As-Is Sales With Septic Systems in Rural Areas

You can sell a rural Southern California house on a septic system as-is: the system is priced as it exists, and the buyer takes on any repair or upgrade. What as-is does not change is the seller's duty to disclose, and what it cannot change is the county's rules, which depend on where the parcel sits. In Los Angeles County, the Department of Public Health reviews septic systems under its Local Agency Management Program in unincorporated areas and the cities that have signed on; in San Bernardino County, Environmental Health Services works under its own program, and in the county's designated maintenance areas a new owner must apply for a septic permit after a change of ownership.

This guide covers who regulates a septic system in those two counties, what the county pages say about existing systems, what to gather before a walkthrough, and when repairing or documenting the system first and listing nets more. It describes the rules as the county pages state them; your county environmental health office, the escrow officer and, for disclosure questions, a real estate attorney apply them to your parcel.

Who regulates a septic system here

Septic systems are called onsite wastewater treatment systems, or OWTS, in the rules. Both county pages trace their programs to the State Water Board's OWTS Policy. San Bernardino County's page says the policy was first adopted in June 2012, became effective May 13, 2013, and was most recently updated on April 18, 2023. Los Angeles County's page describes it as a multi-tiered strategy for managing septic systems in California. Under that policy, both counties run a Local Agency Management Program, or LAMP, approved by a Regional Water Quality Control Board, and that program is where the local rules for your system live.

The other four counties we work in, Orange, Riverside, San Diego and Ventura, each run their own environmental health program. This article quotes only the two county programs whose pages were read for it, so check your own county's page if the house is elsewhere.

Los Angeles County

The county Board of Supervisors adopted its LAMP and ordinance on October 2, 2018, and from November 1, 2018 the Department of Public Health has reviewed and approved septic systems under it for residents of unincorporated county areas and contracted cities. The county's list of cities covered under the LAMP includes Glendora and La Verne, foothill cities near our Claremont base, along with Lancaster, Palmdale, Santa Clarita, Rancho Palos Verdes and others. The county's Onsite Wastewater Treatment Program reviews system designs, required covenants and historical records and inspects installations before final approval.

Four points from the county's materials matter most to a seller:

• Evaluations follow projects, not sales. The county's guide to its System Evaluation Form says an evaluation is required for existing systems in service more than 15 years, and for systems without evidence of prior approval, when the owner proposes a septic tank replacement, an addition or a home expansion. A licensed contractor (Class A, C-36 or C-42) completes it, and the county uses it to decide whether the system needs an upgrade or a new installation. The county materials read for this article do not describe an evaluation triggered by a sale itself.
• Bedrooms are counted broadly. For the evaluation, the guide treats as a bedroom or bedroom equivalent any room that could be used as one, including dens, studios, offices and lofts, and any room of 70 square feet or more. A converted garage or an enclosed patio that works as a bedroom can change what the system has to serve. Unpermitted space has its own page: unpermitted additions.
• Nearby sewer changes the future. The guide says that where public sewer is available within 200 feet of the building, a septic approval will not be issued, and the property must connect to the sewer when the current system fails or needs an upgrade.
• Cesspools are their own category. The county's page says new cesspools are prohibited in California, and its evaluation form says the Regional Water Boards allow continued use of a cesspool at a single-family house until it fails, contaminates water, or the house adds a bedroom or bedroom equivalent.

The guide also defines a failing system, citing the county code: sewage backing up into the house from a tank or dispersal malfunction, sewage or effluent reaching the ground surface, or a system that needs pumping more than twice in six months to keep working, among other signs. Records for a specific property or system come through the Department of Public Health's Custodian of Records, and prior approvals in unincorporated areas can be looked up through the county's GIS-NET viewer or, in other cities, the local building department.

San Bernardino County

San Bernardino County's LAMP was approved in 2017 by the Board of Supervisors and the Regional Water Quality Control Board and took effect in the county on May 13, 2018. The county requires a home builder to connect to an available sewer or, where none is available, to build a septic system. Environmental Health Services reviews percolation test reports, researches archival data to establish the percolation rates assigned to parcels in the past, consults with owners on their options, and responds to complaints of failing systems.

Three county rules reach a sale directly:

• Designated maintenance areas. These are areas without public sewer that the Regional Water Board has found sensitive to septic contamination. Owners keep their systems on condition of a county inspection every other year, and on a change of ownership the new owner must apply for the permit. The county's application lists the communities: Angelus Oaks, Big Bear, Forest Falls, Lakeview, Metcalf Creek, Mountain Home Village, Pine Knot, Polique Canyon and Willow Glen. It asks for a recent private sewage disposal verification letter.
• Alternative treatment systems. These carry an operating permit, and the change-of-ownership application asks for the recorded Notice of Condition, a recent system certification, the service contract and the last maintenance report.
• Sewage holding tanks. These need an annual operating permit and an annual county inspection.

If the house is in one of those places, the buyer will need those papers, and having them before the walkthrough keeps the escrow from waiting on them.

Older rural lots in Chino

In Chino, some older rural lots from the farming era remain, where back houses and added rooms are common, and escrow already checks whether dairy-era easements or agricultural covenants still run with an older parcel. Whether a particular lot is on the public sewer or a private system is a records question for the City of Chino and the county, not something to assume from the age of the house.

What changes when the sale is as-is

The system is priced as it exists. If the walkthrough, a pumping report or the buyer's own inspection shows that the tank, the leach field or a seepage pit needs work, that work becomes a line on the offer rather than a repair you fund. Three things stay the same:

1. Disclosure. Civil Code section 1102 applies California's transfer disclosure rules to sales of single-family residential property and says any waiver of them is void as against public policy. What you know about the system, including backups, pumping history and repairs, belongs in the disclosures. See the Transfer Disclosure Statement for as-is sellers.
2. The buyer's inspection rights. A buyer who wants a septic inspection makes it a term of the contract. As-is does not stop it.
3. The lender, if there is one. A financed buyer's appraiser rates the condition of the whole house, and a deficiency affecting safety or soundness can stall the loan; see as-is and appraisals: when lenders balk.

What to gather before the walkthrough

• Where the tank is. San Bernardino County's homeowner flyer says the top of a tank is usually two to four feet below the surface, that tanks cannot legally sit closer than five feet from the house, and that the tank is typically in the front yard but can be in the rear yard or under a patio slab.
• Pumping and service receipts, and any inspection or evaluation report.
• The original approval and any later permits, from the county records described above.
• Any operating permit, maintenance-area permit or recorded Notice of Condition.
• A note of rooms added since the system was approved.

None of it is required for an as-is offer. Each item it answers is one the offer does not have to price as unknown.

When documenting or repairing first nets more

• The system works, has its approvals on record and a recent clean pumping or inspection report, so a buyer has nothing to price as a risk.
• The house would otherwise finance, and the rural lot or the view would draw owner-occupant buyers who are glad to take on a working system.
• A specific, limited septic repair would remove the one item turning buyers away, and you have the time to do it.

When the open-market column on the written report comes out higher and the timing works, the recommendation says so, and you are introduced to a designated local expert, an independently licensed California agent who works your area. Mr. Cali Offers never lists a house. When the system's condition or history is unknown, the cash column prices it in writing so you can compare. The as-is pillar covers what the buyer takes on.

What this looks like in practice

These are the kinds of files that come in, described without names or figures.

• Heirs to a foothill house on a septic system with no pumping records, who wanted to know what the unknown costs them as-is.
• An owner of a mountain cabin in a designated maintenance area, selling from out of the area, who needed the permit papers lined up for the buyer.
• A seller whose rural house gained a room over the years and wanted to know what that meant for the system before listing.

The as-is sales hub has the rest of this series.

Next step

If your house is on a septic system, get both numbers on it as it is or call (909) 498-3977. There is no cost and no obligation to get the two numbers and the written report.

Sources

• Los Angeles County Department of Public Health, Onsite Wastewater Treatment System (program, LAMP cities, cesspools, records): publichealth.lacounty.gov (accessed November 6, 2026)
• Los Angeles County Department of Public Health, Local Agency Management Program (LAMP adoption, State OWTS Policy background): publichealth.lacounty.gov (accessed November 6, 2026)
• Los Angeles County Department of Public Health, Guide for Completing a System Evaluation Form for Existing Onsite Wastewater Treatment Systems: publichealth.lacounty.gov (accessed November 6, 2026)
• Los Angeles County Department of Public Health, System Evaluation Form for Existing Onsite Wastewater Treatment Systems (cesspool use): publichealth.lacounty.gov (accessed November 6, 2026)
• San Bernardino County Environmental Health Services, Wastewater and Land Use (OWTS Policy dates, LAMP, designated maintenance areas, holding tanks): ehs.sbcounty.gov (accessed November 6, 2026)
• San Bernardino County Environmental Health Services, OWTS Operational Permit Application / Change of Ownership: ehs.sbcounty.gov (accessed November 6, 2026)
• San Bernardino County Environmental Health Services, Designated Maintenance Areas Facts: ehs.sbcounty.gov (accessed November 6, 2026)
• San Bernardino County Environmental Health Services, Where Is My Septic System?: ehs.sbcounty.gov (accessed November 6, 2026)
• California Civil Code section 1102 (transfers the disclosure article covers; waivers void as against public policy), copy read on california.public.law, accessed November 6, 2026

Mr. Cali Offers is not a law firm, an inspector or a septic contractor. Cash offers come from independent buyers and investors who buy for their own account and may resell for profit; a cash offer is generally below what the open market would bring. Any value shown is a preliminary estimate, not an appraisal. Nothing here is legal, tax or financial advice.