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San Diego County · California · Southern California Coast

Septic in San Diego County, CA

What to watch for here: San Diego County's septic program has run under a new LAMP since February 1, 2025..

Residents
3,298,634
Rank by population
2 of 83
Sale inspection
No rule found in the county's published code

Population comes from the U.S. Census, and the rules and fees were checked Oct 20, 2026. How we check.

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

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Septic rules in San Diego County

San Diego County's Department of Environmental Health and Quality handles septic work through its Land Use Program, with a counter for onsite systems at 5500 Overland Ave, Suite 110. Questions go to the Duty Desk at (858) 565-5173. The Septic Inspection Line is a separate number, (858) 694-2553. A new Local Agency Management Program took effect on February 1, 2025, and the permit forms were replaced that day too. The San Diego Regional Water Board approved it with Resolution R9-2024-0130 on Nov 13, 2024, replacing a program first approved in 2015.

Among the forms you'll meet are the OWTS layout report, the percolation test permit application (the perc test measures how fast the soil absorbs water), the septic installation permit application and the septic repair authorization. For a supplemental treatment system, which cleans the wastewater further before it reaches the soil, the county wants percolation testing and a design by an OWTS Professional holding a license, and the system needs an Annual Operating Permit.

Ground steeper than 25% also calls for a slope stability report or statement from a civil engineer or geologist holding a license. What you pay follows the fee schedule for the fiscal year the work happens in, and a job that runs into the next fiscal year is re-invoiced at current rates. The county's septic page doesn't describe an inspection at sale, and the state policy sets none statewide, so ask the Duty Desk before closing. Pumping soon? The Department of Public Works runs a Septic Pumping Rebate Program.

The county's rules, line by line

Who permits septic systems
County of San Diego Department of Environmental Health and Quality (DEHQ), Land and Water Quality Division, Land Use Program; onsite systems counter at 5500 Overland Ave, Suite 110; Duty Desk (858) 565-5173; Septic Inspection Line (858) 694-2553.
Inspection at sale
No rule found in the county's published code. The county's septic page describes no inspection at sale or transfer, and the state OWTS Policy sets no statewide point-of-sale septic inspection.
Permit steps
Forms (new or updated effective Feb 1, 2025): OWTS Layout Report, Percolation Test Permit Application, Percolation Test Results, Septic Repair Authorization, Septic Installation Permit Application, Covenant Agreement, OWTS Professional Registration. Supplemental treatment systems need percolation testing and a design from an OWTS Professional holding a license; slopes over 25% need a slope stability report or statement from a civil engineer or geologist holding a license.
Still to confirm with the county
The Final 2025 LAMP took effect February 1, 2025, approved by San Diego Water Board Resolution R9-2024-0130 (Nov 13, 2024). Fees are charged at the schedule for the fiscal year of service and re-invoiced at current rates if work spans fiscal years; no fee amounts were read. Supplemental treatment systems carry an Annual Operating Permit, and DPW runs a Septic Pumping Rebate Program.

Rules and fees change every year, so confirm a line with the health department before you rely on it. "No rule found" means the pages and code we have say nothing on that line, which isn't the same as the county telling you there's no rule. To compare counties, use the county rules lookup.

What septic work costs

These are statewide estimates from our model, so they aren't San Diego County prices; where the county posts its own permit and evaluation fees, they are on this page.

Estimated septic cost ranges
JobEstimated rangeUnit
Septic pumping$325 to $600per visit
Septic inspection$135 to $555per inspection
Drain field$1,200 to $8,150per repair
Septic pumping$325 to $600
per visit
Septic inspection$135 to $555
per inspection
Drain field$1,200 to $8,150
per repair

These are estimates, not quotes. How we estimate costs.

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