Septic system requirements in Monterey County, California
The septic rules landplan.io applies in Monterey County, what a septic tank costs there, and the parcel data we hold.
Updated
Design a septic system for an address in Monterey County
California's state rules apply in Monterey County: landplan.io has no county rules of its own here. State rules: Reviewed See California's rules
Septic systems allowed in Monterey County
The system types landplan.io permits in Monterey County:
- Drip Distribution System
- Leach Line System
- Horizontal Seepage Pit System
- Vertical Seepage Pit System
- Mounded Leaching System
- Infiltrator Advanced Treatment Leachfield (ATL)
- Infiltrator Advanced Enviro-Septic® (AES)
Septic tank size in Monterey County
The daily design flow of a home: 150 gal/day per bedroom, at least 150 gal/day. The septic tank is sized from that flow:
| Daily design flow | Minimum tank |
|---|---|
| up to 240 gal/day | 1,000 gallons |
| 240 to 360 gal/day | 1,500 gallons |
| 360 to 600 gal/day | 2,000 gallons |
| 600 to 720 gal/day | 2,500 gallons |
| 720 to 840 gal/day | 2,750 gallons |
| 840 to 920 gal/day | 3,000 gallons |
| 920 to 1,040 gal/day | 3,250 gallons |
Septic setbacks in Monterey County
| From | To | Distance |
|---|---|---|
| Polygon | Existing Septic Component to be Abandoned | 5 ft |
These are the values the landplan.io design engine applies in Monterey County. Confirm a design with the California health department or your county's before you build.
Parcel data in Monterey County
landplan.io has parcel boundaries for Monterey County (100% of its area): type an address and the design starts from the parcel.
Septic companies, designers and jobs in California
- Septic companies and distributors in California
- Septic designers in California
- Septic design jobs in California
Where the rules come from
The regulations and documents landplan.io's Monterey County, California rules are read from:
- Water Quality Control Policy for Siting, Design, Operation, and Maintenance of Onsite Wastewater Treatment Systems (OWTS Policy) (State Water Board Resolution No. 2012-0032 (OWTS Policy), codified references at 23 CCR §2, Div. 3, Ch. 15.5)
- 2025 California Plumbing Code, Appendix H - Private Sewage Disposal Systems (with Sections 713.0-721.0 of Chapter 7) (Cal. Code Regs. Title 24, Part 5 (2025 California Plumbing Code), Appendix H, Sections H 101.0-H 1201.0; Tables H 101...)
Near Monterey County
- San Benito County
- Santa Cruz County
- Santa Clara County
- Merced County
- San Luis Obispo County
- Kings County
- Stanislaus County
- Fresno County
- All of California
Questions
What septic systems are allowed in Monterey County?
landplan.io designs by California's state rules there and permits: Drip Distribution System, Leach Line System, Horizontal Seepage Pit System, Vertical Seepage Pit System, Mounded Leaching System, Infiltrator Advanced Treatment Leachfield (ATL) and Infiltrator Advanced Enviro-Septic® (AES).
What size septic tank do I need in Monterey County?
landplan.io sizes the septic tank in Monterey County from the daily design flow: up to 240 gal/day: 1,000 gallons; 240 to 360 gal/day: 1,500 gallons; 360 to 600 gal/day: 2,000 gallons; larger flows need larger tanks. A home's design flow is 150 gal/day per bedroom, at least 150 gal/day.
Does landplan.io have parcel data for Monterey County, California?
Yes: parcel boundaries cover Monterey County (100% of its area).