Rohnert Park, CA Landscaping Rules: Rainwater Harvesting (2026)
Key Facts
- Permit needed
- None, listed as permitted use (P)
- Max height
- 20 feet, never taller than the building
- Placement
- Within 10 feet of a building
- Engineering review
- Required for slab support and seismic safety
- Zones covered
- SVPD T3-T6, CS, CP, CB (not T7)
Summary
Within the Sonoma Mountain Village Planned Development, Rohnert Park's zoning table permits rooftop rainwater cisterns by right across the T3 through CB transect zones. The zoning glossary caps a Water Cistern's height at twenty feet, requires it to sit within ten feet of a building, and requires engineering sign-off on seismic and structural support.
T3 T4 T5 T6 CS CP CB T7 Additional Use Regulations ... Water Storage Cisterns P P P P P P P ... "Water Cistern." A container storing rainwater collected from a building's roof or containing fully treated greywater. A Water Cistern must be placed within ten feet of a building. It may be up to twenty feet tall, but in no case may it exceed the height of the adjacent building. Structural support for the slab it sits on and to ensure seismic safety will be reviewed and approved by engineering on a case-by-case basis.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 51 Update 2).
Full Breakdown
A. 840, the SVPD's land use table, lists 'Water Storage Cisterns' as a 'P,' permitted-by-right, use across the T3, T4, T5, T6, CS, CP and CB zoning designations, meaning no conditional use permit or administrative permit is required to install one in those areas. ' Because the definition allows a cistern to store either roof-collected rainwater or fully treated greywater, the same structure can serve both purposes under this section. This run did not find an equivalent numeric height or setback standard for rainwater cisterns written into the general, citywide Title 17 zoning chapters that govern parcels outside the SVPD's mapped transect zones, so property owners elsewhere in Rohnert Park should confirm current standards with the Development Services Department before installing a large above-ground cistern.
Violations & Fines
Installing a Water Cistern taller than twenty feet, taller than the adjacent building, farther than ten feet from a building, or without the required engineering review of its slab and seismic support violates Section 17.06.840's SVPD standards. A violation falls under the citywide general penalty, Section 1.16.010: an infraction starting at $100 for a first offense, rising to $500 for a third violation within a year, or a misdemeanor with up to a $1,000 fine and six months in jail for more serious cases.
Frequently Asked Questions
Can I install a rain-collection cistern in Rohnert Park without a permit?
How tall can a rainwater cistern be?
Does this rule apply outside the Sonoma Mountain Village area?
Sources & Official References
Other rules in Rohnert Park
California rules heatmap·Compare Rohnert Park to another location·View the California landscaping rules overview
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Rainwater Harvesting in Nearby Cities
How other cities in Sonoma County handle rainwater harvesting.