Arizona Cities With the Lowest Water Scores
Arizona cities whose tap water scores lowest on our 0-100 Water Score, derived from EPA records.
243 cities on this list · updated 2026
| # | City | Water Score |
|---|---|---|
| 1 | Kingmantop: Arsenic | 35/100 |
| 2 | Maricopatop: Nitrate | 38/100 |
| 3 | Stanfieldtop: Nitrate | 40/100 |
| 4 | Tucsontop: Nitrate | 42/100 |
| 5 | New Rivertop: Arsenic | 46/100 |
| 6 | Yumatop: Arsenic | 49/100 |
| 7 | Casa Grandetop: Arsenic | 51/100 |
| 8 | Apache Junctiontop: Nitrate | 51/100 |
| 9 | Bullhead Citytop: Nitrate | 53/100 |
| 10 | Florencetop: Arsenic | 53/100 |
| 11 | Peoriatop: Nitrate | 54/100 |
| 12 | Salometop: Fluoride | 54/100 |
| 13 | Prescotttop: Uranium | 55/100 |
| 14 | Eloytop: Nitrate | 57/100 |
| 15 | Chandlertop: Arsenic | 59/100 |
| 16 | Flagstafftop: Arsenic | 59/100 |
| 17 | Gilberttop: Total Trihalomethanes (TTHM) | 60/100 |
| 18 | Litchfield Parktop: Total Trihalomethanes (TTHM) | 62/100 |
| 19 | Paysontop: Nitrate | 62/100 |
| 20 | Kearnytop: Total Trihalomethanes (TTHM) | 63/100 |
| 21 | Cartertop: Nitrate | 63/100 |
| 22 | Buckeyetop: Haloacetic Acids (HAA5) | 65/100 |
| 23 | Camp Verdetop: Arsenic | 67/100 |
| 24 | Cornvilletop: Nitrate | 67/100 |
| 25 | Centennial Parktop: Radium (combined -226 & -228) | 67/100 |
| 26 | Phoenixtop: Arsenic | 69/100 |
| 27 | Johnson Ranchtop: Nitrate | 69/100 |
| 28 | Sedonatop: Arsenic | 69/100 |
| 29 | Goodyeartop: Haloacetic Acids (HAA5) | 70/100 |
| 30 | Wendentop: Arsenic | 70/100 |
Methodology. Ranked by our 0-100 Water Score (lower = more on the EPA record), computed from SDWIS violations and PFAS monitoring. Built from public U.S. EPA drinking-water records (SDWIS violations + UCMR5 PFAS monitoring) for community water systems. A higher count or a lower Water Score reflects what's on the federal record — not a judgment of any utility. Meeting legal limits is not the same as zero risk.
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