The Disclosure Paperwork Just Got Longer for Flower Mound's Acreage and Septic Sellers

Two versions of the same form exist right now, and only one of them is legal to use if you're putting a Flower Mound property on the market this fall. The old Texas Seller's Disclosure Notice asked a handful of yes-or-no questions about water and sewer service. The version that became mandatory on July 1, 2026 adds a standalone Water Notice, questions about private road maintenance agreements, above-ground fuel tanks over 500 gallons, and conservation easements. For a house in a subdivision on city water and city sewer, most of that new paperwork is a quick series of "no" checkboxes. For a good share of Flower Mound's acreage, lake-adjacent, and older custom-home properties, it isn't quick at all, because those are exactly the properties the new questions were written for.

That distinction matters more in Flower Mound than in most DFW suburbs, because Flower Mound isn't only golf-course subdivisions and Lewisville ISD cul-de-sacs. Land listings near Lake Grapevine right now include a 17.31-acre estate lot minutes from the North Shores and a 0.36-acre lake parcel with no HOA, both marketed with septic already prepped or approved. Older sections still carry properties where a torn-down house left behind a removed septic system and a city sewer connection that was never activated. These parcels sit inside the same town limits as the golf-course subdivisions most buyers picture when they think of Flower Mound, and as of this summer, they carry disclosure obligations that a lot of sellers, and more than a few agents, haven't fully absorbed yet.

What actually changed on the form

The Texas Real Estate Commission adopted the updated Seller's Disclosure Notice and the new companion Water Notice on May 4, 2026. Both became mandatory for contracts signed on or after July 1, 2026. Here's what shows up now that didn't before:

For a tract home in a section with municipal water and sewer, most of that table resolves to a page of "no" answers. For a Flower Mound property with a septic system, a private well, a shared gravel road back to a lake lot, or a propane tank feeding a house off the natural gas grid, it's a real amount of documentation to assemble, and none of it can be improvised the week before closing.

Flower Mound looks like a finished suburb. Not every parcel is

Most of Flower Mound reads as fully built out, and for the majority of homes that's accurate. But the town's Property Search records and its own septic program describe a different reality for a meaningful slice of the map. The Town of Flower Mound is the entity TCEQ designated as the Authorized Agent for on-site sewage facilities within town limits, which means Flower Mound doesn't just defer to the state on septic. It runs its own permitting, inspection, and enforcement program for every OSSF in the town, from acreage estates near the lake to older properties that predate current sewer lines.

That authority comes with a local ordinance that in places is stricter than what state law requires on its own. The town's rules apply to new construction, remodels, and even secondary projects like pools, patios, and accessory buildings on a lot served by septic, meaning a homeowner who wants to add a pool on an acreage lot may need septic sign-off before the pool permit even gets reviewed.

The maintenance record most sellers don't keep

Here's where the disclosure requirement runs into a practical wall. If a property's septic system uses secondary or aerobic treatment, Flower Mound's own rules require an ongoing maintenance contract with a town-registered provider, and that provider has to inspect the system at least three times a year. Conventional systems don't carry that same maintenance-contract requirement, but they still need regular inspection to check sludge and scum levels before pumping becomes urgent.

The Water Notice doesn't ask for a certified engineering report. It asks what the seller knows: system type, approximate age, whether a maintenance contract exists, and any known defects or malfunctions. For a seller who has lived on a well-maintained system for a decade and kept the paperwork, that's a fifteen-minute form. For a seller who inherited the house, or who has simply never thought about the septic tank because it's never given them a reason to, reconstructing three years of inspection history a week before a buyer's option period ends is a much harder problem, and one that can stall or unwind a contract if it surfaces too late.

The town has tried to close that knowledge gap directly. Its Environmental Health Division periodically runs a free public class on septic system fundamentals, covering the difference between aerobic and anaerobic systems, the permitting process, and basic homeowner maintenance. It's aimed at current owners, but the same information is exactly what a seller needs before listing a septic property, not after an inspector flags something during the option period.

What this means if you're listing this fall

None of this is a reason to avoid buying or selling acreage in Flower Mound. Land near Lake Grapevine, no-HOA lake lots, and large custom parcels remain some of the more distinctive inventory in the northern suburbs, and the paperwork exists to protect both sides of the transaction, not to complicate it for its own sake. But the order of operations has shifted. The documentation now needs to be gathered before a property goes live, not assembled reactively once a buyer's inspector asks a question the seller can't answer.

Before listing a septic, well, or acreage property in Flower Mound this fall, it's worth having on hand:

• The most recent septic maintenance contract and the last three inspection reports, if the system is aerobic
• Pumping records for a conventional system, even informal ones from a service company
• Any written agreement covering a shared or private road
• Documentation on above-ground fuel tanks, including tanks that are empty or no longer in use
• Water well test results, if the property has a private well, along with any known history with a groundwater conservation district

Questions worth settling before your first showing

Do I need to fill out the Water Notice if my home is on city water? Yes, but for most city-water properties it resolves to a short series of "none of the above" answers. The form still has to be completed and attached.

What if I don't have maintenance records for my septic system? Contact a town-registered maintenance provider to schedule an inspection now rather than waiting for a buyer to request one. Flower Mound keeps a current list of registered providers, and having a fresh inspection in hand before listing removes a common point of renegotiation later in the process.

Does this apply to a home I'm selling as-is? Selling as-is affects who pays for repairs. It does not remove the disclosure requirement. The Water Notice and the updated Seller's Disclosure Notice still have to be completed and delivered regardless of how the property is marketed.

Flower Mound's acreage and lake-area inventory is part of what makes the town worth paying attention to, and getting the paperwork right the first time keeps a good property moving instead of stalling in the option period over a form nobody read closely enough. If you're weighing a listing on a septic, well, or acreage property in Flower Mound this fall, Lorraina Moore at DFW Moore Homes can walk through exactly what your specific parcel needs before it goes live. Let's Connect.