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 |
|---|---|---|---|---|
|
Town of Parker County |
3,360 | 2 | 0 | |
|
Ruth Fisher School Tonopah · Maricopa County |
1,800 | 2 | 0 | |
|
Mayer Dwid Mayer · Yavapai County |
1,400 | 7 | 1 | |
|
Adot Burnt Well Rest Area Harquahala Valley · Maricopa County |
808 | 1 | 0 | |
|
Willow Beach Nps Willow Beach · Mohave County |
789 | 8 | 2 | |
|
Papago Butte Dwid Maricopa · Pinal County |
700 | 4 | 1 | |
|
Sun Valley Farms Unit VI Queen Creek · Pinal County |
600 | 7 | 2 | |
|
Park Water Company INC Florence · Pinal County |
427 | 4 | 0 | |
|
Krazy K RV Park Camp Verde · Yavapai County |
380 | 3 | 1 | |
|
Skyline Resort RV Park Magma · Pinal County |
375 | 6 | 1 | |
|
White Horse Ranch Owners Association Dewey · Yavapai County |
292 | 4 | 1 | |
|
Just for Fun RV Park Bouse · La Paz County |
212 | 1 | 1 | |
|
Adot Border Patrol Sonoita · Santa Cruz County |
100 | 5 | 0 | |
|
Hitching Post Apache Junction · Pinal County |
100 | 2 | 0 | |
|
Superior Products of AZ Chandler · Maricopa County |
85 | 4 | 1 | |
|
Mountain VU RV Court Cornville · Yavapai County |
80 | 5 | 0 | |
|
Softwinds Mobile Home Park Dewey · Yavapai County |
70 | 5 | 2 | |
|
Model Creek Elementary Yarnell · Yavapai County |
68 | 4 | 0 | |
|
C-Oasis Park Cottonwood · Yavapai County |
54 | 1 | 0 | |
|
Grandview Water Company Liberty · Maricopa County |
50 | 6 | 1 | |
|
Western Hill Baptist Church Glendale · Maricopa County |
50 | 1 | 0 | |
|
Shady Spot RV Park Quartzsite · La Paz County |
44 | 1 | 1 | |
|
First Steps Child Care Bridgeport · Yavapai County |
40 | 5 | 2 | |
|
CS Carter Water Company Carter · Pinal County |
28 | 5 | 2 | |
|
Gilbert, Town of Gilbert · Maricopa County |
247,600 | 9 | 1 | |
|
Chandler City of Chandler · Maricopa County |
247,328 | 4 | 0 | |
|
Peoria City of Peoria · Maricopa County |
187,676 | 4 | 1 | |
|
Epcor Agua Fria Surprise · Maricopa County |
128,040 | 5 | 0 | |
|
Epcor San Tan Johnson Ranch · Pinal County |
87,435 | 3 | 0 | |
|
Metropolitan Dwid Tucson · Pima County |
45,570 | 4 | 1 | |
|
Bullhead City Mohave Bullhead City · Mohave County |
36,330 | 13 | 1 | |
|
Foothills Water and Sewer LLC Yuma · Yuma County |
32,425 | 5 | 0 | |
|
Nogales City of Nogales · Santa Cruz County |
22,000 | 7 | 0 | |
|
Safford City of Safford · Graham County |
20,600 | 5 | 1 | |
|
Usaf Davis Monthan Afb Tucson · Pima County |
18,640 | 3 | 0 | |
|
Florence Water Company Florence · Pinal County |
14,593 | 5 | 1 | |
|
Pueblo del Sol Water Company Sierra Vista · Cochise County |
12,804 | 4 | 0 | |
|
Epcor San Tan Anthem Johnson Ranch · Pinal County |
10,362 | 2 | 0 | |
|
Eloy City of Eloy · Pinal County |
8,999 | 6 | 1 | |
|
Scua Upper Seven Mile County |
8,478 | 12 | 3 | |
|
Globe City of Globe · Gila County |
7,536 | 4 | 0 | |
|
Fort McDowell Community County |
7,260 | 3 | 0 | |
|
Cottonwood Municipal Water VV6 Cottonwood · Yavapai County |
4,518 | 2 | 0 | |
|
Aspc Lewis Complex Water System Buckeye · Maricopa County |
4,300 | 6 | 1 | |
|
Adoc Eyman Unit Florence · Pinal County |
3,969 | 8 | 2 | |
|
Kayenta Ntua Kayenta · County |
3,844 | 2 | 1 | |
|
Colorado River Regional Water System County |
3,476 | 6 | 0 | |
|
Arizona Village County |
3,211 | 10 | 2 | |
|
Black Canyon City Wid Black Canyon City · Yavapai County |
2,437 | 6 | 1 | |
|
Adot McGuireville Rest Area Cordes Junction · Yavapai County |
2,000 | 1 | 0 |
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. Retrieved from ECHO on Oct 11, 2026.