The difference is in how you pay. With septic, there's no sewer bill, but you own the system: pumping every 3 to 5 years (EPA, March 11, 2026) (typically $292 to $565 a visit) (HomeAdvisor, June 17, 2026), inspections, and eventually repairs or replacement. With sewer, the city handles treatment and you pay a monthly bill set by your local utility. Switching from septic to sewer costs around $6,000 or more, including the new line and decommissioning the tank (HomeAdvisor, June 17, 2026).
Estimate a new septic system to compare →
| Septic | Public sewer | |
|---|---|---|
| Who maintains it | You, the owner (EPA, March 11, 2026) | Your utility treats the wastewater; ask your city which part of the line is yours |
| Ongoing cost | Pumping every 3–5 years, inspections every 1–3 (EPA) | Monthly sewer charge set by your utility |
| Big-ticket risk | Drain field or full system replacement | One-time connection costs if you switch (below) |
| How to tell which you have | A $0.00 wastewater/sewer charge, or no utility bill (EPA, March 11, 2026) | A wastewater/sewer charge on your bill |
Sewer rates vary a great deal from city to city, so compare against your own utility's published rate rather than a national average.
If a sewer main serves your street, you'll need your local authority's permission to connect. HomeAdvisor's figures (HomeAdvisor, June 17, 2026):
| Item | Typical cost (range) |
|---|---|
| Switch from septic to sewer (line + decommissioning) | around $6,000 or more |
| New sewer line, per linear foot | $50 – $250 (the same guide elsewhere says up to $300) |
| Sewer line installation, any job (normal range) | $1,423 – $5,775 |
| Permit to connect | $400 – $1,600 (about $1,000) |
| Connecting to city water and sewer | $500 – $20,000, set locally |
| Decommissioning the septic tank (flush and fill) | $500 – $1,000 |
HomeAdvisor says the $6,000 figure includes laying and connecting the new line and decommissioning the tank, and that city connection fees often don't include line installation. Check whether your city's fee is on top. For decommissioning, most pros recommend flushing out the tank and filling it with a stable material like sand; it can also be removed (HomeAdvisor, June 17, 2026). Rules on abandoned tanks are local. EPA says you may be required to remove the tank, while other rules allow abandoning it in place where there's little potential for environmental, health or safety impacts (EPA, March 11, 2026). Ask your city whether it subsidizes connections; HomeAdvisor notes some do (HomeAdvisor, June 17, 2026).
If your septic system is young and healthy, switching trades pumping, inspections and repair risk for your utility's monthly sewer charge, plus the one-time connection cost. If it's old or failing, compare the connection quote with a drain field replacement, which HomeAdvisor puts at around $7,000 (HomeAdvisor, June 20, 2026) (see drain field cost). Get both quotes before deciding.
The calculator gives an itemized installed-cost estimate for your bedrooms, system type, soil and state.
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