Methoxychlor
Metropolitan District Commission
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 | 11 | 0 | ND |
| 2019 | ND | 4 | 0 | ND |
| 2020 | ND | 7 | 0 | ND |
| 2021 | ND | 7 | 0 | ND |
| 2022 | ND | 7 | 0 | ND |
| 2023 | ND | 7 | 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 |
|---|---|---|
| 2018-06-27 | CA79476 | ND |
| 2018-06-27 | CA79475 | ND |
| 2018-06-27 | CA79477 | ND |
| 2018-07-18 | SOCR 200500124 | ND |
| 2018-07-18 | SOCR 200500122 | ND |
| 2018-07-18 | SOCR 200500126 | ND |
| 2018-07-18 | SOCR 200500125 | ND |
| 2018-09-25 | CB38504 | ND |
| 2018-09-25 | CB38505R | ND |
| 2018-09-25 | CB38869 | ND |
| 2018-09-25 | CB38505 | ND |
| 2019-07-08 | SOCR 200539198 | ND |
| 2019-07-08 | SOCR 200539200 | ND |
| 2019-07-08 | SOCR 200539199 | ND |
| 2019-07-08 | SOCR 200539197 | ND |
| 2020-12-08 | SOC 200600638 | ND |
| 2020-12-08 | SOC 200600609 | ND |
| 2020-12-08 | SOCR 200600618 | ND |
| 2020-12-08 | SOCR 200600626 | ND |
| 2020-12-08 | SOCR 200600627 | ND |
| 2020-12-08 | SOCR 200600628 | ND |
| 2020-12-09 | SOC 200600592 | ND |
| 2021-11-23 | S300107593 300107596 | ND |
| 2021-11-23 | H300107603 300107605 | ND |
| 2021-11-23 | S300107511 300107513 | ND |
| 2021-11-29 | S300109627 300109629 | ND |
| 2021-11-29 | H300109590 300109591 | ND |
| 2021-11-30 | H300109617 300109619 | ND |
| 2021-11-30 | H300109618 300109621 | ND |
| 2022-12-08 | H300283837 300283838 | ND |
| 2022-12-08 | 300283822 300283831C | ND |
| 2022-12-15 | S300287062 300287065 | ND |
| 2022-12-15 | H300287081 300287082 | ND |
| 2022-12-15 | H300287109 300287116 | ND |
| 2022-12-15 | S300287090 300287093 | ND |
| 2022-12-15 | S300287039 300287044 | ND |
| 2023-12-05 | S300456329 300456332 | ND |
| 2023-12-05 | H300456519 300456520 | ND |
| 2023-12-05 | H300456542 300456543 | ND |
| 2023-12-05 | H300456513 300456514 | ND |
| 2023-12-06 | S300456308 300456311 | ND |
| 2023-12-06 | S300456298 300456301 | ND |
| 2023-12-06 | H300456516 300456517 | ND |