Service areas
Septic and Title 5 in Dennis and Harwich, MA
These two mid-Cape neighbors share a lot: bayside and southside villages, aging systems, and the same Title 5 process. Here is how it works in each, and how we connect you with a local contractor.
Dennis and Harwich sit side by side across the middle of the Cape, from Dennis Port and West Dennis on the south shore up to the bay, and from Harwich Port to East Harwich and Pleasant Lake. They share a housing profile heavy on seasonal and older homes, which means plenty of septic systems reaching the point where a sale forces the Title 5 question.
Two towns, one process, a few local wrinkles
The Title 5 process is the same in both: a Title 5 inspection at sale by a MassDEP-approved System Inspector, and an upgrade if the system fails. Harwich adds a useful local touch, its Health Department keeps a list of Title 5 inspectors approved by the town Board of Health. Harwich also sits partly within the Pleasant Bay watershed, a nitrogen-sensitive estuary shared with neighboring towns, so some projects there lean toward a nitrogen-reducing I/A system. The countywide five-year I/A mandate is paused as of July 2026, per the nitrogen rules guide.
Dennis permitting
Your local approving authority
- Office
- Dennis Health Department
- Address
- 685 Route 134, South Dennis, MA 02660
- Phone
- (508) 760-6158
Permits septic work and receives Title 5 inspection reports for Dennis, and issues the Certificate of Compliance.
Dennis Health DepartmentHarwich permitting
Your local approving authority
- Office
- Harwich Health Department
- Address
- 732 Main Street, Harwich, MA 02645
- Phone
- (508) 430-7509
Permits septic work for Harwich and keeps a list of Board-of-Health-approved Title 5 inspectors alongside the state list.
Harwich Septic Systems and Title 5What we connect you with in Dennis and Harwich
At no cost, we match you with an independent licensed local contractor for a Title 5 inspection, a replacement, a leach field replacement, or help after a failed inspection. The Title 5 guide explains the whole thing. Nearby, we also cover Yarmouth and Barnstable.
Verify your septic contractor
Massachusetts does not keep one central license for septic contractors. A Title 5 inspection may be performed only by a currently MassDEP-approved System Inspector, and system installation is permitted town by town through your local board of health. That makes the official records the place to confirm anyone you hire, so check them yourself before you sign. Every contractor we connect you with is asked to hold the right approvals, and you can verify any name against the public lists below.
Three questions to ask before you hire
- For a Title 5 inspection, are you a currently MassDEP-approved System Inspector?
- Will you pull the Disposal System Construction Permit from our town board of health and handle the local sign-offs?
- Can you show current liability insurance and a written, itemized estimate before any work starts?
Dennis and Harwich septic questions
Does the Harwich Board of Health keep a list of Title 5 inspectors?
Yes. The Harwich Health Department maintains a list of Title 5 system inspectors approved by its Board of Health, alongside the statewide approved-inspector list. Either way, any inspector you use has to be a currently MassDEP-approved System Inspector.
Where do I permit septic work, Dennis or Harwich?
Whichever town your property is in. The Dennis Health Department on Route 134 and the Harwich Health Department on Main Street each permit septic work, receive inspection reports, and issue the Certificate of Compliance for their own town.
Do I need a nitrogen-reducing system in Dennis or Harwich?
The countywide five-year I/A mandate is paused as of July 2026, since both towns filed watershed permit paperwork by July 2025. Harwich sits partly in the Pleasant Bay watershed, a nitrogen-sensitive system shared with neighboring towns, so some projects there still point toward I/A. An engineer evaluates the specific lot.
What does a septic replacement cost in Dennis or Harwich?
A conventional replacement runs about $25,000 to $45,000 and an I/A system about $25,000 to $35,000 in both towns, before the Massachusetts Title 5 tax credit and Barnstable County AquiFund financing. The money-programs guide walks the math.
Get matched with a mid-Cape contractor
Tell us where your property is and where you are in the Title 5 process. We connect you with an independent licensed local septic contractor for a free, no-obligation consultation and quote.
Monday to Friday, 8 AM to 5 PM Eastern