Colorado (CO) Plumbing Code & Permit Rules
International Plumbing Code (2021)
Data: State plumbing boards, ICC, IAPMO, EPA
Check Colorado and local rules for homeowner plumbing permits and backflow testing requirements.
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. State water-efficiency (WaterSense) requirements apply to certain plumbing fixtures; check current state rules for which fixtures are covered
Lead Service Line Replacement
Colorado is subject to EPA lead service line inventory and replacement requirements.
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) as of our last review; state and local amendments may apply.
Can I do my own plumbing work in Colorado?
Homeowners in Colorado may be allowed to do plumbing work on their primary residence; check state and local permit rules before starting.
Do I need a permit to replace a water heater in Colorado?
Permit rules for water heater replacement in Colorado depend on the state and your local jurisdiction; check with your local building department. Homeowners may be able to do the work themselves with a permit.
Is backflow testing required in Colorado?
Backflow testing requirements in Colorado depend on the state code and your water utility; check with your utility about which assemblies must be tested and how often.
Does Colorado require seismic strapping for water heaters?
We have no statewide seismic strapping requirement for water heaters on record for Colorado; local building codes may still require it, so check with your local building department. Strapping remains a prudent option in areas with seismic activity.