Methoxychlor
CTWC - Shoreline Region-Guilford System
Methoxychlor is an endocrine-disrupting, neurotoxic insecticide similar to DDT. Banned in the U.S. in 2002, methoxychlor was historically used on farm animals and in animal feed, lumber, gardens and agricultural crops.
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 | 2 | 0 | ND |
| 2019 | ND | 16 | 0 | ND |
| 2020 | ND | 1 | 0 | ND |
| 2021 | ND | 2 | 0 | ND |
| 2022 | ND | 16 | 0 | ND |
| 2023 | ND | 1 | 0 | ND |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
EWG Health Guideline: 0.09 ppb
The EWG Health Guideline of 0.09 ppb for methoxychlor 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 hormone disruption.
EPA Maximum Contaminant
Level (MCL): 40 ppb
The legal limit for methoxychlor, established in 1991, was based on a toxicity study in laboratory animals conducted in the 1980s.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2018-03-30 | CA11465SOCR | ND |
| 2018-07-09 | CA86688 | ND |
| 2019-01-30 | SOC 200520057 | ND |
| 2019-02-27 | SOCR 200523002 | ND |
| 2019-06-06 | SOC 200535308 | ND |
| 2019-06-06 | SOC 200535309 | ND |
| 2019-06-11 | SOC 200536055 | ND |
| 2019-06-11 | SOC 200536054 | ND |
| 2019-06-19 | SOC 200542695 | ND |
| 2019-06-24 | SOC 200537520 | ND |
| 2019-07-29 | SOC 200542348 | ND |
| 2019-07-30 | SOC 200542453 | ND |
| 2019-07-31 | SOC 200542480 | ND |
| 2019-07-31 | SOC 200542466 | ND |
| 2019-07-31 | SOC 200542497 | ND |
| 2019-07-31 | SOC 200542499 | ND |
| 2019-07-31 | SOC 200542468 | ND |
| 2019-08-14 | SOC 200544869 | ND |
| 2020-02-11 | RSOC 200565797 | ND |
| 2021-09-30 | S300072074 300072088 | ND |
| 2021-09-30 | H300072106 300072107 | ND |
| 2022-06-14 | CL56474 | ND |
| 2022-06-14 | CL56470 | ND |
| 2022-06-14 | CL56472 | ND |
| 2022-06-15 | CL57887 | ND |
| 2022-06-15 | CL57885 | ND |
| 2022-06-22 | CL62297 | ND |
| 2022-06-28 | CL66245 | ND |
| 2022-07-18 | CL80436 | ND |
| 2022-07-18 | CL80432 | ND |
| 2022-07-18 | CL80438 | ND |
| 2022-07-18 | CL80434 | ND |
| 2022-07-25 | CL88838 | ND |
| 2022-07-25 | CL88842 | ND |
| 2022-08-29 | CM17828 | ND |
| 2022-08-29 | CM17831 | ND |
| 2022-10-19 | CM66672 | ND |
| 2023-02-13 | CN41859 | ND |