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EWG's Tap Water Database — 2019 UPDATE

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Chloroform

East Cherry Creek Valley Water and Sanitation District

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.

 

104

Samples

0

Samples exceeding legal limit (MCL)

82

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.657 ppb142ND - 6.80 ppb
2013ND20ND
2014N/A00N/A
20158.12 ppb2422ND - 25.0 ppb
20162.94 ppb3227ND - 8.90 ppb
20176.88 ppb3231ND - 23.2 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 Result
2012-04-12ND
2012-04-12ND
2012-04-136.80 ppb
2012-04-19ND
2012-04-23ND
2012-04-26ND
2012-04-26ND
2012-05-04ND
2012-05-10ND
2012-05-17ND
2012-05-17ND
2012-05-252.40 ppb
2012-07-13ND
2012-10-25ND
2013-06-05ND
2013-07-17ND
2015-05-073.40 ppb
2015-05-072.90 ppb
2015-05-073.20 ppb
2015-05-073.30 ppb
2015-05-072.60 ppb
2015-05-073.00 ppb
2015-05-072.00 ppb
2015-05-072.10 ppb
2015-08-124.90 ppb
2015-08-12ND
2015-08-125.20 ppb
2015-08-126.00 ppb
2015-08-124.10 ppb
2015-08-124.40 ppb
2015-08-123.80 ppb
2015-08-124.00 ppb
2015-11-2322.9 ppb
2015-11-2317.4 ppb
2015-11-2319.3 ppb
2015-11-2325.0 ppb
2015-11-2319.2 ppb
2015-11-23ND
2015-11-2318.1 ppb
2015-11-2318.0 ppb
2016-02-125.30 ppb
2016-02-12ND
2016-02-12ND
2016-02-125.50 ppb
2016-02-123.50 ppb
2016-02-121.000 ppb
2016-02-122.20 ppb
2016-02-124.20 ppb
2016-05-194.20 ppb
2016-05-19ND
2016-05-194.00 ppb
2016-05-194.50 ppb
2016-05-193.60 ppb
2016-05-191.40 ppb
2016-05-193.40 ppb
2016-05-193.40 ppb
2016-08-192.10 ppb
2016-08-19ND
2016-08-19ND
2016-08-193.00 ppb
2016-08-192.50 ppb
2016-08-191.40 ppb
2016-08-191.40 ppb
2016-08-192.10 ppb
2016-11-038.90 ppb
2016-11-034.70 ppb
2016-11-034.20 ppb
2016-11-035.90 ppb
2016-11-034.30 ppb
2016-11-031.60 ppb
2016-11-033.10 ppb
2016-11-032.70 ppb
2017-02-097.60 ppb
2017-02-096.60 ppb
2017-02-097.40 ppb
2017-02-098.80 ppb
2017-02-097.60 ppb
2017-02-090.900 ppb
2017-02-097.10 ppb
2017-02-096.40 ppb
2017-05-175.00 ppb
2017-05-170.800 ppb
2017-05-17ND
2017-05-174.80 ppb
2017-05-173.60 ppb
2017-05-171.000 ppb
2017-05-172.90 ppb
2017-05-173.50 ppb
2017-08-102.80 ppb
2017-08-102.60 ppb
2017-08-103.30 ppb
2017-08-104.30 ppb
2017-08-102.80 ppb
2017-08-102.80 ppb
2017-08-102.30 ppb
2017-08-102.30 ppb
2017-11-0923.2 ppb
2017-11-0918.6 ppb
2017-11-0916.6 ppb
2017-11-0917.1 ppb
2017-11-0915.9 ppb
2017-11-0914.8 ppb
2017-11-0913.6 ppb
2017-11-103.00 ppb