ppb
20182.18 ppb5030ND - 6.10 ppb
20191.64 ppb5028ND - 5.00 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
2014-02-059588-009-1008ND
2014-02-059588-011-1015ND
2014-02-059588-016-0950ND
2014-03-043761-800-10583.60 ppb
2014-03-043761-801-12158.90 ppb
2014-03-043761-802-11345.20 ppb
2014-03-043761-803-11124.80 ppb
2014-03-043761-804-10473.60 ppb
2014-03-043761-805-12247.20 ppb
2014-03-043761-806-10349.00 ppb
2014-03-043761-807-114912.9 ppb
2014-04-229588-016-1025ND
2014-06-053761-800-10502.90 ppb
2014-06-053761-801-090515.4 ppb
2014-06-053761-802-084015.4 ppb
2014-06-053761-803-10353.20 ppb
2014-06-053761-804-11053.60 ppb
2014-06-053761-805-100514.8 ppb
2014-06-053761-806-112010.8 ppb
2014-06-053761-807-082016.7 ppb
2014-06-249588-009-1000ND
2014-06-249588-009-1008ND
2014-06-249588-011-1008ND
2014-07-309588-009-1010ND
2014-07-309588-010-1015ND
2014-07-309588-011-1020ND
2014-07-309588-016-1035ND
2014-09-113761-800-09003.60 ppb
2014-09-113761-801-102016.2 ppb
2014-09-113761-802-123015.7 ppb
2014-09-113761-803-09103.10 ppb
2014-09-113761-804-09203.00 ppb
2014-09-113761-805-102516.4 ppb
2014-09-113761-806-095016.4 ppb
2014-09-113761-807-125015.4 ppb
2014-11-259588-016-1000ND
2014-12-093761-800-10258.00 ppb
2014-12-093761-801-09155.00 ppb
2014-12-093761-802-102010.2 ppb
2014-12-093761-803-110010.8 ppb
2014-12-093761-804-10409.10 ppb
2014-12-093761-805-09255.30 ppb
2014-12-093761-806-13005.80 ppb
2014-12-093761-807-100510.6 ppb
2014-12-309588-009-1010ND
2015-03-233761-800-095512.4 ppb
2015-03-233761-801-103511.9 ppb
2015-03-233761-802-140012.1 ppb
2015-03-233761-803-092511.9 ppb
2015-03-233761-804-093512.3 ppb
2015-03-233761-805-132011.6 ppb
2015-03-233761-806-094512.9 ppb
2015-03-233761-807-134511.7 ppb
2015-03-319588-009-0901ND
2015-03-319588-016-0922ND
2015-04-219588-009-0933ND
2015-05-209588-016-0930ND
2015-06-183761-800-09102.80 ppb
2015-06-183761-801-09559.40 ppb
2015-06-183761-802-12354.70 ppb
2015-06-183761-803-09153.00 ppb
2015-06-183761-804-09252.90 ppb
2015-06-183761-805-10009.80 ppb
2015-06-183761-806-093313.6 ppb
2015-06-183761-807-102313.9 ppb
2015-07-299588-009-0934ND
2015-07-299588-016-1004ND
2015-09-033761-800-08253.20 ppb
2015-09-033761-801-092523.7 ppb
2015-09-033761-802-10106.20 ppb
2015-09-033761-803-08403.40 ppb
2015-09-033761-804-08473.00 ppb
2015-09-033761-805-093024.0 ppb
2015-09-033761-806-085824.0 ppb
2015-09-033761-807-095521.3 ppb
2015-10-289588-009-0926ND
2015-10-289588-016-0951ND
2015-12-083761-800-08553.10 ppb
2015-12-083761-801-10078.90 ppb
2015-12-083761-802-1050ND
2015-12-083761-803-09052.80 ppb
2015-12-083761-804-09113.00 ppb
2015-12-083761-805-10159.50 ppb
2015-12-083761-806-09218.70 ppb
2015-12-083761-807-10358.70 ppb
2016-02-239588-016-0932ND
2016-03-029588-009-0919ND
2016-03-093761-800-09003.20 ppb
2016-03-093761-801-09473.00 ppb
2016-03-093761-802-10093.10 ppb
2016-03-093761-803-09102.80 ppb
2016-03-093761-804-09173.20 ppb
2016-03-093761-805-09533.20 ppb
2016-03-093761-806-09263.40 ppb
2016-03-093761-807-10403.70 ppb
2016-05-129588-009-0906ND
2016-05-129588-016-0930ND
2016-06-083761-800-08558.90 ppb
2016-06-083761-801-09429.20 ppb
2016-06-083761-802-102010.9 ppb
2016-06-083761-803-09059.30 ppb
2016-06-083761-804-091511.6 ppb
2016-06-083761-805-095011.9 ppb
2016-06-083761-806-092511.7 ppb
2016-06-083761-807-103511.1 ppb
2016-09-073761-800-085014.6 ppb
2016-09-073761-801-09507.10 ppb
2016-09-073761-802-104020.0 ppb
2016-09-073761-803-090014.3 ppb
2016-09-073761-804-090717.3 ppb
2016-09-073761-805-10009.20 ppb
2016-09-073761-806-092023.2 ppb
2016-09-073761-807-102619.1 ppb
2016-09-279588-016-0910ND
2016-12-073761-800-09067.20 ppb
2016-12-073761-801-10107.70 ppb
2016-12-073761-802-11007.50 ppb
2016-12-073761-803-09157.00 ppb
2016-12-073761-804-09247.80 ppb
2016-12-073761-805-10158.10 ppb
2016-12-073761-806-09459.10 ppb
2016-12-073761-807-10358.40 ppb
2017-01-319588-016-0920ND
2017-03-073761-800-09352.90 ppb
2017-03-073761-801-103013.8 ppb
2017-03-073761-802-11159.30 ppb
2017-03-073761-803-09452.30 ppb
2017-03-073761-804-10104.60 ppb
2017-03-073761-805-104018.9 ppb
2017-03-073761-806-100016.6 ppb
2017-03-073761-807-110018.8 ppb
2017-04-199588-016-0915ND
2017-06-063761-800-09104.40 ppb
2017-06-063761-801-100317.7 ppb
2017-06-063761-802-104114.5 ppb
2017-06-063761-803-09205.40 ppb
2017-06-063761-804-09273.60 ppb
2017-06-063761-805-100914.6 ppb
2017-06-063761-806-093611.3 ppb
2017-06-063761-807-102913.6 ppb
2017-09-123761-800-09053.50 ppb
2017-09-123761-801-095817.9 ppb
2017-09-123761-802-105312.4 ppb
2017-09-123761-803-09154.60 ppb
2017-09-123761-804-09253.00 ppb
2017-09-123761-805-100514.3 ppb
2017-09-123761-806-093515.4 ppb
2017-09-123761-807-102712.8 ppb
2017-10-043761-009-1330ND
2017-10-109588-016-0933ND
2017-12-133761-800-09402.40 ppb
2017-12-133761-801-10272.40 ppb
2017-12-133761-802-1243ND
2017-12-133761-803-09491.80 ppb
2017-12-133761-804-10002.20 ppb
2017-12-133761-805-10332.50 ppb
2017-12-133761-806-10062.70 ppb
2017-12-133761-807-13002.60 ppb
2018-01-309588-016-0930ND
2018-02-239588-023-0935ND
2018-02-239588-024-0955ND
2018-03-143761-800-10022.20 ppb
2018-03-143761-801-11353.00 ppb
2018-03-143761-802-11103.20 ppb
2018-03-143761-803-10132.10 ppb
2018-03-143761-804-09512.60 ppb
2018-03-143761-805-11313.60 ppb
2018-03-143761-806-09372.60 ppb
2018-03-143761-807-11003.50 ppb
2018-04-199588-016-0950ND
2018-06-149588-010-0945ND
2018-06-149588-011-0940ND
2018-06-149588-023-1012ND
2018-06-149588-024-0935ND
2018-06-273761-800-08053.00 ppb
2018-06-273761-801-08505.70 ppb
2018-06-273761-802-09494.90 ppb
2018-06-273761-803-08001.10 ppb
2018-06-273761-804-08152.80 ppb
2018-06-273761-805-09003.30 ppb
2018-06-273761-806-08255.40 ppb
2018-06-273761-807-09255.00 ppb
2018-08-029588-010-0940ND
2018-08-029588-011-0942ND
2018-08-029588-016-1030ND
2018-08-029588-023-1000ND
2018-08-029588-024-0933ND
2018-09-173761-800-0805ND
2018-09-173761-801-09155.00 ppb
2018-09-173761-802-10255.30 ppb
2018-09-173761-803-0730ND
2018-09-173761-804-08152.60 ppb
2018-09-173761-805-09254.50 ppb
2018-09-173761-806-08255.90 ppb
2018-09-173761-807-10106.10 ppb
2018-11-089588-010-1020ND
2018-11-089588-011-1045ND
2018-11-089588-016-1005ND
2018-11-089588-023-0948ND
2018-11-089588-024-1037ND
2018-12-043761-800-09252.10 ppb
2018-12-043761-801-08454.20 ppb
2018-12-043761-802-08152.80 ppb
2018-12-043761-803-09501.90 ppb
2018-12-043761-804-09202.10 ppb
2018-12-043761-805-08353.60 ppb
2018-12-043761-806-09103.70 ppb
2018-12-043761-807-08005.00 ppb
2019-01-239588-010-0948ND
2019-01-239588-011-0945ND
2019-01-239588-016-1033ND
2019-01-239588-023-1010ND
2019-01-239588-024-0940ND
2019-03-203761-800-08252.60 ppb
2019-03-203761-801-0905ND
2019-03-203761-802-1000ND
2019-03-203761-803-07451.80 ppb
2019-03-203761-804-08002.60 ppb
2019-03-203761-805-0915ND
2019-03-203761-806-08104.40 ppb
2019-03-203761-807-09455.00 ppb
2019-05-019588-010-0945ND
2019-05-019588-011-0940ND
2019-05-019588-016-0957ND
2019-05-019588-024-0934ND
2019-06-253761-800-08203.30 ppb
2019-06-253761-801-09101.50 ppb
2019-06-253761-802-09504.00 ppb
2019-06-253761-803-08102.60 ppb
2019-06-253761-804-08302.60 ppb
2019-06-253761-805-09003.60 ppb
2019-06-253761-806-08404.00 ppb
2019-06-253761-807-09304.00 ppb
2019-08-149588-010-0933ND
2019-08-149588-011-0929ND
2019-08-149588-016-1130ND
2019-08-149588-023-0955ND
2019-09-183761-800-07453.70 ppb
2019-09-183761-801-08302.00 ppb
2019-09-183761-802-09304.40 ppb
2019-09-183761-803-07352.80 ppb
2019-09-183761-804-0755ND
2019-09-183761-805-08402.00 ppb
2019-09-183761-806-08053.30 ppb
2019-09-183761-807-09114.00 ppb
2019-10-309588-010-0935ND
2019-10-309588-011-0950ND
2019-10-309588-016-1028ND
2019-10-309588-023-1005ND
2019-10-309588-024-0928ND
2019-12-113761-800-08002.90 ppb
2019-12-113761-801-08451.70 ppb
2019-12-113761-802-09401.40 ppb
2019-12-113761-803-07452.20 ppb
2019-12-113761-804-08102.90 ppb
2019-12-113761-805-08551.90 ppb
2019-12-113761-806-08252.40 ppb
2019-12-113761-807-09252.50 ppb