2,4,5-TP (Silvex)

Leeds Water Board

2(2,4,5-trichlorophenoxy) propionic acid (2,4,5-TP or Silvex) is a cancer-causing herbicide banned in the U.S. in 1985 because of its toxicity. It is still detected as a groundwater contaminant in areas where it was sprayed or stored.

MORE ABOUT THIS CONTAMINANT

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	12	ND
2015	N/A	0	N/A
2016	ND	2	ND
2017	ND	11	ND
2018	N/A	0	N/A
2019	ND	6	ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 3 ppb

The EWG Health Guideline of 3 ppb for 2,4,5-TP 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 internal organs.

EPA Maximum Contaminant
Level (MCL) 50 ppb

ppb = parts per billion

All test results

Date	Lab ID	Result
2014-02-07	1402-00132-3	ND
2014-02-07	1402-00132-6	ND
2014-02-07	1402-00132-5	ND
2014-02-07	1402-00132-1	ND
2014-02-07	1402-00132-2	ND
2014-02-07	1402-00132-4	ND
2014-07-21	1407-00247-4	ND
2014-07-21	1407-00247-3	ND
2014-07-21	1407-00247-1	ND
2014-07-21	1407-00247-6	ND
2014-07-21	1407-00247-5	ND
2014-07-21	1407-00247-2	ND
2016-01-19	1601-00275-8	ND
2016-07-18	1607-00217-7	ND
2017-01-10	1701-00096-1	ND
2017-01-10	1701-00096-5	ND
2017-01-10	1701-00096-3	ND
2017-01-10	1701-00096-4	ND
2017-01-10	1701-00096-2	ND
2017-07-18	1707-00227-12	ND
2017-07-18	1707-00227-3	ND
2017-07-18	1707-00227-7	ND
2017-07-18	1707-00227-10	ND
2017-07-18	1707-00227-5	ND
2017-10-04	1710-00071-1S	ND
2019-01-15	1901-00212-008	ND
2019-04-25	1904-00393-001	ND
2019-07-17	1907-00242-008	ND
2019-07-31	1907-00423-002	ND
2019-10-21	1910-00348-006	ND
2019-10-21	1910-00348-003	ND