1,2-Dichloropropane
CTWC - Unionville System
NOTE: CTWC - Unionville System purchases water from Metropolitan District Commission which is required to test for 1,2-dichloropropane. Sample information shown below was taken by Metropolitan District Commission.
1,2-Dichloropropane is a volatile carcinogenic solvent discharged from chemical factories and landfills. It also contaminates farmland due to its former use as a soil fumigant. Read More.
The insecticide and fumigant uses of 1,2-dichloropropane were discontinued in the 1980s, but it is still used as an industrial solvent. The California public health goal of 0.5 parts per billion, set to protect against cancer, is 10 times lower than the amount allowed by the federal government, which is a Maximum Contaminant Level of 5 parts per billion. 1,2-Dichloropropane can also damage the nervous system, liver, kidneys, and digestive and respiratory systems.
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 | 3 | 0 | ND |
| 2019 | ND | 2 | 0 | ND |
| 2020 | ND | 5 | 0 | ND |
| 2021 | ND | 5 | 0 | ND |
| 2022 | ND | 4 | 0 | ND |
| 2023 | ND | 1 | 0 | ND |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
EWG Health Guideline: 0.5 ppb
The EWG Health Guideline of 0.5 ppb for 1,2-dichloropropane was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.
EPA Maximum Contaminant
Level (MCL): 5 ppb
The legal limit for 1,2-dichloropropane, established in 1991, was based on analytical detection limits at the time that the standard was set. This limit may not fully protect against the risk of cancer.
ppb = parts per billion
All test results
NOTE: CTWC - Unionville System purchases water from Metropolitan District Commission which is required to test for 1,2-dichloropropane. Sample information shown below was taken by Metropolitan District Commission.
| Date | Lab ID | Result |
|---|---|---|
| 2018-07-16 | AE00927GE | ND |
| 2018-07-16 | AE00912GE | ND |
| 2018-07-16 | AE00911GE | ND |
| 2019-06-05 | AE29314GE | ND |
| 2019-06-05 | AE29313GE | ND |
| 2019-06-05 | AE29315GE | ND |
| 2020-06-02 | AE59301GE | ND |
| 2020-06-02 | AE59305GE | ND |
| 2020-06-02 | AE59302GE | ND |
| 2021-11-23 | V300107450 300107457 | ND |
| 2021-11-23 | V300107451 300107463 | ND |
| 2021-11-29 | V300109635 300109637 | ND |
| 2022-12-15 | V300287053 300287060 | ND |
| 2022-12-15 | V300287072 300287079 | ND |
| 2022-12-15 | V300287100 300287107 | ND |
| 2023-12-06 | V300456527 300456529 | ND |
| 2023-12-06 | V300456525 300456531 | ND |
| 2023-12-06 | V300456533 300456535 | ND |