Skip to main content
U.S. flag

An official website of the United States government

Here’s how you know

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

HTTPS

Secure .gov websites use HTTPS
A lock (LockA locked padlock) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

    • Environmental Topics
    • Air
    • Bed Bugs
    • Chemicals, Toxics, and Pesticide
    • Emergency Response
    • Environmental Information by Location
    • Health
    • Land, Waste, and Cleanup
    • Lead
    • Mold
    • Radon
    • Research
    • Science Topics
    • Water Topics
    • A-Z Topic Index
    • Laws & Regulations
    • By Business Sector
    • By Topic
    • Compliance
    • Enforcement
    • Guidance
    • Laws and Executive Orders
    • Regulations
    • Report a Violation
    • Environmental Violations
    • Fraud, Waste or Abuse
    • About EPA
    • Our Mission and What We Do
    • Headquarters Offices
    • Regional Offices
    • Labs and Research Centers
    • Planning, Budget, and Results
    • Organization Chart
    • EPA History

Breadcrumb

  1. Home
  2. NPDES Permits Around the Nation

NPDES Permit for Downing Reservoir Groundwater Treatment System in Colorado

Under National Pollutant Discharge Elimination System permit number CO-0035033, the U.S. General Services Administration is authorized to discharge wastewater from its Downing Reservoir Ground Water Treatment System located at the Denver Federal Center in Lakewood, Jefferson County, Colorado, to McIntyre Gulch, tributary to Lakewood Gulch, tributary to the South Platte River.


Current Permit

  • CO0035033 Downing Reservoir Groundwater Treatment System NPDES Permit (pdf) (517.23 KB, October 20, 2025)
    The NPDES discharge permit.
  • CO0035033 Downing Reservoir Groundwater Treatment System Statement of Basis (pdf) (1.27 MB, October 20, 2025)
    The statement of basis for the NPDES discharge permit.
Contact us about NPDES permits around the nation to ask a question, provide feedback, or report a problem.
Last updated on October 20, 2025
  • Assistance
  • Spanish
  • Arabic
  • Chinese (simplified)
  • Chinese (traditional)
  • French
  • Haitian Creole
  • Korean
  • Portuguese
  • Russian
  • Tagalog
  • Vietnamese
United States Environmental Protection Agency

Discover.

  • Accessibility Statement
  • Budget & Performance
  • Contracting
  • EPA www Web Snapshot
  • Grants
  • No FEAR Act Data
  • Plain Writing
  • Privacy and Security Notice

Connect.

  • Data
  • Inspector General
  • Jobs
  • Newsroom
  • Regulations.gov
  • Subscribe
  • USA.gov
  • White House

Ask.

  • Contact EPA
  • EPA Disclaimers
  • Hotlines
  • FOIA Requests
  • Frequent Questions
  • Site Feedback

Follow.