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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Union Parish Waterworks District 1

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

 

78

Samples

0

Samples exceeding legal limit (MCL)

50

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND60ND
20152.95 ppb1612ND - 5.71 ppb
20164.64 ppb883.28 ppb - 5.38 ppb
20172.60 ppb1614ND - 4.10 ppb
20185.56 ppb1610ND - 32.8 ppb
20190.395 ppb168ND - 1.30 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
2014-02-10AD88999ND
2014-02-10AD88998ND
2014-02-10AD88999ND
2014-02-10AD88998ND
2014-07-15AD93579ND
2014-07-15AD93579ND
2015-02-1913739153.19 ppb
2015-02-1913739143.14 ppb
2015-02-1913739153.19 ppb
2015-02-1913739143.14 ppb
2015-04-281390506ND
2015-04-281390507ND
2015-04-281390507ND
2015-04-281390506ND
2015-05-2713979993.30 ppb
2015-05-2713980003.16 ppb
2015-05-2713980003.16 ppb
2015-05-2713979993.30 ppb
2015-08-1914204935.71 ppb
2015-08-1914204945.10 ppb
2015-08-1914204945.10 ppb
2015-08-1914204935.71 ppb
2016-04-1214818495.38 ppb
2016-04-1214818483.28 ppb
2016-04-1214818495.38 ppb
2016-04-1214818483.28 ppb
2016-09-2115265095.19 ppb
2016-09-2115265095.19 ppb
2016-09-2115265104.72 ppb
2016-09-2115265104.72 ppb
2017-02-02352928740153.10 ppb
2017-02-02352928740163.30 ppb
2017-02-02352928740153.10 ppb
2017-02-02352928740163.30 ppb
2017-05-16353126260073.70 ppb
2017-05-16353126260084.10 ppb
2017-05-16353126260073.70 ppb
2017-05-16353126260084.10 ppb
2017-08-10353298050123.40 ppb
2017-08-10353298050112.90 ppb
2017-08-10353298050112.90 ppb
2017-08-10353298050123.40 ppb
2017-11-27353507570020.270 ppb
2017-11-2735350757001ND
2017-11-2735350757001ND
2017-11-27353507570020.270 ppb
2018-02-20353757860012.70 ppb
2018-02-20353757860021.70 ppb
2018-02-20353757860012.70 ppb
2018-02-20353757860021.70 ppb
2018-05-23353945840013.70 ppb
2018-05-23353945840023.60 ppb
2018-05-23353945840013.70 ppb
2018-05-23353945840023.60 ppb
2018-08-143541162000232.8 ppb
2018-08-1435411620001ND
2018-08-143541162000232.8 ppb
2018-08-1435411620001ND
2018-11-1335431644002ND
2018-11-1335431644001ND
2018-11-1335431644001ND
2018-11-1335431644002ND
2019-02-1835449362002ND
2019-02-1835449362001ND
2019-02-1835449362001ND
2019-02-1835449362002ND
2019-05-1335469327002ND
2019-05-1335469327002ND
2019-05-1335469327001ND
2019-05-1335469327001ND
2019-08-14354912160020.990 ppb
2019-08-14354912160011.30 ppb
2019-08-14354912160011.30 ppb
2019-08-14354912160020.990 ppb
2019-11-18355140690010.430 ppb
2019-11-18355140690020.440 ppb
2019-11-18355140690010.430 ppb
2019-11-18355140690020.440 ppb