Rainwater Harvesting: Berkeley vs Hayward
How do rainwater harvesting rules compare between Berkeley, CA and Hayward, CA?
Berkeley and Hayward have similar restriction levels.
Berkeley, CA
Alameda County
Rain barrels under 5,000 gallons are allowed without permit in Berkeley. Larger cisterns and any potable connection require plumbing permits and state code compliance.
View full Berkeley rules →Hayward, CA
Alameda County
Rainwater harvesting is encouraged. Rain barrels up to 5,000 gallons are permit-exempt under California Rainwater Capture Act.
View full Hayward rules →Key Facts Comparison
| Fact | Berkeley | Hayward |
|---|---|---|
| Rain barrels | Under 5,000 gal - no permit | - |
| Larger cisterns | Plumbing permit required | - |
| Use | Outdoor/non-potable | - |
| EBMUD rebate | 35 dollars/barrel | - |
| Mosquito screens | Required | - |
| No permit | - | Under 5,000 gal, outdoor use |
| Over 5,000 gal | - | Plumbing permit |
| Screen | - | 1/16 inch required |
| Rebates | - | EBMUD WaterSmart |
| Overflow | - | To pervious area |
Highlighted rows indicate differences between cities.
Berkeley FAQ
Can I connect rainwater to my toilet?
Yes, with a Berkeley plumbing permit and an approved treatment/backflow system per CPC Chapter 17. Purple-pipe labeling and dual plumbing are required to prevent cross-connection with potable supply.
Do I need to screen my rain barrel?
Yes. Alameda County Mosquito Abatement requires 1/16-inch mesh screens on all open water containers. Unscreened barrels can be cited as a public health nuisance.
Hayward FAQ
Can I use rainwater inside my home?
Only with a permitted plumbing system that meets California Plumbing Code Chapter 17 treatment standards.
How big can my rain barrel be?
Up to 5,000 gallons without a permit for gravity-fed outdoor irrigation.
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