Know Your Environment. Protect Your Health.

2,4,5-TP (Silvex)

Kent Water Department

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

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.

 

13

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
2020N/A00N/A
2021ND90ND
2022ND30ND
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: Kent Water Department purchases water from City of Tacoma which is required to test for 2,4,5-tp (silvex). Sample information shown below was taken by City of Tacoma.

Date Lab ID Result
2021-06-214149607ND
2021-06-214149606ND
2021-06-214149605ND
2021-06-304142829ND
2021-06-304142830ND
2021-07-214157684ND
2021-07-214157695ND
2021-07-224157703ND
2022-02-014258884ND
2022-09-154369966ND
2022-11-154383023ND
2023-09-054543470ND
2023-09-064543472ND