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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Jordan Valley Water Conservancy 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.

MORE ABOUT THIS CONTAMINANT

 

173

Samples

0

Samples exceeding legal limit (MCL)

154

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
201420.6 ppb3731ND - 66.7 ppb
201532.2 ppb3532ND - 83.2 ppb
201633.0 ppb3534ND - 92.9 ppb
201726.9 ppb3833ND - 70.6 ppb
201822.4 ppb1816ND - 34.7 ppb
201910.1 ppb108ND - 24.3 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
2014-01-02ND
2014-01-02ND
2014-01-06ND
2014-01-06ND
2014-01-0611.1 ppb
2014-01-068.85 ppb
2014-01-060.598 ppb
2014-01-0611.6 ppb
2014-01-06ND
2014-01-0610.6 ppb
2014-01-0713.7 ppb
2014-01-0712.3 ppb
2014-04-0713.1 ppb
2014-04-0732.4 ppb
2014-04-0719.0 ppb
2014-04-0719.1 ppb
2014-04-0729.2 ppb
2014-04-0721.6 ppb
2014-04-0819.0 ppb
2014-04-0820.0 ppb
2014-07-0720.7 ppb
2014-07-0726.6 ppb
2014-07-0713.4 ppb
2014-07-0720.6 ppb
2014-07-0711.3 ppb
2014-07-0722.4 ppb
2014-07-0716.3 ppb
2014-07-0715.8 ppb
2014-07-15ND
2014-10-0631.7 ppb
2014-10-0650.7 ppb
2014-10-0638.5 ppb
2014-10-0666.7 ppb
2014-10-0649.3 ppb
2014-10-0656.8 ppb
2014-10-0634.6 ppb
2014-10-0643.8 ppb
2015-01-0539.3 ppb
2015-01-050.504 ppb
2015-01-0526.4 ppb
2015-01-05ND
2015-01-0537.3 ppb
2015-01-0534.1 ppb
2015-01-0527.5 ppb
2015-01-0530.6 ppb
2015-01-13ND
2015-01-15ND
2015-02-180.500 ppb
2015-04-060.703 ppb
2015-04-0634.5 ppb
2015-04-0635.6 ppb
2015-04-0624.5 ppb
2015-04-0633.0 ppb
2015-04-0623.1 ppb
2015-04-0622.5 ppb
2015-04-0723.8 ppb
2015-07-0625.2 ppb
2015-07-0622.2 ppb
2015-07-0621.2 ppb
2015-07-0630.2 ppb
2015-07-0612.3 ppb
2015-07-0629.6 ppb
2015-07-0619.3 ppb
2015-07-0627.5 ppb
2015-10-0555.4 ppb
2015-10-0568.0 ppb
2015-10-0552.6 ppb
2015-10-0578.4 ppb
2015-10-0565.6 ppb
2015-10-0577.6 ppb
2015-10-0564.7 ppb
2015-10-0583.2 ppb
2016-01-0411.8 ppb
2016-01-0415.7 ppb
2016-01-047.00 ppb
2016-01-0417.4 ppb
2016-01-0413.6 ppb
2016-01-0417.3 ppb
2016-01-0429.8 ppb
2016-01-0420.7 ppb
2016-03-2214.7 ppb
2016-03-228.50 ppb
2016-04-049.80 ppb
2016-04-0422.5 ppb
2016-04-0423.1 ppb
2016-04-0428.1 ppb
2016-04-0415.1 ppb
2016-04-0423.8 ppb
2016-04-0418.4 ppb
2016-04-0430.3 ppb
2016-07-0740.0 ppb
2016-07-079.62 ppb
2016-07-0726.9 ppb
2016-07-0728.5 ppb
2016-07-0744.8 ppb
2016-07-0741.5 ppb
2016-07-0743.8 ppb
2016-07-0736.3 ppb
2016-07-14ND
2016-10-0392.9 ppb
2016-10-0377.7 ppb
2016-10-0392.7 ppb
2016-10-0355.0 ppb
2016-10-0368.1 ppb
2016-10-0357.4 ppb
2016-10-0366.2 ppb
2016-10-0344.8 ppb
2017-01-03ND
2017-01-03ND
2017-01-03ND
2017-01-0334.1 ppb
2017-01-0322.5 ppb
2017-01-0324.0 ppb
2017-01-0326.5 ppb
2017-01-033.92 ppb
2017-01-034.52 ppb
2017-01-033.81 ppb
2017-01-0330.8 ppb
2017-01-04ND
2017-01-1832.9 ppb
2017-04-031.80 ppb
2017-04-030.980 ppb
2017-04-0342.6 ppb
2017-04-0317.0 ppb
2017-04-0335.0 ppb
2017-04-0338.4 ppb
2017-04-0342.1 ppb
2017-04-0331.3 ppb
2017-07-0534.6 ppb
2017-07-0540.6 ppb
2017-07-0516.5 ppb
2017-07-0548.6 ppb
2017-07-0528.3 ppb
2017-07-0547.5 ppb
2017-07-0543.3 ppb
2017-07-0542.7 ppb
2017-08-14ND
2017-10-0244.3 ppb
2017-10-0229.7 ppb
2017-10-0270.6 ppb
2017-10-0231.1 ppb
2017-10-0265.4 ppb
2017-10-0224.6 ppb
2017-10-0232.7 ppb
2017-10-0227.6 ppb
2018-01-10ND
2018-04-0223.2 ppb
2018-04-0220.0 ppb
2018-04-0220.4 ppb
2018-04-0234.7 ppb
2018-04-0233.3 ppb
2018-04-0226.9 ppb
2018-04-0227.5 ppb
2018-04-0224.4 ppb
2018-06-05ND
2018-07-0223.1 ppb
2018-07-0233.4 ppb
2018-07-0215.1 ppb
2018-07-0228.8 ppb
2018-07-0231.6 ppb
2018-07-0225.5 ppb
2018-07-0228.4 ppb
2018-07-026.18 ppb
2019-01-0317.1 ppb
2019-01-0317.4 ppb
2019-01-03ND
2019-01-0324.3 ppb
2019-01-036.01 ppb
2019-01-0316.6 ppb
2019-01-033.14 ppb
2019-01-0311.5 ppb
2019-04-245.30 ppb
2019-07-22ND