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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Santa Clarita Water Division

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

 

272

Samples

0

Samples exceeding legal limit (MCL)

136

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.187 ppb456ND - 1.80 ppb
20151.08 ppb4319ND - 6.40 ppb
20161.26 ppb4720ND - 12.0 ppb
20173.00 ppb4733ND - 12.0 ppb
20182.66 ppb4528ND - 28.0 ppb
20192.40 ppb4530ND - 16.0 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
2014-02-139590-800-0950ND
2014-02-139590-801-1110ND
2014-02-139590-802-1130ND
2014-02-139590-803-1005ND
2014-02-139590-804-1000ND
2014-02-139590-805-1115ND
2014-02-139590-806-1040ND
2014-02-139590-807-1140ND
2014-05-159590-800-12001.20 ppb
2014-05-159590-801-1245ND
2014-05-159590-802-1215ND
2014-05-159590-803-1310ND
2014-05-159590-804-1400ND
2014-05-159590-805-1500ND
2014-05-159590-806-1330ND
2014-05-159590-807-1130ND
2014-06-112104-002-1010ND
2014-06-112104-006-0950ND
2014-06-112104-007-0845ND
2014-06-112104-008-1035ND
2014-06-112104-009-1030ND
2014-06-112104-012-0955ND
2014-06-112104-013-1100ND
2014-06-112104-014-1110ND
2014-06-112104-015-0920ND
2014-06-112104-016-1025ND
2014-06-112104-025-1000ND
2014-06-112104-039-0830ND
2014-06-112104-040-0855ND
2014-08-149590-800-13401.30 ppb
2014-08-149590-801-11051.50 ppb
2014-08-149590-802-1320ND
2014-08-149590-803-1225ND
2014-08-149590-804-1035ND
2014-08-149590-805-1000ND
2014-08-149590-806-1135ND
2014-08-149590-807-0925ND
2014-11-139590-800-13451.10 ppb
2014-11-139590-801-1230ND
2014-11-139590-802-1315ND
2014-11-139590-803-1345ND
2014-11-139590-804-14101.80 ppb
2014-11-139590-805-11151.50 ppb
2014-11-139590-806-1340ND
2014-11-139590-807-1155ND
2015-02-129590-800-12451.40 ppb
2015-02-129590-801-10053.60 ppb
2015-02-129590-802-12401.40 ppb
2015-02-129590-803-11302.30 ppb
2015-02-129590-804-10301.80 ppb
2015-02-129590-805-11001.40 ppb
2015-02-129590-806-11051.30 ppb
2015-02-129590-807-11453.10 ppb
2015-05-149590-800-1120ND
2015-05-149590-801-10506.40 ppb
2015-05-149590-802-1100ND
2015-05-149590-803-1140ND
2015-05-149590-804-0950ND
2015-05-149590-805-1015ND
2015-05-149590-806-1400ND
2015-05-149590-807-1320ND
2015-06-032104-002-0950ND
2015-06-032104-006-0945ND
2015-06-032104-007-0920ND
2015-06-032104-012-0825ND
2015-06-032104-015-0845ND
2015-06-032104-016-0840ND
2015-06-032104-019-0900ND
2015-06-032104-039-1035ND
2015-06-032104-040-0905ND
2015-06-102104-009-0845ND
2015-08-139590-800-11201.20 ppb
2015-08-139590-801-11006.00 ppb
2015-08-139590-802-1113ND
2015-08-139590-803-09422.00 ppb
2015-08-139590-804-1055ND
2015-08-139590-805-1030ND
2015-08-139590-806-1025ND
2015-08-139590-807-0945ND
2015-08-272104-025-0945ND
2015-11-099590-800-09001.20 ppb
2015-11-099590-801-08253.00 ppb
2015-11-099590-802-0830ND
2015-11-099590-803-09454.30 ppb
2015-11-099590-804-08451.60 ppb
2015-11-099590-805-07101.90 ppb
2015-11-099590-806-10301.30 ppb
2015-11-099590-807-10001.40 ppb
2016-01-299590-013-1110ND
2016-02-089590-800-1025ND
2016-02-089590-801-09301.40 ppb
2016-02-089590-802-1000ND
2016-02-089590-803-09101.10 ppb
2016-02-089590-804-10401.50 ppb
2016-02-089590-805-1115ND
2016-02-089590-806-0950ND
2016-02-089590-807-08401.90 ppb
2016-03-292104-014-1335ND
2016-05-099590-800-0900ND
2016-05-099590-801-10002.90 ppb
2016-05-099590-802-0830ND
2016-05-099590-803-0935ND
2016-05-099590-804-0925ND
2016-05-099590-805-0900ND
2016-05-099590-806-1030ND
2016-05-099590-807-1030ND
2016-06-012104-002-0935ND
2016-06-012104-006-0915ND
2016-06-012104-007-1020ND
2016-06-012104-009-0900ND
2016-06-012104-012-0950ND
2016-06-012104-013-1020ND
2016-06-012104-014-1030ND
2016-06-012104-015-1040ND
2016-06-012104-016-0850ND
2016-06-012104-019-0835ND
2016-06-012104-025-0940ND
2016-06-012104-039-1010ND
2016-06-012104-040-1030ND
2016-08-089590-800-09101.50 ppb
2016-08-089590-801-08454.00 ppb
2016-08-089590-802-0900ND
2016-08-089590-803-10301.10 ppb
2016-08-089590-804-11401.20 ppb
2016-08-089590-805-10451.30 ppb
2016-08-089590-806-11001.20 ppb
2016-08-089590-807-09501.10 ppb
2016-11-079590-800-08355.20 ppb
2016-11-079590-801-090512.0 ppb
2016-11-079590-802-08452.60 ppb
2016-11-079590-803-08404.40 ppb
2016-11-079590-804-09405.00 ppb
2016-11-079590-805-09053.70 ppb
2016-11-079590-806-09103.20 ppb
2016-11-079590-807-09003.10 ppb
2017-02-012104-008-0950ND
2017-02-069590-800-09453.60 ppb
2017-02-069590-801-10355.60 ppb
2017-02-069590-802-10103.80 ppb
2017-02-069590-803-11004.20 ppb
2017-02-069590-804-14003.60 ppb
2017-02-069590-805-13203.00 ppb
2017-02-069590-806-14203.60 ppb
2017-02-069590-807-11305.30 ppb
2017-05-089590-800-10103.40 ppb
2017-05-089590-801-08402.40 ppb
2017-05-089590-802-09003.20 ppb
2017-05-089590-803-09203.80 ppb
2017-05-089590-804-09452.50 ppb
2017-05-089590-805-09202.10 ppb
2017-05-089590-806-09402.80 ppb
2017-05-089590-807-08302.00 ppb
2017-06-082104-006-1115ND
2017-06-082104-007-0920ND
2017-06-082104-008-1145ND
2017-06-082104-009-0945ND
2017-06-082104-012-1120ND
2017-06-082104-013-1030ND
2017-06-082104-014-1050ND
2017-06-082104-015-1015ND
2017-06-082104-016-0950ND
2017-06-082104-019-1000ND
2017-06-082104-025-1030ND
2017-06-082104-039-0940ND
2017-08-079590-800-09154.60 ppb
2017-08-079590-801-101511.0 ppb
2017-08-079590-802-09405.00 ppb
2017-08-079590-803-10202.40 ppb
2017-08-079590-804-13201.40 ppb
2017-08-079590-805-10102.60 ppb
2017-08-079590-806-11301.20 ppb
2017-08-079590-807-09004.00 ppb
2017-10-042104-002-0849ND
2017-11-139590-800-11509.30 ppb
2017-11-139590-801-111512.0 ppb
2017-11-139590-802-11354.70 ppb
2017-11-139590-803-14108.30 ppb
2017-11-139590-804-11304.30 ppb
2017-11-139590-805-12004.40 ppb
2017-11-139590-806-13454.90 ppb
2017-11-139590-807-14003.90 ppb
2017-12-042104-040-13451.90 ppb
2018-02-059590-800-09453.10 ppb
2018-02-059590-801-10204.80 ppb
2018-02-059590-802-10003.80 ppb
2018-02-059590-803-09253.30 ppb
2018-02-059590-804-12002.70 ppb
2018-02-059590-805-10502.80 ppb
2018-02-059590-806-09001.000 ppb
2018-02-059590-807-09302.60 ppb
2018-05-079590-800-08453.20 ppb
2018-05-079590-801-095528.0 ppb
2018-05-079590-802-08351.40 ppb
2018-05-079590-803-11254.30 ppb
2018-05-079590-804-11301.40 ppb
2018-05-079590-805-10252.00 ppb
2018-05-079590-806-1110ND
2018-05-079590-807-09101.80 ppb
2018-06-062104-002-1030ND
2018-06-062104-006-1000ND
2018-06-062104-007-0840ND
2018-06-062104-008-1030ND
2018-06-062104-009-1015ND
2018-06-062104-012-1045ND
2018-06-062104-013-0900ND
2018-06-062104-014-0920ND
2018-06-062104-016-1010ND
2018-06-062104-019-0845ND
2018-06-062104-025-1110ND
2018-06-062104-039-0920ND
2018-06-062104-040-0855ND
2018-08-069590-800-11157.20 ppb
2018-08-069590-801-11254.00 ppb
2018-08-069590-802-1325ND
2018-08-069590-803-0845ND
2018-08-069590-804-10301.20 ppb
2018-08-069590-805-10001.50 ppb
2018-08-069590-806-0930ND
2018-08-069590-807-08403.30 ppb
2018-11-059590-800-13155.00 ppb
2018-11-059590-801-094517.0 ppb
2018-11-059590-802-08301.60 ppb
2018-11-059590-803-12153.10 ppb
2018-11-059590-804-11301.30 ppb
2018-11-059590-805-08402.30 ppb
2018-11-059590-806-11151.40 ppb
2018-11-059590-807-07004.50 ppb
2019-02-199590-800-10305.00 ppb
2019-02-199590-801-10504.60 ppb
2019-02-199590-802-09502.60 ppb
2019-02-199590-803-11353.70 ppb
2019-02-199590-804-1005ND
2019-02-199590-805-12002.40 ppb
2019-02-199590-806-11152.30 ppb
2019-02-199590-807-0840ND
2019-05-139590-800-10302.20 ppb
2019-05-139590-801-11004.90 ppb
2019-05-139590-802-10402.60 ppb
2019-05-139590-803-12001.90 ppb
2019-05-139590-804-09401.60 ppb
2019-05-139590-805-09102.10 ppb
2019-05-139590-806-11302.30 ppb
2019-05-139590-807-08207.30 ppb
2019-06-052104-002-1125ND
2019-06-052104-006-1135ND
2019-06-052104-008-1013ND
2019-06-052104-009-0950ND
2019-06-052104-012-1051ND
2019-06-052104-013-0902ND
2019-06-052104-014-0848ND
2019-06-052104-016-0959ND
2019-06-052104-019-0834ND
2019-06-052104-025-1037ND
2019-06-052104-039-0905ND
2019-06-052104-040-0923ND
2019-08-072104-007-0930ND
2019-08-129590-800-08102.00 ppb
2019-08-129590-801-09006.90 ppb
2019-08-129590-802-08304.10 ppb
2019-08-129590-803-07451.30 ppb
2019-08-129590-804-10005.80 ppb
2019-08-129590-805-10301.90 ppb
2019-08-129590-806-09301.20 ppb
2019-08-129590-807-11502.60 ppb
2019-11-049590-800-09454.20 ppb
2019-11-049590-801-101516.0 ppb
2019-11-049590-802-10002.90 ppb
2019-11-049590-804-08452.30 ppb
2019-11-049590-805-09102.60 ppb
2019-11-049590-807-10404.80 ppb
2019-11-149590-803-09552.40 ppb
2019-11-149590-806-10201.40 ppb