Southwest WWTF
SW Of Town, E Of Hwy 160/666, Cortez, CO 81321 · Montezuma County · Publicly Owned Treatment Works
- Average flow
- 0.82 MGD
- Design flow
- 1.57 MGD
- NPDES permit
- CO0027545
- Administratively continued
- Permit expires
- January 2018
- Population served
- 8,762
- CWNS 2022
Southwest WWTF is a publicly owned wastewater treatment works in Cortez, Montezuma County, Colorado treating an average of 0.82 million gallons per day against a permitted design capacity of 1.57 MGD, serving about 8,762 residents. It discharges under NPDES permit CO0027545 (administratively continued), which expires in January 2018, with 0 recorded violations in the last three years. EPA has recorded 1 formal enforcement action naming the plant, the latest in April 2003.
Treatment technology
One treatment structure or unit process identified at Southwest WWTF.
Available with a free Klarifi account
See the full treatment train at Southwest WWTF: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 0
- Effluent violations
- 0
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
EPA enforcement history
Federal civil enforcement cases, compliance inspections and informal actions recorded for Southwest WWTF in EPA's ICIS system.
- Formal actions
- 1
- 0 since FY2020
- Compliance actions
- $700
- required by EPA orders
- EPA inspections
- 0
- none on record
Latest case · Apr 2003
Cortez Sanitation District
Administrative order · CWA, Sewage Sludge Disposal · Final Order No Penalty · Compliance actions $700
EPA's description of the case:
“EPA issued a general permit, effective 8/16/2002, for facilities in Colorado and Indian country that generate, treat, and/or use or dispose of sewage sludge by land application, landfill, and surface…”
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Source: EPA ECHO, civil enforcement case 08-2003-0089.
Full case history with a free Klarifi account
Every action against Southwest WWTF with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Key contacts
Decision-makers at Southwest WWTF.
No verified contacts on file yet
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Nearby wastewater treatment plants in Colorado
Dolores · 11 mi away
0.11 MGD
Mancos · 17 mi away
0.11 MGD
Durango · 45 mi away
0.08 MGD
Ignacio · 56 mi away
0.31 MGD
Bayfield · 59 mi away
0.07 MGD
Telluride · 59 mi away
1.05 MGD
Silverton · 61 mi away
0.11 MGD
Nucla · 65 mi away
0.08 MGD
Southwest WWTF: frequently asked questions
Sources and methodology
Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.
Data refreshed October 26, 2026; facility record last updated May 15, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Equalization tank · Centrate · all terms