Rainwater Harvesting: Berkeley vs Fremont
How do rainwater harvesting rules compare between Berkeley, CA and Fremont, CA?
Berkeley and Fremont 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 →Fremont, CA
Alameda County
Fremont allows rainwater barrels and cisterns for landscape irrigation. Barrels up to 5,000 gallons do not need a permit. ACWD offers rebates for qualifying systems.
View full Fremont rules →Key Facts Comparison
| Fact | Berkeley | Fremont |
|---|---|---|
| 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 | - |
| Permit-Free Capacity | - | Up to 5,000 gallons |
| Use Allowed | - | Landscape irrigation |
| Screen Required | - | Mosquito mesh |
| Indoor Use | - | Permit plus treatment |
| Rebates | - | ACWD Bay Save program |
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.
Fremont FAQ
Can I use rainwater for my vegetable garden?
Yes. California permits rainwater from rooftops for irrigation of edible gardens. Avoid watering leafy greens directly from an uncovered barrel, and let the water soak into the soil rather than spraying directly on produce.
Do I need to do anything for mosquitoes?
Yes. All barrels and cisterns must be covered with 1/16 inch or finer screen to prevent mosquito breeding. Alameda County Mosquito Abatement can inspect and require corrections under state public health law.
Compare other topics
See how Berkeley and Fremont compare on other ordinance categories.
Want to add a third city?
Use our full comparison tool to compare up to three cities.
Open Comparison Tool