REGULATIONS IPC DIY ALLOWED

Colorado Plumbing Code & DIY Rules

International Plumbing Code (2021)

Data sources: State plumbing boards, ICC, IAPMO, EPA Last verified: 2026-03-16

IPC
Plumbing Code
Required
Annual Backflow Test
Yes
Homeowner DIY
Yes
Water Heater Permit

Plumbing Code

Colorado follows the International Plumbing Code (2021 edition).

The IPC (International Plumbing Code) is maintained by the International Code Council (ICC) and is adopted by approximately 35 states. It covers water supply, drainage, fixtures, and cross-connection control.

Backflow Prevention Testing

Annual testing is required in Colorado for testable backflow prevention assemblies (RPZ, DCVA, PVB).

  • Residential: Yes — required for homes with irrigation systems or other cross-connections
  • Who can test: State-certified tester
  • Enforcement: CDPHE regulations; local water utilities enforce

Water Heater Installation

A permit is required to replace or install a water heater in Colorado.

  • Licensed plumber required: No — homeowner exemption available
  • Homeowner can DIY: Yes, for primary residence (permit still required in most areas)
  • Note: Homeowner exemption for primary residence; inspection still required

Universal requirements (all states):

  • Temperature & Pressure Relief (TPR) valve must be installed
  • Discharge pipe from TPR must terminate safely
  • Gas water heaters: proper venting required
  • Minimum 18" clearance from floor for gas heaters in garages
  • Expansion tank often required when backflow preventer is installed on main supply

Homeowner DIY Plumbing Rights

Colorado allows homeowners to perform plumbing work on their primary residence.

Homeowner can do own work on primary residence with permit

Water Conservation Requirements

Colorado has state-level water conservation requirements that exceed federal minimums.

WaterSense required for many new construction permits

Lead Service Line Replacement

Under the revised EPA Lead and Copper Rule (2021), Colorado is required to inventory lead service lines and develop replacement plans.

Following EPA Lead and Copper Rule 2021

Important Disclaimer

This information is provided as a general overview. Plumbing codes and regulations can vary significantly between municipalities within Colorado. Always check with your local building department before starting any plumbing work. Local codes override state minimums — your city or county may have stricter requirements.

Sources

  • State plumbing boards and licensing agencies
  • International Code Council (ICC) — IPC adoption map
  • International Association of Plumbing and Mechanical Officials (IAPMO) — UPC adoption
  • EPA Safe Drinking Water Act — Cross-Connection Control Program
  • State building departments
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