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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

City of Bastrop

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

 

108

Samples

0

Samples exceeding legal limit (MCL)

63

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20144.15 ppb139ND - 14.0 ppb
20152.57 ppb1910ND - 7.10 ppb
20161.87 ppb1910ND - 5.80 ppb
20171.55 ppb1911ND - 5.90 ppb
20181.50 ppb1912ND - 4.00 ppb
20191.63 ppb1911ND - 4.40 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 Lab ID Result
2014-02-18AC434443.40 ppb
2014-02-18AC434422.00 ppb
2014-02-18AC434480.800 ppb
2014-05-01AC527004.00 ppb
2014-05-01AC526955.90 ppb
2014-08-13AC635678.90 ppb
2014-08-13AC63566ND
2014-08-13AC63565ND
2014-08-13AC635635.50 ppb
2014-10-14AC69644ND
2014-10-14AC696429.50 ppb
2014-10-14AC6963814.0 ppb
2014-10-14AC69639ND
2015-02-02AC788152.80 ppb
2015-02-02AC788253.10 ppb
2015-02-02AC78807ND
2015-02-02AC786786.10 ppb
2015-02-02AC787083.70 ppb
2015-02-02AC78710ND
2015-02-02AC78713ND
2015-04-07AC874776.20 ppb
2015-04-07AC874704.60 ppb
2015-04-07AC87471ND
2015-04-07AC87481ND
2015-07-09AC989565.70 ppb
2015-07-09AC989576.00 ppb
2015-07-09AC98960ND
2015-07-09AC98959ND
2015-10-13AD104227.10 ppb
2015-10-13AD104263.60 ppb
2015-10-13AD10423ND
2015-10-13AD10424ND
2016-01-25AD197051.40 ppb
2016-01-25AD197071.10 ppb
2016-01-25AD19703ND
2016-01-25AD196663.60 ppb
2016-01-25AD196692.10 ppb
2016-01-25AD19668ND
2016-01-25AD19667ND
2016-04-26AD341854.50 ppb
2016-04-26AD341895.80 ppb
2016-04-26AD34190ND
2016-04-26AD34188ND
2016-07-26AD456503.50 ppb
2016-07-26AD456554.10 ppb
2016-07-26AD45647ND
2016-07-26AD45653ND
2016-10-18AD535494.50 ppb
2016-10-18AD535514.90 ppb
2016-10-18AD53545ND
2016-10-18AD53550ND
2017-01-10AD63984ND
2017-01-10AD639432.30 ppb
2017-01-10AD639652.20 ppb
2017-01-10AD63963ND
2017-01-10AD639441.000 ppb
2017-04-05AD785581.80 ppb
2017-04-05AD785601.000 ppb
2017-04-05AD785222.80 ppb
2017-04-05AD785272.60 ppb
2017-04-05AD78524ND
2017-04-05AD78525ND
2017-07-11AD888725.90 ppb
2017-07-11AD888714.80 ppb
2017-07-11AD88870ND
2017-07-11AD88869ND
2017-10-04AD992332.20 ppb
2017-10-04AD992412.80 ppb
2017-10-04AD99230ND
2017-10-04AD99237ND
2018-01-23AE098661.30 ppb
2018-01-23AE09862ND
2018-01-23AE09870ND
2018-01-23AE098191.50 ppb
2018-01-23AE098381.60 ppb
2018-01-23AE09834ND
2018-01-23AE09817ND
2018-04-11AE220271.90 ppb
2018-04-11AE220252.00 ppb
2018-04-11AE22026ND
2018-04-11AE22019ND
2018-08-13AE365541.90 ppb
2018-08-13AE365473.10 ppb
2018-08-13AE365531.60 ppb
2018-08-13AE365503.70 ppb
2018-10-16AE435844.00 ppb
2018-10-16AE435853.90 ppb
2018-10-16AE43586ND
2018-10-16AE435872.00 ppb
2019-01-16AE501542.80 ppb
2019-01-16AE501601.60 ppb
2019-01-16AE500534.00 ppb
2019-01-16AE500544.40 ppb
2019-01-16AE50055ND
2019-01-16AE500561.80 ppb
2019-04-11AE62106ND
2019-04-11AE620323.50 ppb
2019-04-11AE620353.60 ppb
2019-04-11AE62033ND
2019-04-11AE62034ND
2019-07-30AE763552.80 ppb
2019-07-30AE763562.70 ppb
2019-07-30AE76357ND
2019-07-30AE76354ND
2019-11-20AE899101.70 ppb
2019-11-20AE899082.00 ppb
2019-11-20AE89905ND
2019-11-20AE89906ND