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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Huntington Park 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

 

127

Samples

0

Samples exceeding legal limit (MCL)

73

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20146.48 ppb2112ND - 18.7 ppb
20158.50 ppb2216ND - 22.0 ppb
20166.69 ppb2115ND - 19.7 ppb
20171.56 ppb225ND - 14.0 ppb
20181.65 ppb2211ND - 6.00 ppb
20194.37 ppb1914ND - 12.3 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
2014-03-053761-800-11315.60 ppb
2014-03-053761-801-10244.30 ppb
2014-03-053761-802-11199.90 ppb
2014-03-053761-803-11457.70 ppb
2014-04-019588-004-0948ND
2014-04-019588-005-1002ND
2014-04-019588-006-1018ND
2014-04-019588-010-1041ND
2014-04-289588-007-1015ND
2014-06-043761-800-10149.70 ppb
2014-06-043761-801-104318.7 ppb
2014-06-043761-802-111118.3 ppb
2014-06-043761-803-112514.7 ppb
2014-09-033761-800-1056ND
2014-09-033761-801-1010ND
2014-09-033761-802-1041ND
2014-09-033761-803-1109ND
2014-12-033761-800-112311.0 ppb
2014-12-033761-801-101712.5 ppb
2014-12-033761-802-104212.1 ppb
2014-12-033761-803-113011.5 ppb
2015-02-249588-006-0950ND
2015-03-043761-800-10286.50 ppb
2015-03-043761-801-10539.00 ppb
2015-03-043761-802-11258.90 ppb
2015-03-043761-803-10177.20 ppb
2015-04-079588-004-1040ND
2015-04-079588-005-1107ND
2015-04-079588-006-1126ND
2015-04-079588-007-1026ND
2015-04-079588-010-0951ND
2015-06-033761-800-11459.70 ppb
2015-06-033761-801-121014.1 ppb
2015-06-033761-802-115814.4 ppb
2015-06-033761-803-112510.8 ppb
2015-09-023761-800-113915.1 ppb
2015-09-023761-801-104022.0 ppb
2015-09-023761-802-111820.2 ppb
2015-09-023761-803-115915.6 ppb
2015-12-023761-800-11087.60 ppb
2015-12-023761-801-09438.60 ppb
2015-12-023761-802-11408.70 ppb
2015-12-023761-803-11258.70 ppb
2016-03-023761-800-10405.10 ppb
2016-03-023761-801-10234.90 ppb
2016-03-023761-802-11304.50 ppb
2016-03-023761-803-11034.30 ppb
2016-04-059588-004-0000ND
2016-04-059588-006-1021ND
2016-04-059588-007-0942ND
2016-04-059588-010-0928ND
2016-06-083761-800-09468.60 ppb
2016-06-083761-801-11299.70 ppb
2016-06-083761-802-114110.00 ppb
2016-06-083761-803-09339.90 ppb
2016-06-299588-005-0900ND
2016-09-073761-800-100816.8 ppb
2016-09-073761-801-111819.7 ppb
2016-09-073761-802-095417.5 ppb
2016-09-073761-803-093716.2 ppb
2016-12-073761-800-10342.30 ppb
2016-12-073761-801-10025.50 ppb
2016-12-073761-802-09425.40 ppb
2016-12-073761-803-1042ND
2017-03-013761-800-10353.30 ppb
2017-03-013761-801-10168.60 ppb
2017-03-013761-802-093014.0 ppb
2017-03-013761-803-11007.20 ppb
2017-04-249588-004-0955ND
2017-04-249588-005-0936ND
2017-04-249588-007-0946ND
2017-04-249588-010-0926ND
2017-05-319588-006-0900ND
2017-06-073761-800-1135ND
2017-06-073761-801-08581.20 ppb
2017-06-073761-802-1125ND
2017-06-073761-803-0924ND
2017-07-079588-006-1030ND
2017-09-063761-800-0912ND
2017-09-063761-801-1002ND
2017-09-063761-802-0941ND
2017-09-063761-803-0900ND
2017-12-063761-800-1013ND
2017-12-063761-801-1054ND
2017-12-063761-802-0925ND
2017-12-063761-803-1000ND
2018-03-073761-800-1219ND
2018-03-073761-801-11312.20 ppb
2018-03-073761-802-11472.10 ppb
2018-03-073761-803-12091.20 ppb
2018-04-039588-004-1000ND
2018-04-039588-007-0948ND
2018-04-039588-010-0934ND
2018-04-269588-005-0940ND
2018-05-229588-006-0850ND
2018-06-063761-800-11411.10 ppb
2018-06-063761-801-1045ND
2018-06-063761-802-1111ND
2018-06-063761-803-1200ND
2018-07-109588-006-1135ND
2018-09-053761-800-1016ND
2018-09-053761-801-09153.20 ppb
2018-09-053761-802-09435.10 ppb
2018-09-053761-803-10316.00 ppb
2018-12-053761-800-10284.70 ppb
2018-12-053761-801-08453.70 ppb
2018-12-053761-802-09443.70 ppb
2018-12-053761-803-10413.30 ppb
2019-03-063761-800-09583.40 ppb
2019-03-063761-801-08583.80 ppb
2019-03-063761-802-09313.70 ppb
2019-03-063761-803-0945ND
2019-04-029588-004-0924ND
2019-04-029588-005-0940ND
2019-04-029588-010-0900ND
2019-06-053761-800-094012.3 ppb
2019-06-053761-801-084011.1 ppb
2019-06-053761-802-092011.8 ppb
2019-06-053761-803-095811.7 ppb
2019-09-043761-800-09377.10 ppb
2019-09-043761-801-10087.70 ppb
2019-09-303761-802-09552.70 ppb
2019-09-303761-803-10103.60 ppb
2019-12-043761-800-09351.50 ppb
2019-12-043761-801-10151.40 ppb
2019-12-043761-802-08571.30 ppb
2019-12-043761-803-0922ND