Chloroform
Village 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.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2018 | ND | 32 | 0 | ND |
| 2019 | 0.318 ppb | 32 | 20 | ND - 1.000 ppb |
| 2020 | 0.423 ppb | 16 | 11 | ND - 1.000 ppb |
| 2021 | 0.444 ppb | 17 | 12 | ND - 0.770 ppb |
| 2022 | 0.553 ppb | 16 | 11 | ND - 1.30 ppb |
| 2023 | 0.286 ppb | 16 | 7 | ND - 0.830 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 |
|---|---|---|
| 2018-02-12 | 35373899001 | ND |
| 2018-02-12 | 35373899002 | ND |
| 2018-02-12 | 35373899003 | ND |
| 2018-02-12 | 35373899004 | ND |
| 2018-02-12 | 35373899001 | ND |
| 2018-02-12 | 35373899002 | ND |
| 2018-02-12 | 35373899003 | ND |
| 2018-02-12 | 35373899004 | ND |
| 2018-05-10 | 35392013001 | ND |
| 2018-05-10 | 35392013002 | ND |
| 2018-05-10 | 35392013003 | ND |
| 2018-05-10 | 35392013004 | ND |
| 2018-05-10 | 35392013001 | ND |
| 2018-05-10 | 35392013002 | ND |
| 2018-05-10 | 35392013003 | ND |
| 2018-05-10 | 35392013004 | ND |
| 2018-08-15 | 35411592001 | ND |
| 2018-08-15 | 35411592002 | ND |
| 2018-08-15 | 35411592003 | ND |
| 2018-08-15 | 35411592004 | ND |
| 2018-08-15 | 35411592001 | ND |
| 2018-08-15 | 35411592002 | ND |
| 2018-08-15 | 35411592003 | ND |
| 2018-08-15 | 35411592004 | ND |
| 2018-11-16 | 35432197001 | ND |
| 2018-11-16 | 35432197002 | ND |
| 2018-11-16 | 35432197003 | ND |
| 2018-11-16 | 35432197004 | ND |
| 2018-11-16 | 35432197001 | ND |
| 2018-11-16 | 35432197002 | ND |
| 2018-11-16 | 35432197003 | ND |
| 2018-11-16 | 35432197004 | ND |
| 2019-02-21 | 35450236001 | ND |
| 2019-02-21 | 35450236002 | ND |
| 2019-02-21 | 35450236003 | ND |
| 2019-02-21 | 35450236004 | 0.440 ppb |
| 2019-02-21 | 35450236001 | ND |
| 2019-02-21 | 35450236002 | ND |
| 2019-02-21 | 35450236003 | ND |
| 2019-02-21 | 35450236004 | 0.440 ppb |
| 2019-05-17 | 35469507001 | 0.640 ppb |
| 2019-05-17 | 35469507002 | 0.440 ppb |
| 2019-05-17 | 35469507003 | ND |
| 2019-05-17 | 35469507004 | 0.710 ppb |
| 2019-05-17 | 35469507001 | 0.640 ppb |
| 2019-05-17 | 35469507002 | 0.440 ppb |
| 2019-05-17 | 35469507003 | ND |
| 2019-05-17 | 35469507004 | 0.710 ppb |
| 2019-08-23 | 35492999001 | 0.370 ppb |
| 2019-08-23 | 35492999002 | 1.000 ppb |
| 2019-08-23 | 35492999003 | 0.260 ppb |
| 2019-08-23 | 35492999004 | ND |
| 2019-08-23 | 35492999001 | 0.370 ppb |
| 2019-08-23 | 35492999002 | 1.000 ppb |
| 2019-08-23 | 35492999003 | 0.260 ppb |
| 2019-08-23 | 35492999004 | ND |
| 2019-11-14 | 35512807001 | 0.470 ppb |
| 2019-11-14 | 35512807002 | 0.300 ppb |
| 2019-11-14 | 35512807003 | ND |
| 2019-11-14 | 35512807004 | 0.450 ppb |
| 2019-11-14 | 35512807001 | 0.470 ppb |
| 2019-11-14 | 35512807002 | 0.300 ppb |
| 2019-11-14 | 35512807003 | ND |
| 2019-11-14 | 35512807004 | 0.450 ppb |
| 2020-02-24 | 35533015001 | ND |
| 2020-02-24 | 35533015002 | 0.520 ppb |
| 2020-02-24 | 35533015003 | ND |
| 2020-02-24 | 35533015004 | ND |
| 2020-05-28 | 35553251001 | 0.420 ppb |
| 2020-05-28 | 35553251002 | 0.430 ppb |
| 2020-05-28 | 35553251003 | ND |
| 2020-05-28 | 35553251004 | 0.580 ppb |
| 2020-08-11 | 35570404001 | 0.500 ppb |
| 2020-08-11 | 35570404002 | 0.920 ppb |
| 2020-08-11 | 35570404003 | 0.450 ppb |
| 2020-08-11 | 35570404004 | 0.650 ppb |
| 2020-11-05 | 35590457001 | 0.610 ppb |
| 2020-11-05 | 35590457002 | 0.680 ppb |
| 2020-11-05 | 35590457003 | ND |
| 2020-11-05 | 35590457004 | 1.000 ppb |
| 2021-02-26 | 35615306001 | ND |
| 2021-02-26 | 35615306002 | 0.530 ppb |
| 2021-02-26 | 35615306003 | ND |
| 2021-02-26 | 35615306004 | 0.500 ppb |
| 2021-05-14 | 35633835001 | 0.720 ppb |
| 2021-05-14 | 35633835002 | 0.740 ppb |
| 2021-05-14 | 35633835003 | ND |
| 2021-05-14 | 35633835004 | 0.640 ppb |
| 2021-06-10 | 35640117001 | 0.630 ppb |
| 2021-08-19 | 35657882001 | 0.770 ppb |
| 2021-08-19 | 35657882002 | 0.580 ppb |
| 2021-08-19 | 35657882003 | ND |
| 2021-08-19 | 35657882004 | 0.530 ppb |
| 2021-11-19 | 35679964001 | 0.670 ppb |
| 2021-11-19 | 35679964002 | 0.590 ppb |
| 2021-11-19 | 35679964003 | ND |
| 2021-11-19 | 35679964004 | 0.650 ppb |
| 2022-02-10 | 35696659001 | 0.490 ppb |
| 2022-02-10 | 35696659002 | 0.490 ppb |
| 2022-02-10 | 35696659003 | ND |
| 2022-02-10 | 35696659004 | 0.510 ppb |
| 2022-05-19 | 35720252001 | 1.30 ppb |
| 2022-05-19 | 35720252002 | ND |
| 2022-05-19 | 35720252003 | ND |
| 2022-05-19 | 35720252004 | ND |
| 2022-08-18 | 35741494001 | 0.810 ppb |
| 2022-08-18 | 35741494002 | 0.740 ppb |
| 2022-08-18 | 35741494003 | ND |
| 2022-08-18 | 35741494004 | 0.610 ppb |
| 2022-11-16 | 35761348001 | 0.810 ppb |
| 2022-11-16 | 35761348002 | 1.20 ppb |
| 2022-11-16 | 35761348003 | 0.790 ppb |
| 2022-11-16 | 35761348004 | 1.10 ppb |
| 2023-02-17 | 35780689001 | 0.520 ppb |
| 2023-02-17 | 35780689002 | 0.530 ppb |
| 2023-02-17 | 35780689003 | ND |
| 2023-02-17 | 35780689004 | ND |
| 2023-05-19 | 35801801001 | 0.740 ppb |
| 2023-05-19 | 35801801002 | 0.830 ppb |
| 2023-05-19 | 35801801003 | 0.500 ppb |
| 2023-05-19 | 35801801004 | 0.620 ppb |
| 2023-08-11 | 35820278001 | ND |
| 2023-08-11 | 35820278002 | ND |
| 2023-08-11 | 35820278003 | ND |
| 2023-08-11 | 35820278004 | 0.830 ppb |
| 2023-11-08 | 35840810001 | ND |
| 2023-11-08 | 35840810002 | ND |
| 2023-11-08 | 35840810003 | ND |
| 2023-11-08 | 35840810004 | ND |