Alameda, CA Landscaping Rules: Rainwater Harvesting (2026)
Key Facts
- Exemption trigger
- Under 2,500 sq ft landscape, 100% rain/graywater supplied
- Reduced requirement
- Appendix B condition (4) only
- Full package threshold
- 500 sq ft new or 2,500 sq ft renovated landscape
- State overlay
- Cal. Code Regs. Title 23, Div. 2, Ch. 2.7 MWELO
- Reviewing department
- Community Development Department
Summary
Alameda's landscape ordinance rewards on-site rainwater harvesting: a lot under 2,500 square feet of landscape that meets its entire estimated landscape water demand with stored rainwater or graywater is excused from the full MWELO documentation package and need only satisfy Appendix B condition (4) of the City's Landscape Document Package Checklist under Section 30-58.4(e).
e.For projects using treated or untreated graywater or rainwater captured on site, any lot or parcel within the project that has less than two thousand five hundred (2,500) square feet of landscape and meets the lot or parcel's landscape water requirement (estimated total water use) entirely with treated or untreated graywater or through stored rainwater captured on site is subject only to Appendix B condition (4) of the most recently adopted Landscape Document Package Checklist.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 74).
Full Breakdown
4(e) of the Bay-Friendly and Water Efficient Landscape Ordinance gives Alameda property owners a direct incentive to capture rainwater on site. 4(b). Instead, that parcel need only satisfy Appendix B condition (4) of the City's Landscape Document Package Checklist, on file with the Community Development Department. 3(c), so this exemption targets smaller lots that go entirely off potable water for irrigation through rain catchment or graywater reuse rather than large subdivisions. 2, so a qualifying rainwater or graywater system still has to be sized consistent with the state standard even while the parcel skips the full local documentation package.
Violations & Fines
A parcel claiming the graywater or rainwater exemption still needs Community Development Department sign-off that it satisfies Appendix B condition (4) of the Landscape Document Package Checklist; if the stored rainwater or graywater system cannot actually cover the parcel's full estimated landscape water use, the project reverts to the standard Landscape Documentation Package requirement under Section 30-58.4(b) before a building permit or Certificate of Completion is issued.
Frequently Asked Questions
Do I need a full landscape plan if I irrigate entirely with rainwater?
Does this exemption apply to a whole subdivision?
What is Appendix B condition (4)?
Sources & Official References
Other rules in Alameda
California rules heatmap·Compare Alameda to another location·View the California landscaping rules overview
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Rainwater Harvesting in Nearby Cities
How other cities in Alameda County handle rainwater harvesting.