Nitrate violations in Arizona
210 active public water systems in Arizona had a Nitrate violation in the past three years, 24 of them in the latest quarter of EPA's data. What Nitrate is and why it matters.
Systems with a Nitrate violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Usfs Cnf Lake View Parker · Cochise County |
30 | 1 | 0 | |
|
Mulberry Park MHP Cornville · Yavapai County |
28 | 4 | 0 | |
|
Chevron Freeway Willcox · Cochise County |
25 | 1 | 0 | |
|
High Desert Water Company Meadview · Mohave County |
25 | 3 | 1 | |
|
Kaibab Water LLC Yavapai County |
25 | 3 | 0 | |
|
Manzanita Restaurant, LLC Cornville · Yavapai County |
25 | 3 | 0 | |
|
Pleasant Valley Community Young · Gila County |
25 | 2 | 0 | |
|
Sierra Verde Ranch 1 Seligman · Yavapai County |
25 | 3 | 0 | |
|
Usfs Asnf Hannagan Meadow Hannagan Meadow · Greenlee County |
25 | 2 | 0 | |
|
Usfs Knf Big Springs Jacob Lake · Coconino County |
25 | 4 | 2 |
About this data
A system is counted once if any of its violations in the past three years involved Nitrate, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Nitrate 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.