| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026-1743 | IA6000744 | LYON-SIOUX RWS-BOYDEN | C | A | Monitoring (Chem-Rad), Routine Major | MON | Nitrate (as N) | 01/01/2026 | 03/31/2026 | ROCK RAPIDS | LYON | FO3 | 605 |
| 2026-1705 | IA4535081 | LIME SPRINGS WATER SUPPLY | C | A | Monitoring (RTCR), Routine Major | MON | Revised Total Coliform Rule (RTCR) | 03/01/2026 | 03/31/2026 | LIME SPRINGS | HOWARD | FO1 | 473 |
| 2026-1698 | IA3100823 | GAVIN ESTATES | C | A | Monitoring (RTCR), Routine Major | MON | Revised Total Coliform Rule (RTCR) | 03/01/2026 | 03/31/2026 | DUBUQUE | DUBUQUE | FO1 | 52 |
| 2026-1780 | IA3126206 | DERBY GRANGE GOLF INC | NC | A | Monitoring (RTCR), Routine Major | MON | Revised Total Coliform Rule (RTCR) | 03/01/2026 | 03/31/2026 | DUBUQUE | DUBUQUE | FO1 | 200 |
| 2026-1190 | IA2742076 | LEON WATER SUPPLY | C | A | MCL (Chem-Rad), Average | MCL | Total Haloacetic Acids (HAA5) | 01/01/2026 | 03/31/2026 | LEON | DECATUR | FO5 | 1830 |
| 2026-1189 | IA2742076 | LEON WATER SUPPLY | C | A | MCL (Chem-Rad), Average | MCL | Total Haloacetic Acids (HAA5) | 01/01/2026 | 03/31/2026 | LEON | DECATUR | FO5 | 1830 |