San Luis Obispo County, CA Building Safety: Plumbing Permits (2026)
Key Facts
- Admin rules
- Follow CBC Chapter 1, same as building permits
- Adopted appendices
- Appendix A (water sizing), Appendix H Table 201.1(4)
- Cross-connection control
- Backflow device required to prevent supply contamination
- Related chapter
- County Code Ch. 8.30, Cross-Connections Control
- Citation
- Sec. 19.07.010(a)-(d), amending CPC Sec. 603.0
Summary
San Luis Obispo County adopts the California Plumbing Code and, like the electrical code, folds its permitting into the building code's Chapter 1 rules. Section 19.07.010 substitutes Chapter 1 of the California Building Code for the plumbing code's own administration division and separately strengthens cross-connection control to protect the domestic water supply from backflow contamination.
(a)Delete Division II—Administration see 19.02.020. Administration of the Plumbing Code shall be as set forth in Chapter 1 of the California Building Code.(b)Adopt Appendix A, Recommended Rules For Sizing The Water Supply System.(c)Adopt Appendix H Table H 201.1(4). Estimated Waste/Sewage Flow Rates.(d)Amend Section 603.0 to read as follows: 603.0 Cross-Connection Control. Cross-connection control shall be provided in accordance with the provisions of this chapter and Chapter 8.30 of the San Luis Obispo County Code (Cross-Connections Control and Inspections). No person shall install any water-operated equipment or mechanism, or use any water-treating chemical or substance, if it is found that such equipment, mechanism, chemical or substance may cause pollution or contamination of the domestic water supply. Such equipment or mechanism may be permitted only with an approved backflow prevention device or assembly.
Full Breakdown
1 before anyone installs, alters, or replaces a regulated plumbing system. 1(4), the estimated waste and sewage flow rate table designers use to size drainage and disposal systems. 30 of the San Luis Obispo County Code (Cross-Connections Control and Inspections), and bars anyone from installing water-operated equipment or using a water-treating chemical that could pollute or contaminate the domestic water supply unless it carries an approved backflow prevention device or assembly. 07 goes on to regulate private sewage disposal (onsite wastewater treatment systems), toilet facilities required for construction workers on a graduated table by employee count, and the minimum water supply and well capacity a building permit for a new dwelling must show before it issues.
Violations & Fines
Installing, altering, or replacing a plumbing system without a permit under Section 105.1, folded into the Plumbing Code by Section 19.07.010(a), is unpermitted work referred to code enforcement the same as any other unpermitted construction. Installing water-operated equipment, a water-treating chemical, or a substance that could pollute or contaminate the domestic water supply without an approved backflow prevention device or assembly violates the amended Cross-Connection Control standard in Section 603.0.
Frequently Asked Questions
Does SLO County have a separate plumbing permit process from its building permits?
What backflow protection does the county require on water-treating equipment?
Which appendices of the Plumbing Code does the county add for sizing water and sewage systems?
Sources & Official References
Other rules in San Luis Obispo County
California rules heatmap·Compare San Luis Obispo County to another location·View the California building safety overview
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