Chloroform
Fort Johnson South 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 | 0.410 ppb | 4 | 2 | ND - 0.820 ppb |
| 2019 | 0.830 ppb | 4 | 4 | 0.780 ppb - 0.880 ppb |
| 2020 | 0.615 ppb | 2 | 2 | 0.540 ppb - 0.690 ppb |
| 2021 | 0.942 ppb | 6 | 6 | 0.600 ppb - 1.20 ppb |
| 2022 | 1.04 ppb | 16 | 15 | ND - 2.40 ppb |
| 2023 | 0.935 ppb | 16 | 14 | ND - 2.00 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 |
|---|---|---|
| 2018-07-25 | 35407305001 | 0.820 ppb |
| 2018-07-25 | 35407305002 | ND |
| 2018-07-25 | 35407305001 | 0.820 ppb |
| 2018-07-25 | 35407305002 | ND |
| 2019-07-25 | 35485195002 | 0.780 ppb |
| 2019-07-25 | 35485195001 | 0.880 ppb |
| 2019-07-25 | 35485195002 | 0.780 ppb |
| 2019-07-25 | 35485195001 | 0.880 ppb |
| 2020-07-22 | 35565518001 | 0.690 ppb |
| 2020-07-22 | 35565518002 | 0.540 ppb |
| 2021-07-08 | 35646122001 | 0.750 ppb |
| 2021-07-08 | 35646122002 | 1.20 ppb |
| 2021-10-25 | 35673978004 | 0.910 ppb |
| 2021-10-25 | 35673978001 | 0.990 ppb |
| 2021-10-25 | 35673978002 | 1.20 ppb |
| 2021-10-25 | 35673978003 | 0.600 ppb |
| 2022-01-19 | 35691935001 | 0.820 ppb |
| 2022-01-19 | 35691935004 | 0.880 ppb |
| 2022-01-19 | 35691935003 | 0.620 ppb |
| 2022-01-19 | 35691935002 | 0.760 ppb |
| 2022-04-20 | 35712728004 | 0.960 ppb |
| 2022-04-20 | 35712728003 | 0.690 ppb |
| 2022-04-20 | 35712728002 | 1.20 ppb |
| 2022-04-20 | 35712728001 | 1.40 ppb |
| 2022-07-07 | 35730077004 | 1.90 ppb |
| 2022-07-07 | 35730077003 | 0.920 ppb |
| 2022-07-07 | 35730077002 | 2.20 ppb |
| 2022-07-07 | 35730077001 | 2.40 ppb |
| 2022-10-03 | 35750343001 | 0.940 ppb |
| 2022-10-03 | 35750343003 | ND |
| 2022-10-03 | 35750343002 | 0.510 ppb |
| 2022-10-03 | 35750343004 | 0.460 ppb |
| 2023-01-05 | 35770746003 | ND |
| 2023-01-05 | 35770746004 | 0.540 ppb |
| 2023-01-05 | 35770746002 | 0.580 ppb |
| 2023-01-05 | 35770746001 | 0.820 ppb |
| 2023-04-12 | 35792471004 | 0.790 ppb |
| 2023-04-12 | 35792471003 | 0.600 ppb |
| 2023-04-12 | 35792471002 | 1.30 ppb |
| 2023-04-12 | 35792471001 | 1.20 ppb |
| 2023-07-05 | 35811228001 | 2.00 ppb |
| 2023-07-05 | 35811228002 | 1.90 ppb |
| 2023-07-05 | 35811228003 | 0.680 ppb |
| 2023-07-05 | 35811228004 | 1.30 ppb |
| 2023-10-16 | 35835687001 | 1.20 ppb |
| 2023-10-16 | 35835687002 | 1.20 ppb |
| 2023-10-16 | 35835687003 | ND |
| 2023-10-16 | 35835687004 | 0.850 ppb |