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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Sands Point

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

 

142

Samples

0

Samples exceeding legal limit (MCL)

48

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.362 ppb208ND - 1.20 ppb
20150.241 ppb196ND - 0.960 ppb
20160.335 ppb234ND - 5.25 ppb
20170.251 ppb2910ND - 0.950 ppb
20180.353 ppb269ND - 2.40 ppb
20190.433 ppb2511ND - 1.90 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
2014-03-111403728-002-POCSND
2014-03-111403728-003-POCS1.20 ppb
2014-03-111403728-004-POCS0.750 ppb
2014-03-111403728-005-POCSND
2014-03-111403728-001-POCS0.570 ppb
2014-05-131405909-002-POCSND
2014-05-131405909-005-POCSND
2014-05-131405909-001-POCS0.760 ppb
2014-05-131405909-004-POCS0.830 ppb
2014-05-131405909-003-POCS1.20 ppb
2014-09-021409077-002-POCSND
2014-09-021409077-001-POCS1.000 ppb
2014-09-021409077-004-POCSND
2014-09-02140907-003-POCS0.930 ppb
2014-09-021409077-005-POCSND
2014-11-181411C18-003-POCSND
2014-11-181411C18-002-POCSND
2014-11-181411C18-005-POCSND
2014-11-181411C18-001-POCSND
2014-11-181411C18-004-POCSND
2015-03-171503B53-002-POCSND
2015-03-171503B53-004-POCS0.710 ppb
2015-03-171503B53-001-POCS0.580 ppb
2015-03-171503B53-003-POCS0.560 ppb
2015-03-171503B53-005-POCSND
2015-06-161506D36-005-POCSND
2015-06-161506D36-002-POCSND
2015-06-161506D36-004-POCSND
2015-06-161506D36-001-POCSND
2015-06-161506D36-003-POCSND
2015-09-221509H02-004-POCS0.960 ppb
2015-09-221509H02-002-POCSND
2015-09-221509H02-003-POCSND
2015-09-221509H02-001-POCSND
2015-09-221509H02-005-POCSND
2015-11-171511D82-002-POCSND
2015-11-171511D82-004-POCS0.860 ppb
2015-11-171511D82-003-POCSND
2015-11-171511D82-001-POCS0.910 ppb
2016-03-221603H56-0030.570 ppb
2016-03-221603H56-001-POCSND
2016-03-221603H56-005-POCSND
2016-03-221603H56-002ND
2016-03-221603H56-0041.05 ppb
2016-05-051605483-0045.25 ppb
2016-05-231605L07-001ND
2016-05-231605L07-004ND
2016-05-231605L07-005ND
2016-05-231605L07-003ND
2016-05-231605L07-002ND
2016-09-261609M44-003AND
2016-09-261609M44-005ND
2016-09-261609M44-003ND
2016-09-261609M44-004ND
2016-09-261609M44-001ND
2016-11-16704726002ND
2016-12-01705820003-POCND
2016-12-01705820002-POCND
2016-12-01705820005-POCSND
2016-12-01705820005ND
2016-12-01705820001-POCSND
2016-12-01705820004-POC0.830 ppb
2017-03-217013839001ND
2017-03-287014322001-POCS0.570 ppb
2017-03-287014322004ND
2017-03-287014322002AND
2017-03-287014322003ND
2017-05-117018457003-POCS0.580 ppb
2017-05-167018796001ND
2017-05-167018796004-POCSND
2017-05-167018796002-POCSND
2017-05-167018796003-POCS0.740 ppb
2017-05-167018796004ND
2017-05-167018796001-POCSND
2017-05-1670187960030.740 ppb
2017-05-167018796002ND
2017-05-187019036001ND
2017-09-257030950004-POCS0.950 ppb
2017-09-257030950001-POCS0.730 ppb
2017-09-252902852-POCS0.950 ppb
2017-09-257030950005ND
2017-09-257030950002-POCSND
2017-09-257030950003-POCSND
2017-09-25703950001-POCS0.730 ppb
2017-09-257030950006-POCSND
2017-11-147035726004-POCS0.630 ppb
2017-11-147035726003-POCSND
2017-11-147035726002-POCSND
2017-11-147035726001-POCS0.660 ppb
2017-11-147035726005-POCSND
2017-11-147035726006-POCSND
2018-03-147045332003-POCSND
2018-03-147045332006-POCSND
2018-03-147045332002-POCSND
2018-03-147045332005-POCSND
2018-03-147045332001-POCS0.590 ppb
2018-03-147045332004-POCSND
2018-05-087050974003-POCSND
2018-05-087050974002-POCSND
2018-05-087050974005-POCSND
2018-05-087050974006-POCSND
2018-05-087050974004-POCS0.680 ppb
2018-05-087050974001-POCS0.680 ppb
2018-09-1070642350012.40 ppb
2018-09-1070642350021.60 ppb
2018-09-187065159002-POCSND
2018-09-187065159004-POCS0.930 ppb
2018-09-187065159005-POCSND
2018-09-187065159006-POCSND
2018-09-187065159003-POCSND
2018-09-187065159001-POCS0.710 ppb
2018-11-287072272005-POCSND
2018-11-287072272004-POCS0.820 ppb
2018-11-287072272002-POCSND
2018-11-287072272003-POCS0.760 ppb
2018-11-287072266001-POCSND
2018-11-2870772272001-POCSND
2019-03-197082847002ND
2019-03-1970828380031.40 ppb
2019-03-197082847003ND
2019-03-1970828380020.930 ppb
2019-03-197082847001ND
2019-03-1970828380010.840 ppb
2019-06-047092017002-POCSND
2019-06-047092017005-POCSND
2019-06-047092017003-POCSND
2019-06-047092017004-POCS0.840 ppb
2019-06-047092017001-POCS0.670 ppb
2019-06-047092017006-POCSND
2019-09-09701042080011.90 ppb
2019-09-1770105251006ND
2019-09-1770105251001-POCS0.610 ppb
2019-09-1770105251003-POCSND
2019-09-1770105251002-POCSND
2019-09-1770105251005ND
2019-09-17701052510040.820 ppb
2019-12-03701139240021.10 ppb
2019-12-0370113924006ND
2019-12-0370113924005ND
2019-12-03701139240011.10 ppb
2019-12-03701139240030.620 ppb
2019-12-1770113924004ND