Clean Water Act discharge permit · NPDES NDR050180
SLOULIN FIELD INTERNATIONAL AIRPORT, Williston, ND: NPDES NDR050180 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 7Pollutants under a numeric limit
- 0Pollutants with an effluent exceedance
SLOULIN FIELD INTERNATIONAL AIRPORT, held by City of Williston, holds NPDES permit NDR050180, which discharges to Lake Sakakawea. EPA’s file records it issued March 31, 2015 and expiring March 31, 2020. The status and dates are as EPA’s permit file stood when Velarion loaded it (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | SLOULIN FIELD INTERNATIONAL AIRPORT |
|---|---|
| Permittee as filed | City of Williston |
| NPDES ID | NDR050180 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Coverage under a general permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | March 31, 2015 |
| Expiration date | March 31, 2020 |
| Issuing agency | North Dakota Department of Environmental Quality |
| Address | Williston, ND 58802 |
| Receiving water | Lake Sakakawea |
| Subwatershed | Sloulin International Airport (HUC 101101010303) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 7Pollutants on file
- 7Under a numeric limit
- 7With 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 | 2 | 6 | 0 | ||
| BOD, 5-day, 20 deg. C | 1 | 3 | 0 | ||
| Oil & Grease | 1 | 3 | 0 | ||
| Nitrogen, ammonia total [as N] | 1 | 3 | 0 | ||
| Nitrogen, nitrate total [as N] | 1 | 3 | 0 | ||
| Chemical Oxygen Demand [COD] | 1 | 3 | 0 | ||
| Oil and grease visual | 1 | 3 | 0 |
EPA’s effluent violation file records no exceedance of a numeric limit for NPDES NDR050180.
Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.
Inspections, violations and enforcement
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES NDR050180.
Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.
Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.
Watch this permit
One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, NDR050180.
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EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID NDR050180 there.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.