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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Ventura Waterworks District No. 8 - Simi Valley

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

 

202

Samples

0

Samples exceeding legal limit (MCL)

116

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20141.22 ppb3517ND - 3.10 ppb
20152.91 ppb3427ND - 7.00 ppb
20160.572 ppb329ND - 2.80 ppb
20171.86 ppb3428ND - 4.30 ppb
20183.27 ppb3318ND - 16.0 ppb
20190.835 ppb3417ND - 2.80 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
2014-01-029588-014-0949ND
2014-01-029588-015-1105ND
2014-01-029588-016-1118ND
2014-01-029588-017-0753ND
2014-01-029588-018-0809ND
2014-01-029588-019-0834ND
2014-01-029588-020-0820ND
2014-01-029588-021-0926ND
2014-04-019588-014-09492.30 ppb
2014-04-019588-015-10352.40 ppb
2014-04-019588-016-10562.90 ppb
2014-04-019588-017-08002.70 ppb
2014-04-019588-018-08182.60 ppb
2014-04-019588-019-09052.40 ppb
2014-04-019588-020-08523.00 ppb
2014-04-019588-021-09263.10 ppb
2014-04-159588-013-1227ND
2014-04-309588-011-1215ND
2014-05-209588-012-0922ND
2014-07-019588-014-10202.30 ppb
2014-07-019588-015-10502.50 ppb
2014-07-019588-016-09403.10 ppb
2014-07-019588-017-08502.30 ppb
2014-07-019588-018-09102.40 ppb
2014-07-019588-019-09302.60 ppb
2014-07-019588-020-09202.30 ppb
2014-07-019588-021-10002.60 ppb
2014-09-239588-014-0825ND
2014-09-239588-015-0850ND
2014-09-239588-016-0842ND
2014-09-239588-017-0743ND
2014-09-239588-018-07591.10 ppb
2014-09-239588-019-0828ND
2014-09-239588-020-0815ND
2014-09-239588-021-0805ND
2015-01-069588-014-09253.20 ppb
2015-01-069588-015-1033ND
2015-01-069588-016-1020ND
2015-01-069588-017-0815ND
2015-01-069588-018-0830ND
2015-01-069588-019-08553.50 ppb
2015-01-069588-020-0845ND
2015-01-069588-021-09121.40 ppb
2015-04-079588-014-14182.90 ppb
2015-04-079588-015-14552.70 ppb
2015-04-079588-016-15152.80 ppb
2015-04-079588-017-13103.60 ppb
2015-04-079588-018-13203.30 ppb
2015-04-079588-019-13402.70 ppb
2015-04-079588-020-13322.80 ppb
2015-04-079588-021-13582.90 ppb
2015-06-029588-011-0915ND
2015-07-079588-014-09253.40 ppb
2015-07-079588-015-09552.20 ppb
2015-07-079588-016-10103.50 ppb
2015-07-079588-017-07453.30 ppb
2015-07-079588-018-08003.30 ppb
2015-07-079588-019-08302.30 ppb
2015-07-079588-020-08152.90 ppb
2015-07-079588-021-09002.20 ppb
2015-07-219588-007-1450ND
2015-10-069588-014-10436.60 ppb
2015-10-069588-015-11524.10 ppb
2015-10-069588-016-09527.00 ppb
2015-10-069588-017-08036.20 ppb
2015-10-069588-018-08185.10 ppb
2015-10-069588-019-09204.10 ppb
2015-10-069588-020-08556.40 ppb
2015-10-069588-021-10224.50 ppb
2016-01-059588-014-1020ND
2016-01-059588-015-1105ND
2016-01-059588-016-1115ND
2016-01-059588-017-08501.40 ppb
2016-01-059588-018-0910ND
2016-01-059588-019-0945ND
2016-01-059588-020-0933ND
2016-01-059588-021-1000ND
2016-04-059588-014-0920ND
2016-04-059588-015-1000ND
2016-04-059588-016-0945ND
2016-04-059588-017-0805ND
2016-04-059588-018-0820ND
2016-04-059588-019-0840ND
2016-04-059588-020-0830ND
2016-04-059588-021-0905ND
2016-07-059588-014-0922ND
2016-07-059588-015-1030ND
2016-07-059588-016-0930ND
2016-07-059588-017-0755ND
2016-07-059588-018-0818ND
2016-07-059588-019-0844ND
2016-07-059588-020-0833ND
2016-07-059588-021-0905ND
2016-10-069588-014-10101.90 ppb
2016-10-069588-015-10302.00 ppb
2016-10-069588-016-10452.40 ppb
2016-10-069588-017-08462.00 ppb
2016-10-069588-018-08581.90 ppb
2016-10-069588-019-09302.00 ppb
2016-10-069588-020-09202.80 ppb
2016-10-069588-021-09501.90 ppb
2017-01-049588-014-10001.000 ppb
2017-01-049588-015-10241.70 ppb
2017-01-049588-016-10482.00 ppb
2017-01-049588-017-08221.90 ppb
2017-01-049588-018-08501.70 ppb
2017-01-049588-019-09141.40 ppb
2017-01-049588-020-09001.20 ppb
2017-01-049588-021-09411.50 ppb
2017-04-049588-014-09373.80 ppb
2017-04-049588-015-10143.90 ppb
2017-04-049588-016-10534.30 ppb
2017-04-049588-017-10533.90 ppb
2017-04-049588-018-08323.90 ppb
2017-04-049588-019-08582.90 ppb
2017-04-049588-020-08483.50 ppb
2017-04-049588-021-09194.30 ppb
2017-05-039588-013-1445ND
2017-07-059588-014-1035ND
2017-07-059588-015-1103ND
2017-07-059588-016-11201.20 ppb
2017-07-059588-017-08301.10 ppb
2017-07-059588-018-08541.10 ppb
2017-07-059588-019-0930ND
2017-07-059588-020-0915ND
2017-07-059588-021-1010ND
2017-10-049588-014-15142.20 ppb
2017-10-049588-015-15442.00 ppb
2017-10-049588-016-15552.40 ppb
2017-10-049588-017-13501.70 ppb
2017-10-049588-018-14072.10 ppb
2017-10-049588-019-14331.50 ppb
2017-10-049588-020-14201.80 ppb
2017-10-049588-021-14562.00 ppb
2017-12-219588-011-14301.40 ppb
2018-01-109588-014-11352.20 ppb
2018-01-109588-015-13101.70 ppb
2018-01-109588-016-12451.60 ppb
2018-01-109588-017-08231.40 ppb
2018-01-109588-018-08542.10 ppb
2018-01-109588-019-10001.40 ppb
2018-01-109588-020-09302.50 ppb
2018-01-109588-021-1055ND
2018-04-049588-014-08567.60 ppb
2018-04-049588-015-095213.0 ppb
2018-04-049588-016-103516.0 ppb
2018-04-049588-017-113812.0 ppb
2018-04-049588-018-112312.0 ppb
2018-04-049588-019-10498.30 ppb
2018-04-049588-020-11018.60 ppb
2018-04-049588-021-093114.0 ppb
2018-07-039588-014-0930ND
2018-07-039588-015-1000ND
2018-07-039588-016-10151.30 ppb
2018-07-039588-017-08151.000 ppb
2018-07-039588-018-08301.10 ppb
2018-07-039588-019-0855ND
2018-07-039588-020-0840ND
2018-07-039588-021-0915ND
2018-10-049588-014-1038ND
2018-10-049588-015-1121ND
2018-10-049588-016-1200ND
2018-10-049588-017-0800ND
2018-10-049588-018-0820ND
2018-10-049588-019-0915ND
2018-10-049588-020-0845ND
2018-10-049588-021-0940ND
2018-12-199588-011-1118ND
2019-01-029588-014-1001ND
2019-01-029588-015-1042ND
2019-01-029588-016-1033ND
2019-01-029588-017-0900ND
2019-01-029588-018-0915ND
2019-01-029588-019-0935ND
2019-01-029588-020-0925ND
2019-01-029588-021-0955ND
2019-04-049588-014-10502.60 ppb
2019-04-049588-015-11201.20 ppb
2019-04-049588-016-11401.000 ppb
2019-04-049588-017-08301.10 ppb
2019-04-049588-018-0915ND
2019-04-049588-019-10001.40 ppb
2019-04-049588-020-09402.80 ppb
2019-04-049588-021-10301.30 ppb
2019-07-119588-014-11121.80 ppb
2019-07-119588-015-11401.10 ppb
2019-07-119588-016-1155ND
2019-07-119588-017-09482.60 ppb
2019-07-119588-018-10152.50 ppb
2019-07-119588-019-10351.40 ppb
2019-07-119588-020-10222.70 ppb
2019-07-119588-021-1052ND
2019-10-029588-014-10451.20 ppb
2019-10-029588-015-1115ND
2019-10-029588-016-1140ND
2019-10-029588-017-08271.10 ppb
2019-10-029588-018-08501.20 ppb
2019-10-029588-019-0945ND
2019-10-029588-020-0915ND
2019-10-029588-021-10151.40 ppb
2019-12-099588-007-1330ND
2019-12-099588-011-1255ND