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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Oxnard 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

 

175

Samples

0

Samples exceeding legal limit (MCL)

51

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.220 ppb51ND - 1.10 ppb
20152.35 ppb2417ND - 6.20 ppb
20160.220 ppb355ND - 1.80 ppb
20170.386 ppb3511ND - 1.60 ppb
20180.869 ppb3514ND - 4.00 ppb
20190.0854 ppb413ND - 1.30 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
2014-11-199588-018-0831ND
2014-11-199588-035-1014ND
2014-11-199588-036-09581.10 ppb
2014-11-199588-037-1021ND
2014-11-199588-040-0800ND
2015-04-159588-057-10181.60 ppb
2015-04-159588-058-1225ND
2015-04-159588-059-1207ND
2015-04-159588-060-10001.60 ppb
2015-04-159588-061-1157ND
2015-04-159588-062-1146ND
2015-04-159588-063-11301.60 ppb
2015-04-159588-064-10331.80 ppb
2015-06-299588-057-10383.20 ppb
2015-06-299588-058-12183.60 ppb
2015-06-299588-059-11493.60 ppb
2015-06-299588-060-10023.40 ppb
2015-06-299588-061-11373.60 ppb
2015-06-299588-062-10243.50 ppb
2015-06-299588-063-09542.50 ppb
2015-06-309588-064-09292.20 ppb
2015-10-289588-057-09585.20 ppb
2015-10-289588-058-11534.90 ppb
2015-10-289588-059-1123ND
2015-10-289588-060-09206.20 ppb
2015-10-289588-061-1108ND
2015-10-289588-062-1055ND
2015-10-289588-063-10353.40 ppb
2015-10-289588-064-10154.40 ppb
2016-01-139588-057-1000ND
2016-01-139588-058-1152ND
2016-01-139588-059-1133ND
2016-01-139588-060-0934ND
2016-01-139588-061-1120ND
2016-01-139588-062-1108ND
2016-01-139588-063-1049ND
2016-01-139588-064-1018ND
2016-03-039588-020-0000ND
2016-03-039588-039-0907ND
2016-03-179588-035-0917ND
2016-03-179588-038-10071.80 ppb
2016-03-229588-040-0855ND
2016-03-229588-041-0943ND
2016-04-139588-057-1023ND
2016-04-139588-058-1218ND
2016-04-139588-059-1157ND
2016-04-139588-060-1001ND
2016-04-139588-061-1142ND
2016-04-139588-062-1130ND
2016-04-139588-063-1108ND
2016-07-139588-057-0927ND
2016-07-139588-058-1145ND
2016-07-139588-059-1125ND
2016-07-139588-060-0903ND
2016-07-139588-061-1114ND
2016-07-139588-062-1049ND
2016-07-139588-063-1030ND
2016-10-129588-057-10441.50 ppb
2016-10-129588-058-12361.70 ppb
2016-10-129588-059-1217ND
2016-10-129588-060-10231.60 ppb
2016-10-129588-061-1205ND
2016-10-129588-062-1150ND
2016-10-129588-063-11331.10 ppb
2017-01-109588-057-08551.20 ppb
2017-01-109588-058-10511.60 ppb
2017-01-109588-059-1029ND
2017-01-109588-060-08341.30 ppb
2017-01-109588-061-1017ND
2017-01-109588-062-1003ND
2017-01-109588-063-09421.40 ppb
2017-04-129588-057-09501.10 ppb
2017-04-129588-058-11521.30 ppb
2017-04-129588-059-1127ND
2017-04-129588-060-09271.30 ppb
2017-04-129588-061-1115ND
2017-04-129588-062-1100ND
2017-04-129588-063-1042ND
2017-06-299588-018-0830ND
2017-07-129588-057-0910ND
2017-07-129588-058-1116ND
2017-07-129588-059-1055ND
2017-07-129588-060-0849ND
2017-07-129588-061-1043ND
2017-07-129588-062-1031ND
2017-07-129588-063-1005ND
2017-07-199588-037-0847ND
2017-08-099588-057-1020ND
2017-08-099588-060-0850ND
2017-08-169588-059-1055ND
2017-08-169588-063-1005ND
2017-10-119588-057-10451.000 ppb
2017-10-119588-058-12451.20 ppb
2017-10-119588-059-1215ND
2017-10-119588-060-10241.000 ppb
2017-10-119588-061-1202ND
2017-10-119588-062-1147ND
2017-10-119588-063-1126ND
2017-10-119588-066-11081.10 ppb
2018-01-109588-057-10452.10 ppb
2018-01-109588-058-12452.20 ppb
2018-01-109588-059-1215ND
2018-01-109588-060-10241.60 ppb
2018-01-109588-061-1202ND
2018-01-109588-062-1147ND
2018-01-109588-063-11261.10 ppb
2018-01-109588-066-11081.40 ppb
2018-04-119588-057-10352.50 ppb
2018-04-119588-058-12552.40 ppb
2018-04-119588-059-12302.70 ppb
2018-04-119588-060-10054.00 ppb
2018-04-119588-061-12182.50 ppb
2018-04-119588-062-12072.00 ppb
2018-04-119588-063-11403.10 ppb
2018-07-119588-057-1100ND
2018-07-119588-058-1310ND
2018-07-119588-059-1242ND
2018-07-119588-060-1031ND
2018-07-119588-061-1225ND
2018-07-119588-062-1207ND
2018-07-119588-063-1144ND
2018-07-119588-066-1119ND
2018-10-099588-057-1112ND
2018-10-099588-058-1350ND
2018-10-099588-059-1326ND
2018-10-099588-060-1050ND
2018-10-099588-061-1311ND
2018-10-099588-062-1250ND
2018-10-099588-063-1230ND
2018-10-099588-066-1141ND
2018-11-149588-057-10201.30 ppb
2018-11-149588-060-09341.50 ppb
2018-11-219588-063-0944ND
2018-11-289588-059-1056ND
2019-01-239588-057-1048ND
2019-01-239588-058-1248ND
2019-01-239588-059-1254ND
2019-01-239588-060-1019ND
2019-01-239588-061-1205ND
2019-01-239588-062-1143ND
2019-01-239588-063-1127ND
2019-04-109588-057-0930ND
2019-04-109588-058-1140ND
2019-04-109588-059-1115ND
2019-04-109588-060-0903ND
2019-04-109588-061-1102ND
2019-04-109588-062-1050ND
2019-04-109588-063-1007ND
2019-04-109588-066-1031ND
2019-04-179588-018-0810ND
2019-04-179588-020-0929ND
2019-04-179588-041-1040ND
2019-04-249588-039-1134ND
2019-05-019588-036-1044ND
2019-05-159588-040-1130ND
2019-06-199588-035-1028ND
2019-06-269588-038-1002ND
2019-07-109588-057-1005ND
2019-07-109588-058-1229ND
2019-07-109588-059-1203ND
2019-07-109588-060-0935ND
2019-07-109588-061-1146ND
2019-07-109588-062-1130ND
2019-07-109588-063-1108ND
2019-07-179588-021-1247ND
2019-09-189588-059-1107ND
2019-10-029588-057-1144ND
2019-10-029588-058-10161.10 ppb
2019-10-029588-059-0951ND
2019-10-029588-060-1120ND
2019-10-029588-061-0936ND
2019-10-029588-062-0920ND
2019-10-029588-063-1222ND
2019-10-169588-057-11121.30 ppb
2019-11-209588-057-11241.10 ppb