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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Davidson Water Inc.

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

 

192

Samples

0

Samples exceeding legal limit (MCL)

192

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201428.6 ppb32329.00 ppb - 61.3 ppb
201532.7 ppb32328.70 ppb - 81.0 ppb
201631.5 ppb32327.10 ppb - 75.6 ppb
201728.5 ppb32329.52 ppb - 57.9 ppb
201828.6 ppb32326.70 ppb - 71.7 ppb
201926.4 ppb32326.47 ppb - 60.7 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
2014-02-03777937T13.8 ppb
2014-02-03777938T20.0 ppb
2014-02-03777939T16.2 ppb
2014-02-03777940T12.8 ppb
2014-02-03777941T9.00 ppb
2014-02-03777942T15.9 ppb
2014-02-03777943T13.2 ppb
2014-02-03777944T13.8 ppb
2014-05-06784626T32.0 ppb
2014-05-06784627T31.7 ppb
2014-05-06784628T32.5 ppb
2014-05-06784629T61.3 ppb
2014-05-06784630T21.0 ppb
2014-05-06784631T24.0 ppb
2014-05-06784632T31.0 ppb
2014-05-06784633T24.8 ppb
2014-08-05791674T35.0 ppb
2014-08-05791675T41.5 ppb
2014-08-05791676T47.8 ppb
2014-08-05791677T28.7 ppb
2014-08-05791678T24.8 ppb
2014-08-05791679T34.2 ppb
2014-08-05791680T41.8 ppb
2014-08-05791681T34.9 ppb
2014-11-03798791T29.2 ppb
2014-11-03798792T37.8 ppb
2014-11-03798793T42.6 ppb
2014-11-03798796T29.9 ppb
2014-11-03798795T22.4 ppb
2014-11-04798794T26.4 ppb
2014-11-04798797T29.6 ppb
2014-11-04798798T35.6 ppb
2015-02-0215.8 ppb
2015-02-0212.5 ppb
2015-02-028.70 ppb
2015-02-0311.5 ppb
2015-02-0318.2 ppb
2015-02-0312.3 ppb
2015-02-0313.6 ppb
2015-02-0315.8 ppb
2015-05-0422.0 ppb
2015-05-0427.0 ppb
2015-05-0430.0 ppb
2015-05-0427.0 ppb
2015-05-0420.0 ppb
2015-05-0419.0 ppb
2015-05-0421.0 ppb
2015-05-0423.0 ppb
2015-08-0456.0 ppb
2015-08-0474.0 ppb
2015-08-0481.0 ppb
2015-08-0463.0 ppb
2015-08-0439.0 ppb
2015-08-0450.0 ppb
2015-08-0463.0 ppb
2015-08-0456.0 ppb
2015-11-0332.0 ppb
2015-11-0340.0 ppb
2015-11-0339.0 ppb
2015-11-0348.0 ppb
2015-11-0319.0 ppb
2015-11-0329.0 ppb
2015-11-0332.0 ppb
2015-11-0328.0 ppb
2016-02-03339535812.0 ppb
2016-02-03339535913.0 ppb
2016-02-03339536013.0 ppb
2016-02-03339536116.0 ppb
2016-02-0333953627.10 ppb
2016-02-03339536311.0 ppb
2016-02-0333953647.30 ppb
2016-02-0333953658.10 ppb
2016-05-02344023444.0 ppb
2016-05-02344023523.0 ppb
2016-05-02344023628.0 ppb
2016-05-02344023724.0 ppb
2016-05-02344023817.0 ppb
2016-05-02344023922.0 ppb
2016-05-02344024022.0 ppb
2016-05-02344024122.0 ppb
2016-08-0137729_16-2607654.2 ppb
2016-08-0237729_16-2606964.3 ppb
2016-08-0237729_16-2607065.6 ppb
2016-08-0237729_16-2607175.6 ppb
2016-08-0237729_16-2607246.7 ppb
2016-08-0237729_16-2607342.1 ppb
2016-08-0237729_16-2607471.9 ppb
2016-08-0237729_16-2607558.5 ppb
2016-11-0837729_16-3909834.1 ppb
2016-11-0837729_16-3909937.4 ppb
2016-11-0837729_16-3910042.6 ppb
2016-11-0837729_16-3910131.5 ppb
2016-11-0837729_16-3910219.4 ppb
2016-11-0837729_16-3910327.1 ppb
2016-11-0837729_16-3910423.3 ppb
2016-11-0837729_16-3910525.6 ppb
2017-02-0637729_17-0450214.3 ppb
2017-02-0637729_17-0450320.1 ppb
2017-02-0637729_17-0450420.2 ppb
2017-02-0637729_17-0450518.3 ppb
2017-02-0637729_17-0450610.1 ppb
2017-02-0637729_17-0450711.4 ppb
2017-02-0637729_17-045089.52 ppb
2017-02-0637729_17-0450911.1 ppb
2017-05-0237729_17-1490926.7 ppb
2017-05-0237729_17-1491041.1 ppb
2017-05-0237729_17-1491141.8 ppb
2017-05-0237729_17-1491241.1 ppb
2017-05-0237729_17-1491327.0 ppb
2017-05-0237729_17-1491429.0 ppb
2017-05-0237729_17-1491530.2 ppb
2017-05-0237729_17-1491625.2 ppb
2017-08-0737729_17-2814031.9 ppb
2017-08-0737729_17-2814138.0 ppb
2017-08-0737729_17-2814257.9 ppb
2017-08-0737729_17-2814327.5 ppb
2017-08-0737729_17-2814431.9 ppb
2017-08-0737729_17-2814557.3 ppb
2017-08-0737729_17-2814628.3 ppb
2017-08-0737729_17-2814726.4 ppb
2017-11-0637729_17-4220125.3 ppb
2017-11-0637729_17-4220233.1 ppb
2017-11-0637729_17-4220343.4 ppb
2017-11-0637729_17-4220431.8 ppb
2017-11-0637729_17-4220517.9 ppb
2017-11-0637729_17-4220643.1 ppb
2017-11-0637729_17-4220718.7 ppb
2017-11-0637729_17-4220821.4 ppb
2018-02-0637729_18-05464 12.5 ppb
2018-02-0637729_18-05465 12.1 ppb
2018-02-0637729_18-05466 16.5 ppb
2018-02-0637729_18-05467 12.9 ppb
2018-02-0637729_18-05468 7.78 ppb
2018-02-0637729_18-05469 12.5 ppb
2018-02-0637729_18-05470 6.70 ppb
2018-02-0637729_18-05471 7.94 ppb
2018-05-0837729_18-18189 28.4 ppb
2018-05-0837729_18-18190 31.1 ppb
2018-05-0837729_18-18191 44.5 ppb
2018-05-0837729_18-18192 40.8 ppb
2018-05-0837729_18-18193 28.5 ppb
2018-05-0837729_18-18194 38.8 ppb
2018-05-0837729_18-18195 25.3 ppb
2018-05-0837729_18-18196 22.4 ppb
2018-08-0837729_18-32777 34.3 ppb
2018-08-0837729_18-32778 47.7 ppb
2018-08-0837729_18-32779 71.7 ppb
2018-08-0837729_18-32780 39.4 ppb
2018-08-0837729_18-32781 29.8 ppb
2018-08-0837729_18-32782 63.0 ppb
2018-08-0837729_18-32783 27.7 ppb
2018-08-0837729_18-32784 23.9 ppb
2018-11-0637729_18-46674 45.0 ppb
2018-11-0637729_18-46675 36.0 ppb
2018-11-0637729_18-46676 31.0 ppb
2018-11-0637729_18-46677 18.0 ppb
2018-11-0637729_18-46678 13.0 ppb
2018-11-0637729_18-46679 46.0 ppb
2018-11-0637729_18-46680 21.0 ppb
2018-11-0637729_18-46681 18.0 ppb
2019-02-0637729_19-05682 11.2 ppb
2019-02-0637729_19-05693 14.3 ppb
2019-02-0637729_19-05694 10.5 ppb
2019-02-0637729_19-05695 19.6 ppb
2019-02-0637729_19-05696 7.54 ppb
2019-02-0637729_19-05697 12.8 ppb
2019-02-0637729_19-05698 8.01 ppb
2019-02-0637729_19-05699 6.47 ppb
2019-05-0737729_19-18790 28.0 ppb
2019-05-0737729_19-18791 37.3 ppb
2019-05-0737729_19-18792 32.2 ppb
2019-05-0737729_19-18793 37.7 ppb
2019-05-0737729_19-18794 22.2 ppb
2019-05-0737729_19-18795 38.1 ppb
2019-05-0737729_19-18796 26.1 ppb
2019-05-0737729_19-18797 23.8 ppb
2019-08-0637729_19-33836 20.4 ppb
2019-08-0637729_19-33837 45.5 ppb
2019-08-0637729_19-33838 60.7 ppb
2019-08-0637729_19-33839 36.4 ppb
2019-08-0637729_19-33840 45.3 ppb
2019-08-0637729_19-33841 43.0 ppb
2019-08-0637729_19-33842 34.3 ppb
2019-08-0637729_19-33843 33.3 ppb
2019-11-0537729_19-47816 24.4 ppb
2019-11-0537729_19-47817 20.1 ppb
2019-11-0537729_19-47818 24.2 ppb
2019-11-0537729_19-47819 29.7 ppb
2019-11-0537729_19-47820 23.4 ppb
2019-11-0537729_19-47821 26.6 ppb
2019-11-0537729_19-47822 19.2 ppb
2019-11-0537729_19-47823 23.8 ppb