The Texas 10-Acre Septic Exemption Doesn't Apply in Kaufman County

What is the Texas 10-acre septic exemption?

The Texas 10-acre exemption is one sentence in the state septic rules, 30 TAC 285.3(f)(2). It says no planning materials, permit, or inspections are required for an on-site sewage facility (OSSF) serving a single-family dwelling on a tract of 10 acres or larger, as long as four conditions hold and the system still complies with every other requirement in Subchapter D, the chapter's design and installation standards.^source

Read that last part twice. The exemption removes the paperwork and the county inspection. It does not remove the engineering. The tank still has to be sized right, the setbacks to wells and water still apply, and the disposal field still has to match the soil.

TCEQ's own permit page lists one more condition in its summary of the exemption: the property should get a site evaluation by a TCEQ-licensed site evaluator or a professional engineer. That tracks with the rule, because Subchapter D includes the site evaluation standard.^source

Does the 10-acre exemption apply in Kaufman County?

No, not in unincorporated Kaufman County. The county's OSSF order, approved by TCEQ on February 11, 2022, lists its stricter local rules in Section 10. The first one, 10(A), says all single-family dwellings located on a tract, regardless of acreage size, require a permit to construct, alter, or repair an on-site sewage facility.^source

That line exists to close the 10-acre door. The same rule is repeated word for word in the county's Subdivision and Land Development Regulations, Section 9.04, so it shows up in both the septic order and the land development rules.^source

So a 40-acre place off an FM road outside Kemp needs the same OSSF permit as a one-acre lot near Forney. Acreage changes where the system can go. It does not change whether you need the permit. Our Kaufman County septic permit process page walks through what that permit involves.^source

Why the state rule and the county order disagree, and which one wins

The state rule is a floor, not a ceiling. Chapter 366 of the Texas Health and Safety Code lets a county become an authorized agent and run its own OSSF program, and 30 TAC 285.3(a) says the executive director is the permitting authority only where no local order has been approved. Kaufman County has one.^source

Section 10 of the county order says it plainly: where the county adopted a more stringent rule, the local rule takes precedence over the corresponding TCEQ requirement. TCEQ approved the order knowing that, and TCEQ's own permit page says local programs can be more stringent than state minimums.^source

That's why so many search results say 'you don't need a permit on 10 acres in Texas.' They're describing the state default. They're right for a county that never adopted a stricter rule, and wrong for Kaufman County.^source

Where the Texas exemption could still matter

The county order covers unincorporated Kaufman County plus any city that has an intergovernmental contract with the county. It does not cover areas inside incorporated cities that run their own program. The county's own FAQ tells Terrell and Oak Ridge residents to contact their cities about septic, not the county.

Inside a city with its own OSSF program, that city's order decides the question. Very few in-city tracts are 10 acres, but if yours is, ask that city directly rather than assuming either answer.

The other place it matters is a parcel that turns out to be in a different county. Near Poetry and other edges of the county, confirm the county on the appraisal record first. Our city vs. county septic permit guide covers how to check.^source

• Unincorporated Kaufman County: permit required on any acreage (county order 10(A))^source
• City with its own OSSF program: the city's rules decide, so ask the city
• Parcel actually in a neighboring county: that county's order decides
• Area with no local program at all: the TCEQ regional office applies the state rule, including the exemption

Don't confuse the 10-acre exemption with the old-system grandfather rule

The rule people often mix up with the 10-acre exemption is 30 TAC 285.3(f)(1), which covers old systems. An OSSF that is not creating a nuisance doesn't have to meet current permitting rules if it was installed before September 1, 1989, has not been altered, and doesn't need repair.^source

There's a local twist. Where a county already had an approved order before September 1, 1989, the cutoff in 285.3(f)(1)(B) is the effective date of that order instead. Kaufman County's order references an original order effective January 1, 1988, so the working cutoff here may be 1988, not 1989. Ask Development Services which date they apply to your system.

Either way, the grandfather status ends the moment the system is altered, needs repair, or causes a nuisance. On an old place, that usually means the first real failure puts you into a full permit.^source

What the exemption never excused, even where it applies

Even in a place where the 10-acre exemption is valid, it only waives the permit, the planning materials, and the inspection. Everything else keeps applying, and some of it matters more in Kaufman County than most places.^source

Nuisance is the big one. The state rule defines a nuisance to include surfacing sewage, an overflow from a tank, or groundwater contamination by any OSSF part. On Blackland Prairie clay, an undersized conventional field can surface after a wet spring, and the exemption disappears the day it does.

• Design standards: tank sizing, soil-matched disposal, and setbacks in Subchapter D still apply
• Nuisance rules: surfacing effluent or runoff makes the owner liable under state law regardless of acreage
• Licensing: Kaufman County says you must hold a TCEQ license to install or repair any part of a septic system, sprinklers included^source
• Aerobic rules: the county requires a maintenance contract on every aerobic system, inspections every four months, and purple subsurface pop-up spray heads timed between 12am and 5am^source
• Lenders and buyers: an appraiser, lender, or buyer's inspector will usually ask for permit and approval records, and 'I had 10 acres' is not a record^source

10-acre septic myths we hear in Kaufman County

Most of the trouble we see starts with a half-true sentence from a neighbor, a seller, or a forum. Here are the common ones, set against what the rules actually say.

What 10 acres does buy you in Kaufman County

Acreage buys options, not exemptions. On a big tract the site evaluator has room to put the treatment and disposal area where the soil is best, away from the pond, the barn, and the draw that floods every May.

Sometimes that means a conventional system is possible on a sandy rise, which can run $6,000-$10,000 instead of $12,000-$18,000 for an aerobic system. More often in Kaufman County's clay, it still means aerobic, just laid out better. The soil and site evaluation is what decides, and it usually runs $350-$700.

Plan on the county permit as a normal line item. The site's planning range for the county OSSF permit is $400-$550, and the county order adds a $10 state fee per permit that goes to TCEQ. Confirm the current amounts with Development Services before you budget, and see our guide to septic system installation in Kaufman County for the full cost picture.^source

Checklist before you build on 10+ acres in Kaufman County

Run this list before you pick a house pad, not after. On acreage the septic layout often decides where the house, shop, and driveway can go.

What to do if someone says you're exempt

Ask which rule they mean, then check it against the county order. If an installer, seller, or builder says your Kaufman County acreage doesn't need a septic permit, ask them to put the reason in writing and name the section. If they can't, you have your answer.^source

The simplest check is a phone call. Kaufman County Development Services is at 101 N. Houston Street in Kaufman, (469) 376-4127, and OSSF questions can go to publicworks@kaufmancounty.net. Give them the property ID from the appraisal district and describe what you plan to build.

If you're buying acreage with an existing system that was never permitted, treat that as a negotiation item, not a footnote. Our list of septic questions to ask before buying acreage covers what to request from the seller.^source