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.
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2013 | N/A | 0 | 0 | N/A |
2014 | 0.600 ppb | 29 | 16 | ND - 2.86 ppb |
2015 | 0.990 ppb | 21 | 17 | ND - 1.95 ppb |
2016 | 1.25 ppb | 21 | 17 | ND - 3.20 ppb |
2017 | 0.769 ppb | 32 | 25 | ND - 2.70 ppb |
2018 | 0.836 ppb | 25 | 20 | ND - 2.70 ppb |
2019 | 1.76 ppb | 24 | 20 | ND - 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 |
---|---|---|
2014-03-06 | L4954608-4 | ND |
2014-03-06 | L4954608-2 | ND |
2014-03-06 | L4954608-1 | ND |
2014-03-06 | L4954608-3 | ND |
2014-03-06 | L4860892-2 | ND |
2014-04-10 | L4974293-2 | 0.0300 ppb |
2014-04-24 | L4974287-3 | 0.230 ppb |
2014-04-24 | L4974287-2 | 0.120 ppb |
2014-04-24 | L4974287-7 | 0.270 ppb |
2014-04-24 | L4974286-1 | 0.0700 ppb |
2014-06-05 | L5057457-4 | 1.01 ppb |
2014-06-05 | L5057457-2 | ND |
2014-06-05 | L5057457-1 | ND |
2014-06-05 | L5057457-3 | ND |
2014-06-26 | L3999573-5 | 1.68 ppb |
2014-06-26 | L3999573-1 | ND |
2014-07-17 | L5104770-2 | ND |
2014-08-08 | L3595937-1 | ND |
2014-08-08 | L3595937-5 | ND |
2014-09-04 | L5203896-4 | 1.79 ppb |
2014-09-04 | L5203896-2 | 1.99 ppb |
2014-09-04 | L5203896-1 | 2.86 ppb |
2014-09-04 | L5203896-3 | 2.01 ppb |
2014-10-15 | L5241379-2 | ND |
2014-12-04 | L5321780-4 | 1.05 ppb |
2014-12-04 | L5321780-2 | 1.20 ppb |
2014-12-04 | L5321780-1 | 1.03 ppb |
2014-12-04 | L5321780-3 | 1.72 ppb |
2014-12-18 | L5365933-1 | 0.340 ppb |
2015-01-30 | L5357605-2 | ND |
2015-03-03 | L5451334-4 | 1.02 ppb |
2015-03-03 | L5451334-2 | 0.930 ppb |
2015-03-03 | L5451334-1 | 1.03 ppb |
2015-03-03 | L5451334-3 | 1.66 ppb |
2015-04-09 | L5490680-2 | ND |
2015-06-05 | L5588297-4 | 0.980 ppb |
2015-06-05 | L5588297-2 | 1.19 ppb |
2015-06-05 | L5588297-1 | 1.67 ppb |
2015-06-05 | L5588297-3 | 1.24 ppb |
2015-06-25 | L5490684-1 | ND |
2015-07-08 | L5640110-2 | ND |
2015-09-04 | L5771061-4 | 1.57 ppb |
2015-09-04 | L5771061-2 | 0.570 ppb |
2015-09-04 | L5771061-1 | 1.04 ppb |
2015-09-04 | L5771061-3 | 0.860 ppb |
2015-10-08 | L5809030-2 | 0.130 ppb |
2015-12-04 | L5915233-4 | 1.50 ppb |
2015-12-04 | L5915233-2 | 1.51 ppb |
2015-12-04 | L5915233-1 | 1.94 ppb |
2015-12-04 | L5915233-3 | 1.95 ppb |
2016-01-05 | L5969345-2 | ND |
2016-03-03 | L6074653-4 | 0.900 ppb |
2016-03-03 | L6074653-2 | 0.600 ppb |
2016-03-03 | L6074653-1 | 0.900 ppb |
2016-03-03 | L6074653-3 | 1.70 ppb |
2016-04-07 | L6131558-2 | ND |
2016-05-27 | L6131554-1 | 0.1000 ppb |
2016-06-06 | L6254909-4 | 1.10 ppb |
2016-06-06 | L6254909-2 | 1.70 ppb |
2016-06-06 | L6254909-1 | 1.40 ppb |
2016-06-06 | L6254909-3 | 2.20 ppb |
2016-07-28 | L6317571-2 | ND |
2016-09-02 | L6426354-4 | 1.50 ppb |
2016-09-02 | L6426354-2 | 1.90 ppb |
2016-09-02 | L6426354-1 | 3.20 ppb |
2016-09-02 | L6426354-3 | 2.20 ppb |
2016-10-06 | L6468952-2 | ND |
2016-12-01 | L6552483-4 | 1.30 ppb |
2016-12-01 | L6552483-2 | 1.70 ppb |
2016-12-01 | L6552483-1 | 1.70 ppb |
2016-12-01 | L6552483-3 | 2.10 ppb |
2017-01-05 | L6599908-2 | ND |
2017-03-01 | L6674387-1 | 0.200 ppb |
2017-03-02 | L6681502-4 | 1.000 ppb |
2017-03-02 | L6681502-2 | 0.800 ppb |
2017-03-02 | L6681502-1 | 0.600 ppb |
2017-03-02 | L6681502-3 | 0.900 ppb |
2017-04-06 | L6722844-2 | ND |
2017-06-01 | L6807953-4 | 1.30 ppb |
2017-06-01 | L6807953-2 | 2.60 ppb |
2017-06-01 | L6807953-1 | 1.20 ppb |
2017-06-01 | L6807953-3 | 2.70 ppb |
2017-06-14 | L6799987-1 | 0.200 ppb |
2017-06-20 | L6722847-6 | ND |
2017-06-28 | L6722851-3 | 0.300 ppb |
2017-07-20 | L6857745-2 | ND |
2017-08-29 | L6943960-1 | ND |
2017-08-29 | L6943961-1 | 0.300 ppb |
2017-08-29 | L6939418-1 | 0.1000 ppb |
2017-09-01 | L6938388-4 | 0.900 ppb |
2017-09-01 | L6938388-2 | 1.50 ppb |
2017-09-01 | L6938388-1 | 1.30 ppb |
2017-09-01 | L6938388-3 | 1.40 ppb |
2017-10-05 | L6951684-2 | ND |
2017-11-14 | L6970556-3 | 0.300 ppb |
2017-11-15 | L6972577-3 | ND |
2017-11-15 | L6972578-3 | 0.1000 ppb |
2017-11-16 | L6950362-1 | 0.300 ppb |
2017-12-05 | L6971661-4 | 1.000 ppb |
2017-12-05 | L6971661-2 | 2.30 ppb |
2017-12-05 | L6971661-1 | 1.000 ppb |
2017-12-05 | L6971661-3 | 2.00 ppb |
2017-12-12 | L6972413-1 | 0.300 ppb |
2018-01-11 | L6983399-2 | ND |
2018-02-26 | 8024443-01 | ND |
2018-03-05 | L7000626-4 | 0.900 ppb |
2018-03-05 | L7000626-2 | 0.500 ppb |
2018-03-05 | L7000626-1 | 0.700 ppb |
2018-03-05 | L7000626-3 | 0.400 ppb |
2018-04-05 | L7009645-2 | ND |
2018-05-21 | L7009649-1 | 0.1000 ppb |
2018-06-04 | L7026542-4 | 1.30 ppb |
2018-06-04 | L7026542-2 | 0.800 ppb |
2018-06-04 | L7026542-1 | 1.70 ppb |
2018-06-04 | L7026542-3 | 0.900 ppb |
2018-06-04 | L7027496-1 | 0.200 ppb |
2018-07-05 | L7041219-2 | ND |
2018-09-05 | L7062797-4 | 1.70 ppb |
2018-09-05 | L7062797-2 | 1.000 ppb |
2018-09-05 | L7062797-1 | 2.20 ppb |
2018-09-05 | L7062797-3 | 0.800 ppb |
2018-09-25 | L7063659-1 | 0.400 ppb |
2018-10-05 | L7071836-2 | ND |
2018-12-05 | L7084966-4 | 1.10 ppb |
2018-12-05 | L7084966-2 | 2.70 ppb |
2018-12-05 | L7084966-1 | 1.50 ppb |
2018-12-05 | L7084966-3 | 1.70 ppb |
2018-12-05 | L7085584-1 | 0.300 ppb |
2019-01-10 | L7090652-2 | ND |
2019-03-05 | L7104994-1 | 0.200 ppb |
2019-03-07 | L7104402-4 | 1.40 ppb |
2019-03-07 | L7104402-2 | 2.70 ppb |
2019-03-07 | L7104402-1 | 1.10 ppb |
2019-03-07 | L7104402-3 | 2.00 ppb |
2019-06-06 | L7124611-4 | 2.20 ppb |
2019-06-06 | L7124611-2 | 6.60 ppb |
2019-06-06 | L7124611-1 | 3.30 ppb |
2019-06-06 | L7124611-3 | 6.60 ppb |
2019-06-06 | L7111576-2 | ND |
2019-06-11 | L7125440-1 | 0.200 ppb |
2019-06-19 | L7111574-1 | 0.1000 ppb |
2019-09-26 | L7153721-4 | 1.80 ppb |
2019-09-26 | L7153721-2 | 1.30 ppb |
2019-09-26 | L7153721-1 | 2.40 ppb |
2019-09-26 | L7153721-3 | 1.000 ppb |
2019-09-26 | L7134453-2 | ND |
2019-12-06 | L7173104-4 | 1.70 ppb |
2019-12-06 | L7173104-2 | 4.10 ppb |
2019-12-06 | L7173104-1 | 1.30 ppb |
2019-12-06 | L7173104-3 | 2.10 ppb |
2019-12-06 | L7160155-2 | ND |
2019-12-12 | L7173219-1 | 0.200 ppb |