Fillmore · Ventura County · California

Septic in Fillmore, CA

Fillmore is in Ventura County, and that page sets out the county's septic rules for any address that isn't on public sewer. California lets a city, a county or a special district act as the local agency for septic systems, so if you're unsure who issues your permit, ask the city first and the county second.

Residents: 16,665
Homes built before 1980: 59.7%
Median home value: $567,500

The resident, housing-age and home-value figures come from the Census Bureau's ACS 2023 five-year estimates (B01003, B25034, B25077).

Written by SepticMatch's editorial teamLast reviewed Oct 23, 2026

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Ventura County sets the septic rules

The city doesn't issue septic permits or set the sale-inspection and installer rules, because the county health department handles all three. Hooking an ADU to an existing septic system needs a $1,171 Full Certification..

Who permits septic systems: Ventura County Resource Management Agency, Environmental Health Division, Liquid Waste Program, 800 S Victoria Ave, Ventura; (805) 654-2494. The program covers unincorporated Ventura County; cities are not covered. Pumper inspection hotline 805/477-7136.
Inspection at sale: Not confirmed
Permit steps: Soils reports by a California registered engineer, geologist or REHS, with percolation test data, IAPMO-listed tanks, a 100% expansion area, and a slope stability study if dispersal is on a slope over 30%. A conventional Permit to Construct covers up to three inspections, an alternate up to four. New or replacement systems must connect to sewer if within 200 ft (VCBC 713.4). Connecting an ADU or JADU to an existing system needs a Full Certification and at least 1,000 gallons of tank per dwelling unit.

See the Ventura County septic rules

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