California Sewer Availability Directory
Research sewer providers, service areas, sewer GIS maps, connection questions, fees, laterals, and sewer-vs-septic feasibility.
Why sewer availability matters
If public sewer is part of the project path, an ADU or dwelling may be more straightforward than a parcel that needs septic. If sewer is not part of the path, septic feasibility becomes critical.
No instant 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
- Identify the APN and address.
- Confirm city versus unincorporated county jurisdiction.
- Identify the provider or agency that controls this utility.
- Check service boundary, GIS, permit, or provider resources where available.
- Ask whether connection, capacity, fees, easements, trenching, or extensions apply.
- Request written confirmation where possible.
Sewer vs septic
| Factor | Option A | Option B |
|---|---|---|
| Cost predictability | Often clearer after provider confirmation | Depends on soil, design, environmental health, and site layout |
| Land area needed | Usually less private disposal area | Needs leach field, reserve area, setbacks, and suitable soils |
| Maintenance | Provider system plus owner lateral obligations | Owner maintains system and protects reserve area |
| Rural feasibility | May be unavailable outside service districts | Often central to rural feasibility |
| ADU impact | May trigger capacity or connection fees | May require system sizing or expansion review |
Sewer Availability red flags
- No sewer main nearby
- Outside service district
- Line extension required
- Capacity or fee uncertainty
- Easement or pump system needed
Questions to ask
- Is sewer service available to this APN or address?
- Is the parcel inside the sewer service boundary?
- Is a main near the property?
- Are connection, capacity, lateral, or extension fees expected?
Start by location
city
Los Angeles
Provider may vary by parcel, especially near city edges or special districts.
city
San Diego
Provider may vary by parcel, especially near city edges or special districts.
city
Riverside
Provider may vary by parcel, especially near city edges or special districts.
county
Orange County
Confirm whether the parcel is inside a city or unincorporated county territory first.
county
San Bernardino County
Confirm whether the parcel is inside a city or unincorporated county territory first.
county
Ventura County
Confirm whether the parcel is inside a city or unincorporated county territory first.
city
Sacramento
Provider may vary by parcel, especially near city edges or special districts.
city
Fresno
Provider may vary by parcel, especially near city edges or special districts.
county
Kern County
Confirm whether the parcel is inside a city or unincorporated county territory first.
county
San Joaquin County
Confirm whether the parcel is inside a city or unincorporated county territory first.
Related guides
TinyHomeNavigator provides educational information only. Rules vary by parcel, zoning district, city, county, overlay, utility provider, fire authority, and environmental health department. Always confirm directly with the local planning department, building department, environmental health department, fire authority, and utility providers before buying land, designing, permitting, placing, or building any structure.