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Clean Water Act discharge permit · NPDES COR427420

SOUTHWEST AREA RIGHT OF WAY IMPROVEMENTS, Telluride, CO: NPDES COR427420 discharge permit, effluent exceedances, inspections, penalties

SOUTHWEST AREA RIGHT OF WAY IMPROVEMENTS, held by OLDCASTLE SW GROUP, INC. dba United Companies, holds NPDES permit COR427420. EPA’s file records it issued May 9, 2025 and expiring March 31, 2029.

SOUTHWEST AREA RIGHT OF WAY IMPROVEMENTS, Telluride, Colorado: Coverage under a general permit COR427420, held by OLDCASTLE SW GROUP, INC. dba United Companies; Effective; issued May 9, 2025, term to March 31, 2029.

Other permits held by OLDCASTLE SW GROUP, INC. dba United Companies

SOUTHWEST AREA RIGHT OF WAY IMPROVEMENTS among its neighbors

EPA’s permit file holds 23 discharge permits in the Headwaters San Miguel River subwatershed (HUC 140300030106), COR427420 among them. Its county holds 44, 1 of them major permits; COR427420 is a minor permit.

Other permits in the Headwaters San Miguel River subwatershed (HUC 140300030106)

  • ALEXANDER PIT, Telluride: COG501813, minor permit, discharging to San Miguel River, permit term to December 31, 2021
  • DAVIS ST PRESSURE REDUCING VALVE (PRV), Telluride: COG317252, minor permit, discharging to Cornet Creek & San Miguel River, permit term to May 31, 2028
  • DEEP CREEK MESA RANCH ROAD, Telluride: COR429463, minor permit, permit term to March 31, 2029
  • ILLIUM VALLEY WWTF, Telluride: COG590021, minor permit, discharging to San Miguel River, permit term to March 31, 2026
  • LAST DOLLAR WWTF, San Miguel County: COG588005, minor permit, discharging to SAN MIGUEL RIVER, permit term to May 31, 2010
  • LAST DOLLAR WWTF, San Miguel County: COG589153, minor permit, discharging to San Miguel River, permit term to September 30, 2023
  • LAWSON HILL PUD ILLIUM VALLEY WWTF, San Miguel County: COG588021, minor permit, discharging to SAN MIGUEL RIVER, permit term to May 31, 2010
  • LOT 161-CRR TMV, Mountain Village: COG081224, minor permit, discharging to Village Pond and Goronno Creek, permit term to May 31, 2028
  • LOT 161-CRR TMV, Mountain Village: COR426541, minor permit, permit term to March 31, 2029
  • MILL CREEK PUD, Telluride: COR430611, minor permit, permit term to March 31, 2029

What the register holds for SOUTHWEST AREA RIGHT OF WAY IMPROVEMENTS: its NPDES ID, its permit type and status, its dates, its address in Telluride, Colorado. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES COR427420.

Identity

Facility as filedSOUTHWEST AREA RIGHT OF WAY IMPROVEMENTS
Permittee as filedOLDCASTLE SW GROUP, INC. dba United Companies
NPDES IDCOR427420
Permit statusEffective
Permit typeCoverage under a general permit
Discharger classMinor discharger
Facility typeNot a publicly owned treatment works
IssuedMay 9, 2025
Expiration dateMarch 31, 2029
AddressTelluride, CO 81435
SubwatershedHeadwaters San Miguel River (HUC 140300030106)

Effluent limits and exceedances

EPA’s limits and effluent violation files hold no pollutant row for NPDES COR427420.

Inspections, violations and enforcement

EPA’s single-event violation file, as loaded, holds no violation for NPDES COR427420.

Inspections

EPA’s inspection file holds no inspection for NPDES COR427420.

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 COR427420.

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Nearby on the register

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

What this page shows

The SOUTHWEST AREA RIGHT OF WAY IMPROVEMENTS permit is one of 40 general permit coverages in San Miguel County, and 65.0% of those coverages carry an earlier issue date than this one. Among the 23 NPDES permits in the Headwaters San Miguel River subwatershed, this permit is counted alongside the rest, and its record shows zero pollutants under a numeric limit and zero pollutants with an effluent exceedance.