Houston exurbs + DFW fringe
Drain field repair and replacement cost in Texas
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Estimates only. Cost bands are secondary research from 2026 industry guides — not verified local quotes, not a price quote, and not advice to hire anyone. Always get written quotes.
Not legal advice. Rules below are summarized from TCEQ, Texas A&M AgriLife Extension, and county sources linked on this page. Local programs can be stricter than state minimums — confirm with your permitting authority before you act.
Cost bands (estimates from secondary research)
| Fix | Planning band | Notes / source |
|---|---|---|
| Line cleaning / hydro-jetting | ~$200–$1,400 | National (HomeGuide). No verified Texas figure. |
| Rejuvenation (soil fracturing, aeration) | ~$1,000–$5,000 | National (HomeGuide). Buys time on an aging field, not a cure. |
| Solid line / pipe repair | ~$1,000–$4,000 | Texas installer pricing cited by Nearby Septic |
| Replace leach lines | ~$20–$45 per linear foot | National (HomeGuide) |
| Partial / section repair | ~$1,000–$5,000 | Nearby Septic; HomeGuide repair band |
| Full drain field replacement (Texas) | ~$5,000–$20,000 | Nearby Septic and Texas Septic Guide; national HomeGuide band is $3,000–$15,000 |
| Conversion to aerobic when soil fails current criteria | ~$12,000–$25,000 | Texas installer pricing cited by Nearby Septic |
| Site evaluation / soil testing | ~$600–$2,500 | HomeGuide ($600–$2,000 perc testing); Texas Septic Guide ($600–$2,500) |
| County permit | Varies by county | Examples: Denton $100 repair / $310 new; Dallas $260 residential application |
Soil type drives the number more than anything. Clay, shallow rock, or a high water table can mean an engineered design or an aerobic system instead of a like-for-like trench field.
Texas rules for drain field work
- Permit required. Repairing or replacing a drain field (or replacing a tank) needs a permit for the entire system. TCEQ: any disposal-area work must meet current standards.
- Not an emergency repair. The no-permit-first emergency list covers tank lids, inlet/outlet devices, risers and caps, disinfection devices, damaged drip tubing, and solid lines — with written notice to the permitting authority within 72 hours. Trenching a new field isn’t on the list.
- Grandfathered systems lose the exemption when they need repair, so an old unpermitted system’s repair is designed and permitted to today’s rules.
- New planning materials: expect a site evaluation by a licensed Site Evaluator or professional engineer before the permitting authority approves a replacement; the authority then has 30 days to approve or deny.
- Right installer class: Installer I covers standard drain fields; an aerobic or other advanced replacement needs an Installer II.
Rule out cheaper causes first
- Full tank or skipped pumping (solids moving into the field) — see the pumping table
- Clogged effluent filter
- Broken or missing outlet tee/baffle
- Failed effluent pump or float (pumped systems)
- Crushed solid line between house, tank, and field (driving over it)
- Too much water: leaks, back-to-back laundry, roof runoff onto the field
Repair or replace? Questions to ask
| Question | Why it matters |
|---|---|
| What exactly failed, and how do you know? (tank opened, filter checked, lines probed or camera-inspected) | “Your field is shot” without a written diagnosis isn’t a diagnosis. |
| How old is the field and what soil is it in? | TCEQ notes older systems were often designed from perc tests that missed limiting soil layers; an aging field in clay often isn’t worth patching. |
| Does the wet area show up in dry weather? | Ponding only after storms may be a runoff problem; wet ground in a dry spell points to the field. |
| Will the replacement have to be a different system type? | Current standards apply; if the soil fails them, the design may change — and so does the price. |
| Who files the permit, and is the fee in the quote? | Work done without a required permit leaves the owner exposed. |
Quote checklist
- Written diagnosis attached to the bid
- Installer’s TCEQ license class and number (verify)
- Site evaluation and design: included or separate? Who performs them?
- Permit filing and fee shown as a line item
- Pump-out of the tank before work (often needed) — by a registered sludge transporter
- Yard restoration, sod, tree removal, electrical (if pumped or aerobic)
- Warranty terms in writing; payment schedule (TCEQ: don’t pay large sums up front; Texas Property Code 162.006 trust-account rule applies over $5,000 under a written contract)
- At least three bids for the same scope
Skip “miracle” additives sold as a field fix — TCEQ advises against septic additives.
Related guides
- Septic failure warning signs (and heavy rain)
- Texas septic rules and permits (TCEQ basics)
- Aerobic vs conventional septic in Texas
- Septic inspection: what it covers and costs
- Houston-area county permit notes (Harris, Fort Bend, Montgomery)
Sources
- Texas repair $1,000–$5,000, replacement $5,000–$20,000, solid line $1,000–$4,000, aerobic conversion $12,000–$25,000 (from named Texas installer price lists) — Nearby Septic: drain field repair cost in Texas (2026)
- National replacement $3,000–$15,000, repair/rejuvenation $1,000–$5,000, leach lines $20–$45/ft, perc testing $600–$2,000, hydro-jetting $200–$1,400 — HomeGuide: drain/leach field replacement cost (Dec 2025)
- Drain field replacement $5,000–$20,000 — Texas Septic Guide: maintenance cost (2026); site evaluation $600–$2,500 — Texas Septic Guide: installation cost (2026)
- Permit for tank/field replacement; current standards for disposal area; pre-1997 perc tests; additives; payment advice — TCEQ: Advice for an Owner of an OSSF
- Permit requirement and grandfather exemption ending when repair is needed — 30 TAC §285.3; emergency list and 72-hour notice — 30 TAC §285.35; 30-day review and site evaluation — TCEQ: Getting a Permit
- Installer I vs II scope — TCEQ OSSF licenses
- Permit fee examples — Denton County handout; Dallas County application