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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Jackson Towwship MUA

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

 

96

Samples

0

Samples exceeding legal limit (MCL)

92

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20141.61 ppb16160.570 ppb - 2.91 ppb
20151.18 ppb16160.590 ppb - 2.94 ppb
20161.30 ppb16160.480 ppb - 2.71 ppb
20171.65 ppb1615ND - 5.22 ppb
20181.80 ppb16160.840 ppb - 4.45 ppb
20191.40 ppb1613ND - 2.86 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
2014-03-13A162592.18 ppb
2014-03-13A162581.38 ppb
2014-03-13A162571.02 ppb
2014-03-13A162601.000 ppb
2014-06-10A168352.27 ppb
2014-06-10A168371.46 ppb
2014-06-10A168342.27 ppb
2014-06-10A168361.72 ppb
2014-09-09A174282.73 ppb
2014-09-09A174442.91 ppb
2014-09-09A174270.970 ppb
2014-09-09A174291.63 ppb
2014-12-11A180010.570 ppb
2014-12-11A180041.05 ppb
2014-12-11A180021.96 ppb
2014-12-11A180030.610 ppb
2015-03-12A186201.64 ppb
2015-03-12A186190.650 ppb
2015-03-12A186170.810 ppb
2015-03-12A186180.590 ppb
2015-06-11A192350.610 ppb
2015-06-11A192331.25 ppb
2015-06-11A192361.56 ppb
2015-06-11A192340.780 ppb
2015-09-10A198391.21 ppb
2015-09-10A198380.730 ppb
2015-09-10A198402.94 ppb
2015-09-10A198411.19 ppb
2015-12-10A204201.000 ppb
2015-12-10A204361.57 ppb
2015-12-10A204231.49 ppb
2015-12-10A204210.790 ppb
2016-03-10A210691.26 ppb
2016-03-10A210700.640 ppb
2016-03-10A204210.530 ppb
2016-03-10A210680.790 ppb
2016-06-09A217170.480 ppb
2016-06-09A217181.22 ppb
2016-06-09A217191.65 ppb
2016-06-09A217162.71 ppb
2016-09-08A223851.42 ppb
2016-09-08A223840.970 ppb
2016-09-08A223861.04 ppb
2016-09-08A223872.02 ppb
2016-12-08A229311.62 ppb
2016-12-08A229321.34 ppb
2016-12-08A229331.77 ppb
2016-12-08A229301.35 ppb
2017-03-08A234791.27 ppb
2017-03-08A234801.02 ppb
2017-03-08A234780.870 ppb
2017-03-08A234771.49 ppb
2017-06-08A241611.60 ppb
2017-06-08A241591.28 ppb
2017-06-08A241601.02 ppb
2017-06-08A241623.70 ppb
2017-09-07A248221.72 ppb
2017-09-07A248231.21 ppb
2017-09-07A248205.22 ppb
2017-09-07A248211.32 ppb
2017-12-07A253822.17 ppb
2017-12-07A253811.39 ppb
2017-12-07A253791.09 ppb
2017-12-07A25380ND
2018-03-08A258751.10 ppb
2018-03-08A258741.08 ppb
2018-03-08A258721.77 ppb
2018-03-08A258730.840 ppb
2018-06-07A264081.51 ppb
2018-06-07A264060.970 ppb
2018-06-07A264072.13 ppb
2018-06-07A264053.96 ppb
2018-09-06A271101.74 ppb
2018-09-06A271124.45 ppb
2018-09-06A271091.50 ppb
2018-09-06A271111.69 ppb
2018-12-06A277431.33 ppb
2018-12-06A277441.41 ppb
2018-12-06A277421.74 ppb
2018-12-06A277451.54 ppb
2019-03-07A282451.18 ppb
2019-03-07A282470.890 ppb
2019-03-07A282461.28 ppb
2019-03-07A282480.880 ppb
2019-06-04A287641.50 ppb
2019-06-04A287622.33 ppb
2019-06-04A28763ND
2019-06-04A287612.86 ppb
2019-09-05A294621.96 ppb
2019-09-05A29464ND
2019-09-05A294632.25 ppb
2019-09-05A294612.83 ppb
2019-12-05A30075ND
2019-12-05A300761.63 ppb
2019-12-05A300771.64 ppb
2019-12-05A300781.13 ppb