Tapcensus

2,4-D violations in Arizona

17 active public water systems in Arizona had a 2,4-D violation in the past three years, 1 of them in the latest quarter of EPA's data. 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
Scua Bylas
Bylas · County 		3,160 12 3
Gilbert, Town of
Gilbert · Maricopa County 		247,600 9 1
Scottsdale City of
Scottsdale · Maricopa County 		241,361 2 0
Epcor Agua Fria
Surprise · Maricopa County 		128,040 5 0
GW Santa Cruz Water CO
Maricopa · Pinal County 		84,000 7 0
Flagstaff City of
Flagstaff · Coconino County 		79,796 5 0
Goodyear Water Department
Goodyear · Maricopa County 		50,001 4 0
Bullhead City Mohave
Bullhead City · Mohave County 		36,330 13 1
Epcor Chaparral City
Fountain Hills · Maricopa County 		26,026 2 0
Liberty Water Rio Rico
Rio Rico · Santa Cruz County 		17,960 3 0
Apache Junction Water District
Apache Junction · Pinal County 		15,610 6 0
Pueblo del Sol Water Company
Sierra Vista · Cochise County 		12,804 4 0
Scua Upper Seven Mile
County 		8,478 12 3
Aspc Lewis Complex Water System
Buckeye · Maricopa County 		4,300 6 1
Arizona Village
County 		3,211 10 2
Lower Moencopi Spring Source
Lower Moencopi · County 		465 12 3
Hopi Veterans Center
Hopi Veterans Center · County 		388 3 1
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 Arizona 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.