Know Your Environment. Protect Your Health.

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.

 

137

Samples

0

Samples exceeding legal limit (MCL)

114

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.454 ppb3220ND - 1.20 ppb
20190.812 ppb3228ND - 2.00 ppb
20200.863 ppb16160.470 ppb - 1.60 ppb
20210.728 ppb1613ND - 1.50 ppb
20220.881 ppb1614ND - 1.50 ppb
20230.868 ppb2523ND - 1.50 ppb

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 0.4 ppb

The EWG Health Guideline of 0.4 ppb for chloroform was based on the California Office of Environmental Health Hazard Assessment's public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer and harm to fetal growth and development.

ppb = parts per billion

All test results

Date Lab ID Result
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
2020-02-26355338580010.470 ppb
2020-02-26355338580020.470 ppb
2020-02-26355338580030.620 ppb
2020-02-26355338580040.520 ppb
2020-05-11355500400011.20 ppb
2020-05-11355500400020.700 ppb
2020-05-11355500400031.10 ppb
2020-05-11355500400040.910 ppb
2020-08-20355724750010.860 ppb
2020-08-20355724750020.620 ppb
2020-08-20355724750031.60 ppb
2020-08-20355724750040.870 ppb
2020-11-06355904610011.30 ppb
2020-11-06355904610020.780 ppb
2020-11-06355904610030.950 ppb
2020-11-06355904610040.840 ppb
2021-02-22356150310010.450 ppb
2021-02-2235615031002ND
2021-02-2235615031003ND
2021-02-2235615031004ND
2021-05-24356369070011.10 ppb
2021-05-24356369070020.540 ppb
2021-05-24356369070030.470 ppb
2021-05-24356369070041.10 ppb
2021-08-02356539540011.30 ppb
2021-08-02356539540020.830 ppb
2021-08-02356539540031.50 ppb
2021-08-02356539540041.20 ppb
2021-11-23356800030011.10 ppb
2021-11-23356800030020.610 ppb
2021-11-23356800030030.630 ppb
2021-11-23356800030040.810 ppb
2022-02-16356984590010.590 ppb
2022-02-1635698459002ND
2022-02-16356984590030.580 ppb
2022-02-16356984590040.470 ppb
2022-05-18357202500011.50 ppb
2022-05-1835720250002ND
2022-05-18357202500031.50 ppb
2022-05-18357202500041.20 ppb
2022-08-16357415280011.40 ppb
2022-08-16357415280020.680 ppb
2022-08-16357415280031.30 ppb
2022-08-16357415280041.10 ppb
2022-11-04357581890011.50 ppb
2022-11-04357581890020.730 ppb
2022-11-04357581890030.820 ppb
2022-11-04357581890040.730 ppb
2023-02-13357806910010.770 ppb
2023-02-13357806910020.510 ppb
2023-02-13357806910030.620 ppb
2023-02-13357806910040.850 ppb
2023-05-24358026160011.10 ppb
2023-05-24358026160020.540 ppb
2023-05-24358026160031.50 ppb
2023-05-24358026160040.950 ppb
2023-06-06358053020041.20 ppb
2023-08-16358222900011.10 ppb
2023-08-16358222900020.590 ppb
2023-08-16358222900031.40 ppb
2023-08-16358222900040.920 ppb
2023-08-25358235100010.950 ppb
2023-08-25358235100020.470 ppb
2023-08-25358235100031.000 ppb
2023-08-25358235100041.20 ppb
2023-11-21358433780011.10 ppb
2023-11-2135843378002ND
2023-11-21358433780030.890 ppb
2023-11-21358433780040.970 ppb
2023-11-28358448840011.20 ppb
2023-11-2835844884002ND
2023-11-28358448840030.970 ppb
2023-11-28358448840040.900 ppb