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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

City of Roma

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

 

102

Samples

0

Samples exceeding legal limit (MCL)

42

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20141.41 ppb1711ND - 4.60 ppb
20150.571 ppb176ND - 2.50 ppb
20160.329 ppb174ND - 1.90 ppb
20170.647 ppb174ND - 6.30 ppb
20180.841 ppb177ND - 3.30 ppb
20191.56 ppb1710ND - 4.20 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
2014-02-26AC447321.60 ppb
2014-02-26AC447302.50 ppb
2014-02-26AC446992.00 ppb
2014-02-26AC44703ND
2014-06-10AC564591.000 ppb
2014-06-10AC56451ND
2014-06-10AC56453ND
2014-06-10AC56432ND
2014-08-18AC63943ND
2014-08-18AC641474.60 ppb
2014-08-18AC641621.80 ppb
2014-08-18AC641632.10 ppb
2014-08-18AC641604.10 ppb
2014-12-03AC735581.50 ppb
2014-12-03AC73555ND
2014-12-03AC735531.30 ppb
2014-12-03AC735271.40 ppb
2015-02-11AC80180ND
2015-02-11AC80183ND
2015-02-11AC80181ND
2015-02-11AC80203ND
2015-06-08AC94851ND
2015-06-08AC948611.80 ppb
2015-06-08AC948501.10 ppb
2015-06-08AC94870ND
2015-09-24AD08494ND
2015-09-24AD084601.20 ppb
2015-09-24AD084611.40 ppb
2015-09-24AD084641.70 ppb
2015-09-24AD084632.50 ppb
2015-11-05AD12768ND
2015-11-05AD12767ND
2015-11-05AD12764ND
2015-11-05AD12759ND
2016-02-25AD25728ND
2016-02-25AD25695ND
2016-02-25AD25727ND
2016-02-25AD25681ND
2016-05-12AD36588ND
2016-05-12AD365891.30 ppb
2016-05-12AD36595ND
2016-05-12AD365851.20 ppb
2016-09-20AD50389ND
2016-09-20AD503481.20 ppb
2016-09-20AD50352ND
2016-09-20AD50350ND
2016-09-20AD503511.90 ppb
2016-10-27AD55114ND
2016-10-27AD55115ND
2016-10-27AD55094ND
2016-10-27AD55095ND
2017-03-10AD74635ND
2017-03-10AD74640ND
2017-03-10AD74643ND
2017-03-10AD74637ND
2017-04-27AD81456ND
2017-04-27AD81460ND
2017-04-27AD81453ND
2017-04-27AD814611.10 ppb
2017-08-03AD92172ND
2017-08-03AD92133ND
2017-08-03AD92125ND
2017-08-03AD92141ND
2017-08-03AD92131ND
2017-11-09AE043151.60 ppb
2017-11-09AE043132.00 ppb
2017-11-09AE04310ND
2017-11-09AE043126.30 ppb
2018-03-09AE178222.10 ppb
2018-03-09AE178192.10 ppb
2018-03-09AE178232.30 ppb
2018-03-09AE178132.10 ppb
2018-05-17AE26764ND
2018-05-17AE267361.30 ppb
2018-05-17AE267591.10 ppb
2018-05-17AE26760ND
2018-08-30AE38958ND
2018-08-30AE38919ND
2018-08-30AE38914ND
2018-08-30AE38917ND
2018-08-30AE38922ND
2018-12-03AE47766ND
2018-12-03AE477513.30 ppb
2018-12-03AE47760ND
2018-12-03AE47762ND
2019-02-07AE53426ND
2019-02-07AE53436ND
2019-02-07AE53419ND
2019-02-07AE53427ND
2019-06-10AE69984ND
2019-06-10AE69967ND
2019-06-10AE699701.60 ppb
2019-06-10AE69969ND
2019-09-13AE836443.80 ppb
2019-09-13AE835313.90 ppb
2019-09-13AE835244.00 ppb
2019-09-13AE835264.20 ppb
2019-09-13AE835282.90 ppb
2019-12-06AE918631.40 ppb
2019-12-06AE918611.50 ppb
2019-12-06AE918641.30 ppb
2019-12-06AE918671.90 ppb