Septic or sewer, and why it decides how many homes fit

Ask a developer the first thing they check on a piece of land, and most will say sewer.

With public sewer

Lots can be small, often a quarter acre or less, and townhomes become possible. A 20-acre tract might hold 60 homes or more, depending on zoning.

Without sewer

Every home needs its own septic system. The county health department tests the soil on each lot and decides whether a system can go there and how big the drain field must be. Lots typically need to be half an acre to an acre or more. The same 20 acres might hold 12 to 20 homes.

What decides septic suitability

• Soil type. Heavy clay drains slowly; sandy loam drains well.
• Depth to rock and water. Shallow rock or a high water table rules ground out.
• Slope. Steep ground limits where a drain field can go.

Can sewer be extended?

Sometimes. If a line is close, a developer may pay to extend it, and the cost is shared across the lots. If the nearest line is miles away or the plant has no capacity, the land stays on septic. We check both before making an offer.