Rainwater Harvesting: Fremont vs Hayward
How do rainwater harvesting rules compare between Fremont, CA and Hayward, CA?
Fremont and Hayward have similar restriction levels.
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 →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 | Fremont | Hayward |
|---|---|---|
| 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 | EBMUD WaterSmart |
| No permit | - | Under 5,000 gal, outdoor use |
| Over 5,000 gal | - | Plumbing permit |
| Screen | - | 1/16 inch required |
| Overflow | - | To pervious area |
Highlighted rows indicate differences between cities.
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.
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.
Compare other topics
See how Fremont and Hayward 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