Petaluma, CA Landscaping Rules: Rainwater Harvesting (2026)
Key Facts
- Rainwater catchment water use
- Exempt from water waste rules
- Exemption section
- PMC § 15.17.070(D)
- Design disclosure required
- PMC § 15.17.050(C)(4)(d)(15)
- Dedicated permit for tanks
- None specified in the chapter
- Applies to
- Covered new/rehab landscape projects
Summary
Petaluma does not restrict rainwater harvesting, it builds it into the landscape rules. Section 15.17.070(D) exempts water drawn from a properly authorized rainwater catchment system from the city's water waste prohibitions, and Section 15.17.050 requires landscape design plans to identify any rain harvesting or catchment technology used on the project.
(15) Identify any applicable rain harvesting or catchment technologies. ... ... D. Exempt Water Uses. All water use associated with the operation and maintenance of fire suppression equipment or employed by the city for water quality flushing and sanitation purposes shall be exempt from the provisions of this section. Use of water supplied by a private well or from properly authorized recycled water, gray water, or rainwater catchment system is also exempt.
Official source re-checked September 8, 2026: no newer edition of the code had been published (publisher’s edition: current through Ordinance 2931 NCS, passed July 6, 2026).
Full Breakdown
070(D) carves out water supplied by a private well, properly authorized recycled water, gray water, or a rainwater catchment system as exempt from the section's restrictions entirely, alongside water used for fire suppression and the city's own water quality flushing. 070. 050(C)(4)(d) requires any landscape design plan submitted as part of a covered new-construction or rehabilitation project to identify any applicable rain harvesting or catchment technologies, alongside other water-supply features like recycled water areas and graywater discharge piping, so the city's review captures the system at the permitting stage rather than after installation.
The landscape documentation package that triggers this requirement applies to new projects with five hundred square feet or more of landscape area and rehabilitation projects reaching two thousand five hundred square feet within a twelve-month period. Petaluma does not set a minimum tank size, require a separate rainwater harvesting permit, or cap how much collected water a property can use, leaving the practice largely self-regulating once it is disclosed on the landscape plan.
Violations & Fines
There is no penalty specific to rainwater harvesting itself; the only exposure is failing to disclose a catchment system on a required landscape design plan under Section 15.17.050, which the city can treat as an incomplete application and use to withhold approval of the certificate of completion for the covered project.
Frequently Asked Questions
Do I need a permit to collect rainwater in Petaluma?
Does using rainwater on my landscape get me around the watering restrictions?
Can I use harvested rainwater on a commercial or multifamily property?
Sources & Official References
Other rules in Petaluma
California rules heatmap·Compare Petaluma to another location·View the California landscaping rules overview
See something wrong?
Help us keep this page accurate. If you notice an error or outdated information, let us know.
Rainwater Harvesting in Nearby Cities
How other cities in Sonoma County handle rainwater harvesting.