Many Old Agoura homes have a septic system in the yard, and nothing in a standard sale requires anyone to look at it. California law does not mandate a septic inspection when a home sells. Los Angeles County recommends one, and many lenders require one. Unless a lender asks for one, the only check on the system is the one the buyer orders or the seller arranges ahead of time. The permit history that would explain what is buried out there is kept by a County department, not by the City of Agoura Hills.
On a horse property selling for millions, this one component can go through escrow without anyone looking at it.
How Common Septic Is Here
The Old Agoura Homeowners association noted in a September 30, 2026 post that about 20% of U.S. homes use septic, and that "that percentage is higher for Old Agoura." A septic service company that works in Agoura Hills goes further and says most of Old Agoura has no sewer lines at all, so homes depend on individual tanks and leach lines. That comes from a contractor, not a utility service map. Even so, it matches the neighborhood's rural, equestrian zoning, which the HOA describes as allowing horses and livestock.
In practice, the property you are buying or selling probably treats its own wastewater on site. When a septic system works, nobody notices it. When it stops working, the problem is in the yard.
The Records Live With the County
The City of Agoura Hills issues building permits. Septic is handled elsewhere. The LA County Department of Public Health's Onsite Wastewater Treatment System program reviews and approves system designs, and its current page lists Agoura Hills as a participating city. A 2019 City Council report described how the arrangement works. The County keeps the septic inventory and handles operating permits. The City sends relevant building permit applications to the County and holds those permits until the County approves the plans.
This matters for anyone planning work after closing. A new barn, a guest house or an added bathroom on a septic lot can depend on a County approval. That approval comes before any City sign-off.
Getting the File
DPH sends public record requests for septic systems to its Custodian of Records. The process is simple once you know which office to contact:
- Fill out the DPH California Public Records Act request form and email it to [email protected]. The Department uses this route for requests covering permit applications and "any and all records."
- Include the street address and the APN. Describe the records you want, such as permits, approvals, inspection records and stamped plans or as-builts, and give a time period or ask for the full available history. The form asks for a detailed description and a specific time frame.
- A copy of a single Environmental Health inspection report goes through a separate Environmental Health records form, not the Custodian route.
- Plan for the wait. DPH says the Custodian responds within 10 days, and the County's public records guidance allows up to 14 more days in unusual circumstances.
Copies are cheap. The County's general fee schedule lists three cents per page plus a 75-cent handling fee per order, though departments may charge different rates when their actual costs differ. The cost is low. The time is what you have to plan around.
Why the Calendar Matters More Than the Fee
Local and county market data for summer 2026 show why the records request is a timing problem. No ZIP-level figures for 91301 were published for August or September, so the closest benchmarks are regional.
| Measure | Figure | Period and source |
|---|---|---|
| Median days to contract, eight-market Conejo/Simi/Moorpark area including Agoura Hills | 29 days | July 2026, CSMAR |
| Median sold price per square foot, same area | $518 | July 2026, CSMAR |
| Median time on market, LA County single-family | 30 days | August 2026, C.A.R. |
| Unsold inventory index, LA County | 3.9 months | August 2026, C.A.R. |
In July 2026, homes in the Conejo Valley and nearby markets went to contract in a median of 29 days. A County records request can take 10 days and in some cases as long as 24. A buyer who starts the request after making an offer is waiting on paperwork while the escrow clock runs. A seller who starts it after listing may not have the file before offers come in.
The seller has the advantage here. A permit history pulled before the listing goes live, along with recent pumping and service receipts, answers the buyer's first septic question before it slows the deal. The HOA's September post recommends that homeowners keep inspection, pumping and repair records for exactly this reason.
What an Inspection Covers on a Horse Property
The County's evaluation form for existing systems records the system's history and service, the tank, the dispersal field, and the setbacks to buildings, property lines, pools, wells, trees and watercourses. Corrals and manure storage do not appear on the form. In our research we found no Agoura Hills or Old Agoura rule setting a septic setback from horse facilities. On an equestrian lot, ask your inspector directly where the leach field sits relative to paddocks, arenas and manure areas, and get the answer in writing.
As for cost, one septic contractor that serves Agoura Hills posts residential pumping starting at $500. It also lists inspection tiers of $500 for a visual inspection, $800 for a tank inspection and $1,000 for a full system evaluation. Elsewhere on the same page, the contractor says a standard inspection starts at $400. Treat these as one company's posted prices, not a market survey. Our research did not turn up a reliable local replacement cost, and we would rather leave that number out than guess.
The Sewer Question Has Been Raised Before
Old Agoura buyers sometimes ask whether sewer service is coming. The best public record we found is a February 22, 2021 workshop of the Las Virgenes–Triunfo Joint Powers Authority. Consultants there listed "Chesebro and Old Agoura Septic" as a possible septic-to-sewer conversion, ranked medium priority, alongside Malibu Lake and Monte Nido. The minutes add:
"She responded to a question regarding a legal requirement for homes in these areas to connect to the sewer system by confirming that there was no legal requirement to connect."
The general manager said at the same meeting that over time these systems would eventually be converted as the Regional Water Quality Control Board adopts new septic standards. Another staff member pointed out that the agencies had no control over when such conversions might happen. The minutes say conversions would require new local sewers and possibly extended trunk lines.
The City has the idea on its list as well. Its 2025 General Plan Progress Report, approved by the City Council on March 25, 2026, marks a feasibility study for extending sewer lines into Old Agoura as "In Progress." The study is being coordinated with the Las Virgenes Municipal Water District, LA County Public Works and the Old Agoura Homeowners' Association, and it will be considered during the City's 2026 Sewer System Management Plan update. A feasibility study is not a construction project, and we found no construction schedule or funding. Buyers should assume the septic system they inherit is the one they will maintain.
Chesebro Road Is Under Construction This Month
The septic system is one piece of Old Agoura's infrastructure. The road and trail network is another, and it is being worked on right now. The City of Agoura Hills announced street improvements on Chesebro Road and Colodny Drive starting October 1, 2026, under its FY 25-26 and 26-27 program. Work runs through October and includes asphalt grinding, paving, roadway repairs and utility cover adjustments, from 7:00 a.m. to 4:00 p.m., with roads expected to reopen after 4:00 p.m. each workday. Onyx Paving Company is the contractor, and the City notes the schedule may change with weather or field conditions.
This work follows a July 2025 HOA report. At the time, crews were patching Upper Chesebro between Balkins Drive and Fairview Place and backfilling eroded sections of the equestrian easement on the west side. The Old Agoura Homeowners' Board called these temporary fixes until July 2026, when it expected road surfaces, swales "and hopefully the equestrian pathways" to be fully renovated. We could not confirm whether the current contract includes pathway work. If you are buying or listing a property on that stretch, ask the City.
That is the same stretch where one of our listings, 28042 Balkins Drive, a four-bedroom home on a flat 1.22 acres, was featured in The Acorn in September at an asking price of $2.79 million. Properties like it show why we treat the septic file, the road schedule and the condition of the horse trails as part of pricing.
Quick Answers
Is a septic inspection required to sell a home in Old Agoura? California law does not mandate one for home sales. The County recommends an inspection, and many lenders require one, so check your loan terms and your purchase agreement.
Does the City of Agoura Hills have my septic records? The County does. LA County DPH Environmental Health runs the septic program for Agoura Hills, and records requests go through the DPH Custodian of Records.
Will I have to connect to sewer if it arrives? In the 2021 JPA discussion, staff confirmed there was no legal requirement for homes in these areas to connect. The City lists a feasibility study for extending sewer into Old Agoura as in progress, but we found no announced construction project.
If you are preparing to list an Old Agoura property, Karen Sandvig can help you request the County septic file, collect service records and line up an inspection before you go to market, so buyers see a complete file on the first day. Request a Complimentary Home Valuation & Marketing Plan, and we will include a septic records checklist for your parcel.
