Installer I or Installer II, depending on the field
TCEQ's license page gives Installer I septic tanks, absorptive drainfields, unlined evapotranspiration drainfields, leaching chambers, gravel-less pipe and pumped effluent drainfields. Installer II covers all types. So a field type that isn't on Installer I's list needs an Installer II, and the company should be able to tell you which class it holds; TCEQ's licensing line is (512) 239-6133.
Drainfield costs in Texas: our range beside EPA's
Our range is $690 to $4,650 per repair, an estimate, not a quote. One national range scaled by the Texas operating engineer wage ratio sets it, because no Texas company publishes a drainfield price we could count.
EPA's national band for repairing or replacing a malfunctioning conventional system is in the table, and the county permit fee is in neither figure.
| Item | Figure | What it is |
|---|---|---|
| Estimated range, not a quote | $690 to $4,650 per repair | Built from one national published range, adjusted by the Texas operating engineer wage ratio (0.81). Eight Texas septic companies publish a price we could count on their own websites; where five or more price the same job, the range is the middle half of their prices, and where two to four do, the estimate is widened to take them in. Coupons, specials and figures a page gives as an average are not counted. Basis: no state company sample (no counted Texas company price for this job), national estimate only. |
| Estimated range for a full drain field replacement, not a quote | $2,075 to $14,000 per replacement | Built from one national published range, adjusted by the Texas operating engineer wage ratio (0.81). Eight Texas septic companies publish a price we could count on their own websites; where five or more price the same job, the range is the middle half of their prices, and where two to four do, the estimate is widened to take them in. Coupons, specials and figures a page gives as an average are not counted. Basis: no state company sample (no counted Texas company price for this job), national estimate only. |
| Fixing or replacing a failed conventional system, U.S. EPA national figure | $5,000 to $15,000 | EPA's band covers both repair and replacement nationally, and alternative systems can cost more. |
Estimated range. Built from national published ranges (1 source), adjusted by Texas's operating engineer wage ratio to the US (0.81, BLS May 2025). Not a quote. Eight Texas septic companies publish a price we could count on their own websites; where five or more price the same job, the range is the middle half of their prices, and where two to four do, the estimate is widened to take them in. Coupons, specials and figures a page gives as an average are not counted. We have no counted Texas company price for this job, so the range is our national estimate alone. Full method. Prices as of Oct 23, 2026.
The evaluation, plan and permit that come first
A licensed site evaluator or professional engineer evaluates the site before the application goes in. The permitting authority then has 30 days to approve or deny the planning materials and the application, and a denial comes with a written explanation. Altering or extending a system needs the permit too. An older system keeps its grandfathered status only while it hasn't had a significant increase in use and hasn't been otherwise altered.
What some counties charge for field work
County schedules split repair from new work in different ways. Bell County's public health district charges one half of the current permit fee for altering or repairing an existing treatment or disposal system and the full fee for new treatment or disposal, under its May 15, 2024 revision. Brazos County lists $100 for a modification or repair (revised 9/18/2025). Hays County lists $310 for a minor alteration and $510 for a major one, plus the $10 state fee on every application.
Drainfield signs that need a call today
- Sewage is pooling on top of the drainfield or coming back up into the house.
- The ground over the field stays wet and smells of sewage.
- Grass that grows greener over the field while drains work normally.
Before a company digs
- Note where the wet ground is, and when you first saw it.
- Ask the company for its TCEQ installer license class and number.
- Ask who books the site evaluation and who files the permit.
- Ask the county office for its fee for a repair or alteration.
Permit and plan for a drainfield
Repairing or altering the field needs a permit and approved plan from the county or other authorized agent, and TCEQ's page says a local program may be stricter than the state minimum. TCEQ is also rewriting all of 30 TAC Chapter 285 under House Bill 4087 of 2023, with staff estimating completion by Spring 2026. Ask the office which version it applies to your design.
Questions people ask
Who can repair a septic drain field in Texas?
A TCEQ-licensed installer of the right class, or you, as owner of a single-family home on your own property. Installer I's list includes absorptive drainfields and Installer II covers all systems. The owner exemption in 30 TAC 30.244 doesn't extend to anyone you pay, who must be a licensed installer.
Does a drain field repair need a permit in Texas?
Yes, with an approved plan, from the county or other authorized agent. A site evaluation by a licensed evaluator or engineer comes first, and the authority has 30 days to decide.
What will a drain field cost me in Texas?
$690 to $4,650 per repair in our model. That's an estimate, not a quote, and county fees are separate: Hays County lists $310 for a minor alteration and $510 for a major one.
- TCEQ: Occupational Licenses: On-Site Sewage Facilities Read Oct 23, 2026.
- TCEQ: OSSF Program Contacts Read Oct 23, 2026.
- TCEQ: Getting a Permit for an OSSF Read Oct 23, 2026.
- Bell County Public Health District: On-Site Sewage Fees (PDF) Read Oct 23, 2026.
- Brazos County Health District: EH Fee Schedule (PDF) Read Oct 23, 2026.
- Hays County: Development Services Fee Schedule (PDF) Read Oct 23, 2026.
- U.S. Bureau of Labor Statistics, OEWS May 2025: Operating Engineers and Other Construction Equipment Operators (SOC 47-2073), Texas, mean hourly wage Read Oct 23, 2026.
- U.S. Bureau of Labor Statistics, OEWS May 2025: Operating Engineers and Other Construction Equipment Operators (SOC 47-2073), United States, mean hourly wage Read Oct 23, 2026.
- SepticMatch: how we estimate costs, Texas (editorial policy) Read Oct 23, 2026.
- EPA: Why Maintain Your Septic System Read Oct 23, 2026.
- TCEQ: Rule Changes for On-Site Sewage Facilities Read Oct 23, 2026.
- 30 TAC 30.244 (Texas Register / SOS TAC page) Read Oct 23, 2026.