Chloroform
Woodridge Village
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 | 59.0 ppb | 4 | 4 | 31.0 ppb - 92.9 ppb |
| 2019 | 30.5 ppb | 2 | 2 | 30.3 ppb - 30.6 ppb |
| 2020 | 33.4 ppb | 5 | 5 | 22.5 ppb - 39.6 ppb |
| 2021 | 67.2 ppb | 4 | 4 | 31.0 ppb - 108.0 ppb |
| 2022 | 38.1 ppb | 5 | 5 | 19.4 ppb - 64.0 ppb |
| 2023 | 52.9 ppb | 5 | 5 | 20.3 ppb - 85.0 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 |
|---|---|---|
| 2018-03-01 | DBP J8C0291 | 41.2 ppb |
| 2018-05-10 | DBP J8E0880-01 | 92.9 ppb |
| 2018-07-19 | DBP J8G1736-01 | 70.8 ppb |
| 2018-11-15 | DBP J8K0981-01,2 | 31.0 ppb |
| 2019-02-28 | DBP J9B1399-01 | 30.6 ppb |
| 2019-07-25 | DBP J9G1503-01 | 30.3 ppb |
| 2020-02-05 | DBP S000023319 | 36.2 ppb |
| 2020-05-04 | TTHM S000026501 | 22.5 ppb |
| 2020-07-31 | DBP9 S000032285 | 34.4 ppb |
| 2020-08-03 | DBP9 S000030187 | 34.4 ppb |
| 2020-11-03 | DBP S030182,95 | 39.6 ppb |
| 2021-03-24 | DBP 369667-01 | 31.0 ppb |
| 2021-05-19 | DBP 371299 | 57.0 ppb |
| 2021-08-10 | DBP S062168,57417 | 108.0 ppb |
| 2021-11-03 | DBP S068292,3 | 72.8 ppb |
| 2022-02-07 | POCS S062209 | 21.3 ppb |
| 2022-02-08 | DBP S074814 | 19.4 ppb |
| 2022-05-10 | DBP S074282,13 | 64.0 ppb |
| 2022-08-02 | DBP S000074783,910 | 53.1 ppb |
| 2022-11-09 | DBP S0103915,31 | 32.6 ppb |
| 2023-02-08 | DBP S0137412,00 | 20.3 ppb |
| 2023-05-02 | DBP SO137398, 413 | 63.0 ppb |
| 2023-08-10 | DBP S0137399,407 | 85.0 ppb |
| 2023-11-01 | POCS EHSS2300064397 | 51.0 ppb |
| 2023-11-15 | DBP S000166183 | 45.0 ppb |