Quick answer: New cesspools aren't allowed in Massachusetts, and existing ones are held to specific Title 5 failure criteria at inspection. Many don't pass. Replacing a cesspool means installing a septic tank and a soil absorption system, designed and permitted through your Board of Health.
Cesspool vs. septic system
A cesspool is a lined pit that receives all household wastewater, solids included, and lets liquid seep out. A septic system separates solids in a tank first, then disperses cleaner effluent across a designed leach field. That's why Title 5 treats cesspools more strictly.
When a cesspool has to be replaced
- It fails a Title 5 inspection, for example due to backup, breakout or frequent pumping, or because it's too close to a well or water resource.
- The Board of Health orders an upgrade.
- You're adding bedrooms or changing the use of the property.
- Local rules require it. Some towns and watersheds have stricter requirements than state Title 5.
What replacement involves
- Soil evaluation (perc test) on your lot
- System design by an engineer or registered sanitarian
- Board of Health permit
- Abandoning the old cesspool: it's pumped and filled or removed per Title 5.
- Installation of the new tank, distribution box and leach field, then a Certificate of Compliance
Small lots, high groundwater and nearby wetlands, all common around Plymouth County ponds and coastline, can require a mounded system or I/A technology, which costs more. See the cost guide.
Related guides
Frequently asked questions
Do I have to replace my cesspool when I sell?
A Title 5 inspection is required at sale. If the cesspool meets the failure criteria, it has to be upgraded, usually within two years. Buyer and seller negotiate who handles it.
Does the septic tax credit cover cesspool replacement?
Yes. The Massachusetts credit covers repair or replacement of a failed cesspool or septic system at your principal residence, subject to the credit's limits.
How long does a cesspool replacement take?
Installation itself often takes a few days. Soil testing, design and permitting usually add several weeks or more, depending on the town and season.
Last reviewed 2026-11-09. Regulations and prices change. Confirm details with your local Board of Health and your contractor.