On a Montgomery County lot, sewer is usually cheaper if a line is already at your property, and septic is usually cheaper if the nearest line is far away or does not exist. The number that decides it is the distance to the nearest sewer connection, not the type of system.
Most buyers compare a septic install with a sewer tap fee and call it done. That is the wrong comparison. The real comparison is what each path costs you on this lot, over the first two years and beyond. Here is how to run the numbers yourself.
The short version
| Sewer | Septic | |
|---|---|---|
| Upfront cost | Tap fee, plus a line extension if no main is at the lot. [RANGE TO BE SET BY JACOB] | Soil evaluation, design, permit, system and install. [RANGE TO BE SET BY JACOB] |
| Cost that surprises people | Extension distance, easements, and district fees | Soil that fails a standard system and forces a more expensive one |
| Monthly | A sewer charge on your utility or district bill | No sewer bill, but maintenance and, on many systems, a service contract |
| Lot impact | Almost none | A reserved area that cannot hold the house, pool or shop |
| Timeline | Depends on the district or city and any extension work | Soil evaluation and county permit before you can pull the house permit |
Why distance to the main matters most
A sewer connection is cheap when the main runs past your lot. It is expensive when it does not. Extending a line to a lot is a per-foot job, and the footage is set by the map, not by negotiation. On a lot in a platted subdivision, the main is usually in the street and the answer is simple. On acreage in unplatted parts of Montgomery County, around Willis, Magnolia, Montgomery and the Lake Conroe edge, the nearest main can be a long way off.
So ask for the distance in feet before you ask for a price. If the district or city will not serve the lot at all, the question is over and septic is your path.
Who provides sewer in Montgomery County
Much of the county's sewer service comes through municipal utility districts, called MUDs, and through cities such as Conroe. Which one covers your lot, if any, is a question about the boundary, not the zip code. Ask the district whether the lot is inside its service area, whether capacity is available, what the tap fee is, and whether the district charges anything on top, such as a tax rate on your property. We cover the district side in our post on what a MUD means for your build.
What septic really costs you
A septic system in Texas is called an on-site sewage facility. It needs a permit from the local authorizing agency, a soil and site evaluation, and a design that fits what the evaluation finds. That last part is where budgets move. Soil that drains well can take a conventional system. Tight clay, which is common across parts of the county, often pushes you to an aerobic system with spray or drip disposal. Those cost more to install and more to keep running.
Plan on these line items, and get a written quote for each one:
- Soil and site evaluation by a licensed evaluator. [RANGE TO BE SET BY JACOB]
- System design and county permit fee. [RANGE TO BE SET BY JACOB]
- The system itself, installed. [RANGE TO BE SET BY JACOB]
- Clearing, grading and any drainage work around the field. [RANGE TO BE SET BY JACOB]
- Maintenance contract, where your system type requires one. [RANGE TO BE SET BY JACOB]
Aerobic systems typically carry a required service contract for the first two years, and many owners keep it after that.
The cost nobody puts in the quote: lot space
A septic field takes ground. It has setback distances from the house, the property line, wells and water. On a one acre lot that space competes with the driveway, a detached shop and a pool. On five acres it barely matters. If the lot is under an acre and not on sewer, have the builder or an engineer lay out the house and the field on the plat before you buy. Many buyers find out the pool does not fit after closing.
Floodplain changes the answer
A lot in a flood zone or with a high water table can limit your septic options, and a sewer line in a low area is a different construction job than one on high ground. This is one reason we pull the parcel record before we talk about utilities.
The lot check we run before you spend a dollar
For every lot we look at, Builder Connect reads the county parcel record. Here is what comes back for your lot:
- Lot size:
{{acres}}acres - FEMA flood zone:
{{flood_zone}} - Sewer and water provider:
{{utility_provider}} - Nearest sewer connection:
{{distance_to_sewer_ft}}feet - Permits pulled within one mile:
{{nearest_permits_1mi}}
That last line tells you what your neighbors chose. If every recent permit nearby is a house on septic, you know what the market in that pocket has been doing.
A simple way to decide
- Find out if the lot is inside a sewer service area. If not, septic is your answer and you budget for it.
- If it is, get the distance to the main in feet. Ask for the tap fee and the extension cost in writing.
- Order the soil evaluation before you close on land when septic is possible. A failed percolation result changes the system type and the price.
- Put the full cost of each path in one column and compare them over the first two years, not just on day one.
- Check the lot layout so the house, the drive and the field all fit.
What this does to a financed build
Lenders want utilities resolved before they fund, so you need a sewer connection or a permitted septic design on paper early. A septic permit takes time, and that time sits in front of your house permit.
What to do next
Do not guess your utility path from a listing photo. Send us the lot address or the parcel number and we will pull the parcel record, check the sewer distance and the flood zone, and tell you in plain terms which path looks cheaper and why.
Send us the lot. We will read the parcel record.
Call Jacob at (346) 273-1143 or email jacob@builderconnect.net.
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