Colorado (CO) Plumbing Code & Permit Rules
International Plumbing Code (2021) · Updated 2026-05-31
Data: State plumbing boards, ICC, IAPMO, EPA Last verified: 2026-05-31
Colorado allows homeowner DIY plumbing with permits, though annual backflow testing is still required. This balanced approach gives homeowners flexibility while maintaining water quality standards.
Plumbing Code
Colorado follows the International Plumbing Code (2021 edition).
Key Regulations
| Regulation | Status | Details |
|---|---|---|
| Plumbing Code | IPC (2021) | International Plumbing Code |
| Homeowner DIY | Allowed | Homeowner can do own work on primary residence with permit |
| Water Heater Permit | Required | Homeowner exemption for primary residence; inspection still required |
| Backflow Testing | Annual, required | |
| Seismic Strapping | Not required | Water heater restraint |
DIY Plumbing in Colorado
Colorado allows homeowners to perform plumbing work on their primary residence. A permit is required for most work beyond minor repairs.
Common DIY-allowed projects (with permit):
- Replacing faucets and fixtures
- Installing shut-off valves
- Replacing toilet components
- Minor drain repairs
Projects that typically require a licensed plumber:
- New water line installation
- Sewer line repair or replacement
- Gas line connections
- Backflow preventer installation
Backflow Prevention
Colorado requires annual backflow testing to protect the public water supply from contamination. Testing must be performed by a State-certified tester.
Non-compliance penalty: Water service may be shut off if testing is not completed on schedule.
Water Conservation Requirements
Colorado has state-specific water conservation mandates. WaterSense required for many new construction permits
Lead Service Line Replacement
Colorado has an active lead service line replacement program. Following EPA Lead and Copper Rule 2021
Data Sources
- Colorado state plumbing board and licensing agency
- International Code Council (ICC)
- IAPMO
- EPA Safe Drinking Water Act
Updated as regulations change.
Need a licensed plumber in Colorado?
Plumbing regulations vary by city. Connect with a licensed professional who knows your local code requirements.
Find a Licensed Plumber →Frequently Asked Questions
What plumbing code does Colorado follow?
Colorado follows the International Plumbing Code (2021 edition).
Can I do my own plumbing work in Colorado?
Yes, homeowners in Colorado can perform plumbing work on their primary residence with proper permits.
Do I need a permit to replace a water heater in Colorado?
Yes, Colorado requires a permit for water heater replacement. Homeowners may be able to do the work themselves with a permit.
Is backflow testing required in Colorado?
Yes, Colorado requires annual backflow testing.
Does Colorado require seismic strapping for water heaters?
No, Colorado does not require seismic strapping for water heaters. However, they remain a prudent option in areas with seismic activity.