| Violation ID | PWS ID | PWS Name | PWS Type | PWS Activity Status | Violation Name | Violation Category | Analyte Name | Compliance Begin Date | Compliance End Date | City | County | Field Office | Population Served |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026-2158 | IA9506200 | THE BARN (BUFFALO CENTER) | NC | A | MCL, EC+ (RTCR) | MCL | Revised Total Coliform Rule (RTCR) | 06/01/2026 | 06/30/2026 | BUFFALO CENTER | WINNEBAGO | FO2 | 60 |
| 2026-1833 | IA8156028 | SCHALLER WATER SUPPLY | C | A | MCL (Chem-Rad), Single Sample | MCL | Nitrite (as N) | 04/01/2026 | 06/30/2026 | SCHALLER | SAC | FO3 | 729 |
| 2026-2120 | IA7930008 | GRINNELL WATER DEPARTMENT | C | A | MCL (Chem-Rad), Average | MCL | Radium, Combined (226, 228) | 04/01/2026 | 06/30/2026 | GRINNELL | POWESHIEK | FO5 | 9564 |
| 2026-1844 | IA5200802 | KESSLERS HOMEOWNERS ASSN | C | A | MCL (Chem-Rad), Average | MCL | Radium, Combined (226, 228) | 04/01/2026 | 06/30/2026 | IOWA CITY | JOHNSON | FO6 | 60 |
| 2026-1858 | IA8055014 | MOUNT AYR WATER TREATMENT PLANT | C | A | MCL (Chem-Rad), Average | MCL | Total Haloacetic Acids (HAA5) | 04/01/2026 | 06/30/2026 | MOUNT AYR | RINGGOLD | FO4 | 1683 |
| 2026-2101 | IA2742076 | LEON WATER SUPPLY | C | A | MCL (Chem-Rad), Average | MCL | Total Haloacetic Acids (HAA5) | 04/01/2026 | 06/30/2026 | LEON | DECATUR | FO5 | 1830 |