Know Your Environment. Protect Your Health.

2,4,5-TP (Silvex)

City of Hermiston

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.

 

16

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018N/A00N/A
2019N/A00N/A
2020ND80ND
2021N/A00N/A
2022N/A00N/A
2023ND80ND

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

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
2020-06-02006032202-SND
2020-06-02006032203-SND
2020-06-02006032201-SND
2020-06-02006032204-SND
2020-07-06007072503-SND
2020-07-06007080501-SND
2020-07-06007072501-SND
2020-07-06007072502-SND
2023-03-203032106-01-SND
2023-03-203032106-02-SND
2023-03-203032106-04-SND
2023-03-203032106-03-SND
2023-04-183041911-01-SND
2023-04-183041911-02-SND
2023-04-183041911-04-SND
2023-04-183041911-03-SND