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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

City of Bay City

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

 

130

Samples

0

Samples exceeding legal limit (MCL)

5

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.0353 ppb171ND - 0.600 ppb
20150.329 ppb213ND - 3.20 ppb
2016ND250ND
2017ND210ND
20180.0714 ppb211ND - 1.50 ppb
2019ND250ND

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
2014-02-19AC435900.600 ppb
2014-02-19AC43572ND
2014-02-19AC43575ND
2014-02-19AC43573ND
2014-02-19AC43574ND
2014-04-24AC51696ND
2014-04-24AC51709ND
2014-04-24AC51694ND
2014-04-24AC51695ND
2014-08-20AC64723ND
2014-08-20AC64720ND
2014-08-20AC64722ND
2014-08-20AC64719ND
2014-10-24AC70563ND
2014-10-24AC70562ND
2014-10-24AC70600ND
2014-10-24AC70559ND
2015-01-29AC78511ND
2015-01-29AC78521ND
2015-01-29AC78519ND
2015-01-29AC78515ND
2015-01-29AC78531ND
2015-01-29AC78470ND
2015-01-29AC78446ND
2015-01-29AC78445ND
2015-01-29AC78448ND
2015-05-18AC923022.70 ppb
2015-05-18AC92280ND
2015-05-18AC92299ND
2015-05-18AC92301ND
2015-08-14AD042911.000 ppb
2015-08-14AD04256ND
2015-08-14AD04245ND
2015-08-14AD04316ND
2015-12-02AD151243.20 ppb
2015-12-02AD15127ND
2015-12-02AD15137ND
2015-12-02AD15133ND
2016-02-25AD25767ND
2016-02-25AD25759ND
2016-02-25AD25753ND
2016-02-25AD25763ND
2016-02-25AD25700ND
2016-02-25AD25702ND
2016-02-25AD25701ND
2016-02-25AD25703ND
2016-03-21AD29571ND
2016-06-02AD39201ND
2016-06-02AD39125ND
2016-06-02AD39128ND
2016-06-02AD39126ND
2016-06-02AD39127ND
2016-07-21AD45233ND
2016-09-19AD50004ND
2016-09-19AD49984ND
2016-09-19AD50008ND
2016-09-19AD49987ND
2016-09-19AD50155ND
2016-11-16AD58254ND
2016-11-16AD58257ND
2016-11-16AD58258ND
2016-11-16AD58255ND
2016-11-16AD58355ND
2017-01-25AD66852ND
2017-01-25AD66846ND
2017-01-25AD66781ND
2017-01-25AD66766ND
2017-01-25AD66767ND
2017-01-25AD66779ND
2017-03-06AD73479ND
2017-03-06AD73461ND
2017-03-06AD73481ND
2017-05-23AD85215ND
2017-05-23AD85212ND
2017-05-23AD85211ND
2017-05-23AD85214ND
2017-08-08AD92379ND
2017-08-08AD92375ND
2017-08-08AD92377ND
2017-08-08AD92378ND
2017-10-23AE01581ND
2017-10-23AE01583ND
2017-10-23AE01584ND
2017-10-23AE01582ND
2018-01-09AE08373ND
2018-01-09AE08407ND
2018-01-09AE08375ND
2018-01-09AE08379ND
2018-01-09AE08359ND
2018-01-09AE08326ND
2018-01-09AE08309ND
2018-01-09AE08318ND
2018-01-09AE08328ND
2018-04-05AE21427ND
2018-04-05AE21425ND
2018-04-05AE21420ND
2018-04-05AE21421ND
2018-07-18AE337271.50 ppb
2018-07-18AE33755ND
2018-07-18AE33726ND
2018-07-18AE33748ND
2018-10-09AE42919ND
2018-10-09AE42920ND
2018-10-09AE42921ND
2018-10-09AE42922ND
2019-02-07AE53496ND
2019-02-07AE53488ND
2019-02-07AE53498ND
2019-02-07AE53492ND
2019-02-07AE53490ND
2019-02-07AE53411ND
2019-02-07AE53410ND
2019-02-07AE53413ND
2019-02-07AE53409ND
2019-04-29AE63918ND
2019-04-29AE63913ND
2019-04-29AE63935ND
2019-04-29AE63934ND
2019-04-29AE63951ND
2019-04-29AE63953ND
2019-08-06AE77185ND
2019-08-06AE77213ND
2019-08-06AE77186ND
2019-08-06AE77215ND
2019-08-06AE77279ND
2019-08-06AE77273ND
2019-10-17AE86901ND
2019-10-17AE86917ND
2019-10-17AE86894ND
2019-10-17AE86900ND