Hexachlorocyclopentadiene
Gretna Waterworks
Hexachlorocyclopentadiene was historically used for the manufacture of currently banned pesticides, such as endrin, dieldrin and chlordane. It’s still used for production of flame retardants, resins and plastics.
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 | 0.0480 ppb | 4 | 4 | 0.0440 ppb - 0.0520 ppb |
| 2019 | 0.0370 ppb | 4 | 4 | 0.0180 ppb - 0.0560 ppb |
| 2020 | ND | 2 | 0 | ND |
| 2021 | 0.0290 ppb | 2 | 2 | 0.0260 ppb - 0.0320 ppb |
| 2022 | ND | 2 | 0 | ND |
| 2023 | 0.0320 ppb | 2 | 2 | 0.0310 ppb - 0.0330 ppb |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
EWG Health Guideline: 2 ppb
The EWG Health Guideline of 2 ppb for hexachlorocyclopentadiene 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 harm to the stomach and intestines.
EPA Maximum Contaminant
Level (MCL): 50 ppb
The legal limit for hexachlorocyclopentadiene, established in 1992, was based on a toxicity study in laboratory animals conducted in the 1980s.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2018-04-17 | 35386954003 | 0.0440 ppb |
| 2018-04-17 | 35386954003 | 0.0440 ppb |
| 2018-10-02 | 35421766001 | 0.0520 ppb |
| 2018-10-02 | 35421766001 | 0.0520 ppb |
| 2019-02-05 | 35446730001 | 0.0180 ppb |
| 2019-02-05 | 35446730001 | 0.0180 ppb |
| 2019-08-14 | 35490413001 | 0.0560 ppb |
| 2019-08-14 | 35490413001 | 0.0560 ppb |
| 2020-03-18 | 35538511001 | ND |
| 2020-10-26 | 35587648001 | ND |
| 2021-03-01 | 35615731001 | 0.0320 ppb |
| 2021-12-08 | 35683666002 | 0.0260 ppb |
| 2022-01-13 | 35690761001 | ND |
| 2022-08-04 | 35737249001 | ND |
| 2023-02-01 | 35777180001 | 0.0330 ppb |
| 2023-10-11 | 35834160001 | 0.0310 ppb |