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EWG's Tap Water Database — 2019 UPDATE

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Chloroform

Mission Springs WD

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.

 

30

Samples

0

Samples exceeding legal limit (MCL)

5

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND20ND
2013N/A00N/A
20140.0917 ppb121ND - 1.10 ppb
20151.15 ppb21ND - 2.30 ppb
20160.750 ppb21ND - 1.50 ppb
20170.183 ppb122ND - 1.20 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
2012-08-133761-030-0744ND
2012-10-313761-026-1014ND
2014-07-073761-026-08251.10 ppb
2014-07-073761-014-0911ND
2014-07-083761-008-0817ND
2014-07-083761-010-0747ND
2014-07-083761-030-0922ND
2014-07-083761-015-0849ND
2014-07-093761-011-1203ND
2014-07-093761-017-1051ND
2014-07-093761-025-1118ND
2014-07-093761-013-1035ND
2014-09-083761-802-1318ND
2014-09-083761-801-1115ND
2015-09-083761-802-1354ND
2015-09-083761-801-13222.30 ppb
2016-09-143761-801-09441.50 ppb
2016-09-143761-802-1011ND
2017-06-013761-015-1246ND
2017-06-013761-013-1108ND
2017-06-053761-026-12001.000 ppb
2017-06-053761-014-1130ND
2017-06-063761-025-1300ND
2017-06-063761-011-1200ND
2017-06-063761-010-0945ND
2017-06-063761-017-1100ND
2017-06-073761-008-1124ND
2017-06-073761-030-1200ND
2017-09-113761-801-08521.20 ppb
2017-09-113761-802-0817ND