Know Your Environment. Protect Your Health.

2,4,5-TP (Silvex)

The Oaks Water Supply Corporation

NOTE: The Oaks Water Supply Corporation purchases water from San Antonio Water System which is required to test for 2,4,5-tp (silvex). Sample information shown below was taken by San Antonio Water 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.

 

96

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND40ND
2019ND70ND
2020ND330ND
2021ND40ND
2022ND50ND
2023ND310ND

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: The Oaks Water Supply Corporation purchases water from San Antonio Water System which is required to test for 2,4,5-tp (silvex). Sample information shown below was taken by San Antonio Water System.

Date Lab ID Result
2018-03-01AE16420ND
2018-05-10AE25988ND
2018-07-02AE32301ND
2018-08-31AE39182ND
2018-11-19AE46528ND
2018-11-19AE46525ND
2018-12-13AE48873ND
2019-01-30AE52285ND
2019-01-31AE52510ND
2019-03-28AE60522ND
2019-03-28AE60523ND
2019-04-23AE63412ND
2019-04-25AE63785ND
2019-11-26AE90663ND
2020-02-19AE99069ND
2020-03-26AF04771ND
2020-03-26AF04776ND
2020-03-30AF04918ND
2020-03-30AF04919ND
2020-03-30AF04920ND
2020-03-31AF05115ND
2020-03-31AF05116ND
2020-03-31AF05117ND
2020-06-15AF15400ND
2020-07-21AF20501ND
2020-07-21AF20499ND
2020-10-05AF29539ND
2020-10-05AF29540ND
2020-10-05AF29541ND
2020-10-07AF29860ND
2020-10-07AF29861ND
2020-11-11AF34203ND
2020-11-11AF34202ND
2020-11-11AF34196ND
2020-11-12AF34436ND
2020-11-16AF34675ND
2020-11-16AF34674ND
2020-11-16AF34673ND
2020-11-17AF34944ND
2020-11-17AF34945ND
2020-11-17AF34943ND
2020-11-18AF35141ND
2020-11-18AF35140ND
2020-11-18AF35139ND
2020-11-19AF35326ND
2020-12-15AF37728ND
2020-12-18AF38179ND
2021-03-03AF45191ND
2021-03-03AF45190ND
2021-05-11AF53331ND
2021-05-11AF53332ND
2021-05-20AF54920ND
2021-06-14AF57903ND
2021-07-13AF61761ND
2021-07-13AF61765ND
2021-08-04AF64872ND
2021-09-28AF71439ND
2021-11-29AF77395ND
2021-11-30AF77560ND
2021-12-01AF77697ND
2022-04-13AF93216ND
2022-06-27AG02424ND
2022-10-24AG18126ND
2022-10-25AG18393ND
2022-12-07AG21176ND
2023-02-22AG30035ND
2023-06-27AG46281ND
2023-07-11AG47947ND
2023-07-12AG48276ND
2023-07-12AG48277ND
2023-10-05AG58710ND
2023-10-31AG61781ND
2023-10-31AG61779ND
2023-10-31AG61778ND
2023-10-31AG61777ND
2023-10-31AG61780ND
2023-11-01AG62041ND
2023-11-01AG62040ND
2023-11-01AG62039ND
2023-11-01AG62038ND
2023-11-14AG63605ND
2023-11-15AG63835ND
2023-11-15AG63838ND
2023-11-15AG63837ND
2023-11-15AG63834ND
2023-11-15AG63833ND
2023-11-15AG63832ND
2023-11-15AG63830ND
2023-11-15AG63829ND
2023-11-15AG63828ND
2023-11-15AG63827ND
2023-11-16AG64047ND
2023-12-18AG66893ND
2023-12-18AG66895ND
2023-12-19AG67059ND
2023-12-19AG67060ND