Wells & Septic: What to Know Before Buying North Texas Land

Do You Need to Check Wells and Septic Before Buying Land in North Texas?

Yes — before you write an offer on acreage in Parker, Hood, or Erath County, confirm the property can actually support a well and septic system. Requirements vary by county: Parker County requires a minimum of 2 acres for a new well permit, properties 10 acres or larger may qualify for a septic permitting exemption, and well drilling in North Texas runs $8,000 to $30,000+ depending on depth and aquifer. Skipping this check is one of the most expensive mistakes acreage buyers make.

By Savannah Crozier | August 17, 2026

You found the land. Rolling pasture, a good building site, maybe a pond already on it. Before you get attached, there's a question that matters more than the view: can you actually put a house on it?

Out here, "can you build here" almost always comes down to two things — water and waste. If the property doesn't have a working well and a permitted septic system already in place, you need to find out what it'll take to get both, and what it'll cost, before you're under contract.

This is the single most common surprise I see with acreage buyers moving into Parker, Hood, and Erath counties. The land looks perfect. Then the well quote comes back, or the septic evaluator finds soil that won't perk, and the numbers change fast.

Well Requirements Aren't the Same From County to County

There's no single statewide rule for how much land you need to drill a well. It's set locally — by the county, the city, or the groundwater conservation district that covers that property. That means the rules on one side of a county line can be different from the rules on the other.

A few things to check before you assume anything:

• Minimum acreage for a new well. In Parker County, for example, drilling a new well requires a minimum of 2 acres. Erath County has its own groundwater district with separate requirements. Don't assume the rule that applied to your last property applies to this one.
• Which groundwater conservation district covers the property. These districts can add permitting steps and fees on top of whatever the county requires.
• Well cost. Depth and aquifer drive the price, and in North Texas you should budget $8,000 to $30,000 or more. A shallow well on a shared aquifer costs far less than one that has to go deep to hit reliable water.
• Separation distances. State rules require wells to sit at least 50 feet from a septic tank, 100 feet from a drain field, and 50 feet from any property line. On a smaller or oddly shaped tract, this alone can determine where — or whether — a house can go.

If the property already has a well, ask when it was drilled, how deep it is, and whether there's a water quality test on file. An old well that's never been tested is a question mark, not a feature.

Septic Rules Have More Exceptions Than People Think

Texas septic systems — officially On-Site Sewage Facilities, or OSSFs — are governed by state rules under TCEQ, but enforcement and specifics happen at the county level. This is where the "10-acre exemption" gets misunderstood.

Here's the version people repeat: if your property is 10 acres or larger, you don't need a septic permit. Here's the version that actually matters:

• The exemption only applies to a single-family dwelling, and every part of the system still has to sit at least 100 feet from the property line, with all effluent staying on your land.
• Some counties have opted out of the exemption entirely, regardless of acreage, because of soil or groundwater concerns. Never assume the 10-acre rule applies until you confirm it with that specific county's environmental health department.
• The exemption removes the permit requirement — it doesn't remove the requirement that the system actually works for the soil. A poor site evaluation can still mean an expensive system regardless of how many acres you own.
• If you ever sell the property, a buyer's lender or title company may ask for permitting history. An unpermitted system on paper can complicate a future sale even if it was technically exempt.

Before you make an offer, ask whether the property has had a site and soil evaluation. This is what actually determines whether you can install a standard system or need a more expensive aerobic system, and it's the single best predictor of your real cost.

What This Looks Like in Practice

I walk every acreage buyer through the same short list before we write an offer on raw land or a property with an older well and septic setup:

1. Confirm which county and which groundwater district the property falls under.
2. Ask the seller for well depth, well age, and any water quality reports.
3. Ask whether the septic system is permitted, and if not, whether the property genuinely qualifies for the exemption in that county.
4. Get a site and soil evaluation if the property doesn't already have one, especially on land that's never been built on.
5. Budget for the real cost of a new well or system if either one needs replacing — not the number you hope it'll be.

None of this should scare you off good land. Most of the acreage across Parker, Hood, and Erath counties supports wells and septic just fine. But "just fine" is a question you answer before closing, not after you've moved in and the well runs dry in August.

Frequently Asked Questions

Does a 10-acre property in Texas automatically qualify for a septic exemption?

Not automatically. The property must serve a single-family dwelling, keep all system components at least 100 feet from the property line, and dispose of effluent entirely on-site. Some counties have also opted out of the exemption altogether, so you'll want to verify with that specific county's environmental health department before relying on it.

How much does it cost to drill a well in North Texas?

Typically $8,000 to $30,000 or more, depending on how deep the well needs to go and which aquifer it draws from. Get a quote from a local driller before you finalize your offer, not after.

What's the minimum acreage needed for a well in Parker County?

Parker County requires a minimum of 2 acres for a new well permit. Requirements can differ in neighboring counties, so don't assume the same minimum applies once you cross into Hood or Erath County.

Can I build a house on land without city water or sewer?

Yes, most rural acreage in this area relies on private wells and septic systems rather than city utilities. The key is confirming the specific property can support both before you buy, since soil conditions and lot size determine what's possible.

Who do I contact to check well and septic requirements before buying?

Start with the county's environmental health department for septic permitting and the local groundwater conservation district for well permitting. A local site and soil evaluator can also tell you what a specific property will support before you're under contract.

If you're looking at acreage in Parker, Hood, or Erath County, the land itself is only half the picture — what's underneath it and what it takes to develop it is the other half. This is exactly the kind of due diligence I walk clients through before we ever write an offer.

If you're just getting started, grab my free Buyers Guide for a full walkthrough of the process: https://heyzine.com/flip-book/6ce64c2497.html

About Savannah Crozier
Savannah Crozier is a REALTOR® with Magnolia Realty Granbury, serving clients throughout Hood, Parker, Erath, and Palo Pinto counties, including Possum Kingdom Lake. A Tarleton State University Business Marketing graduate and Lubbock native, she specializes in residential, lakefront, and farm/ranch properties, bringing a strategic marketing approach to every transaction. Savannah is part of Magnolia Realty, founded by Chip and Joanna Gaines, known for elevated property presentation and community-focused service.