Methoxychlor
Regional Water Authority
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 |
|---|---|---|---|---|
| 2014 | ND | 4 | 0 | ND |
| 2015 | ND | 5 | 0 | ND |
| 2016 | ND | 23 | 0 | ND |
| 2017 | ND | 4 | 0 | ND |
| 2018 | ND | 4 | 0 | ND |
| 2019 | ND | 26 | 0 | ND |
ppb = parts per billion
State and national drinking water standards and health guidelines
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 |
|---|---|---|
| 2014-12-09 | SOCR 200409186 | ND |
| 2014-12-09 | SOCR 200409185 | ND |
| 2014-12-09 | SOCR 200409203 | ND |
| 2014-12-09 | SOCR 200409202 | ND |
| 2015-03-03 | SOCR 200412990 | ND |
| 2015-03-03 | SOCR 200412991 | ND |
| 2015-03-03 | SOCR 200412906 | ND |
| 2015-03-04 | SOCR 200413024 | ND |
| 2015-06-25 | SOC 200419193 | ND |
| 2016-02-29 | SOCR 200434389 | ND |
| 2016-02-29 | SOCR 200434374 | ND |
| 2016-02-29 | SOCR 200434388 | ND |
| 2016-02-29 | SOCR 200434373 | ND |
| 2016-05-16 | SOC 200439620 | ND |
| 2016-05-16 | SOC 200439628 | ND |
| 2016-05-16 | SOC 200439627 | ND |
| 2016-05-16 | SOC 200439619 | ND |
| 2016-05-16 | SOC 200439623 | ND |
| 2016-05-16 | SOC 200439625 | ND |
| 2016-05-16 | SOC 200439626 | ND |
| 2016-05-16 | SOC 200439622 | ND |
| 2016-08-29 | SOC 200448465 | ND |
| 2016-08-29 | SOC 200448473 | ND |
| 2016-08-29 | SOC 200448472 | ND |
| 2016-08-29 | SOC 200448466 | ND |
| 2016-08-29 | SOC 200448468 | ND |
| 2016-08-29 | SOC 200448469 | ND |
| 2016-08-29 | SOC 200448470 | ND |
| 2016-08-29 | SOC 200448471 | ND |
| 2016-08-30 | SOC 200448554 | ND |
| 2016-09-28 | SOC 200451204 | ND |
| 2016-11-22 | SOC 200455270 | ND |
| 2017-02-27 | SOCR 200461303 | ND |
| 2017-02-27 | SOCR 200461318 | ND |
| 2017-02-27 | SOCR 200461319 | ND |
| 2017-06-22 | SOCR 200470146 | ND |
| 2018-03-05 | SOCR 200489131 | ND |
| 2018-03-05 | SOCR 200489130 | ND |
| 2018-03-05 | SOCR 200489152 | ND |
| 2018-11-29 | SOCR 200514127 | ND |
| 2019-03-04 | SOCR 200523153 | ND |
| 2019-03-04 | SOCR 200523178 | ND |
| 2019-03-04 | SOCR 200523152 | ND |
| 2019-03-04 | SOCR 200523177 | ND |
| 2019-05-08 | SOC 200531300 | ND |
| 2019-05-28 | SOC 200533659 | ND |
| 2019-05-28 | SOC 200533660 | ND |
| 2019-05-28 | SOC 200533804 | ND |
| 2019-05-28 | SOC 200533719 | ND |
| 2019-05-28 | SOC 200533720 | ND |
| 2019-05-28 | SOC 200533803 | ND |
| 2019-05-29 | SOC 200533881 | ND |
| 2019-05-29 | SOC 200533880 | ND |
| 2019-05-29 | SOC 200533867 | ND |
| 2019-05-29 | SOC 200533868 | ND |
| 2019-08-26 | SOC 200546200 | ND |
| 2019-08-26 | SOC 200546198 | ND |
| 2019-08-26 | SOC 200546197 | ND |
| 2019-08-27 | SOC 200546267 | ND |
| 2019-08-27 | SOC 200546268 | ND |
| 2019-08-27 | SOC 200546302 | ND |
| 2019-08-27 | SOC 200546303 | ND |
| 2019-08-28 | SOC 200546738 | ND |
| 2019-08-28 | SOC 200546737 | ND |
| 2019-08-28 | SOC 200546736 | ND |
| 2019-08-28 | SOC 200546553 | ND |