Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Chloroform

Jackson 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

 

488

Samples

0

Samples exceeding legal limit (MCL)

67

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.137 ppb255ND - 0.918 ppb
20150.121 ppb12615ND - 3.00 ppb
20160.0265 ppb221ND - 0.583 ppb
20170.0246 ppb241ND - 0.590 ppb
20180.146 ppb13015ND - 2.60 ppb
20190.180 ppb16131ND - 1.90 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
2014-01-09ND
2014-02-05ND
2014-02-07ND
2014-03-06ND
2014-03-060.526 ppb
2014-04-01ND
2014-04-02ND
2014-05-06ND
2014-05-060.771 ppb
2014-06-04ND
2014-06-040.690 ppb
2014-07-01ND
2014-07-010.918 ppb
2014-08-18ND
2014-08-19ND
2014-09-04ND
2014-09-05ND
2014-10-02ND
2014-10-060.522 ppb
2014-10-06ND
2014-11-03ND
2014-11-05ND
2014-11-07ND
2014-12-03ND
2014-12-03ND
2015-01-06ND
2015-01-06ND
2015-01-06ND
2015-01-06ND
2015-01-06ND
2015-01-06ND
2015-01-06ND
2015-01-060.001000 ppb
2015-01-061.000 ppb
2015-01-06ND
2015-01-06ND
2015-02-03ND
2015-02-031.55 ppb
2015-02-04ND
2015-02-04ND
2015-02-05ND
2015-02-05ND
2015-02-05ND
2015-02-05ND
2015-02-05ND
2015-02-05ND
2015-02-06ND
2015-02-060.604 ppb
2015-02-06ND
2015-03-04ND
2015-03-04ND
2015-03-09ND
2015-03-09ND
2015-03-09ND
2015-03-09ND
2015-04-06ND
2015-04-06ND
2015-04-06ND
2015-04-06ND
2015-04-06ND
2015-04-07ND
2015-04-07ND
2015-04-07ND
2015-04-07ND
2015-04-07ND
2015-04-07ND
2015-04-073.00 ppb
2015-04-07ND
2015-04-080.742 ppb
2015-04-08ND
2015-04-08ND
2015-05-05ND
2015-05-05ND
2015-05-05ND
2015-05-05ND
2015-05-05ND
2015-05-050.982 ppb
2015-06-08ND
2015-06-08ND
2015-06-08ND
2015-06-08ND
2015-06-100.508 ppb
2015-06-101.33 ppb
2015-07-07ND
2015-07-07ND
2015-07-07ND
2015-07-07ND
2015-07-08ND
2015-07-08ND
2015-07-08ND
2015-07-082.47 ppb
2015-07-090.538 ppb
2015-07-09ND
2015-07-09ND
2015-07-09ND
2015-07-09ND
2015-07-09ND
2015-07-09ND
2015-07-09ND
2015-08-03ND
2015-08-03ND
2015-08-03ND
2015-08-03ND
2015-08-03ND
2015-08-03ND
2015-08-03ND
2015-08-03ND
2015-08-04ND
2015-08-04ND
2015-08-04ND
2015-08-12ND
2015-08-12ND
2015-08-12ND
2015-08-12ND
2015-09-01ND
2015-09-01ND
2015-09-01ND
2015-09-01ND
2015-09-01ND
2015-09-010.706 ppb
2015-10-05ND
2015-10-05ND
2015-10-05ND
2015-10-05ND
2015-10-06ND
2015-10-06ND
2015-10-060.573 ppb
2015-10-06ND
2015-10-080.557 ppb
2015-10-08ND
2015-10-08ND
2015-10-08ND
2015-10-08ND
2015-10-08ND
2015-10-08ND
2015-10-08ND
2015-10-08ND
2015-10-08ND
2015-10-08ND
2015-11-02ND
2015-11-02ND
2015-11-02ND
2015-11-02ND
2015-11-02ND
2015-11-02ND
2015-12-03ND
2015-12-03ND
2015-12-03ND
2015-12-03ND
2015-12-03ND
2015-12-030.695 ppb
2016-01-07ND
2016-01-07ND
2016-02-02ND
2016-02-02ND
2016-03-01ND
2016-03-01ND
2016-04-06ND
2016-04-07ND
2016-05-04ND
2016-05-05ND
2016-06-07ND
2016-06-09ND
2016-07-05ND
2016-07-05ND
2016-08-02ND
2016-08-02ND
2016-09-060.583 ppb
2016-09-09ND
2016-10-04ND
2016-11-02ND
2016-11-03ND
2016-12-05ND
2017-01-04ND
2017-01-05ND
2017-01-10ND
2017-02-01ND
2017-02-01ND
2017-03-07ND
2017-03-07ND
2017-04-06ND
2017-04-07ND
2017-05-09ND
2017-05-09ND
2017-06-08ND
2017-06-14ND
2017-07-05ND
2017-07-12ND
2017-08-01ND
2017-08-09ND
2017-09-140.590 ppb
2017-09-26ND
2017-10-17ND
2017-10-18ND
2017-11-10ND
2017-12-05ND
2017-12-12ND
2018-01-030.580 ppb
2018-01-04ND
2018-01-04ND
2018-01-09ND
2018-01-09ND
2018-01-09ND
2018-01-09ND
2018-01-09ND
2018-01-09ND
2018-01-09ND
2018-01-09ND
2018-01-09ND
2018-01-10ND
2018-01-10ND
2018-01-10ND
2018-01-10ND
2018-01-101.80 ppb
2018-01-10ND
2018-01-10ND
2018-01-10ND
2018-01-102.50 ppb
2018-01-10ND
2018-01-251.10 ppb
2018-02-05ND
2018-02-05ND
2018-02-05ND
2018-02-05ND
2018-02-06ND
2018-02-060.500 ppb
2018-02-06ND
2018-02-07ND
2018-02-07ND
2018-02-07ND
2018-02-071.10 ppb
2018-02-070.700 ppb
2018-02-071.000 ppb
2018-03-06ND
2018-03-06ND
2018-03-06ND
2018-03-07ND
2018-03-07ND
2018-03-07ND
2018-03-07ND
2018-03-07ND
2018-03-07ND
2018-03-07ND
2018-03-071.30 ppb
2018-03-07ND
2018-03-07ND
2018-04-03ND
2018-04-03ND
2018-04-03ND
2018-04-03ND
2018-04-03ND
2018-04-03ND
2018-04-03ND
2018-04-04ND
2018-04-04ND
2018-04-04ND
2018-04-04ND
2018-04-04ND
2018-04-04ND
2018-04-041.40 ppb
2018-04-112.60 ppb
2018-04-11ND
2018-04-11ND
2018-04-130.500 ppb
2018-05-02ND
2018-06-06ND
2018-06-07ND
2018-07-11ND
2018-07-11ND
2018-07-11ND
2018-07-11ND
2018-07-12ND
2018-08-07ND
2018-08-07ND
2018-08-08ND
2018-08-08ND
2018-08-08ND
2018-08-08ND
2018-08-08ND
2018-08-08ND
2018-08-08ND
2018-08-08ND
2018-08-08ND
2018-08-08ND
2018-08-08ND
2018-08-081.50 ppb
2018-08-09ND
2018-08-09ND
2018-08-21ND
2018-08-21ND
2018-08-21ND
2018-08-22ND
2018-09-11ND
2018-09-11ND
2018-09-12ND
2018-09-12ND
2018-09-12ND
2018-09-12ND
2018-09-12ND
2018-09-20ND
2018-10-02ND
2018-10-02ND
2018-10-02ND
2018-10-02ND
2018-10-02ND
2018-10-02ND
2018-10-03ND
2018-10-131.90 ppb
2018-10-16ND
2018-10-16ND
2018-10-16ND
2018-10-160.500 ppb
2018-11-13ND
2018-11-13ND
2018-11-13ND
2018-11-13ND
2018-11-14ND
2018-11-14ND
2018-11-14ND
2018-11-14ND
2018-12-05ND
2018-12-05ND
2018-12-05ND
2018-12-05ND
2018-12-05ND
2018-12-05ND
2018-12-06ND
2019-01-08ND
2019-01-08ND
2019-01-08ND
2019-01-08ND
2019-01-08ND
2019-01-08ND
2019-01-08ND
2019-01-080.500 ppb
2019-01-08ND
2019-01-08ND
2019-01-08ND
2019-01-08ND
2019-01-09ND
2019-01-09ND
2019-01-091.70 ppb
2019-01-09ND
2019-01-09ND
2019-02-04ND
2019-02-04ND
2019-02-04ND
2019-02-041.10 ppb
2019-02-04ND
2019-02-04ND
2019-02-041.90 ppb
2019-02-04ND
2019-02-05ND
2019-02-05ND
2019-02-050.800 ppb
2019-02-050.700 ppb
2019-02-05ND
2019-02-05ND
2019-02-050.500 ppb
2019-02-050.800 ppb
2019-02-05ND
2019-02-06ND
2019-02-07ND
2019-02-07ND
2019-02-07ND
2019-02-07ND
2019-03-11ND
2019-03-11ND
2019-03-11ND
2019-03-111.50 ppb
2019-03-11ND
2019-03-110.900 ppb
2019-03-11ND
2019-03-11ND
2019-03-12ND
2019-03-120.500 ppb
2019-03-12ND
2019-03-12ND
2019-03-120.500 ppb
2019-03-12ND
2019-03-12ND
2019-03-120.800 ppb
2019-03-12ND
2019-03-13ND
2019-03-13ND
2019-03-13ND
2019-03-13ND
2019-03-13ND
2019-04-08ND
2019-04-08ND
2019-04-081.20 ppb
2019-04-08ND
2019-04-08ND
2019-04-081.80 ppb
2019-04-08ND
2019-04-08ND
2019-04-09ND
2019-04-09ND
2019-04-09ND
2019-04-09ND
2019-04-091.20 ppb
2019-04-09ND
2019-04-090.700 ppb
2019-04-09ND
2019-04-090.800 ppb
2019-04-10ND
2019-04-11ND
2019-04-11ND
2019-04-11ND
2019-04-11ND
2019-05-07ND
2019-05-070.500 ppb
2019-05-08ND
2019-05-08ND
2019-05-08ND
2019-05-08ND
2019-05-08ND
2019-06-050.500 ppb
2019-06-05ND
2019-06-06ND
2019-06-06ND
2019-06-06ND
2019-06-06ND
2019-06-06ND
2019-07-11ND
2019-07-11ND
2019-07-11ND
2019-07-11ND
2019-07-15ND
2019-07-15ND
2019-07-151.10 ppb
2019-07-15ND
2019-07-150.500 ppb
2019-07-15ND
2019-07-15ND
2019-07-151.80 ppb
2019-07-160.600 ppb
2019-07-16ND
2019-07-16ND
2019-07-16ND
2019-08-05ND
2019-08-05ND
2019-08-06ND
2019-08-07ND
2019-08-07ND
2019-08-07ND
2019-08-07ND
2019-08-07ND
2019-08-07ND
2019-08-07ND
2019-08-07ND
2019-08-07ND
2019-08-07ND
2019-08-07ND
2019-08-07ND
2019-09-09ND
2019-09-090.700 ppb
2019-09-10ND
2019-09-10ND
2019-09-10ND
2019-09-10ND
2019-09-10ND
2019-09-10ND
2019-10-09ND
2019-10-09ND
2019-10-09ND
2019-10-09ND
2019-10-141.80 ppb
2019-10-14ND
2019-10-14ND
2019-10-140.700 ppb
2019-10-14ND
2019-10-14ND
2019-10-140.500 ppb
2019-10-140.900 ppb
2019-10-15ND
2019-10-150.800 ppb
2019-10-15ND
2019-10-150.600 ppb
2019-11-11ND
2019-11-11ND
2019-11-12ND
2019-11-15ND
2019-11-15ND
2019-11-15ND
2019-11-15ND
2019-12-03ND
2019-12-04ND