Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Chloroform

Glendora Water Department

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

 

239

Samples

0

Samples exceeding legal limit (MCL)

89

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20146.48 ppb3919ND - 58.0 ppb
20150.0625 ppb402ND - 1.30 ppb
20160.780 ppb4014ND - 5.80 ppb
20170.788 ppb4016ND - 4.50 ppb
20181.48 ppb4019ND - 13.0 ppb
20190.748 ppb4019ND - 4.50 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
2014-01-249588-800-0835ND
2014-01-249588-801-1015ND
2014-01-249588-802-1000ND
2014-01-249588-803-0915ND
2014-01-249588-804-0905ND
2014-01-249588-805-0935ND
2014-01-249588-806-0925ND
2014-01-249588-807-0945ND
2014-03-049588-006-0915ND
2014-03-049588-008-1020ND
2014-03-049588-020-1005ND
2014-04-239588-800-08154.10 ppb
2014-04-239588-801-0935ND
2014-04-239588-802-0930ND
2014-04-239588-803-08504.20 ppb
2014-04-239588-804-08403.70 ppb
2014-04-239588-805-09104.00 ppb
2014-04-239588-806-09003.60 ppb
2014-04-239588-807-0920ND
2014-07-249588-800-104058.0 ppb
2014-07-249588-801-091514.0 ppb
2014-07-249588-802-090014.0 ppb
2014-07-249588-803-102522.0 ppb
2014-07-249588-804-101543.0 ppb
2014-07-249588-805-095015.0 ppb
2014-07-249588-806-100013.0 ppb
2014-07-249588-807-0935ND
2014-09-099588-007-1030ND
2014-09-099588-009-0925ND
2014-09-099588-015-1010ND
2014-09-179588-010-0950ND
2014-10-279588-800-083513.0 ppb
2014-10-279588-801-101013.0 ppb
2014-10-279588-802-09553.00 ppb
2014-10-279588-803-09059.30 ppb
2014-10-279588-804-08552.20 ppb
2014-10-279588-805-092512.0 ppb
2014-10-279588-806-09151.80 ppb
2014-10-279588-807-0940ND
2015-01-289588-800-0820ND
2015-01-289588-801-0930ND
2015-01-289588-802-0940ND
2015-01-289588-803-0850ND
2015-01-289588-804-0840ND
2015-01-289588-805-0910ND
2015-01-289588-806-0900ND
2015-01-289588-807-0920ND
2015-03-259588-002-0910ND
2015-03-259588-006-0955ND
2015-03-259588-008-0930ND
2015-03-259588-020-0900ND
2015-04-239588-800-0800ND
2015-04-239588-801-0925ND
2015-04-239588-802-0915ND
2015-04-239588-803-0830ND
2015-04-239588-804-0820ND
2015-04-239588-805-0850ND
2015-04-239588-806-0840ND
2015-04-239588-807-0900ND
2015-07-279588-800-1010ND
2015-07-279588-801-1135ND
2015-07-279588-802-11301.20 ppb
2015-07-279588-803-1045ND
2015-07-279588-804-1035ND
2015-07-279588-805-1105ND
2015-07-279588-806-1055ND
2015-07-279588-807-1115ND
2015-09-099588-007-0940ND
2015-09-099588-009-0925ND
2015-09-099588-010-1010ND
2015-09-099588-015-1025ND
2015-10-289588-800-0920ND
2015-10-289588-801-1040ND
2015-10-289588-802-10301.30 ppb
2015-10-289588-803-0940ND
2015-10-289588-804-0930ND
2015-10-289588-805-1005ND
2015-10-289588-806-0955ND
2015-10-289588-807-1015ND
2016-01-259588-800-08303.70 ppb
2016-01-259588-801-11555.80 ppb
2016-01-259588-802-11401.000 ppb
2016-01-259588-803-10554.70 ppb
2016-01-259588-804-10452.00 ppb
2016-01-259588-805-11154.10 ppb
2016-01-259588-806-11052.00 ppb
2016-01-259588-807-1125ND
2016-03-039588-002-0930ND
2016-03-039588-006-1000ND
2016-03-039588-008-0940ND
2016-03-039588-020-0920ND
2016-04-279588-800-0825ND
2016-04-279588-801-0955ND
2016-04-279588-802-09401.000 ppb
2016-04-279588-803-0855ND
2016-04-279588-804-0845ND
2016-04-279588-805-0910ND
2016-04-279588-806-0905ND
2016-04-279588-807-0925ND
2016-07-259588-800-0810ND
2016-07-259588-801-1105ND
2016-07-259588-802-1115ND
2016-07-259588-803-0840ND
2016-07-259588-804-0835ND
2016-07-259588-805-0850ND
2016-07-259588-806-0845ND
2016-07-259588-807-0900ND
2016-09-089588-007-0930ND
2016-09-089588-009-1015ND
2016-09-089588-010-0940ND
2016-09-089588-015-0955ND
2016-10-259588-800-08201.20 ppb
2016-10-259588-801-11451.20 ppb
2016-10-259588-802-11301.50 ppb
2016-10-259588-803-08501.000 ppb
2016-10-259588-804-0840ND
2016-10-259588-805-11001.000 ppb
2016-10-259588-806-09001.000 ppb
2016-10-259588-807-1115ND
2017-01-279588-800-0805ND
2017-01-279588-801-0930ND
2017-01-279588-802-0915ND
2017-01-279588-803-0830ND
2017-01-279588-804-0820ND
2017-01-279588-805-0850ND
2017-01-279588-806-0840ND
2017-01-279588-807-0900ND
2017-03-029588-002-0800ND
2017-03-029588-006-0835ND
2017-03-029588-008-0810ND
2017-03-029588-020-0755ND
2017-04-259588-800-0820ND
2017-04-259588-801-1115ND
2017-04-259588-802-11301.10 ppb
2017-04-259588-803-0900ND
2017-04-259588-804-08501.20 ppb
2017-04-259588-805-0920ND
2017-04-259588-806-0910ND
2017-04-259588-807-0930ND
2017-07-259588-800-12201.30 ppb
2017-07-259588-801-13301.10 ppb
2017-07-259588-802-13201.60 ppb
2017-07-259588-803-12051.20 ppb
2017-07-259588-804-11552.00 ppb
2017-07-259588-805-1240ND
2017-07-259588-806-11401.40 ppb
2017-07-259588-807-1300ND
2017-09-079588-007-0920ND
2017-09-079588-009-0850ND
2017-09-079588-010-0930ND
2017-09-079588-015-0940ND
2017-10-279588-800-08203.00 ppb
2017-10-279588-801-09552.80 ppb
2017-10-279588-802-09401.30 ppb
2017-10-279588-803-08504.50 ppb
2017-10-279588-804-08402.60 ppb
2017-10-279588-805-09103.00 ppb
2017-10-279588-806-09002.20 ppb
2017-10-279588-807-09251.20 ppb
2018-01-269588-800-08302.30 ppb
2018-01-269588-801-10053.10 ppb
2018-01-269588-802-09503.40 ppb
2018-01-269588-803-09002.00 ppb
2018-01-269588-804-08502.60 ppb
2018-01-269588-805-0000ND
2018-01-269588-806-09101.50 ppb
2018-01-269588-807-0935ND
2018-03-079588-002-0840ND
2018-03-079588-006-0910ND
2018-03-079588-008-0850ND
2018-03-079588-020-0835ND
2018-04-259588-800-082013.0 ppb
2018-04-259588-801-1125ND
2018-04-259588-802-11151.50 ppb
2018-04-259588-803-0900ND
2018-04-259588-804-08501.30 ppb
2018-04-259588-805-0920ND
2018-04-259588-806-0910ND
2018-04-259588-807-1055ND
2018-07-279588-800-07254.40 ppb
2018-07-279588-801-08355.60 ppb
2018-07-279588-802-08252.40 ppb
2018-07-279588-803-07504.90 ppb
2018-07-279588-804-07452.00 ppb
2018-07-279588-805-08102.90 ppb
2018-07-279588-806-08002.20 ppb
2018-07-279588-807-0810ND
2018-09-149588-007-1005ND
2018-09-149588-009-0925ND
2018-09-149588-010-1025ND
2018-09-149588-015-1050ND
2018-10-269588-800-08401.30 ppb
2018-10-269588-801-1030ND
2018-10-269588-802-10151.20 ppb
2018-10-269588-803-0930ND
2018-10-269588-804-09201.60 ppb
2018-10-269588-805-0950ND
2018-10-269588-806-0940ND
2018-10-269588-807-1005ND
2019-01-259588-800-0915ND
2019-01-259588-801-11151.10 ppb
2019-01-259588-802-11001.20 ppb
2019-01-259588-803-1015ND
2019-01-259588-804-1005ND
2019-01-259588-805-1035ND
2019-01-259588-806-1025ND
2019-01-259588-807-1045ND
2019-03-139588-002-08154.50 ppb
2019-03-139588-006-0845ND
2019-03-139588-008-0825ND
2019-03-139588-020-0810ND
2019-04-249588-800-0805ND
2019-04-249588-801-0930ND
2019-04-249588-802-0920ND
2019-04-249588-803-0835ND
2019-04-249588-804-08251.10 ppb
2019-04-249588-805-0855ND
2019-04-249588-806-0845ND
2019-04-249588-807-0910ND
2019-07-249588-800-08101.50 ppb
2019-07-249588-801-0945ND
2019-07-249588-802-09351.40 ppb
2019-07-249588-803-08451.60 ppb
2019-07-249588-804-08351.80 ppb
2019-07-249588-805-09051.10 ppb
2019-07-249588-806-08551.90 ppb
2019-07-249588-807-09201.20 ppb
2019-09-199588-007-0820ND
2019-09-199588-009-0910ND
2019-09-249588-010-13501.30 ppb
2019-09-249588-015-1335ND
2019-10-259588-800-08051.80 ppb
2019-10-259588-801-1025ND
2019-10-259588-802-10051.40 ppb
2019-10-259588-803-09151.40 ppb
2019-10-259588-804-09051.50 ppb
2019-10-259588-805-09351.30 ppb
2019-10-259588-806-09251.50 ppb
2019-10-259588-807-09451.30 ppb