Methoxychlor

Truckee Meadows 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.

MORE ABOUT THIS CONTAMINANT

199

Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Range of results
2013	N/A	0	N/A
2014	ND	26	ND
2015	ND	17	ND
2016	ND	31	ND
2017	ND	51	ND
2018	ND	41	ND
2019	ND	33	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
2014-04-22	0414-13-S	ND
2014-04-22	0414-12-S	ND
2014-04-22	0414-16-S	ND
2014-04-23	0414-17-S	ND
2014-06-09	0614-06-S	ND
2014-06-09	0614-07-S	ND
2014-06-17	0614-11-S	ND
2014-06-17	0614-10-S	ND
2014-06-17	0614-09-S	ND
2014-06-17	0614-12-S	ND
2014-06-17	0614-13-S	ND
2014-06-17	0614-14-S	ND
2014-07-29	0714-32	ND
2014-07-29	0714-33-S	ND
2014-07-29	0714-34-S	ND
2014-07-29	0714-35-S	ND
2014-07-29	0714-36-S	ND
2014-07-29	0714-37-S	ND
2014-07-30	0714-47-S	ND
2014-07-30	0714-46-S	ND
2014-07-30	0714-45-S	ND
2014-07-30	0714-48-S	ND
2014-09-02	0914-07-S	ND
2014-09-02	0914-06-S	ND
2014-09-02	0914-05-S	ND
2014-09-02	0914-06-W18	ND
2015-06-08	1506017-01	ND
2015-06-08	1506018-01	ND
2015-06-11	1506027-SOC	ND
2015-06-17	1506035-01	ND
2015-06-17	1506036-01	ND
2015-06-17	1506037-01	ND
2015-06-17	1506038-01	ND
2015-06-23	1506055-01	ND
2015-06-23	1506061-01	ND
2015-07-22	1507046-EUR	ND
2015-07-22	1507045-EUR	ND
2015-08-19	1508047-EUR	ND
2015-08-19	1508048-EUR	ND
2015-08-19	1508050-EUR	ND
2015-08-19	1508051-EUR	ND
2015-08-19	1508053-EUR	ND
2015-08-19	1508054-EUR	ND
2016-03-01	1603002-01EUR	ND
2016-05-31	1605028-01EUR	ND
2016-05-31	1605025-01EUR	ND
2016-05-31	1605026-01EUR	ND
2016-05-31	1605027-01EUR	ND
2016-06-01	1606001-01EUR	ND
2016-06-06	1606010-01EUR	ND
2016-06-06	1606013-01EUR	ND
2016-07-19	1607022-01EUR	ND
2016-07-19	1607021-01EUR	ND
2016-07-19	1607026-01EUR	ND
2016-07-19	1607023-01EUR	ND
2016-07-19	1607024-01EUR	ND
2016-07-19	1607025-01EUR	ND
2016-08-24	1608035-01EUR	ND
2016-08-24	1608034-01EUR	ND
2016-08-24	1608033-01EUR	ND
2016-08-25	1608036-01EUR	ND
2016-09-13	1609006-01EUR	ND
2016-09-13	1609007-01EUR	ND
2016-09-13	1609008-01EUR	ND
2016-09-13	1609009-01EUR	ND
2016-09-22	1609024-01EUR	ND
2016-10-12	1610015-01EUR	ND
2016-10-12	1610014-01EUR	ND
2016-10-12	1610012-01EUR	ND
2016-10-12	1610011-01EUR	ND
2016-10-12	1610016-01EUR	ND
2016-10-13	1610017-01EUR	ND
2016-10-18	1610027-01EUR	ND
2016-10-25	1610039-01EUR	ND
2017-01-11	1701006-01EUR	ND
2017-03-08	1703010-01EUR	ND
2017-03-08	1703009-01EUR	ND
2017-03-08	1703008-01EUR	ND
2017-05-02	1705003-01EUR	ND
2017-05-02	1705004-01EUR	ND
2017-05-03	1705010-01EUR	ND
2017-05-03	1705009-01EUR	ND
2017-05-15	1705022-01EUR	ND
2017-05-15	1705023-01EUR	ND
2017-05-15	1705025-01EUR	ND
2017-05-15	1705024-01EUR	ND
2017-05-25	1705042-01EUR	ND
2017-05-25	1705041-01EUR	ND
2017-07-11	1707003-01EUR	ND
2017-07-11	1707002-01EUR	ND
2017-07-11	1707005-01EUR	ND
2017-07-11	1707004-01EUR	ND
2017-07-12	1707010-01EUR	ND
2017-07-12	1707012-01EUR	ND
2017-07-12	1707008-01EUR	ND
2017-07-18	1707020-01EUR	ND
2017-07-18	1707021-01EUR	ND
2017-07-18	1707022-01EUR	ND
2017-07-18	1707023-01EUR	ND
2017-08-16	1708013-01EUR	ND
2017-08-16	1708014-01EUR	ND
2017-09-12	1708026-02EUR	ND
2017-09-12	1708028-02EUR	ND
2017-09-12	1708027-02EUR	ND
2017-09-12	1708029-02EUR	ND
2017-09-12	1708025-02EUR	ND
2017-10-10	1710015-01EUR	ND
2017-10-10	1710009-01EUR	ND
2017-10-10	1710014-01EUR	ND
2017-10-10	1710016-01EUR	ND
2017-10-10	1710017-01EUR	ND
2017-10-10	1710018-01EUR	ND
2017-10-25	1710032-01EUR	ND
2017-10-25	1710033-01EUR	ND
2017-10-25	1710035-01EUR	ND
2017-10-25	1710036-01EUR	ND
2017-10-31	1710048-01EUR	ND
2017-10-31	1710049-01EUR	ND
2017-11-01	1711001-01EUR	ND
2017-11-17	1712011-01EUR	ND
2017-11-17	1712010-01EUR	ND
2017-11-17	1712009-01EUR	ND
2017-12-04	1712032-01EUR	ND
2017-12-05	1712023-01EUR	ND
2017-12-05	1712021-01EUR	ND
2018-01-23	1801009-01EUR	ND
2018-01-23	1801010-01EUR	ND
2018-02-01	1802001-01EUR	ND
2018-02-01	1802003-01EUR	ND
2018-02-06	1802006-01EUR	ND
2018-02-07	1802007-01EUR	ND
2018-04-04	1804005-01WEC	ND
2018-04-04	1804006-01EUR	ND
2018-04-04	1804007-01EUR	ND
2018-04-09	1804011-01WEC	ND
2018-04-09	1804012-01WEC	ND
2018-04-10	1804036-01EUR	ND
2018-04-11	1804017-01WEC	ND
2018-04-11	1804018-01WEC	ND
2018-04-11	1804019-01WEC	ND
2018-04-24	1804027-01WEC	ND
2018-04-25	1804025-01WEC	ND
2018-04-26	1804044-01WEC	ND
2018-05-02	1805008-01EUR	ND
2018-05-02	1805009-01EUR	ND
2018-05-02	1805010-01EUR	ND
2018-05-23	1805041-01WEC	ND
2018-06-05	1806009-01WEC	ND
2018-07-09	1807007-01WEC	ND
2018-07-09	1807008-01WEC	ND
2018-07-24	1807025-01WEC	ND
2018-08-07	1808008-01WEC	ND
2018-08-07	1808009-01WEC	ND
2018-08-07	1808010-01WEC	ND
2018-08-07	1808011-01WEC	ND
2018-08-07	1808012-01WEC	ND
2018-08-07	1808013-01WEC	ND
2018-08-14	1808024-01WEC	ND
2018-08-14	1808025-01WEC	ND
2018-10-10	1810015-02WEC	ND
2018-10-24	1810032-01WEC	ND
2018-10-24	1810033-01WEC	ND
2018-10-24	1810035-01WEC	ND
2018-10-24	1810036-01WEC	ND
2018-10-24	1810037-01WEC	ND
2018-10-24	1810038-01WEC	ND
2019-01-09	1901012-02WEC	ND
2019-01-09	1901013-02WEC	ND
2019-01-16	1901017-02WEC	ND
2019-02-05	1902001-01WEC	ND
2019-02-26	1902019-01WEC	ND
2019-04-08	1904004-01WEC	ND
2019-05-07	1905007-01WEC	ND
2019-05-07	1905008-01WEC	ND
2019-05-29	1905027-01WEC	ND
2019-06-19	1906013-01WEC	ND
2019-06-19	1906014-01WEC	ND
2019-06-19	1906015-01WEC	ND
2019-06-19	1906016-01WEC	ND
2019-06-27	1906021-01WEC	ND
2019-06-27	1906022-01WEC	ND
2019-06-27	1906023-01WEC	ND
2019-07-01	1907003-01WEC	ND
2019-07-01	1907004-01WEC	ND
2019-07-01	1907005-01WEC	ND
2019-07-01	1907006-01WEC	ND
2019-07-01	1907012-01WEC	ND
2019-07-09	1907014-02WEC	ND
2019-07-25	1907045-01WEC	ND
2019-07-29	1907046-01WEC	ND
2019-07-30	1907048-01WEC	ND
2019-08-06	1908002-01WEC	ND
2019-08-06	1908004-01WEC	ND
2019-08-06	1908007-01WEC	ND
2019-08-07	1908008-02WEC	ND
2019-08-07	1908009-02WEC	ND
2019-08-07	1908010-02WEC	ND
2019-10-01	1910004-01WEC	ND
2019-10-01	1910006-01WEC	ND