2,4,5-TP (Silvex)

Aquarion Water Company of Connecticut - Simsbury System

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	N/A	0	N/A
2015	N/A	0	N/A
2016	ND	12	ND
2017	N/A	0	N/A
2018	N/A	0	N/A
2019	ND	12	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
2016-03-03	201602859-SOC	ND
2016-03-03	201602853-SOC	ND
2016-03-03	201602855-SOC	ND
2016-03-03	201602857-SOC	ND
2016-03-03	201602862-SOC	ND
2016-03-03	201602850-SOC	ND
2016-05-04	201605678-SOC	ND
2016-05-04	201605688-SOC	ND
2016-05-04	201605682-SOC	ND
2016-05-04	201605684-SOC	ND
2016-05-04	201605686-SOC	ND
2016-05-04	201605691-SOC	ND
2019-03-06	201902893-SOC	ND
2019-03-06	201902905-SOC	ND
2019-03-06	201902900-SOC	ND
2019-03-06	201902898-SOC	ND
2019-03-06	201902896-SOC	ND
2019-03-06	201902902-SOC	ND
2019-10-08	201916347-SOC	ND
2019-10-08	201916356-SOC	ND
2019-10-08	201916350-SOC	ND
2019-10-08	201916352-SOC	ND
2019-10-08	201916354-SOC	ND
2019-10-08	201916359-SOC	ND