Clean Water Act discharge permit · NPDES NDR050814

WILLISTON BASIN INTERNATIONAL AIRPORT(XWA), Williston, ND: NPDES NDR050814 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
6Pollutants under a numeric limit
0Pollutants with an effluent exceedance

WILLISTON BASIN INTERNATIONAL AIRPORT(XWA), held by City of Williston, holds NPDES permit NDR050814, which discharges to Little Muddy. EPA’s file records it issued March 30, 2020 and expiring March 31, 2025. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

Identity

Facility as filed	WILLISTON BASIN INTERNATIONAL AIRPORT(XWA)
Permittee as filed	City of Williston
NPDES ID	NDR050814
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
Program	Industrial stormwater
Issued	March 30, 2020
Expiration date	March 31, 2025
Issuing agency	North Dakota Department of Environmental Quality
Address	Williston, ND 58801
Receiving water	Little Muddy
Subwatershed	Sand Creek (HUC 101101010302)

Cited to the EPA ICIS-NPDES permit file (ECHO download).

Effluent limits and exceedances

10Pollutants on file
6Under a numeric limit
10With 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
pH	12	72
BOD, 5-day, 20 deg. C	6	36
Oil & Grease	6	36
Nitrogen, ammonia total [as N]	6	36
Chemical Oxygen Demand [COD]	6	36
Oil and grease visual	6	36
Dry days preceding precipitation event	0	30
Rainfall duration	0	30
Rainfall	0	30
Date of Storm Event	0	30

EPA’s effluent violation file records no exceedance of a numeric limit for NPDES NDR050814.

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 NDR050814.

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, NDR050814.

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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 NDR050814 there.

Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.

This public-records page covers Clean Water Act NPDES permit NDR050814 for Williston Basin International Airport (XWA) in Williston, ND, held by the City of Williston, which discharges to Little Muddy within the Sand Creek subwatershed (HUC 101101010302). The page lists a permit status of Administratively continued, a Minor Discharger class of 6, and 0 pollutants under a numeric limit and 0 pollutants with an effluent exceedance.