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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Minden Water System

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)

106

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.0838 ppb322ND - 1.34 ppb
20150.146 ppb324ND - 1.28 ppb
20160.696 ppb3224ND - 1.42 ppb
20170.656 ppb3228ND - 1.20 ppb
20180.454 ppb3220ND - 1.20 ppb
20190.812 ppb3228ND - 2.00 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
2014-02-281281530ND
2014-02-281281531ND
2014-02-281281532ND
2014-02-281281533ND
2014-02-281281530ND
2014-02-281281531ND
2014-02-281281532ND
2014-02-281281533ND
2014-05-051298714ND
2014-05-051298716ND
2014-05-051298717ND
2014-05-051298718ND
2014-05-051298714ND
2014-05-051298716ND
2014-05-051298717ND
2014-05-051298718ND
2014-08-151326922ND
2014-08-151326923ND
2014-08-151326924ND
2014-08-151326925ND
2014-08-151326922ND
2014-08-151326923ND
2014-08-151326924ND
2014-08-151326925ND
2014-11-1413506881.34 ppb
2014-11-141350689ND
2014-11-141350690ND
2014-11-141350691ND
2014-11-1413506881.34 ppb
2014-11-141350689ND
2014-11-141350690ND
2014-11-141350691ND
2015-02-061370752ND
2015-02-061370753ND
2015-02-061370754ND
2015-02-061370755ND
2015-02-061370752ND
2015-02-061370753ND
2015-02-061370754ND
2015-02-061370755ND
2015-05-1513956961.28 ppb
2015-05-151395697ND
2015-05-151395698ND
2015-05-151395699ND
2015-05-1513956961.28 ppb
2015-05-151395697ND
2015-05-151395698ND
2015-05-151395699ND
2015-08-031415299ND
2015-08-031415301ND
2015-08-031415302ND
2015-08-031415303ND
2015-08-031415299ND
2015-08-031415301ND
2015-08-031415302ND
2015-08-031415303ND
2015-11-0214406441.05 ppb
2015-11-021440645ND
2015-11-021440646ND
2015-11-021440647ND
2015-11-0214406441.05 ppb
2015-11-021440645ND
2015-11-021440646ND
2015-11-021440647ND
2016-02-081465783ND
2016-02-081465784ND
2016-02-081465785ND
2016-02-081465786ND
2016-02-081465783ND
2016-02-081465784ND
2016-02-081465785ND
2016-02-081465786ND
2016-05-0914900651.06 ppb
2016-05-0914900660.880 ppb
2016-05-0914900671.01 ppb
2016-05-0914900680.560 ppb
2016-05-0914900651.06 ppb
2016-05-0914900660.880 ppb
2016-05-0914900671.01 ppb
2016-05-0914900680.560 ppb
2016-08-0515135851.42 ppb
2016-08-0515135861.03 ppb
2016-08-0515135870.990 ppb
2016-08-0515135880.690 ppb
2016-08-0515135851.42 ppb
2016-08-0515135861.03 ppb
2016-08-0515135870.990 ppb
2016-08-0515135880.690 ppb
2016-11-2815440081.17 ppb
2016-11-2815440091.000 ppb
2016-11-2815440100.750 ppb
2016-11-2815440110.580 ppb
2016-11-2815440081.17 ppb
2016-11-2815440091.000 ppb
2016-11-2815440100.750 ppb
2016-11-2815440110.580 ppb
2017-02-17352960860150.720 ppb
2017-02-17352960860160.430 ppb
2017-02-17352960860170.700 ppb
2017-02-17352960860180.630 ppb
2017-02-17352960860150.720 ppb
2017-02-17352960860160.430 ppb
2017-02-17352960860170.700 ppb
2017-02-17352960860180.630 ppb
2017-05-12353120270070.770 ppb
2017-05-12353120270080.510 ppb
2017-05-12353120270090.930 ppb
2017-05-12353120270100.630 ppb
2017-05-12353120270070.770 ppb
2017-05-12353120270080.510 ppb
2017-05-12353120270090.930 ppb
2017-05-12353120270100.630 ppb
2017-08-10353299500241.20 ppb
2017-08-1035329950025ND
2017-08-1035329950026ND
2017-08-10353299500270.810 ppb
2017-08-10353299500241.20 ppb
2017-08-1035329950025ND
2017-08-1035329950026ND
2017-08-10353299500270.810 ppb
2017-11-17353495220010.560 ppb
2017-11-17353495220020.810 ppb
2017-11-17353495220031.000 ppb
2017-11-17353495220040.790 ppb
2017-11-17353495220010.560 ppb
2017-11-17353495220020.810 ppb
2017-11-17353495220031.000 ppb
2017-11-17353495220040.790 ppb
2018-02-08353739720010.440 ppb
2018-02-08353739720020.480 ppb
2018-02-0835373972003ND
2018-02-08353739720040.650 ppb
2018-02-08353739720010.440 ppb
2018-02-08353739720020.480 ppb
2018-02-0835373972003ND
2018-02-08353739720040.650 ppb
2018-05-03353903130010.810 ppb
2018-05-03353903130020.470 ppb
2018-05-03353903130030.620 ppb
2018-05-03353903130040.730 ppb
2018-05-03353903130010.810 ppb
2018-05-03353903130020.470 ppb
2018-05-03353903130030.620 ppb
2018-05-03353903130040.730 ppb
2018-08-1335411591001ND
2018-08-1335411591002ND
2018-08-13354115910031.20 ppb
2018-08-13354115910040.950 ppb
2018-08-1335411591001ND
2018-08-1335411591002ND
2018-08-13354115910031.20 ppb
2018-08-13354115910040.950 ppb
2018-11-01354281910010.920 ppb
2018-11-0135428191002ND
2018-11-0135428191003ND
2018-11-0135428191004ND
2018-11-01354281910010.920 ppb
2018-11-0135428191002ND
2018-11-0135428191003ND
2018-11-0135428191004ND
2019-02-07354470570010.800 ppb
2019-02-0735447057002ND
2019-02-07354470570030.810 ppb
2019-02-0735447057004ND
2019-02-07354470570010.800 ppb
2019-02-0735447057002ND
2019-02-07354470570030.810 ppb
2019-02-0735447057004ND
2019-05-23354708450011.30 ppb
2019-05-23354708450020.790 ppb
2019-05-23354708450032.00 ppb
2019-05-23354708450041.10 ppb
2019-05-23354708450011.30 ppb
2019-05-23354708450020.790 ppb
2019-05-23354708450032.00 ppb
2019-05-23354708450041.10 ppb
2019-08-21354927570011.10 ppb
2019-08-21354927570020.620 ppb
2019-08-21354927570030.890 ppb
2019-08-21354927570040.900 ppb
2019-08-21354927570011.10 ppb
2019-08-21354927570020.620 ppb
2019-08-21354927570030.890 ppb
2019-08-21354927570040.900 ppb
2019-11-18355144600010.810 ppb
2019-11-18355144600020.610 ppb
2019-11-18355144600030.740 ppb
2019-11-18355144600040.520 ppb
2019-11-18355144600010.810 ppb
2019-11-18355144600020.610 ppb
2019-11-18355144600030.740 ppb
2019-11-18355144600040.520 ppb