Arizona Water Quality & Safety Report
46 ZIP codes · 166 water systems · UPC plumbing code · Updated 2026-03-16
Data: EPA SDWIS, NWS, State plumbing boards, Rewiring America Last verified: 2026-03-16
Overview
We track water quality, weather alerts, plumbing regulations, and energy rebates for 46 ZIP codes across Arizona, covering 166 community water systems that serve approximately 5,603,047 people.
46 of 46 ZIP codes (100%) have recorded EPA violations. 242 health-based violations have been documented.
Plumbing Regulations
Arizona follows the Uniform Plumbing Code (2018 edition).
- Plumbing code: UPC (2018)
- Homeowner DIY: Allowed with permit
- Water heater permit: Required
- Annual backflow test: Required
Energy & Water Rebates
Across 46 tracked ZIP codes in Arizona, residents have access to an average of 5 water-related rebate programs — including incentives for heat pump water heaters, efficient fixtures, and plumbing upgrades.
Check rebates for your ZIP code →
Areas with Most Violations
| ZIP Code | City | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|---|
| 86429 | Bullhead City | — | 1132 | 1 | BULLHEAD CITY MOHAVE |
| 85364 | Yuma | — | 503 | 38 | CITY OF YUMA |
| 85635 | Sierra Vista | — | 431 | 3 | BELLA VISTA CITY WATER SYSTEM |
| 85138 | Maricopa | — | 428 | 42 | GW SANTA CRUZ WATER CO |
| 85233 | Gilbert | — | 364 | 4 | GILBERT, TOWN OF |
| 86001 | Flagstaff | — | 332 | 0 | FLAGSTAFF CITY OF |
| 86336 | Sedona | — | 320 | 1 | ARIZONA WATER CO - SEDONA |
| 85117 | Apache Junction | — | 263 | 7 | ARIZONA WATER CO - APACHE JUNCTION |
| 85224 | Chandler | — | 259 | 4 | CHANDLER CITY OF |
| 85001 | Phoenix | — | 248 | 22 | PHOENIX CITY OF |
Lead & Copper
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
- High risk (Zone 1): 0 ZIP codes (0%)
- Moderate risk (Zone 2): 0 ZIP codes
- Low risk (Zone 3): 0 ZIP codes
All 46 ZIP Codes in Arizona
- 85117 (Apache Junction) — 263 violations ⚠
- 85123 (Arizona City) — 94 violations ⚠
- 85323 (Avondale) — 12 violations
- 85326 (Buckeye) — 38 violations
- 86429 (Bullhead City) — 1132 violations ⚠
- 85122 (Casa Grande) — 52 violations ⚠
- 85327 (Cave Creek) — 90 violations
- 85224 (Chandler) — 259 violations ⚠
- 85127 (Chandler Heights) — 6 violations
- 85128 (Coolidge) — 101 violations ⚠
- 85607 (Douglas) — 22 violations ⚠
- 85131 (Eloy) — 139 violations ⚠
- 86001 (Flagstaff) — 332 violations
- 85132 (Florence) — 109 violations ⚠
- 85268 (Fountain Hills) — 18 violations
- 85233 (Gilbert) — 364 violations ⚠
- 85301 (Glendale) — 51 violations ⚠
- 85338 (Goodyear) — 21 violations ⚠
- 85135 (Hayden) — 91 violations ⚠
- 85137 (Kearny) — 82 violations ⚠
- 86401 (Kingman) — 59 violations ⚠
- 86403 (Lake Havasu City) — 13 violations
- 85138 (Maricopa) — 428 violations ⚠
- 85201 (Mesa) — 38 violations
- 85621 (Nogales) — 237 violations ⚠
- 85345 (Peoria) — 42 violations
- 85001 (Phoenix) — 248 violations ⚠
- 85141 (Picacho) — 88 violations ⚠
- 86301 (Prescott) — 127 violations ⚠
- 86312 (Prescott Valley) — 124 violations
- 85346 (Quartzsite) — 27 violations
- 85142 (Queen Creek) — 70 violations ⚠
- 85145 (Red Rock) — 43 violations ⚠
- 85140 (San Tan Valley) — 90 violations
- 85250 (Scottsdale) — 34 violations
- 86336 (Sedona) — 320 violations ⚠
- 85635 (Sierra Vista) — 431 violations ⚠
- 85172 (Stanfield) — 92 violations ⚠
- 85351 (Sun City) — 22 violations
- 85375 (Sun City West) — 13 violations
- 85173 (Superior) — 11 violations
- 85374 (Surprise) — 159 violations ⚠
- 85280 (Tempe) — 55 violations ⚠
- 85701 (Tucson) — 214 violations ⚠
- 85358 (Wickenburg) — 26 violations
- 85364 (Yuma) — 503 violations ⚠
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Regulations: State plumbing boards, ICC, IAPMO
- Rebates: Rewiring America
Updated daily.