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EWG's Tap Water Database — 2019 UPDATE

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Chloroform

City of Sweetwater

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.

 

76

Samples

0

Samples exceeding legal limit (MCL)

10

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.400 ppb21ND - 0.800 ppb
2013ND60ND
20140.135 ppb172ND - 1.20 ppb
20150.0594 ppb171ND - 1.01 ppb
20160.368 ppb175ND - 1.33 ppb
20170.0606 ppb171ND - 1.03 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
2012-06-26AB93955ND
2012-09-18AC013120.800 ppb
2013-06-04Q1301833008ND
2013-09-23Q1308199002ND
2013-12-18Q1318501008ND
2013-12-18Q1318501007ND
2013-12-18Q1318501006ND
2013-12-18Q1318501005ND
2014-02-19Q1405568004ND
2014-02-19Q1405568001ND
2014-02-19Q1405568002ND
2014-02-19Q1405568003ND
2014-05-06Q1414727006ND
2014-05-06Q1414727005ND
2014-05-06Q1414727004ND
2014-05-06Q1414727003ND
2014-08-28Q14400930021.10 ppb
2014-08-28Q1440093005ND
2014-08-28Q1440093001ND
2014-08-28Q1440093003ND
2014-08-28Q1440093004ND
2014-11-24Q1457322004ND
2014-11-24Q1457322003ND
2014-11-24Q1457322002ND
2014-11-24Q14573220011.20 ppb
2015-02-11Q1505778006ND
2015-02-11Q1505778005ND
2015-02-11Q1505778007ND
2015-02-11Q1505778008ND
2015-06-17Q1522698004ND
2015-06-17Q1522698003ND
2015-06-17Q1522698002ND
2015-06-17Q1522698001ND
2015-08-04Q1530320005ND
2015-08-04Q1530320004ND
2015-08-04Q1530320003ND
2015-08-04Q15303200021.01 ppb
2015-08-04Q1530320001ND
2015-11-23Q1546368004ND
2015-11-23Q1546368003ND
2015-11-23Q1546368002ND
2015-11-23Q1546368001ND
2016-02-03Q1604696006ND
2016-02-03Q1604696005ND
2016-02-03Q1604696004ND
2016-02-03Q1604696003ND
2016-06-21Q1625738003ND
2016-06-21Q16257380011.17 ppb
2016-06-21Q16257380021.31 ppb
2016-06-21Q1625738004ND
2016-09-22Q16396290061.33 ppb
2016-09-22Q16396290051.14 ppb
2016-09-22Q16396290041.30 ppb
2016-09-22Q1639629003ND
2016-09-22Q1639629001ND
2016-12-13Q1654219003ND
2016-12-13Q1654219001ND
2016-12-13Q1654219002ND
2016-12-13Q1654219004ND
2017-02-21Q1707286008ND
2017-02-21Q1707286007ND
2017-02-21Q1707286006ND
2017-02-21Q1707286005ND
2017-05-16Q1719907001ND
2017-05-16Q1719907004ND
2017-05-16Q1719907002ND
2017-05-16Q1719907003ND
2017-09-21Q1745843006ND
2017-09-21Q1745843005ND
2017-09-21Q17458430041.03 ppb
2017-09-21Q1745843003ND
2017-09-21Q1745843001ND
2017-12-04Q1762012001ND
2017-12-04Q1762012004ND
2017-12-04Q1762012003ND
2017-12-04Q1762012002ND