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Drain Field Replacement

A failed drain field usually requires a new field on fresh soil, sized to current code. Connect with local licensed installers for site evaluation and quotes.

  • Replacement typically $3,000–$15,000 (avg $7,900, HomeGuide)
  • Mound, drip and aerobic systems $10,000–$20,000+
  • Free quotes from licensed local installers
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Typical national cost$3,000 – $15,000Cost guide →

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About Drain Field Replacement

A failed drain field usually has to be replaced with a new field on fresh soil, sized to current code. Replacement typically costs $3,000–$15,000 (average $7,900, HomeGuide), with mound fields at $10,000–$20,000. Most jobs need a soil evaluation and a county permit before digging, and the work itself takes 3–7 days.

We connect homeowners with independent local licensed contractors for drain field replacement. The ground under your lot — clay versus sand, shallow rock versus deep soil, high water table versus dry — decides which field type you can build and what it costs. Our county pages cover the local soil conditions and permit requirements; the calculator sizes the field to your state's code.

Cross-section of one drain field trench under a lawn. Below a soil cover and a barrier fabric, a perforated pipe with its holes facing down lies in a bed of gravel. Effluent drips out of the pipe, spreads through the gravel and soaks into the soil, where a thin biomat layer forms along the trench bottom and walls. Beneath the trench, a band of unsaturated soil finishes treating the effluent above the seasonal high water table.
A field fails when biomat seals the soil around the trenches. That soil can't be pumped back to health, so the fix is usually a new field on fresh ground, sized to current code.

Common Jobs We Route

  • Full field replacement on new soil
  • Replacement with an upgraded type (mound, drip, ATU)
  • Tank + field replacement ($4,500–$20,000 HomeGuide)
  • Field relocation ($5,500–$21,500 HomeGuide)
Two cross-sections side by side. Left, a conventional drain field: gravity-fed gravel trenches dug into the native soil, with a deep layer of unsaturated soil between the trenches and the water table. Right, a mound: where the water table or bedrock is close to the surface, a gravel bed with small pressure pipes sits on a sand fill built above the ground and capped with topsoil, and a pump doses effluent into it so the sand plus the shallow native soil do the treatment.
When the soil is too wet or shallow for new trenches, the replacement has to be an engineered type, such as a mound built above the ground.

What Affects the Price

Providers quote their own work — these are the factors that consistently move the number.

  • Soil class and perc result — tight clay or shallow rock rules out conventional trenches
  • Field type required by code — conventional $2,000–$6,000 vs mound $10,000–$20,000
  • Access and excavation volume
  • Permit and design fees ($250–$2,300 envelope)
  • Landscaping and tree removal

Free Drain Field Replacement Tools

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Drain Field Size Calculator

Calculate required drain field size from bedrooms, living area, and soil type, with cost ranges for trench, chamber, mound, and spray systems.

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Cost Guides

Drain Field Replacement FAQs

How much does it cost to replace a drain field?

Typically $3,000–$15,000, average $7,900 (HomeGuide, Dec 2025). Angi puts an average job at about $7,000 (Jul 2026). Mound and engineered systems run $10,000–$20,000 or more.

How long does a drain field last?

20–25 years on average (HomeGuide). theseptic.guide says 15–30, and Angi says up to 50 with care. Pumping the tank on schedule is the single biggest factor.

Can I replace my drain field in the same spot?

Sometimes, but the old soil is usually clogged. Many codes require a designated repair or reserve area. Without one, engineered fixes can run $15,000–$50,000 (theseptic.guide).

Drain Field Replacement by Area

Drain Field Replacement in McLennan County, TXDrain Field Replacement in Bell County, TXDrain Field Replacement in Union County, NCDrain Field Replacement in Johnston County, NCDrain Field Replacement in Lake County, FLDrain Field Replacement in Hernando County, FL

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