California (CA) Plumbing Code & Permit Rules
California Plumbing Code (based on UPC) (2022)
Data: State plumbing boards, ICC, IAPMO, EPA
Our reference data lists several plumbing requirements for California; confirm details with your local building department. Our regulation records list a licensed plumber for most work, annual backflow testing, and seismic strapping for water heaters; requirements vary by location and installation. Homeowners should budget for professional plumbing services and compliance costs.
Plumbing Code
California follows the California Plumbing Code (based on UPC) (2022 edition).
CPC = UPC with heavy California-specific amendments
Key Regulations
| Regulation | Status | Details |
|---|---|---|
| Plumbing Code | UPC (2022) | California Plumbing Code (based on UPC) |
| Homeowner DIY | Not allowed | Licensed contractor (C-36) generally required for plumbing work; owner-builder and minor-work exemptions may apply |
| Water Heater Permit | Required | Mandatory seismic straps (upper + lower); C-36 license required; inspections mandatory |
| Backflow Testing | Annual, required | Strict enforcement; all assemblies protecting public water supply |
| Seismic Strapping | Required | Water heater restraint |
DIY Plumbing in California
California requires a licensed plumber for most plumbing work. Licensed contractor (C-36) generally required for plumbing work; owner-builder and minor-work exemptions may apply
While this increases costs, it ensures:
- Work meets current code requirements
- Proper permitting and inspection
- Warranty and liability protection
- Safe connections to water and sewer systems
Backflow Prevention
California requires annual backflow testing to protect the public water supply from contamination. Testing must be performed by a SWRCB-certified tester (new cert required from July 1, 2025).
Non-compliance penalty: Water service may be shut off if testing is not completed on schedule.
Water Conservation Requirements
California has state-specific water conservation mandates. Most restrictive: max 1.8 GPM showerheads, 1.2 GPM faucets (CalGreen)
Lead Service Line Replacement
California is subject to EPA lead service line inventory and replacement requirements. $4.8B allocated for lead service line replacement (Prop 1)
Data Sources
- California 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 California?
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 California follow?
California follows the California Plumbing Code (based on UPC) (2022 edition) as of our last review; state and local amendments may apply.
Can I do my own plumbing work in California?
Our reference data lists California as requiring a licensed plumber for most plumbing work; homeowner exemptions may apply, so check state and local permit rules.
Do I need a permit to replace a water heater in California?
Permit rules for water heater replacement in California depend on the state and your local jurisdiction; check with your local building department. Check whether state and local rules require a licensed plumber for the installation.
Is backflow testing required in California?
Backflow testing requirements in California depend on the state code and your water utility; check with your utility about which assemblies must be tested and how often.
Does California require seismic strapping for water heaters?
Our reference data lists a seismic strapping requirement for water heaters in California; confirm it with your local building department. This typically involves two metal straps securing the water heater to the wall to prevent toppling during an earthquake.