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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Salt Lake City Water System

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

 

200

Samples

0

Samples exceeding legal limit (MCL)

118

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.181 ppb314ND - 2.30 ppb
201510.3 ppb3315ND - 47.3 ppb
20160.521 ppb298ND - 4.70 ppb
20174.55 ppb223.60 ppb - 5.50 ppb
201831.4 ppb36367.46 ppb - 55.4 ppb
201920.3 ppb6953ND - 42.8 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 Result
2014-01-10ND
2014-01-10ND
2014-05-30ND
2014-05-30ND
2014-05-30ND
2014-05-30ND
2014-06-03ND
2014-06-03ND
2014-06-06ND
2014-06-06ND
2014-06-06ND
2014-06-112.30 ppb
2014-06-112.30 ppb
2014-06-25ND
2014-06-25ND
2014-06-25ND
2014-06-25ND
2014-07-01ND
2014-07-01ND
2014-07-01ND
2014-07-01ND
2014-07-02ND
2014-07-02ND
2014-07-09ND
2014-07-09ND
2014-07-09ND
2014-07-09ND
2014-07-09ND
2014-07-09ND
2014-07-110.500 ppb
2014-07-110.500 ppb
2015-01-30ND
2015-01-30ND
2015-02-274.90 ppb
2015-05-08ND
2015-05-15ND
2015-06-19ND
2015-06-19ND
2015-06-19ND
2015-06-29ND
2015-06-302.20 ppb
2015-06-30ND
2015-06-30ND
2015-07-07ND
2015-07-10ND
2015-07-100.600 ppb
2015-07-10ND
2015-08-07ND
2015-09-04ND
2015-09-18ND
2015-09-29ND
2015-09-29ND
2015-10-2739.3 ppb
2015-10-2716.7 ppb
2015-10-2723.6 ppb
2015-10-2723.4 ppb
2015-10-2745.8 ppb
2015-10-2747.3 ppb
2015-10-2729.0 ppb
2015-10-2729.5 ppb
2015-10-276.40 ppb
2015-10-276.90 ppb
2015-10-2728.3 ppb
2015-10-2737.0 ppb
2016-01-082.30 ppb
2016-01-084.70 ppb
2016-01-150.700 ppb
2016-02-122.50 ppb
2016-02-26ND
2016-03-25ND
2016-05-18ND
2016-05-181.50 ppb
2016-05-18ND
2016-05-19ND
2016-05-19ND
2016-06-03ND
2016-06-03ND
2016-06-10ND
2016-06-10ND
2016-06-10ND
2016-06-24ND
2016-06-24ND
2016-06-24ND
2016-06-28ND
2016-06-282.00 ppb
2016-07-010.800 ppb
2016-07-08ND
2016-07-08ND
2016-07-13ND
2016-07-290.600 ppb
2016-07-29ND
2016-07-29ND
2016-08-05ND
2017-01-165.50 ppb
2017-01-163.60 ppb
2018-04-1029.9 ppb
2018-04-1026.6 ppb
2018-04-1028.4 ppb
2018-04-1028.6 ppb
2018-04-1033.7 ppb
2018-04-1030.8 ppb
2018-04-1022.9 ppb
2018-04-1023.5 ppb
2018-04-1020.2 ppb
2018-04-1019.9 ppb
2018-04-107.46 ppb
2018-04-1026.9 ppb
2018-07-1031.7 ppb
2018-07-1042.8 ppb
2018-07-1032.6 ppb
2018-07-1033.1 ppb
2018-07-1035.4 ppb
2018-07-1035.2 ppb
2018-07-1029.8 ppb
2018-07-1029.5 ppb
2018-07-1030.5 ppb
2018-07-1030.4 ppb
2018-07-1015.7 ppb
2018-07-1027.9 ppb
2018-10-2333.7 ppb
2018-10-2335.8 ppb
2018-10-2328.5 ppb
2018-10-2332.0 ppb
2018-10-2348.0 ppb
2018-10-2347.5 ppb
2018-10-2355.4 ppb
2018-10-2346.2 ppb
2018-10-2340.8 ppb
2018-10-2341.7 ppb
2018-10-2322.9 ppb
2018-10-2324.4 ppb
2019-01-114.40 ppb
2019-01-113.60 ppb
2019-01-1522.3 ppb
2019-01-1519.2 ppb
2019-01-1519.0 ppb
2019-01-1518.1 ppb
2019-01-1525.5 ppb
2019-01-1523.2 ppb
2019-01-1517.6 ppb
2019-01-1518.2 ppb
2019-01-1514.2 ppb
2019-01-1514.3 ppb
2019-01-158.77 ppb
2019-01-1515.7 ppb
2019-02-013.00 ppb
2019-04-0921.8 ppb
2019-04-0928.5 ppb
2019-04-0933.0 ppb
2019-04-0933.7 ppb
2019-04-0941.4 ppb
2019-04-0937.4 ppb
2019-04-0935.5 ppb
2019-04-0936.2 ppb
2019-04-0924.5 ppb
2019-04-0924.1 ppb
2019-04-0912.0 ppb
2019-04-0930.9 ppb
2019-04-260.600 ppb
2019-05-03ND
2019-05-31ND
2019-06-19ND
2019-06-19ND
2019-06-21ND
2019-06-25ND
2019-06-26ND
2019-06-27ND
2019-07-03ND
2019-07-03ND
2019-07-0937.2 ppb
2019-07-0933.9 ppb
2019-07-0932.7 ppb
2019-07-0932.5 ppb
2019-07-0938.0 ppb
2019-07-0933.0 ppb
2019-07-0929.6 ppb
2019-07-0931.6 ppb
2019-07-0931.8 ppb
2019-07-0931.9 ppb
2019-07-099.27 ppb
2019-07-0932.7 ppb
2019-07-23ND
2019-07-23ND
2019-07-23ND
2019-07-231.70 ppb
2019-08-07ND
2019-08-16ND
2019-08-16ND
2019-10-0822.6 ppb
2019-10-0840.4 ppb
2019-10-0840.4 ppb
2019-10-0842.8 ppb
2019-10-0841.0 ppb
2019-10-0838.0 ppb
2019-10-0838.7 ppb
2019-10-0836.2 ppb
2019-10-0836.1 ppb
2019-10-0832.4 ppb
2019-10-0834.6 ppb
2019-10-0836.8 ppb