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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Compton 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

 

280

Samples

0

Samples exceeding legal limit (MCL)

151

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20141.25 ppb4926ND - 5.20 ppb
20151.12 ppb5026ND - 3.80 ppb
20161.53 ppb4827ND - 4.90 ppb
20171.80 ppb4830ND - 5.40 ppb
20180.664 ppb4419ND - 3.20 ppb
20191.16 ppb4123ND - 4.90 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
2014-01-139588-011-0956ND
2014-01-139588-013-1042ND
2014-01-139588-014-1020ND
2014-01-139588-019-1105ND
2014-01-139588-028-1118ND
2014-03-073761-800-09201.60 ppb
2014-03-073761-801-09001.70 ppb
2014-03-073761-802-1000ND
2014-03-073761-803-09402.00 ppb
2014-03-073761-804-11001.70 ppb
2014-03-073761-805-11204.40 ppb
2014-03-073761-806-1020ND
2014-03-073761-807-10402.40 ppb
2014-04-179588-011-1010ND
2014-04-179588-014-1054ND
2014-06-063761-800-1415ND
2014-06-063761-801-13302.40 ppb
2014-06-063761-802-15002.40 ppb
2014-06-063761-803-1430ND
2014-06-063761-804-13152.80 ppb
2014-06-063761-805-14452.70 ppb
2014-06-063761-806-14002.80 ppb
2014-06-063761-807-13451.90 ppb
2014-06-269588-019-1148ND
2014-07-299588-011-0906ND
2014-07-299588-014-1003ND
2014-07-299588-015-0933ND
2014-07-299588-019-0946ND
2014-09-133761-800-09103.60 ppb
2014-09-133761-801-10201.20 ppb
2014-09-133761-802-1130ND
2014-09-133761-803-13152.60 ppb
2014-09-133761-804-13504.80 ppb
2014-09-133761-805-09005.20 ppb
2014-09-133761-806-14151.10 ppb
2014-09-133761-807-09451.30 ppb
2014-10-319588-009-0934ND
2014-10-319588-011-0958ND
2014-10-319588-014-1019ND
2014-11-079588-015-1050ND
2014-11-079588-019-1018ND
2014-12-153761-800-11001.40 ppb
2014-12-153761-801-10451.50 ppb
2014-12-153761-802-1000ND
2014-12-153761-803-11151.50 ppb
2014-12-153761-804-10151.30 ppb
2014-12-153761-805-13204.30 ppb
2014-12-153761-806-10001.30 ppb
2014-12-153761-807-10301.40 ppb
2015-01-299588-009-0944ND
2015-01-299588-011-0959ND
2015-01-299588-013-1045ND
2015-01-299588-014-1103ND
2015-01-299588-019-1014ND
2015-01-299588-028-1127ND
2015-03-093761-800-10551.90 ppb
2015-03-093761-801-10301.80 ppb
2015-03-093761-802-0935ND
2015-03-093761-803-11052.00 ppb
2015-03-093761-804-10152.00 ppb
2015-03-093761-805-11152.30 ppb
2015-03-093761-806-10402.50 ppb
2015-03-093761-807-10252.00 ppb
2015-04-169588-011-1039ND
2015-04-169588-014-1055ND
2015-04-169588-019-0940ND
2015-06-093761-803-14452.00 ppb
2015-06-093761-806-14352.00 ppb
2015-06-153761-800-14001.70 ppb
2015-06-153761-801-10152.00 ppb
2015-06-153761-802-09503.20 ppb
2015-06-153761-804-10001.80 ppb
2015-06-153761-805-11103.80 ppb
2015-06-153761-807-1030ND
2015-07-249588-009-1005ND
2015-07-249588-011-0934ND
2015-07-249588-014-1305ND
2015-07-249588-019-1107ND
2015-09-093761-800-10001.20 ppb
2015-09-093761-801-09452.30 ppb
2015-09-093761-802-1000ND
2015-09-093761-803-10101.20 ppb
2015-09-093761-804-09251.30 ppb
2015-09-093761-805-1115ND
2015-09-093761-806-09353.60 ppb
2015-09-093761-807-09151.40 ppb
2015-10-229588-009-1112ND
2015-10-229588-011-1028ND
2015-10-229588-014-0951ND
2015-10-229588-015-1010ND
2015-10-229588-019-0938ND
2015-12-213761-800-10252.80 ppb
2015-12-213761-801-09552.10 ppb
2015-12-213761-802-0920ND
2015-12-213761-803-10351.50 ppb
2015-12-213761-804-09402.70 ppb
2015-12-213761-805-1106ND
2015-12-213761-806-10152.00 ppb
2015-12-213761-807-10053.10 ppb
2016-01-279588-011-0943ND
2016-01-279588-013-0958ND
2016-01-279588-014-1125ND
2016-01-279588-019-1057ND
2016-01-279588-028-1107ND
2016-03-143761-801-13454.90 ppb
2016-03-143761-804-13304.80 ppb
2016-03-143761-805-12304.70 ppb
2016-03-153761-800-10304.60 ppb
2016-03-153761-802-11202.00 ppb
2016-03-153761-803-10402.80 ppb
2016-03-153761-806-10204.90 ppb
2016-03-153761-807-10103.80 ppb
2016-04-289588-011-1030ND
2016-04-289588-014-1120ND
2016-04-289588-019-1110ND
2016-06-203761-800-08101.000 ppb
2016-06-203761-801-10351.80 ppb
2016-06-203761-802-1150ND
2016-06-203761-803-0935ND
2016-06-203761-804-09002.50 ppb
2016-06-203761-805-0830ND
2016-06-203761-806-10061.000 ppb
2016-06-203761-807-11201.30 ppb
2016-07-159588-011-1057ND
2016-07-159588-014-1036ND
2016-07-159588-019-1048ND
2016-09-063761-800-09031.20 ppb
2016-09-063761-801-09251.40 ppb
2016-09-063761-802-1120ND
2016-09-063761-803-0947ND
2016-09-063761-804-10312.40 ppb
2016-09-063761-805-11051.90 ppb
2016-09-063761-806-10151.000 ppb
2016-09-063761-807-10331.80 ppb
2016-10-059588-009-1045ND
2016-10-059588-011-1222ND
2016-10-059588-014-1202ND
2016-10-059588-015-1103ND
2016-10-059588-019-1125ND
2016-12-113761-800-14453.30 ppb
2016-12-113761-801-14201.80 ppb
2016-12-113761-802-13153.30 ppb
2016-12-113761-803-15154.10 ppb
2016-12-113761-804-14001.90 ppb
2016-12-113761-805-13304.20 ppb
2016-12-113761-806-14102.10 ppb
2016-12-113761-807-14303.10 ppb
2017-01-249588-011-1015ND
2017-01-249588-013-1000ND
2017-01-249588-014-1110ND
2017-01-249588-019-1043ND
2017-01-249588-028-1055ND
2017-03-023761-800-09584.20 ppb
2017-03-023761-801-10514.80 ppb
2017-03-023761-802-1205ND
2017-03-023761-803-11082.30 ppb
2017-03-023761-804-11364.40 ppb
2017-03-023761-805-11505.40 ppb
2017-03-023761-806-11034.70 ppb
2017-03-023761-807-11203.00 ppb
2017-04-269588-011-1015ND
2017-04-269588-014-1120ND
2017-04-269588-019-1035ND
2017-04-269588-028-1145ND
2017-06-203761-800-10021.40 ppb
2017-06-203761-801-10221.90 ppb
2017-06-203761-802-11251.80 ppb
2017-06-203761-803-10051.70 ppb
2017-06-203761-804-10491.30 ppb
2017-06-203761-805-11074.80 ppb
2017-06-203761-806-10142.00 ppb
2017-06-203761-807-10313.70 ppb
2017-07-189588-011-0950ND
2017-07-189588-019-1035ND
2017-09-123761-800-10102.30 ppb
2017-09-123761-801-09103.50 ppb
2017-09-123761-803-10101.70 ppb
2017-09-123761-806-13205.30 ppb
2017-09-123761-807-12151.60 ppb
2017-09-143761-802-08301.10 ppb
2017-09-143761-804-09302.70 ppb
2017-09-143761-805-09454.80 ppb
2017-10-059588-011-1140ND
2017-10-059588-015-1045ND
2017-10-059588-019-1020ND
2017-10-059588-028-1000ND
2017-12-119588-009-1032ND
2017-12-113761-800-08302.10 ppb
2017-12-113761-801-09102.00 ppb
2017-12-113761-802-1345ND
2017-12-113761-803-08512.00 ppb
2017-12-113761-804-10302.20 ppb
2017-12-113761-805-10553.10 ppb
2017-12-113761-806-09302.70 ppb
2017-12-113761-807-09501.80 ppb
2018-01-099588-009-1041ND
2018-01-099588-013-1049ND
2018-01-099588-019-1001ND
2018-01-099588-028-0934ND
2018-03-113761-800-13301.10 ppb
2018-03-113761-801-13502.00 ppb
2018-03-113761-803-12151.90 ppb
2018-03-113761-806-1415ND
2018-03-113761-807-1530ND
2018-03-123761-802-0930ND
2018-03-123761-804-1115ND
2018-03-123761-805-10301.20 ppb
2018-04-129588-013-1015ND
2018-04-129588-019-1110ND
2018-06-063761-800-1130ND
2018-06-063761-801-10201.80 ppb
2018-06-063761-802-1420ND
2018-06-063761-803-11001.20 ppb
2018-06-063761-804-15151.30 ppb
2018-06-063761-805-14101.20 ppb
2018-06-063761-806-12301.30 ppb
2018-06-063761-807-13301.50 ppb
2018-06-289588-011-1035ND
2018-06-289588-014-1015ND
2018-07-239588-011-1035ND
2018-07-239588-019-0955ND
2018-09-143761-800-11451.20 ppb
2018-09-143761-801-11301.70 ppb
2018-09-143761-803-1200ND
2018-09-143761-804-11001.20 ppb
2018-09-143761-807-1115ND
2018-09-153761-802-1355ND
2018-09-173761-805-09402.40 ppb
2018-09-173761-806-09351.30 ppb
2018-10-259588-019-1125ND
2018-12-123761-800-09151.30 ppb
2018-12-123761-801-10301.20 ppb
2018-12-123761-802-1310ND
2018-12-123761-803-0945ND
2018-12-123761-804-1425ND
2018-12-123761-805-15053.20 ppb
2018-12-123761-806-11151.20 ppb
2018-12-123761-807-1210ND
2018-12-199588-015-1130ND
2019-01-309588-009-1125ND
2019-01-309588-019-0945ND
2019-01-309588-028-1005ND
2019-03-263761-800-09301.70 ppb
2019-03-263761-801-09152.60 ppb
2019-03-263761-802-0950ND
2019-03-263761-803-10051.80 ppb
2019-03-263761-804-14091.70 ppb
2019-03-263761-805-13474.10 ppb
2019-03-263761-806-10052.50 ppb
2019-03-263761-807-14331.80 ppb
2019-04-259588-019-1013ND
2019-06-173761-800-14452.00 ppb
2019-06-173761-801-10551.60 ppb
2019-06-173761-802-10401.60 ppb
2019-06-173761-803-1405ND
2019-06-173761-804-1015ND
2019-06-173761-805-0920ND
2019-06-173761-806-13451.70 ppb
2019-06-173761-807-1310ND
2019-07-179588-011-1005ND
2019-07-179588-019-0930ND
2019-09-103761-800-11452.70 ppb
2019-09-103761-801-15051.90 ppb
2019-09-103761-802-11151.70 ppb
2019-09-103761-803-10201.10 ppb
2019-09-103761-804-14451.80 ppb
2019-09-103761-805-13204.90 ppb
2019-09-103761-806-1530ND
2019-09-103761-807-1557ND
2019-10-189588-015-1040ND
2019-10-189588-019-1015ND
2019-11-209588-013-1015ND
2019-12-103761-800-09251.90 ppb
2019-12-103761-801-09501.20 ppb
2019-12-103761-802-1120ND
2019-12-103761-803-10301.60 ppb
2019-12-103761-804-10401.60 ppb
2019-12-103761-805-11002.70 ppb
2019-12-103761-806-09551.50 ppb
2019-12-103761-807-0940ND