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.
California Water Code Section 10574 explicitly authorizes rainwater harvesting from rooftop surfaces for any beneficial use. In unincorporated Ventura County, residents may install rain barrels and cisterns without permits for typical residential systems. Larger systems exceeding 5,000 gallons may require building permits to ensure structural safety. The Ventura County Watershed Protection District promotes rainwater capture as part of its stormwater management program. Rain gardens, bioswales, and permeable paving are additional capture methods encouraged by the county. Captured rainwater may be used for landscape irrigation, garden watering, and non-potable household uses. The county's Mediterranean climate with seasonal rainfall makes storage systems particularly valuable for extending water availability through dry months.
Rainwater harvesting itself does not generate violations. Systems that create standing water breeding mosquitoes may be cited by the Ventura County Environmental Health Division. Unpermitted large cisterns (over 5,000 gallons) may require retroactive permitting. Systems must not direct water onto neighboring properties.
Simi Valley, CA
Simi Valley Municipal Code Chapter 22 establishes noise standards that prohibit excessive noise during nighttime hours in residential zones. The city enforce...
Simi Valley, CA
Simi Valley regulates the use of leaf blowers and similar powered garden equipment through noise ordinance provisions. Gas-powered leaf blowers are subject t...
Simi Valley, CA
Simi Valley requires vehicles to be parked on improved surfaces and prohibits blocking sidewalks, driveways, and fire hydrants. Driveway modifications requir...
Simi Valley, CA
Simi Valley enforces a 72-hour street parking limit for all vehicles on public streets. Additional restrictions apply to specific streets, school zones, and ...
Simi Valley, CA
Simi Valley regulates the parking and storage of recreational vehicles, boats, and trailers on residential properties. Vehicles must be stored in approved lo...
Simi Valley, CA
Simi Valley restricts the parking and storage of commercial vehicles in residential zones. Large commercial vehicles, heavy equipment, and vehicles with comm...
Side-by-side rule comparisons with other cities in Ventura County.
See how other cities in Ventura County handle rainwater harvesting.
See how Simi Valley's rainwater harvesting rules stack up against other locations.
Help us keep this page accurate. If you notice an error or outdated information, let us know.