Know Your Environment. Protect Your Health.

2,4,5-TP (Silvex)

City of Tualatin

NOTE: City of Tualatin purchases water from Portland Water Bureau which is required to test for 2,4,5-tp (silvex). Sample information shown below was taken by Portland Water Bureau.

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.

 

9

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND10ND
2019N/A00N/A
2020ND20ND
2021ND10ND
2022N/A00N/A
2023ND20ND

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

NOTE: City of Tualatin purchases water from Portland Water Bureau which is required to test for 2,4,5-tp (silvex). Sample information shown below was taken by Portland Water Bureau.

Date Lab ID Result
2018-03-15BC03118-SND
2020-05-12BC38533-SND
2020-08-04202008070432-SND
2020-08-05202008070418-SND
2021-08-04BC60213-SND
2023-04-04380-42758-1-SND
2023-08-15380-59561-1-SND
2023-08-29380-61323-1ND
2023-10-02380-65583-1-SND