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Septic System Installation in St. Charles, MO

35 license-verified pros offer septic system installation in the St. Charles 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 St. Charles

Bi-State Utilities Co.

60/100
✓ MO License Verified #33719 ★ 3.7 (6 reviews) Septic System InstallationSeptic RepairAerobic System Service

St. Charles, MO · 5 mi from St. Charles

Call (314) 209-0202 Details

Verified Oct 2026 · Unclaimed listing

Mr. Rooter

70/100
✓ MO License Verified #39419 ★ 4.8 (2276 reviews) Septic Tank PumpingSeptic System InstallationSeptic Repair

Fenton, MO · 18 mi from St. Charles

Call (314) 665-2157 Details Website

Verified Oct 2026 · Unclaimed listing

Trinity Ditching LLC

70/100
⚠ MO registration lapsed ★ 4.6 (16 reviews) Septic Tank PumpingSeptic System InstallationSeptic RepairAerobic System Service

Troy, MO · 25 mi from St. Charles

Call (636) 462-2084 Details Website

Verified Oct 2026 · Unclaimed listing

M Turpin Services LLC

70/100
⚠ MO registration lapsed ★ 4.4 (28 reviews) Septic Tank PumpingSeptic System InstallationSeptic RepairAerobic System Service

Foristell, MO · 26 mi from St. Charles

Call (636) 262-6230 Details Website

Verified Oct 2026 · Unclaimed listing

Looking for other work? See all septic services in St. Charles.

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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