Toluene violations in Arizona
33 active public water systems in Arizona had a Toluene violation in the past three years, 3 of them in the latest quarter of EPA's data. What Toluene is and why it matters.
Systems with a Toluene violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Lago del Oro Water Company Catalina · Pinal County |
18,132 | 2 | 0 | |
|
Scua Bylas Bylas · County |
3,160 | 12 | 3 | |
|
Under Canvas Grand Canyon Valle · Coconino County |
275 | 1 | 0 | |
|
Tucson City of Tucson · Pima County |
732,906 | 3 | 0 | |
|
Mesa City of Mesa · Maricopa County |
466,000 | 3 | 0 | |
|
Chandler City of Chandler · Maricopa County |
247,328 | 4 | 0 | |
|
Epcor San Tan Johnson Ranch · Pinal County |
87,435 | 3 | 0 | |
|
Flagstaff City of Flagstaff · Coconino County |
79,796 | 5 | 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 | |
|
Bermuda Water Company INC Bullhead City · Mohave County |
25,000 | 4 | 0 | |
|
Grand Canyon National Park Grand Canyon · Coconino County |
16,590 | 7 | 0 | |
|
Flowing Wells Irrigation District Tucson · Pima County |
16,000 | 6 | 1 | |
|
Wmatua Miner Flat County |
15,570 | 6 | 1 | |
|
Scua Upper Seven Mile County |
8,478 | 12 | 3 | |
|
Big Park Water Company Sedona · Yavapai County |
7,392 | 6 | 3 | |
|
Arizona Village County |
3,211 | 10 | 2 | |
|
Chino Valley Town of Chino Valley · Yavapai County |
2,742 | 4 | 0 | |
|
Valle Verde Water Company East Nogales · Santa Cruz County |
2,397 | 4 | 0 | |
|
Bia San Carlos County |
2,150 | 8 | 1 | |
|
Cottonwood Municipal Water VV3 Cottonwood · Yavapai County |
1,450 | 2 | 0 | |
|
Town of Star Valley Water Department Star Valley · Gila County |
1,157 | 4 | 1 | |
|
Timberland Acres Dwid Show Low · Navajo County |
922 | 3 | 0 | |
|
Willow Beach Nps Willow Beach · Mohave County |
789 | 8 | 2 | |
|
San Carlos High School San Carlos High School · County |
626 | 5 | 0 | |
|
Duncan Town of Duncan · Greenlee County |
605 | 6 | 0 | |
|
Lower Moencopi Spring Source Lower Moencopi · County |
465 | 12 | 3 | |
|
Turquoise Triangle RV Park Cottonwood · Yavapai County |
120 | 3 | 0 | |
|
White Tank Well INC Surprise · Maricopa County |
87 | 3 | 0 | |
|
Sulger Water Company 2 Sierra Vista · Cochise County |
67 | 1 | 0 | |
|
Buenos Aires National Wildlife Refuge Sasabe · Pima County |
54 | 7 | 1 | |
|
Parker Lakeview Estates Parker Canyon Lake · Cochise County |
54 | 2 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved Toluene, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Toluene 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.