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Clean Water Act discharge permit · NPDES CO0031399

MONARCH SKI AREA, Chaffee County, CO: NPDES CO0031399 discharge permit, effluent exceedances, inspections, penalties

MONARCH SKI AREA, held by PowderMonarch LLC, holds NPDES permit CO0031399, which discharges to South Fork Arkansas River. EPA’s file records it issued February 4, 2011 and expiring March 31, 2016.

MONARCH SKI AREA, Chaffee County, Colorado: Individual permit CO0031399, held by PowderMonarch LLC; Effective; issued February 4, 2011, term to March 31, 2016; discharges to SOUTH FORK ARKANSAS RIVER.

  • Chloride [as Cl]: 1 limit, 8 violations of any kind, 8 effluent exceedances, latest April 30, 2026, largest 76% over the limit.
  • Nitrogen, inorganic total: 1 limit, 6 violations of any kind, 6 effluent exceedances, latest June 30, 2026, largest 1,319% over the limit.
  • Flow, in conduit or thru treatment plant: 4 limits, 6 violations of any kind, 0 effluent exceedances.
  • BOD, 5-day, 20 deg. C: 6 limits, 5 violations of any kind, 0 effluent exceedances.
  • Solids, total suspended: 4 limits, 3 violations of any kind, 0 effluent exceedances.
  • Plant capacity fact. percent of capacity: 2 limits, 1 violation of any kind, 0 effluent exceedances.
  • BOD, 5-day, percent removal: 1 limit, 1 violation of any kind, 0 effluent exceedances.
  • Solids, suspended percent removal: 1 limit, 1 violation of any kind, 0 effluent exceedances.
  • Nitrogen, ammonia total [as N]: 24 limits, 0 violations of any kind, 0 effluent exceedances.
  • pH: 2 limits, 0 violations of any kind, 0 effluent exceedances.
  • Chlorine, total residual: 2 limits, 0 violations of any kind, 0 effluent exceedances.
  • E. coli: 2 limits, 0 violations of any kind, 0 effluent exceedances.
  • Oil and grease: 1 limit, 0 violations of any kind, 0 effluent exceedances.
  • Sulfide-hydrogen sulfide [undissociated]: 1 limit, 0 violations of any kind, 0 effluent exceedances.
  • Sulfate: 1 limit, 0 violations of any kind, 0 effluent exceedances.
  • Oil and grease visual: 1 limit, 0 violations of any kind, 0 effluent exceedances.
  • August 21, 2026: Letter of Violation/ Warning Letter (State).
  • June 19, 2026: Letter of Violation/ Warning Letter (State).
  • May 15, 2026: Letter of Violation/ Warning Letter (State).
  • April 17, 2026: Letter of Violation/ Warning Letter (State).
  • March 13, 2026: Letter of Violation/ Warning Letter (State).
  • March 12, 2025: Reporting Violations - Improper/ Incorrect Reporting (ST6).
  • March 12, 2025: Monitoring Violations - Failure to Monitor for Non-Toxicity Requirements (ST6).

Other permits held by PowderMonarch LLC

MONARCH SKI AREA among its neighbors

EPA’s permit file holds 7 discharge permits in the Middle Fork South Arkansas River subwatershed (HUC 110200010601), CO0031399 among them. Its county holds 64, 1 of them major permits; CO0031399 is a minor permit.

Other permits in the Middle Fork South Arkansas River subwatershed (HUC 110200010601)

  • BECHCO ENTERPRISES LLC, Gunnison: COL621004, minor permit, permit term to December 31, 2025
  • LILY MINES, Garfield (Historical): COG501986, minor permit, discharging to Taylor Gulch - South Arkansas River, permit term to December 31, 2021
  • MONARCH MOUNTAIN LODGE WASTWATER COMPANY, Monarch: CO0028444, minor permit, discharging to South Fork of Arkasas River, permit term to April 30, 2012
  • MONARCH QUARRY, Salida: COG501864, minor permit, discharging to South Arkansas River, permit term to December 31, 2021
  • PARADISE PARKING LOT, Salida: COR430955, minor permit, permit term to March 31, 2029
  • SALIDA HYDRO DAM DEMOLITION, Salida: COR423713, minor permit, permit term to March 31, 2029

Identity

Facility as filedMONARCH SKI AREA
Permittee as filedPowderMonarch LLC
NPDES IDCO0031399
Permit statusEffective
Permit typeIndividual permit
Discharger classMinor discharger
Facility typeNot a publicly owned treatment works
IssuedFebruary 4, 2011
Expiration dateMarch 31, 2016
AddressChaffee County, CO 81227
Receiving waterSOUTH FORK ARKANSAS RIVER
SubwatershedMiddle Fork South Arkansas River (HUC 110200010601)

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
Chloride [as Cl]188April 30, 202676% over the limit
Nitrogen, inorganic total166June 30, 20261,319% over the limit
Flow, in conduit or thru treatment plant460
BOD, 5-day, 20 deg. C650
Solids, total suspended430
Plant capacity fact. percent of capacity210
BOD, 5-day, percent removal110
Solids, suspended percent removal110
Nitrogen, ammonia total [as N]2400
pH200
Chlorine, total residual200
E. coli200
Oil and grease100
Sulfide-hydrogen sulfide [undissociated]100
Sulfate100
Oil and grease visual100

Inspections, violations and enforcement

DateWhat EPA recordedAgency
March 12, 2025Reporting Violations - Improper/ Incorrect ReportingST6
March 12, 2025Monitoring Violations - Failure to Monitor for Non-Toxicity RequirementsST6

Inspections

EPA’s inspection file holds no inspection for NPDES CO0031399.

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

DateWhat EPA recordedAgency
August 21, 2026Letter of Violation/ Warning LetterState
June 19, 2026Letter of Violation/ Warning LetterState
May 15, 2026Letter of Violation/ Warning LetterState
April 17, 2026Letter of Violation/ Warning LetterState
March 13, 2026Letter of Violation/ Warning LetterState

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Nearby on the register

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

What this page shows

This public-records page covers the Clean Water Act discharge permit NPDES CO0031399 for MONARCH SKI AREA in Chaffee County, CO, held by PowderMonarch LLC and discharging to the SOUTH FORK ARKANSAS RIVER. The permit is listed as Effective and as an individual permit for a minor discharger, issued February 4, 2011 and expiring March 31, 2016. The page lists 16 pollutants on file, 8 with a violation of any kind, 2 with an effluent exceedance, and 2 under a numeric limit.