Homes for Sale in Santa Susana Knolls, Simi Valley
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Santa Susana Knolls at a glance
- The whole outline sits on County land: Santa Susana Knolls homes for sale here fall inside a map outline of about 280 acres around Katherine Road, Birch Street and Oak Knolls Road. Census geocoder checks across it return the unincorporated Santa Susana census-designated place, not the City.
- Rural Exclusive zoning, several lot sizes: Public filings show Rural Exclusive (RE) zones with different minimum lots: RE-10,000 at a water district site on Crown Hill Drive in 2025, and RE-20,000, RE-1ac and RE-5ac on land near Katherine Road in a 2012 County report. Confirm the parcel’s current zone.
- Two water suppliers in the area: A 2025 draft study by Ventura County Waterworks District No. 8, governed by the Simi Valley City Council, says two Alta Vista Tanks holding about 250,000 gallons feed its Knolls Pressure Zone, and proposes a one-million-gallon Crown Hill Tank to improve storage and pressure for some higher lots. Golden State Water also serves the region, so confirm the supplier.
- Septic is a County file: If the home has a septic system, County Environmental Health is the authority for those systems in unincorporated Ventura County and posts imaged records online. Its staff do not assess systems for real estate transfers, so hire a private inspector.
Roads and fire, parcel by parcel
County Public Works maintains only roads the Board of Supervisors has accepted; private roads and unaccepted public roads fall outside its jurisdiction. Check each street to the house on the County-maintained roads list, and ask who repairs any that are missing.
The 2025 draft study rates its tank site Very High on CAL FIRE’s hazard maps, but lots can rate differently, so check the property itself. Ventura County Fire rules in effect since March 1, 2025, and as of 2026, call for a five-foot noncombustible Zone 0 around new buildings and additions, which shapes expansion plans.
Santa Susana Knolls questions, answered
Do City of Simi Valley rules apply in the Knolls?
Not on County parcels. The City’s planning FAQ sends owners of property outside the red line on its Zoning Map to the County’s Resource Management Agency. Compare 93063 homes for sale or all Simi Valley homes for sale.
What is the Santa Susana Field Laboratory?
The state Department of Toxic Substances Control describes it as a roughly 2,850-acre site in Ventura County where rocket engine testing and nuclear research took place, now undergoing environmental cleanup with DTSC as the lead regulatory agency. DTSC’s SSFL pages hold a FAQ, a document library and an email sign-up.
Who can line up these checks?
A Simi Valley real estate agent can assemble the road, septic and fire zone records early in escrow.