Menu

EWG's Tap Water Database

Donate

Chloroform

Beauregard Water Works District #3

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.

 

200

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20106.27 ppb24241.27 ppb - 15.0 ppb
20114.71 ppb3634ND - 15.0 ppb
2012ND100ND
20133.78 ppb4636ND - 15.2 ppb
20146.32 ppb36361.43 ppb - 12.3 ppb
20156.81 ppb48481.33 ppb - 16.8 ppb

ppb = parts per billion.

State and national drinking water standards and health guidelines

Health Guideline 0.4 ppb

The 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.

EPA Maximum Contaminant
Level Goal (MCLG)70.0 ppb

A non-enforceable federal health guideline. For cancer-causing chemicals, these health goals are typically set to zero.

ppb = parts per billion.

All test results

Date Lab ID Result
2010-06-022023557.90 ppb
2010-06-0220235610.00 ppb
2010-06-022023576.17 ppb
2010-06-022023585.66 ppb
2010-06-022023591.27 ppb
2010-06-022023602.85 ppb
2010-06-022023557.90 ppb
2010-06-0220235610.00 ppb
2010-06-022023576.17 ppb
2010-06-022023585.66 ppb
2010-06-022023591.27 ppb
2010-06-022023602.85 ppb
2010-09-212328662.75 ppb
2010-09-2123286715.0 ppb
2010-09-2123286810.4 ppb
2010-09-212328698.46 ppb
2010-09-212328703.26 ppb
2010-09-212328711.46 ppb
2010-09-212328662.75 ppb
2010-09-2123286715.0 ppb
2010-09-2123286810.4 ppb
2010-09-212328698.46 ppb
2010-09-212328703.26 ppb
2010-09-212328711.46 ppb
2011-02-2810040791.42 ppb
2011-02-281004081ND
2011-02-2810040831.30 ppb
2011-02-2810040852.85 ppb
2011-02-2810040875.91 ppb
2011-02-28100409010.4 ppb
2011-02-2810040791.42 ppb
2011-02-281004081ND
2011-02-2810040831.30 ppb
2011-02-2810040852.85 ppb
2011-02-2810040875.91 ppb
2011-02-28100409010.4 ppb
2011-06-07103154615.0 ppb
2011-06-0710315475.81 ppb
2011-06-0710315483.13 ppb
2011-06-0710315491.71 ppb
2011-06-0710315501.72 ppb
2011-06-0710315512.00 ppb
2011-06-07103154615.0 ppb
2011-06-0710315475.81 ppb
2011-06-0710315483.13 ppb
2011-06-0710315491.71 ppb
2011-06-0710315501.72 ppb
2011-06-0710315512.00 ppb
2011-08-021.475524.42 ppb
2011-08-02104755014.0 ppb
2011-08-0210475517.84 ppb
2011-08-0210475532.87 ppb
2011-08-0210475542.04 ppb
2011-08-0210475552.44 ppb
2011-08-021.475524.42 ppb
2011-08-02104755014.0 ppb
2011-08-0210475517.84 ppb
2011-08-0210475532.87 ppb
2011-08-0210475542.04 ppb
2011-08-0210475552.44 ppb
2012-11-05AD72984ND
2012-11-05AD72985ND
2012-11-05AD72986ND
2012-11-05AD72987ND
2012-11-05AD72988ND
2012-11-05AD72984ND
2012-11-05AD72985ND
2012-11-05AD72986ND
2012-11-05AD72987ND
2012-11-05AD72988ND
2013-01-14AD74757ND
2013-01-14AD74758ND
2013-01-14AD74759ND
2013-01-14AD74760ND
2013-01-14AD74761ND
2013-01-14AD74757ND
2013-01-14AD74758ND
2013-01-14AD74759ND
2013-01-14AD74760ND
2013-01-14AD74761ND
2013-06-24121901311.6 ppb
2013-06-2412190145.74 ppb
2013-06-2412190154.47 ppb
2013-06-2412190161.47 ppb
2013-06-2412190172.54 ppb
2013-06-2412190182.12 ppb
2013-06-24121901311.6 ppb
2013-06-2412190145.74 ppb
2013-06-2412190154.47 ppb
2013-06-2412190161.47 ppb
2013-06-2412190172.54 ppb
2013-06-2412190182.12 ppb
2013-09-24124225115.2 ppb
2013-09-2412422556.76 ppb
2013-09-2412422564.45 ppb
2013-09-2412422572.03 ppb
2013-09-2412422582.94 ppb
2013-09-2412422592.08 ppb
2013-09-24124225115.2 ppb
2013-09-2412422556.76 ppb
2013-09-2412422564.45 ppb
2013-09-2412422572.03 ppb
2013-09-2412422582.94 ppb
2013-09-2412422592.08 ppb
2013-12-1712639452.09 ppb
2013-12-17126394610.5 ppb
2013-12-1712639471.86 ppb
2013-12-1712639483.75 ppb
2013-12-1712639495.90 ppb
2013-12-1712639501.36 ppb
2013-12-1712639452.09 ppb
2013-12-17126394610.5 ppb
2013-12-1712639471.86 ppb
2013-12-1712639483.75 ppb
2013-12-1712639495.90 ppb
2013-12-1712639501.36 ppb
2014-03-2512879632.61 ppb
2014-03-2512879651.84 ppb
2014-03-2512879664.08 ppb
2014-03-2512879676.91 ppb
2014-03-25128796811.6 ppb
2014-03-25128796911.6 ppb
2014-03-2512879632.61 ppb
2014-03-2512879651.84 ppb
2014-03-2512879664.08 ppb
2014-03-2512879676.91 ppb
2014-03-25128796811.6 ppb
2014-03-25128796911.6 ppb
2014-06-2513129265.99 ppb
2014-06-2513129274.90 ppb
2014-06-25131292810.8 ppb
2014-06-2513129291.43 ppb
2014-06-25131293012.3 ppb
2014-06-25131293110.5 ppb
2014-06-2513129265.99 ppb
2014-06-2513129274.90 ppb
2014-06-25131292810.8 ppb
2014-06-2513129291.43 ppb
2014-06-25131293012.3 ppb
2014-06-25131293110.5 ppb
2014-12-0313551297.03 ppb
2014-12-0313551302.83 ppb
2014-12-0313551313.54 ppb
2014-12-0313551322.42 ppb
2014-12-03135513311.1 ppb
2014-12-0313551342.28 ppb
2014-12-0313551297.03 ppb
2014-12-0313551302.83 ppb
2014-12-0313551313.54 ppb
2014-12-0313551322.42 ppb
2014-12-03135513311.1 ppb
2014-12-0313551342.28 ppb
2015-03-2413817083.42 ppb
2015-03-2413817124.58 ppb
2015-03-2413817138.16 ppb
2015-03-2413817142.67 ppb
2015-03-24138171514.7 ppb
2015-03-24138171614.0 ppb
2015-03-2413817083.42 ppb
2015-03-2413817124.58 ppb
2015-03-2413817138.16 ppb
2015-03-2413817142.67 ppb
2015-03-24138171514.7 ppb
2015-03-24138171614.0 ppb
2015-06-2314051722.82 ppb
2015-06-2314051743.25 ppb
2015-06-2314051752.86 ppb
2015-06-2314051765.02 ppb
2015-06-2314051779.18 ppb
2015-06-23140517816.8 ppb
2015-06-2314051722.82 ppb
2015-06-2314051743.25 ppb
2015-06-2314051752.86 ppb
2015-06-2314051765.02 ppb
2015-06-2314051779.18 ppb
2015-06-23140517816.8 ppb
2015-09-2414302674.23 ppb
2015-09-2414302704.83 ppb
2015-09-24143027112.2 ppb
2015-09-2414302723.00 ppb
2015-09-24143027315.9 ppb
2015-09-2414302742.90 ppb
2015-09-2414302674.23 ppb
2015-09-2414302704.83 ppb
2015-09-24143027112.2 ppb
2015-09-2414302723.00 ppb
2015-09-24143027315.9 ppb
2015-09-2414302742.90 ppb
2015-12-0914503738.89 ppb
2015-12-0914503745.25 ppb
2015-12-0914503751.33 ppb
2015-12-0914503762.07 ppb
2015-12-0914503771.94 ppb
2015-12-09145037813.4 ppb
2015-12-0914503738.89 ppb
2015-12-0914503745.25 ppb
2015-12-0914503751.33 ppb
2015-12-0914503762.07 ppb
2015-12-0914503771.94 ppb
2015-12-09145037813.4 ppb