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Clean Water Act discharge permit · NPDES NDR320921

RHEX BUFFALO SANDS MINE, Hazen, ND: NPDES NDR320921 discharge permit, effluent exceedances, inspections, penalties

RHEX BUFFALO SANDS MINE, held by Ramsey Hill Exploration LLC, holds NPDES permit NDR320921, which discharges to Knife. EPA’s file records it issued December 13, 2024 and expiring December 31, 2029. 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.

What the register holds for RHEX BUFFALO SANDS MINE: its NPDES ID, its permit type and status, its dates, its address in Hazen, North Dakota, its receiving water, and 3 pollutants under a numeric limit. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES NDR320921.

Identity

Facility as filedRHEX BUFFALO SANDS MINE
Permittee as filedRamsey Hill Exploration LLC
NPDES IDNDR320921
Permit statusEffective
Permit typeCoverage under a general permit
Discharger classMinor discharger
Facility typeNot a publicly owned treatment works
IssuedDecember 13, 2024
Expiration dateDecember 31, 2029
Issuing agencyNorth Dakota Department of Environmental Quality
AddressHazen, ND 58545
Receiving waterKnife
SubwatershedCambridge Cemetery (HUC 101302011107)
NAICS212322 – Industrial Sand Mining
SIC1446 – Industrial Sand

Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download.

Effluent limits and exceedances

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 measureLimitsViolations, any kindEffluent exceedancesLatest exceedanceLargest exceedance, as filed
Solids, total suspended300
pH200
Nitrite + Nitrate total [as N]100

EPA’s effluent violation file records no exceedance of a numeric limit for NPDES NDR320921.

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

EPA’s single-event violation file, as loaded, holds no violation for NPDES NDR320921.

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.

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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 NDR320921 there.

Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.

What this page shows

This public-records page covers NPDES permit NDR320921 for RHEX BUFFALO SANDS MINE in Hazen, ND, held by Ramsey Hill Exploration LLC, with an effective status and a minor discharger classification. The page lists 0 pollutants under a numeric limit and 0 pollutants with an effluent exceedance, and it reports the permit as issued December 13, 2024 and expiring December 31, 2029.