How much does a new septic system cost?
New septic system installation runs $4,500 for a basic small conventional system, $12,000 for a typical 1,000-gallon tank with leach field, and $30,000+ for engineered, mound, or aerobic treatment systems.
Quick price points (2026)
| Tier | Cost | Unit |
|---|---|---|
| Low | $4,500 | per system |
| Typical | $12,000 | per system |
| High | $30,000 | per system |