Rainwater Harvesting: Fillmore vs Simi Valley
How do rainwater harvesting rules compare between Fillmore, CA and Simi Valley, CA?
Fillmore and Simi Valley have similar restriction levels.
Fillmore, CA
Ventura County
California law fully supports residential rainwater harvesting. Fillmore residents can collect rainwater from rooftops without a permit for landscape irrigation. Rain barrels and cisterns are encouraged as part of water conservation efforts in the Santa Clara River watershed.
View full Fillmore rules →Simi Valley, CA
Ventura County
Rainwater harvesting is legal and encouraged in unincorporated Ventura County under California Water Code Section 10574. No permit is required for residential rain barrels, and the county's watershed protection programs support stormwater capture.
View full Simi Valley rules →Key Facts Comparison
| Fact | Fillmore | Simi Valley |
|---|---|---|
| Legal Status | Fully legal in California | - |
| Permit | Not required for standard rain barrels | - |
| State Law | Water Code §10574 / AB 1750 | - |
| Large Systems | Permit may be needed > 5,000 gal | Building permit for >5,000 gallons |
| Use | Irrigation only (non-potable) | - |
| Permit Required | - | No for standard rain barrels |
| Legal Authority | - | CA Water Code Section 10574 |
| Mosquito Prevention | - | Covered/screened containers required |
| Watershed District | - | (805) 654-2001 |
Highlighted rows indicate differences between cities.
Fillmore FAQ
Can I collect rainwater in Fillmore?
Yes. California law explicitly allows rainwater harvesting. You can install rain barrels and cisterns for rooftop runoff collection without a permit for standard residential systems.
Do I need a permit for a rain barrel in Fillmore?
No permit is needed for standard rain barrels. Large cistern systems over 5,000 gallons may need a building permit for structural support. All systems should prevent mosquito breeding with covered or screened openings.
Can I use collected rainwater for drinking in Fillmore?
Collected rainwater should only be used for outdoor irrigation without treatment. Using it for indoor potable purposes requires treatment systems meeting state health standards and may require permitting.
Simi Valley FAQ
Is rainwater harvesting legal in Ventura County?
Yes. California Water Code Section 10574 explicitly authorizes collecting rainwater from rooftop surfaces. No permit is needed for standard residential rain barrels in unincorporated Ventura County.
Do I need a permit for a rain barrel?
Standard residential rain barrels do not require permits. Larger cistern systems exceeding 5,000 gallons may require a building permit to ensure structural safety and proper installation.
What can I use collected rainwater for?
Captured rainwater may be used for landscape irrigation, garden watering, car washing, and other non-potable outdoor uses. Using rainwater for indoor potable purposes requires treatment systems and health department approval.
Compare other topics
See how Fillmore and Simi Valley 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