Tapcensus

2,4-D violations in Washington

5 active public water systems in Washington had a 2,4-D violation in the past three years. What 2,4-D is and why it matters.

Health effects: Chronic exposure to 2,4-D is associated with kidney, liver, and adrenal gland damage in animal studies. IARC classifies it as possibly carcinogenic to humans (Group 2B); EPA's classification is not likely to be carcinogenic under current guidelines. Individuals with kidney or liver conditions may face greater risk from long-term exposure.

Systems with a 2,4-D violation

Latest quarter first, then largest first
SystemServesStatusRules violated, 3 yrUnresolved
Makah Neah Bay
Neah Bay · County 		1,300 11 0
Wellpinit School
County 		473 5 0
Fort Simcoe Job Corps Ctr
Toppenish · County 		230 8 1
Chief Kitsap Academy
Poulsbo · County 		120 6 0
San Poil
Keller · County 		86 5 0
About this data

A system is counted once if any of its violations in the past three years involved 2,4-D, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not 2,4-D alone.

Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Washington records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.