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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Camino Real Regional Utility Authority

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

 

93

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND170ND
2015ND120ND
2016ND160ND
20170.0506 ppb163ND - 0.400 ppb
2018ND160ND
2019ND160ND

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
2014-03-121403726-003AND
2014-03-121403726-002AND
2014-03-121403726-005AND
2014-03-121403726-004AND
2014-03-121403726-001AND
2014-04-141404657-001AND
2014-04-141404660-001AND
2014-04-141404659-001AND
2014-04-141404658-001AND
2014-07-081407377-001AND
2014-07-081407379-001AND
2014-07-081407381-001AND
2014-07-081407380-001AND
2014-10-201410939-001AND
2014-12-101412549-001AND
2014-12-101412551-001AND
2014-12-101412540-001AND
2015-02-101502469-001AND
2015-02-101502468-001AND
2015-02-101502458-001AND
2015-02-101502467-001AND
2015-07-292015021804ND
2015-07-292015021806ND
2015-07-292015021803ND
2015-07-292015021805ND
2015-10-132015030913ND
2015-10-132015030914ND
2015-10-132015030911ND
2015-10-132015030912ND
2016-01-262016002415ND
2016-01-262016002414ND
2016-01-262016002413ND
2016-01-262016002412ND
2016-05-042016012626ND
2016-05-042016012623ND
2016-05-042016012624ND
2016-05-042016012625ND
2016-07-132016020158ND
2016-07-132016020160ND
2016-07-132016020161ND
2016-07-132016020159ND
2016-10-062016029356ND
2016-10-062016029357ND
2016-10-062016029358ND
2016-10-062016029355ND
2017-01-052017000486ND
2017-01-0520170004890.190 ppb
2017-01-0520170004880.400 ppb
2017-01-052017000487ND
2017-04-1220170108890.220 ppb
2017-04-122017010888ND
2017-04-122017010887ND
2017-04-122017010886ND
2017-07-122017020031ND
2017-07-122017020034ND
2017-07-122017020033ND
2017-07-122017020032ND
2017-10-232017030620ND
2017-10-232017030621ND
2017-10-232017030622ND
2017-10-232017030623ND
2018-01-232018002292ND
2018-01-232018002291ND
2018-01-232018002290ND
2018-01-232018002289ND
2018-04-252018011476ND
2018-04-252018011473ND
2018-04-252018011474ND
2018-04-252018011475ND
2018-07-182018019825ND
2018-07-182018019824ND
2018-07-182018019823ND
2018-07-182018019822ND
2018-10-222018030060ND
2018-10-222018030061ND
2018-10-222018030062ND
2018-10-222018030063ND
2019-01-162019001469ND
2019-01-162019001470ND
2019-01-162019001471ND
2019-01-162019001472ND
2019-04-172019009806ND
2019-04-172019009809ND
2019-04-172019009808ND
2019-04-172019009807ND
2019-07-022019018237ND
2019-07-022019018239ND
2019-07-022019018238ND
2019-07-022019018236ND
2019-10-022019028215ND
2019-10-022019028214ND
2019-10-022019028213ND
2019-10-022019028212ND