Arsenic violations in Arizona
105 active public water systems in Arizona had a Arsenic violation in the past three years, 26 of them in the latest quarter of EPA's data. What Arsenic is and why it matters.
Health effects: Long-term arsenic exposure increases risk of bladder, lung, and skin cancers. It is also associated with cardiovascular disease, type 2 diabetes, and developmental effects in children. Arsenic is classified as a Group A human carcinogen by the EPA.
Systems with a Arsenic violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Gilbert, Town of Gilbert · Maricopa County |
247,600 | 9 | 1 | |
|
Nogales City of Nogales · Santa Cruz County |
22,000 | 7 | 0 | |
|
Scua Upper Seven Mile County |
8,478 | 12 | 3 | |
|
Big Park Water Company Sedona · Yavapai County |
7,392 | 6 | 3 | |
|
Epcor Lake Havasu Lake Havasu City · Mohave County |
4,712 | 5 | 0 | |
|
Scua Bylas Bylas · County |
3,160 | 12 | 3 | |
|
Black Canyon City Wid Black Canyon City · Yavapai County |
2,437 | 6 | 1 | |
|
Thunderbird Farms Dwid Maricopa · Pinal County |
2,315 | 2 | 0 | |
|
Mayer Dwid Mayer · Yavapai County |
1,400 | 7 | 1 | |
|
Willow Beach Nps Willow Beach · Mohave County |
789 | 8 | 2 | |
|
Scua Lower Peridot County |
702 | 7 | 3 | |
|
CS Oak Creek Public Service LLC Cornville · Yavapai County |
650 | 4 | 0 | |
|
CS Verde Lee Water Company Clifton · Greenlee County |
604 | 5 | 1 | |
|
ON the Greens Cottonwood · Yavapai County |
516 | 3 | 0 | |
|
CS EL Prado Water Company Yuma · Yuma County |
404 | 5 | 0 | |
|
Beaver Creek School Rimrock · Yavapai County |
400 | 4 | 0 | |
|
Nps Temple Bar Wtp Temple Bar · Mohave County |
305 | 4 | 0 | |
|
Scua Upper Peridot County |
275 | 4 | 2 | |
|
Little Park Water Company Oak Creek Canyon · Yavapai County |
264 | 6 | 4 | |
|
Scua Skill Center County |
234 | 3 | 1 | |
|
Riverbound Custom Storage and RV Park Lake Havasu City · Mohave County |
210 | 3 | 1 | |
|
Green Valley MHP Camp Verde · Yavapai County |
190 | 5 | 2 | |
|
Lagoon Estates WC Unit 2 Fort Valley · Mohave County |
125 | 4 | 0 | |
|
CS Citrus Park Water Company Tacna · Yuma County |
102 | 6 | 1 | |
|
Bouse Elementary School Bouse · La Paz County |
55 | 3 | 1 | |
|
Jones Coop Water Assoc Yuma · Yuma County |
29 | 7 | 0 | |
|
Chandler City of Chandler · Maricopa County |
247,328 | 4 | 0 | |
|
Arizona Water CO Pinal Valley Casa Grande · Pinal County |
134,432 | 2 | 0 | |
|
Epcor Agua Fria Surprise · Maricopa County |
128,040 | 5 | 0 | |
|
GW Santa Cruz Water CO Maricopa · Pinal County |
84,000 | 7 | 0 | |
|
Prescott City of Prescott · Yavapai County |
42,217 | 4 | 0 | |
|
Bullhead City Mohave Bullhead City · Mohave County |
36,330 | 13 | 1 | |
|
Arizona Water CO White Tanks White Tanks · Maricopa County |
18,858 | 2 | 0 | |
|
Wmatua Miner Flat County |
15,570 | 6 | 1 | |
|
Epcor North East Agua Fria Phoenix · Maricopa County |
14,723 | 2 | 0 | |
|
Epcor Paradise Valley/scottsdale Paradise Valley · Maricopa County |
14,107 | 2 | 0 | |
|
Cca Eloy Complex Eloy · Pinal County |
8,852 | 3 | 0 | |
|
Green Valley Dwid Green Valley · Pima County |
8,687 | 3 | 1 | |
|
Fort McDowell Community County |
7,260 | 3 | 0 | |
|
Metropolitan Dwid Diablo Village Tucson · Pima County |
5,542 | 3 | 0 | |
|
Golden Valley Improvement District Kingman · Mohave County |
3,950 | 2 | 1 | |
|
Polacca First Mesa Consolidated Villages · County |
3,890 | 6 | 4 | |
|
Colorado River Regional Water System County |
3,476 | 6 | 0 | |
|
Williams City of Williams · Coconino County |
3,145 | 7 | 1 | |
|
Wellton Town of Wellton · Yuma County |
3,000 | 10 | 1 | |
|
Clearwater Utility Company INC Buckeye · Maricopa County |
2,747 | 5 | 1 | |
|
Foothills Utilities Kingman East Kingman · Mohave County |
2,538 | 4 | 0 | |
|
Yavapai Apache Middle Verde Middle Verde · County |
2,200 | 1 | 0 | |
|
Bia San Carlos County |
2,150 | 8 | 1 | |
|
Yavapai Apache Cliff Castle County |
2,016 | 2 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved Arsenic, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Arsenic 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.