Clean Water Act discharge permit · NPDES NDG421351
CARPIO CITY OF, Carpio, ND: NPDES NDG421351 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 12Pollutants under a numeric limit
- 0Pollutants with an effluent exceedance
- 1Inspections on file
- 0Formal enforcement actions
CARPIO CITY OF, held by Carpio City Of, holds NPDES permit NDG421351. EPA’s file records it issued September 30, 2025 and expiring December 31, 2027.
CARPIO CITY OF, Carpio, North Dakota: Coverage under a general permit NDG421351, held by Carpio City Of; Publicly owned treatment works; Effective; issued September 30, 2025, term to December 31, 2027, by North Dakota Department of Environmental Quality.
- pH: 4 limits, 8 violations of any kind, 0 effluent exceedances.
- Temperature, water deg. centigrade: 3 limits, 6 violations of any kind, 0 effluent exceedances.
- Stream flow, instantaneous: 3 limits, 6 violations of any kind, 0 effluent exceedances.
- Nitrogen, ammonia total [as N]: 3 limits, 6 violations of any kind, 0 effluent exceedances.
- BOD, 5-day, 20 deg. C: 2 limits, 4 violations of any kind, 0 effluent exceedances.
- Solids, total suspended: 2 limits, 4 violations of any kind, 0 effluent exceedances.
- E. coli: 2 limits, 4 violations of any kind, 0 effluent exceedances.
- Flow, total: 2 limits, 4 violations of any kind, 0 effluent exceedances.
- Chlorine, total residual: 3 limits, 3 violations of any kind, 0 effluent exceedances.
- Oil & Grease: 1 limit, 2 violations of any kind, 0 effluent exceedances.
- Flow, total: 1 limit, 2 violations of any kind, 0 effluent exceedances.
- Oil and grease visual: 1 limit, 2 violations of any kind, 0 effluent exceedances.
- June 25, 2026: Evaluation (S).
North Dakota holds 305 Publicly owned treatment works coverages of this permit type in EPA’s file; 302 were issued before NDG421351. Carpio City Of holds 2 permits in North Dakota.
Other permits held by Carpio City Of
- CARPIO CITY OF, Carpio: NDG221351, issued March 15, 2019
Coverages issued nearest NDG421351
- September 27, 2019: INTERNATIONAL PEACE GARDENS, Dunseith, NDG325852, held by International Peace Gardens
- September 27, 2019: NPS - PAINTED CANYON LAGOONS, Medora, NDG326425, held by Theodore Roosevelt National Park
- September 6, 2024: WARWICK LAGOON, Warwick, NDG589207, held by City of Warwick
- September 6, 2024: SELFRIDGE LAGOON, Selfridge, NDG589317, held by City of Selfridge
- September 6, 2024: SOLEN LAGOON, Solen, NDG589318, held by City of Solen
- March 2, 2026: OAKWOOD COLONY, Lisbon, NDG327058, held by Oakwood Hutterian Brethren Association
- May 20, 2026: VAC U JET SOUTH WWTP, Watford City, NDG427082, held by Brian Chilcott
CARPIO CITY OF among its neighbors
EPA’s permit file holds 2 discharge permits in the Oleaas Coulee-Des Lacs River subwatershed (HUC 090100020601), NDG421351 among them. Its county holds 97, 2 of them major permits; NDG421351 is a minor permit.
Other permits in the Oleaas Coulee-Des Lacs River subwatershed (HUC 090100020601)
- CARPIO CITY OF, Carpio: NDG221351, minor permit, discharging to Des Lacs, permit term to March 31, 2024
Identity
| Facility as filed | CARPIO CITY OF |
|---|---|
| Permittee as filed | Carpio City Of |
| NPDES ID | NDG421351 |
| Permit status | Effective |
| Permit type | Coverage under a general permit |
| Discharger class | Minor discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | September 30, 2025 |
| Expiration date | December 31, 2027 |
| Issuing agency | North Dakota Department of Environmental Quality |
| Address | Carpio, ND 58725 |
| Subwatershed | Oleaas Coulee-Des Lacs River (HUC 090100020601) |
Effluent limits and exceedances
- 12Pollutants on file
- 12Under a numeric limit
- 12With a violation of any kind
- 0With an effluent exceedance
An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| pH | 4 | 8 | 0 | ||
| Temperature, water deg. centigrade | 3 | 6 | 0 | ||
| Stream flow, instantaneous | 3 | 6 | 0 | ||
| Nitrogen, ammonia total [as N] | 3 | 6 | 0 | ||
| BOD, 5-day, 20 deg. C | 2 | 4 | 0 | ||
| Solids, total suspended | 2 | 4 | 0 | ||
| E. coli | 2 | 4 | 0 | ||
| Flow, total | 2 | 4 | 0 | ||
| Chlorine, total residual | 3 | 3 | 0 | ||
| Oil & Grease | 1 | 2 | 0 | ||
| Flow, total | 1 | 2 | 0 | ||
| Oil and grease visual | 1 | 2 | 0 |
EPA’s effluent violation file records no exceedance of a numeric limit for NPDES NDG421351.
Inspections, violations and enforcement
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES NDG421351.
Inspections
| Date | What EPA recorded | Agency |
|---|---|---|
| June 25, 2026 | Evaluation | S |
Formal enforcement and penalties
0 formal actions, 0 of them with a penalty assessed. Federal and state penalties are separate figures from separate authorities and are shown as each was filed, never added together.
Informal enforcement
EPA’s informal enforcement file holds no action for NPDES NDG421351.
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.