California Septic Feasibility Directory

Research septic feasibility, perc tests, soils, groundwater, reserve area, setbacks, and Environmental Health questions.

Why septic feasibility matters

Septic can make or break rural, edge, and unincorporated projects. It is more than a perc test and can depend on soil, groundwater, slope, reserve area, setbacks, and environmental constraints.

No automatic parcel-level answer

California utility service is fragmented across cities, counties, utility providers, sanitation districts, water districts, environmental health agencies, special districts, and private infrastructure. Use this page as a research starting point only.

How to research this utility

Confirm whether public sewer is unavailable or impractical.
Ask Environmental Health about records, perc testing, soils, reserve area, setbacks, and system options.
Ask whether connection, capacity, fees, easements, trenching, or extensions apply.
Request written confirmation where possible.

Evidence worth collecting

Collect existing septic permits and as-built drawings, bedroom design capacity, maintenance or inspection records, soil and percolation reports, groundwater information, reserve-area evidence, and Environmental Health correspondence. Map the system and required setbacks before placing a new structure.

Keep these costs separate

Separate records research, site evaluation, soils or perc testing, engineering, Environmental Health review, installation, reserve-area protection, pumping, abandonment, and future maintenance.

Decision checkpoint before design

Do not treat this utility as resolved until the serving agency or qualified professional has been identified, the parcel has been matched to the relevant record or service boundary, and the likely connection or on-site system path has been described. Record what remains conditional, what study or application comes next, how long that step may affect the project sequence, and which design assumption depends on the answer. Carry a contingency for conditions that cannot be confirmed before excavation, engineering, or formal review.

Septic Feasibility red flags

No septic records
Steep slope
High groundwater
Small lot
Shallow rock
Reserve area unclear

Questions to ask

Are septic records available?
Is a perc test or soil report needed?
Where can leach field and reserve area go?
Does an ADU change wastewater review?