Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Chloroform

Clinton 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.

MORE ABOUT THIS CONTAMINANT

 

152

Samples

0

Samples exceeding legal limit (MCL)

89

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.600 ppb2916ND - 2.86 ppb
20150.990 ppb2117ND - 1.95 ppb
20161.25 ppb2117ND - 3.20 ppb
20170.769 ppb3225ND - 2.70 ppb
20180.836 ppb2520ND - 2.70 ppb
20191.76 ppb2420ND - 6.60 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
2014-03-06L4954608-4ND
2014-03-06L4954608-2ND
2014-03-06L4954608-1ND
2014-03-06L4954608-3ND
2014-03-06L4860892-2ND
2014-04-10L4974293-20.0300 ppb
2014-04-24L4974287-30.230 ppb
2014-04-24L4974287-20.120 ppb
2014-04-24L4974287-70.270 ppb
2014-04-24L4974286-10.0700 ppb
2014-06-05L5057457-41.01 ppb
2014-06-05L5057457-2ND
2014-06-05L5057457-1ND
2014-06-05L5057457-3ND
2014-06-26L3999573-51.68 ppb
2014-06-26L3999573-1ND
2014-07-17L5104770-2ND
2014-08-08L3595937-1ND
2014-08-08L3595937-5ND
2014-09-04L5203896-41.79 ppb
2014-09-04L5203896-21.99 ppb
2014-09-04L5203896-12.86 ppb
2014-09-04L5203896-32.01 ppb
2014-10-15L5241379-2ND
2014-12-04L5321780-41.05 ppb
2014-12-04L5321780-21.20 ppb
2014-12-04L5321780-11.03 ppb
2014-12-04L5321780-31.72 ppb
2014-12-18L5365933-10.340 ppb
2015-01-30L5357605-2ND
2015-03-03L5451334-41.02 ppb
2015-03-03L5451334-20.930 ppb
2015-03-03L5451334-11.03 ppb
2015-03-03L5451334-31.66 ppb
2015-04-09L5490680-2ND
2015-06-05L5588297-40.980 ppb
2015-06-05L5588297-21.19 ppb
2015-06-05L5588297-11.67 ppb
2015-06-05L5588297-31.24 ppb
2015-06-25L5490684-1ND
2015-07-08L5640110-2ND
2015-09-04L5771061-41.57 ppb
2015-09-04L5771061-20.570 ppb
2015-09-04L5771061-11.04 ppb
2015-09-04L5771061-30.860 ppb
2015-10-08L5809030-20.130 ppb
2015-12-04L5915233-41.50 ppb
2015-12-04L5915233-21.51 ppb
2015-12-04L5915233-11.94 ppb
2015-12-04L5915233-31.95 ppb
2016-01-05L5969345-2ND
2016-03-03L6074653-40.900 ppb
2016-03-03L6074653-20.600 ppb
2016-03-03L6074653-10.900 ppb
2016-03-03L6074653-31.70 ppb
2016-04-07L6131558-2ND
2016-05-27L6131554-10.1000 ppb
2016-06-06L6254909-41.10 ppb
2016-06-06L6254909-21.70 ppb
2016-06-06L6254909-11.40 ppb
2016-06-06L6254909-32.20 ppb
2016-07-28L6317571-2ND
2016-09-02L6426354-41.50 ppb
2016-09-02L6426354-21.90 ppb
2016-09-02L6426354-13.20 ppb
2016-09-02L6426354-32.20 ppb
2016-10-06L6468952-2ND
2016-12-01L6552483-41.30 ppb
2016-12-01L6552483-21.70 ppb
2016-12-01L6552483-11.70 ppb
2016-12-01L6552483-32.10 ppb
2017-01-05L6599908-2ND
2017-03-01L6674387-10.200 ppb
2017-03-02L6681502-41.000 ppb
2017-03-02L6681502-20.800 ppb
2017-03-02L6681502-10.600 ppb
2017-03-02L6681502-30.900 ppb
2017-04-06L6722844-2ND
2017-06-01L6807953-41.30 ppb
2017-06-01L6807953-22.60 ppb
2017-06-01L6807953-11.20 ppb
2017-06-01L6807953-32.70 ppb
2017-06-14L6799987-10.200 ppb
2017-06-20L6722847-6ND
2017-06-28L6722851-30.300 ppb
2017-07-20L6857745-2ND
2017-08-29L6943960-1ND
2017-08-29L6943961-10.300 ppb
2017-08-29L6939418-10.1000 ppb
2017-09-01L6938388-40.900 ppb
2017-09-01L6938388-21.50 ppb
2017-09-01L6938388-11.30 ppb
2017-09-01L6938388-31.40 ppb
2017-10-05L6951684-2ND
2017-11-14L6970556-30.300 ppb
2017-11-15L6972577-3ND
2017-11-15L6972578-30.1000 ppb
2017-11-16L6950362-10.300 ppb
2017-12-05L6971661-41.000 ppb
2017-12-05L6971661-22.30 ppb
2017-12-05L6971661-11.000 ppb
2017-12-05L6971661-32.00 ppb
2017-12-12L6972413-10.300 ppb
2018-01-11L6983399-2ND
2018-02-268024443-01ND
2018-03-05L7000626-40.900 ppb
2018-03-05L7000626-20.500 ppb
2018-03-05L7000626-10.700 ppb
2018-03-05L7000626-30.400 ppb
2018-04-05L7009645-2ND
2018-05-21L7009649-10.1000 ppb
2018-06-04L7026542-41.30 ppb
2018-06-04L7026542-20.800 ppb
2018-06-04L7026542-11.70 ppb
2018-06-04L7026542-30.900 ppb
2018-06-04L7027496-10.200 ppb
2018-07-05L7041219-2ND
2018-09-05L7062797-41.70 ppb
2018-09-05L7062797-21.000 ppb
2018-09-05L7062797-12.20 ppb
2018-09-05L7062797-30.800 ppb
2018-09-25L7063659-10.400 ppb
2018-10-05L7071836-2ND
2018-12-05L7084966-41.10 ppb
2018-12-05L7084966-22.70 ppb
2018-12-05L7084966-11.50 ppb
2018-12-05L7084966-31.70 ppb
2018-12-05L7085584-10.300 ppb
2019-01-10L7090652-2ND
2019-03-05L7104994-10.200 ppb
2019-03-07L7104402-41.40 ppb
2019-03-07L7104402-22.70 ppb
2019-03-07L7104402-11.10 ppb
2019-03-07L7104402-32.00 ppb
2019-06-06L7124611-42.20 ppb
2019-06-06L7124611-26.60 ppb
2019-06-06L7124611-13.30 ppb
2019-06-06L7124611-36.60 ppb
2019-06-06L7111576-2ND
2019-06-11L7125440-10.200 ppb
2019-06-19L7111574-10.1000 ppb
2019-09-26L7153721-41.80 ppb
2019-09-26L7153721-21.30 ppb
2019-09-26L7153721-12.40 ppb
2019-09-26L7153721-31.000 ppb
2019-09-26L7134453-2ND
2019-12-06L7173104-41.70 ppb
2019-12-06L7173104-24.10 ppb
2019-12-06L7173104-11.30 ppb
2019-12-06L7173104-32.10 ppb
2019-12-06L7160155-2ND
2019-12-12L7173219-10.200 ppb