Drain Field Repair Cost Guides
Real price ranges built from published industry data, with the line items and local factors that move the number. Every guide lists its sources and when it was last reviewed.
Drain Field Replacement Cost (2026)
$3,000–$15,000
Typical national range · reviewed 2026-10
Replacing a septic drain field typically costs $3,000 to $15,000, and the average is about $7,900 (HomeGuide, Dec 2025). Conventional gravel fields sit at the low end. Mound, drip and aerobic systems needed on clay, shallow rock or high-water-table lots run $7,000–$20,000 or more for the field, and $10,000–$40,000+ when a treatment unit is added. Budget separately for a soil test ($600–$2,000) and permits ($250–$2,300).
Read the cost guide →Perc Test Cost (2026) and What It Tells You
$600–$2,000
Typical national range · reviewed 2026-10
A percolation (perc) or soil test typically costs $600 to $2,000 (HomeGuide), and Angi puts the average at about $1,300. System design or engineering adds $500 to $1,500 (theseptic.guide), with soil engineers at $700 to $2,000 (HomeAdvisor). The test comes before the permit and the design, because its result decides what kind of drain field your lot can have.
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