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EWG's Tap Water Database — 2019 UPDATE

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Chloroform

Plymouth 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.

 

67

Samples

0

Samples exceeding legal limit (MCL)

60

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.956 ppb990.520 ppb - 1.57 ppb
20130.868 ppb440.550 ppb - 1.28 ppb
20141.18 ppb10100.570 ppb - 2.99 ppb
20150.905 ppb1513ND - 1.80 ppb
20160.857 ppb1413ND - 1.62 ppb
20170.651 ppb1511ND - 1.40 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
2012-01-051.57 ppb
2012-04-241.03 ppb
2012-10-091.42 ppb
2012-10-091.26 ppb
2012-10-090.580 ppb
2012-10-090.520 ppb
2012-10-090.890 ppb
2012-10-090.550 ppb
2012-10-090.780 ppb
2013-10-230.550 ppb
2013-10-230.930 ppb
2013-10-230.710 ppb
2013-10-231.28 ppb
2014-05-140.780 ppb
2014-08-071.30 ppb
2014-11-240.720 ppb
2014-11-240.670 ppb
2014-11-240.640 ppb
2014-11-241.07 ppb
2014-11-240.570 ppb
2014-11-242.99 ppb
2014-11-241.96 ppb
2014-11-241.14 ppb
2015-01-140.810 ppb
2015-08-191.80 ppb
2015-08-191.21 ppb
2015-08-190.840 ppb
2015-08-191.10 ppb
2015-11-241.09 ppb
2015-11-240.800 ppb
2015-11-241.08 ppb
2015-11-240.610 ppb
2015-11-240.960 ppb
2015-11-24ND
2015-11-241.06 ppb
2015-11-241.36 ppb
2015-11-240.860 ppb
2015-12-14ND
2016-08-171.05 ppb
2016-08-170.650 ppb
2016-08-170.550 ppb
2016-08-171.12 ppb
2016-10-051.10 ppb
2016-10-050.530 ppb
2016-10-050.620 ppb
2016-10-05ND
2016-10-050.830 ppb
2016-10-051.21 ppb
2016-10-051.40 ppb
2016-10-050.700 ppb
2016-10-050.620 ppb
2016-11-211.62 ppb
2017-01-241.05 ppb
2017-08-160.730 ppb
2017-08-160.550 ppb
2017-08-160.560 ppb
2017-08-161.19 ppb
2017-12-071.10 ppb
2017-12-070.670 ppb
2017-12-070.520 ppb
2017-12-07ND
2017-12-070.800 ppb
2017-12-07ND
2017-12-07ND
2017-12-071.19 ppb
2017-12-07ND
2017-12-071.40 ppb