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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Waterville Fire District 1

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

 

58

Samples

0

Samples exceeding legal limit (MCL)

10

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND120ND
2015ND50ND
20160.113 ppb356ND - 1.29 ppb
20171.36 ppb53ND - 4.30 ppb
20180.600 ppb110.600 ppb
2019N/A00N/A

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
2014-05-1314V00186ND
2014-07-0915V00005ND
2014-08-0415V00019ND
2014-09-30SB97478-09ND
2014-09-30SB97478-08ND
2014-09-30SB97478-07ND
2014-09-30SB97478-06ND
2014-09-30SB97478-05ND
2014-09-30SB97478-04ND
2014-09-30SB97478-03ND
2014-09-30SB97478-01ND
2014-11-1215V00134ND
2015-03-0515V00177ND
2015-04-2015V00191ND
2015-07-0716V00004ND
2015-08-2416V00043ND
2015-10-2916V00063ND
2016-02-2216V00099ND
2016-05-2416V00136ND
2016-06-23SC22991-12ND
2016-06-23SC22991-22ND
2016-06-23SC22991-20ND
2016-06-23SC22991-19ND
2016-06-23SC22991-180.510 ppb
2016-06-23SC22991-17ND
2016-06-23SC22991-161.29 ppb
2016-06-23SC22991-15ND
2016-06-23SC22991-14ND
2016-06-23SC22991-13ND
2016-09-16SC26197-07ND
2016-09-19SC26197-02ND
2016-09-19SC26197-01ND
2016-09-19SC26197-03ND
2016-09-19SC26197-04ND
2016-09-19SC26197-05ND
2016-09-19SC26197-06ND
2016-09-19SC26197-09ND
2016-09-19SC26197-10ND
2016-10-2817V000520.600 ppb
2016-12-15SC29638-10ND
2016-12-15SC29638-01ND
2016-12-15SC29638-02ND
2016-12-15SC29638-04ND
2016-12-15SC29638-05ND
2016-12-15SC29638-060.500 ppb
2016-12-15SC29638-070.520 ppb
2016-12-15SC29638-08ND
2016-12-15SC29638-09ND
2016-12-15SC29638-11ND
2016-12-15SC29638-120.540 ppb
2016-12-15SC29638-13ND
2016-12-2117V00066ND
2017-01-161701-01291-0044.30 ppb
2017-01-161701-01291-001ND
2017-05-161705-10340-0021.90 ppb
2017-05-161705-10340-001ND
2017-08-241708-19899-0010.600 ppb
2018-06-271806-15203-0010.600 ppb