2,4,5-TP (Silvex)

City of Show Low

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
2014	ND	2	ND
2015	N/A	0	N/A
2016	ND	1	ND
2017	ND	13	ND
2018	ND	12	ND
2019	ND	5	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
2014-03-17	4031453-01	ND
2014-09-29	4092482-01S	ND
2016-03-15	6031423-01	ND
2017-02-07	7020790-01	ND
2017-02-14	7021416-01	ND
2017-05-09	7051152-01SOC	ND
2017-05-09	7051151-01SOC	ND
2017-07-11	7071085-01	ND
2017-07-11	7071080-01	ND
2017-08-01	7080264-01	ND
2017-08-01	7080262-01	ND
2017-08-01	7080261-01	ND
2017-08-22	7082406-05SOC	ND
2017-08-22	7082406-03	ND
2017-08-22	7082406-01	ND
2017-10-31	7110119-01	ND
2018-01-23	18A2483-01SOC	ND
2018-01-23	18A2482-02SOC	ND
2018-01-23	18A2482-01SOC	ND
2018-01-23	18A2476-01SOC	ND
2018-03-20	18C2057-01	ND
2018-04-03	18D0522-01 SOC	ND
2018-09-18	18I1881-01 SOC	ND
2018-10-30	18J3236-01 SOC	ND
2018-11-30	18L0549-07 SOC	ND
2018-12-03	18L0549-05 SOC	ND
2018-12-03	18L0549-01 SOC	ND
2018-12-03	18L0549-03 SOC	ND
2019-01-29	19A3116-03	ND
2019-01-29	19A3116-01	ND
2019-05-28	19E3013-01	ND
2019-05-28	19E3010-01	ND
2019-09-17	19I1958-01	ND