Timberwood Park Septic System Home Sales: Key Checks

"When I was buying my home, the builder made it seem like it was going to be so good having a community septic system," Villas at Timberwood resident Eddie Douglas told Bexar County commissioners in January 2024. "It's easy, it's going to save you time and so much money."

That subdivision has 75 homes north of Loop 1604 and west of U.S. 281. As of September 2026 its homeowners association charges $2,600 a year in dues to keep a shared septic system running and to cover legal costs. The board is also asking San Antonio City Council to waive $415,575 in SAWS impact fees so the neighborhood can shut the system down and connect to city sewer.

Most Timberwood Park buyers will never own a home on a communal system. Still, the Villas story shows something that applies to every address in the 78260 area of Timberwood Park. A home's wastewater setup is its own cost line, set by paperwork, county permits, and utility rules, and the listing photos won't show any of it.

The Service Area Map Doesn't Tell You What's Under the Yard

SAWS added Timberwood Park to its service area after the Villas were built. In 2014 the utility filed a cease-and-desist to stop a proposed second phase, stating that SAWS was the only retail sewer utility authorized to serve Timberwood Park.

That makes SAWS the sewer provider on paper. On the ground, the San Antonio Report described Timberwood Park as a community where homes outside the Villas sit on lots large enough for their own private septic systems. So if a buyer hears "SAWS area," it tells them who would provide sewer service if a connection were ever built. It doesn't tell them whether the house they're touring has one.

The gap matters because SAWS charges for connecting. In its September 2026 statement to the Express-News, the utility said impact fees apply "when new or existing infrastructure connects to the SAWS water and wastewater systems, regardless if it is an existing development." The Villas board had not budgeted for that fee. Board president Roy Block said SAWS had told them it wouldn't apply, and the utility disputes that.

What the Villas Numbers Show About Wastewater Costs

On a typical Timberwood Park lot, a single system serves a single house. The Villas show what happens when the cost of moving off septic gets added up. These figures come from 2024 through 2026 reporting:

At a late September 2026 council discussion, several members pushed back on the waiver. They pointed out that the subdivision sits outside city limits and that SAWS is asking for a rate increase. A city spokesman could not say when the waiver would come up for a vote.

Here is what a buyer elsewhere in Timberwood Park can take from this. Wastewater costs land on the owner, whether they arrive as HOA dues, maintenance contracts, or a connection fee. Before you write an offer, find out which of those costs applies to the address you're looking at.

The Paperwork That Carries the Answer

Texas has a document trail for this. Most buyers skim it.

The Seller's Disclosure Notice. TREC's form 55-1, effective May 28, 2026, asks the seller to mark whether the property has a septic system and whether it has public sewer. These are two separate lines. The form also asks the seller to disclose known defects. It states that it is not a substitute for inspections. If you're a seller, mark both lines accurately. If you're a buyer, read both lines on the current TREC form and compare them with what the listing says.

The on-site sewer facility form. "Information About On-Site Sewer Facility" is TXR 1407, a Texas REALTORS form. TREC doesn't publish it. It records the system's type, location, and age, its maintenance and pumping history, known defects, and permit materials. It also flags that the operating permit may need to be transferred to the buyer. Texas REALTORS recommends attaching it whenever septic is disclosed.

The county permit. In unincorporated Bexar County, Bexar County Environmental Services issues permits for on-site sewage facilities, and TCEQ lists the county as an authorized agent. I could not confirm the county's current transfer procedure or fee schedule from published county material. Treat both as a call to Environmental Services during the option period, and don't assume the permit moves to you automatically.

The inspection. A Texas septic-industry guide updated in February 2026 puts a sale inspection at $300 to $600, taking about two to three hours. The Texas Septic Guide says Texas law generally doesn't require one, but a lender or the contract terms can make it a practical condition. Compared with the costs in the table above, that's a small line item.

Aerobic Systems Carry a Calendar

Many Texas septic systems are aerobic units, and TCEQ treats them differently from a conventional tank. Under a maintenance contract, TCEQ's baseline calls for the system's components to be checked and reported on at least every four months. That can stretch to every six months with approved electronic monitoring.

State guidance lets homeowners maintain eligible aerobic systems themselves after the first two years. It also says local authorities can impose stricter requirements, including prohibiting homeowner maintenance. I could not verify which rule Bexar County applies, so ask the county. Then ask the seller for the current contract, the provider's name, and the most recent inspection reports. A lapsed contract or a stack of skipped reports gives you something concrete to negotiate.

TCEQ also has a staff-initiated rulemaking under way, project 2024-009-285-CE. It covers possible changes to maintenance-contract requirements and the Edwards Aquifer rules. As of this writing I can't confirm that anything has been adopted, so plan around the rules in effect today.

Where the Aquifer Rules Come In

If you plan to add a casita, an addition, or a larger replacement system, Edwards Aquifer rules apply. For a new system on the recharge zone, Chapter 285 generally requires at least one acre per single-family home and planning by a professional engineer or professional sanitarian. Tanks must sit 50 feet from recharge features, and soil-absorption systems 150 feet. Bexar County lots recorded before March 26, 1974 are exempt from the one-acre minimum, subject to conditions, so the recording date on the plat matters.

These boundaries are drawn parcel by parcel. During the council discussion, SAWS CEO Robert Puente said the Villas sit in the contributing zone. The Edwards Aquifer Authority confirmed that the creek bed beside the system flows into the recharge zone. TCEQ's Edwards Aquifer map viewer checks a specific address, and TCEQ requires an approved protection plan before regulated construction in these zones.

2033 Is a Date, and Nothing Changes Automatically

The last piece is timing. In 2007 the City of San Antonio signed an in-lieu-of-annexation agreement covering about 4,345 acres of Timberwood Park. Its term is set to end December 30, 2033, and the City agreed to continue the land's extraterritorial status and immunity from annexation until the agreement terminates. The agreement defers annexation. It does not schedule an automatic annexation for the day after.

Even now, the agreement applies the city's Chapter 34 water and sewer rules throughout the area. At that same council discussion, Councilmember Jalen McKee-Rodriguez said he might be more open to the waiver if the neighborhood agreed to early annexation. For a buyer on a 10-year horizon, 2033 belongs in the same conversation as the septic system, since sewer service and city status are being discussed together at City Hall.

Before the Option Period Ends

1. Confirm in writing whether the home is on septic, aerobic septic, a shared system, or SAWS sewer. Check it against both lines of the TREC 55-1.
2. Request the TXR 1407 and the county permit paperwork, and call Bexar County Environmental Services about transfer requirements.
3. Get the maintenance contract, the provider's name, and recent inspection reports for any aerobic unit.
4. Order a septic inspection, and check your loan terms in case the lender requires one.
5. Run the address through TCEQ's map viewer if you plan any addition or system replacement.
6. If the home is in a subdivision with shared infrastructure, read the HOA budget and minutes for wastewater line items.

A Few Questions I Hear About This

If a home is inside the SAWS service area, can I just hook up later? A connection means building the sewer line and paying SAWS impact fees. SAWS says those fees apply to existing developments too. Ask about cost before you count on it.

Does the Villas situation affect the rest of Timberwood Park? The Villas has its own HOA, and the communal system serves only those 75 homes. Villas residents also pay dues to the Timberwood Park HOA. Its value to other buyers is as a fully documented example of what wastewater costs look like when they come due.

As a seller, what should I gather before listing? Your county permit, your current maintenance contract, your pumping and service records, and a completed TXR 1407. Having them ready before the first showing shortens the option period for everyone.

If you're weighing a septic-served home in Timberwood Park, or getting ready to list one, Lira Realty Group can help you collect the permit, contract, and inspection records before they become a deadline. Schedule a consultation and we'll go through your address together.

This article is general information, not legal, tax or financial advice. Consult a qualified professional about your situation.