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CAS 93-72-1

2,4,5-TP

Organic Chemicals, except for PFASPesticidesCarcinogen

2,4,5-TP (also called silvex) is a synthetic herbicide once used to kill brush and broadleaf weeds. Most uses were canceled in the U.S. due to health concerns and past contamination with dioxin; it may still be found in some soils and waters near former use areas [1][2].

Where It Comes From

Legacy use on rangeland, rights‑of‑way, and lawns; residues at manufacturing or disposal sites; it can get into surface and groundwater. EPA’s drinking water limit (MCL) is 0.05 mg/L [2].

How You Are Exposed

Drinking contaminated private well or small system water; contact with contaminated soil or sediment; work during site cleanup or with old stockpiles [1][2].

Why It Matters

Short-term high exposure can cause irritation and nervous system symptoms; longer-term exposure above guidelines may affect the liver and kidneys. Concern has also centered on possible TCDD (dioxin) impurities, a known human carcinogen [1][2][3].

Who Is at Risk

People using private wells near former application or disposal areas; cleanup workers; pregnant people and young children [1][2].

How to Lower Your Exposure

Test private well water for 2,4,5-TP; if detected, use certified activated carbon or ion-exchange treatment; avoid disturbing contaminated soils; follow PPE and local advisories during cleanup [2][4].

References

  1. [1]ATSDR. Toxicological Profile for Chlorophenoxy Herbicides (2,4-D; 2,4,5-T). U.S. HHS.
  2. [2]U.S. EPA. Consumer Factsheet on: 2,4,5-TP (Silvex) and National Primary Drinking Water Regulations.
  3. [3]IARC. TCDD (dioxin) — Group 1 carcinogen.
  4. [4]CDC. Choosing Home Water Filters & Other Water Treatment Systems.

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