Drain Field Replacement Cost in 2026: Septic Leach Field Prices
Septic drain field replacement costs $3,000 to $15,000, with a national average of $7,900 (HomeGuide, Dec 2025). A conventional trench field typically runs $5,000 to $15,000 and a mound $10,000 to $20,000 (The Septic Guide, Mar 2026). When the field can be saved, repair or rejuvenation costs $1,000 to $5,000.
Replacing a septic drain field (also called a leach field) costs $3,000 to $15,000, with a national average of $7,900, according to HomeGuide (Dec 22, 2025). The full span runs from $1,000 to $25,000. Field size, soil, slope and access set the price, and HomeGuide says labor is usually 60% or more of it.
The type of field matters most. The Septic Guide (Mar 2026) puts a conventional replacement at $5,000 to $15,000 and a mound at $10,000 to $20,000, the same two bands our drain field repair-or-replace planner uses. If the field can be saved, repair or rejuvenation costs $1,000 to $5,000 (HomeGuide). That's why an inspection should come before a replacement quote.
Septic Tank Pumping Pros connects homeowners with independent local septic pros who diagnose the field, pull the permit and quote the job. The ranges below are national 2026 figures from HomeGuide, Angi, HomeAdvisor and The Septic Guide, not bids. Answer a few questions in the planner below to see whether your symptoms point to repair or replacement.
Typical national range
$3,000 – $15,000
HomeGuide's average is $7,900 (Dec 22, 2025). Conventional fields run $5,000–$15,000 and mounds $10,000–$20,000 (The Septic Guide, Mar 2026).
Cost breakdown
| Item | Typical range | Notes |
|---|---|---|
| Drain field replacement (national range) | $3,000 – $15,000 | HomeGuide, average $7,900. The same range as the drainfield row in our installation cost guide. |
| Conventional (gravity) field replacement | $5,000 – $15,000 | The Septic Guide (Mar 2026). Our drain field planner uses this band. |
| Mound or other engineered field | $10,000 – $20,000 | The Septic Guide's mound range; HomeGuide lists a mound drain field at the same $10,000–$20,000. |
| Drain field repair (D-box, pipes, lines) | $1,000 – $5,000 | HomeGuide. Our planner's repair path uses the same range. |
| Leach field rejuvenation | $1,000 – $5,000 | HomeGuide and The Septic Guide. Soil fracturing or jetting to break up biomat. |
| Field line replacement (per linear foot) | $20 – $45 | HomeGuide. The per-foot rate our planner and system cost calculator use. |
| Distribution box replacement | $500 – $1,500 | HomeGuide and The Septic Guide. |
| Septic inspection to diagnose the field | $200 – $900 | Angi, average $550 (Oct 7, 2026). The range our planner shows when it says to inspect first. |
| Perc (soil) test | $600 – $2,000 | HomeGuide. Often required before a replacement field is designed. |
| Permits and county fees | $250 – $2,300 | The range our planner and calculator use. HomeGuide lists drain field permits at $250–$650; Angi at $450–$2,000. |
| Pump the tank before field work | $300 – $700 | HomeGuide says pumping is required when a new drain field is installed. |
| New septic tank and leach field together | $4,500 – $20,000 | HomeGuide. Angi's range for a tank and drain field is $5,000–$12,000. |
| Move a leach field to a new spot | $5,500 – $21,500 | HomeGuide, including the new field, a new line from the tank and abandoning the old field. |
What changes the price
Providers quote their own work — these are the factors that consistently move the number.
- Field type: HomeGuide puts a conventional (anaerobic) field at $2,000–$6,000 and a mound at $10,000–$20,000, and the soil evaluation decides which you're allowed to build.
- Field size: tanks and fields are sized by bedroom count and soil absorption, so a larger home on slow clay needs much more trench than a small home on sand. The planner above gives a rough area estimate.
- Labor and excavation: HomeGuide says labor is usually 60% or more of the cost, and Angi puts the average labor bill around $3,600. HomeGuide lists excavation at $2.50–$15.00 per cubic yard.
- Soil testing and permits: a perc test runs $600–$2,000, and permits run $250–$2,300 depending on the county (HomeGuide; our planner).
- Site obstacles: HomeGuide prices tree removal at $400–$1,200 per tree, and a field that has to move adds a new line from the tank at $40–$180 per linear foot.
- Restoration: HomeGuide puts sod over the new field at $1–$2 per square foot installed.
Septic drain field replacement cost by type
HomeGuide's averages by field type (Dec 22, 2025) are $2,000–$6,000 for an anaerobic (conventional) field, $7,000–$10,000 for an aerobic field, $8,000–$15,000 for an evapotranspiration field, and $10,000–$20,000 for a mound. Angi's averages by type (Jul 8, 2026) are about $5,000 for anaerobic, $7,000 for aerobic, $8,000 for evapotranspiration and $12,000 for a mound. HomeAdvisor puts installing a new leach field at $5,000 to $12,000.
The Septic Guide (Mar 2026) splits it further: a conventional gravel trench at $3,000–$10,000 for the field alone, chamber systems at $4,000–$12,000, sand filters at $7,000–$15,000, drip distribution at $8,000–$18,000, and mounds at $10,000–$20,000. Its all-in range for a conventional replacement is $5,000–$15,000. The ranges differ partly because some count only the field and others include design and permits. Our planner quotes the all-in $5,000–$15,000 conventional and $10,000–$20,000 engineered bands.
Drain field repair vs. replacement cost
Repair or rejuvenation costs $1,000 to $5,000 (HomeGuide). Replacing field lines runs $20 to $45 per linear foot, and hydro-jetting the lines costs $200 to $1,400. The Septic Guide breaks rejuvenation down further: soil aeration or fracturing $1,000–$3,000, hydro-jetting $500–$1,500, bio-remediation $500–$2,000, or $2,000–$5,000 for a full package.
The drain field planner follows the same decision order as a good inspector. If the problem is a crushed or root-invaded pipe, a broken distribution box, or an overfull tank, it's usually a $1,000–$5,000 repair. If the field is saturated and clogged with biomat, it usually needs replacing. If you have symptoms but no diagnosis, start with an inspection ($200–$900, averaging $550 per Angi), because an overdue tank can look like a failing field from inside the house.
Cost to replace a septic tank and drain field together
HomeGuide puts a new septic tank and leach field at $4,500 to $20,000, and The Septic Guide puts a complete replacement at $8,000 to $20,000 or more. Angi's range for replacing a septic tank and drain field is $5,000 to $12,000 (Jul 8, 2026). In Angi's breakdown, a new tank alone runs $3,000 to $10,000 and a drain field alone around $7,000.
If your tank is sound, replacing only the field saves money; The Septic Guide estimates savings of $3,000 to $7,000 compared with a full system. If both have failed, our septic tank replacement cost guide covers the tank side, and the septic system installation cost guide covers a full new system ($3,590–$12,463 for most homes, per HomeAdvisor).
What else goes into a drain field replacement quote
The field itself is only part of the bill. HomeGuide lists a perc test at $600 to $2,000, drain field permits at $250 to $650, pumping the tank (required before a new field goes in) at $300 to $700, and excavation at $2.50 to $15.00 per cubic yard. Angi puts drain field permits at $450 to $2,000 and its average perc test at about $1,300. Our planner uses a $250–$2,300 permit range to cover both.
Site work adds more. Removing a tree costs $400 to $1,200, and sod over the finished field costs $1 to $2 per square foot installed (HomeGuide). Angi adds yard regrading at $1,000 to $3,300 when the work leaves the yard uneven. Ask for an itemized quote that lists the field size, the permit and test fees, and restoration.
Cost to move a septic leach field
Moving a leach field to a new spot costs $5,500 to $21,500, according to HomeGuide. That includes the new field plus a new line from the tank at $40 to $180 per linear foot ($1,600 to $7,200 on average), $1 to $5 per square foot to excavate the old field, $0.40 to $2.00 per square foot to fill and regrade it, and a $100 to $250 permit to abandon it.
Fields usually move because the old area is worn out, too wet, or in the way of a building project. The new location still has to pass a soil evaluation and meet the county's setbacks, so the perc test and permit come first.
Drain field replacement near me: permits and local soil
Every county handles drain field permits a little differently, and HomeGuide says permits are required for all drain field installations and replacements. In Texas, TCEQ requires a permit and an approved plan to repair or extend an on-site sewage facility, and a preconstruction site evaluation by a licensed site evaluator or professional engineer, including a soil analysis of the proposed disposal area. Emergency repairs don't need a permit first, but they must be reported in writing within 72 hours (TCEQ, updated Aug 10, 2026).
Soil sets the design and much of the price. Clay and other slow-draining soils need more absorption area, or an engineered field, than sandy ground. Our county pages cover local soil and permit offices, and we connect homeowners with independent local pros who diagnose fields before quoting a replacement.
How we built these numbers
The short version. Every price on this page comes from a published, cited national cost guide. When no source publishes a figure we need, we make an estimate, label it as an estimate, and show how we got it. These are planning ranges, not quotes. This page is published by Cornelia Cove LLC.
How each range was built:
Headline range ($3,000–$15,000), average ($7,900) and full span ($1,000–$25,000). As published by HomeGuide's leach or drain field replacement cost guide (Dec 22, 2025). The repair, rejuvenation, per-foot line, by-type, tank-and-field, moving and add-on costs are from the same page. We didn't compute a median, and none is published.
Conventional ($5,000–$15,000) and mound ($10,000–$20,000) bands. As published by The Septic Guide's drainfield replacement cost guide (updated Mar 2026), along with its rejuvenation breakdown and field-type ranges. These match the bands in our drain field repair-or-replace planner.
Angi figures. Averages by type, the $5,000–$12,000 tank-and-field range, permits ($450–$2,000), perc test (about $1,300), labor (about $3,600) and regrading are from Angi's septic tank and drain field guide (updated Jul 8, 2026). The inspection range ($200–$900, average $550) is from Angi's septic inspection guide (updated Oct 7, 2026). HomeAdvisor's leach field figure ($5,000–$12,000) and full-system range are from its septic system cost page (updated Jun 20, 2026). Angi and HomeAdvisor are the same company, so we count them as one source.
Distribution box ($500–$1,500). As published by HomeGuide's septic tank repair cost guide (Dec 22, 2025) and The Septic Guide.
Permits ($250–$2,300). The range our planner and system cost calculator use, shown so this page and the tools match; the published ranges it covers are listed beside it.
Texas permit rules. From TCEQ (updated Aug 10, 2026).
Date window. Source pages were published or updated between Dec 22, 2025 and Oct 7, 2026, and all were accessed Oct 18, 2026.
How we choose figures: As published. We copy a source's range exactly. We don't round, blend or adjust for inflation. One primary source per figure. When several sources publish the same figure, we use the most recently updated page. When sources disagree by a lot, we show both. Same numbers everywhere. This page, the embedded planner, our system cost calculator and our installation cost guide use the same drain field figures.
Limits. These ranges are national, not local, and prices in your county can fall outside them. They aren't quotes, because we don't survey contractors. Soil, field size, access and county rules all move real prices.
Reusing this data. The cost tables on this page are licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). You can reuse them with attribution and a link back to this page. Suggested credit: Source: Septic Tank Pumping Pros, Drain Field Replacement Cost (Cornelia Cove LLC), https://septictankpumpingpros.com/cost/drain-field-replacement-cost
Corrections. Spot a wrong or outdated figure? Email partners@corneliacove.com. We check reported errors against the cited source, then update the page and its review date.
Last updated: October 2026. We refresh these tables at least once a year.
Frequently Asked Questions
How much does it cost to replace a drain field?
HomeGuide puts drain field replacement at $3,000 to $15,000, averaging $7,900. A conventional field typically runs $5,000–$15,000 and a mound $10,000–$20,000 (The Septic Guide). Permits, a perc test and pumping the tank add to the total.
How much does a mound drain field cost to replace?
HomeGuide and The Septic Guide both put a mound drain field at $10,000 to $20,000, and Angi's average for a mound is about $12,000. Mounds cost more because of the imported sand and the pump that doses effluent into them.
Can a drain field be repaired instead of replaced?
Often. Repair or rejuvenation costs $1,000 to $5,000 (HomeGuide), and replacing individual lines runs $20–$45 per linear foot. A crushed pipe, a broken distribution box or an overfull tank can be fixed; a field saturated with biomat usually needs replacing. Get an inspection first.
How long does a drain field last?
HomeGuide says 20 to 25 years if it's properly built and maintained, and The Septic Guide says 15 to 30 years, with neglected systems failing in under 10. Pumping the tank every 3 to 5 years keeps solids out of the field.
How long does it take to replace a leach field?
HomeGuide says 3 to 7 days on average, plus 2 days if a new perc test is required. The final inspection typically happens 1 to 2 weeks after the field is installed.
Do I need a permit to replace my drain field?
Yes, in most places. HomeGuide says permits are required for all drain field installations and replacements and lists them at $250–$650; Angi's range is $450–$2,000. In Texas, TCEQ requires a permit and an approved plan to repair or extend a system.
Can I replace a drain field myself?
HomeGuide advises against it: replacement takes permits, heavy excavation equipment and a crew, and local codes may require a new perc test. A bad install can cause septic failure and property damage.
Estimates only — independent local providers quote their own pricing. Data last reviewed 2026-10.
Sources
- HomeGuide — Leach or Drain Field Replacement Cost (Dec 22, 2025) (third-party estimate)
- The Septic Guide — Drain Field Replacement Cost (Mar 2026) (third-party estimate)
- Angi — Cost to Replace a Septic Tank and Drain Field (updated Jul 8, 2026) (third-party estimate)
- Angi — How Much Does a Septic Inspection Cost? (updated Oct 7, 2026) (third-party estimate)
- HomeAdvisor — How Much Does a Septic System Cost? (updated Jun 20, 2026) (third-party estimate)
- HomeGuide — Septic Tank Repair Cost (Dec 22, 2025) (third-party estimate)
- TCEQ — Getting a Permit for an OSSF (updated Aug 10, 2026)
Related services
Free tools for this job
Septic System Cost Calculator — Install & Replacement
Itemized 2026 cost ranges for new septic systems, replacements, tanks, and drainfields — by system type, home size, and soil situation.
Use the free tool →Perc Test Cost Calculator & Results Interpreter
What a perc test costs and what your results mean for conventional vs. engineered septic system costs — before you buy land or budget a replacement.
Use the free tool →Septic Problem Diagnostic — What's Wrong With My System?
Sewage backup, alarm going off, odors, or slow drains? Answer a few questions to find the likely cause and how urgent it is.
Use the free tool →Counties We Serve
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