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🌿 Landscaping Rules/Rainwater Harvesting

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

Few Restrictions

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 β†’

Hayward, CA

Alameda County

Few Restrictions

Rainwater harvesting is encouraged. Rain barrels up to 5,000 gallons are permit-exempt under California Rainwater Capture Act.

View full Hayward rules β†’

Key Facts Comparison

FactFremontHayward
Permit-Free CapacityUp to 5,000 gallons-
Use AllowedLandscape irrigation-
Screen RequiredMosquito mesh-
Indoor UsePermit plus treatment-
RebatesACWD Bay Save programEBMUD 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.

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