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Septic System Installation in Union, MO

42 license-verified pros offer septic system installation in the Union area. Typical cost: $3,600 to $12,500, averaging about $8,027.

  • Checked against Missouri licensing records
  • Verification date on every listing
  • Closed businesses auto-removed

A new system is permitted work. The installer must be licensed, and in most counties a soil evaluation and permit come before any digging.

Septic System Installation pros serving Union

Septic Services Inc

70/100
✓ MO License Verified #30097 ★ 4.8 (98 reviews) Septic Tank PumpingSeptic System InstallationSeptic RepairAerobic System Service

under 1 mile from Union

Call (636) 583-5564 Details Website

Verified Oct 2026 · Unclaimed listing

Chapman Contracting

60/100
✓ MO License Verified #32521 ★ 4.2 (5 reviews) Septic Tank PumpingSeptic System InstallationSeptic RepairAerobic System Service

Saint Clair, MO · 7 mi from Union

Call (636) 629-7854 Details

Verified Oct 2026 · Unclaimed listing

Show Me Soils

70/100
⚠ MO registration lapsed ★ 4.9 (323 reviews) Septic Tank PumpingSeptic System InstallationSeptic RepairAerobic System Service

Lonedell, MO · 13 mi from Union

Call (636) 629-1788 Details Website

Verified Oct 2026 · Unclaimed listing

Looking for other work? See all septic services in Union.

What septic system installation costs

ServiceTypical rangeNational average
Septic System Installation $3,600 to $12,500 ~$8,027

Source: realestate.usnews.com. National ranges. Rural Missouri markets often land mid-range. Full cost guide →

Septic System Installation questions

Do I need a permit?

Yes. Every county here requires a construction permit and, in most cases, a soil or perc evaluation first. See our permit requirements pages by county.

How long does installation take?

Typical residential installs run 1 to 3 days of on-site work once permits are approved; the permit and evaluation stage usually takes longer than the digging.

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