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Dennis Board of Health debates strict limits on ADUs, holds off on permanent flow increases until plant data
Summary
At a Jan. 22 work session the Dennis Board of Health debated draft sewer flow rules that would restrict accessory dwelling units (ADUs) and hold residential flow increases until the new plant’s actual usage is known; staff will revise regulations for further review in March.
The Dennis Board of Health on Jan. 22 reviewed draft wastewater regulations that would restrict increases in residential sewer flow and require accessory dwelling units to meet local bylaws, approved floor plans and owner‑occupancy requirements.
Board member Diane Chamberlain pushed to put ADU rules into the Board of Health (BOH) regulations in addition to the town’s ADU bylaw, saying ADUs should “comply with all Zoning and Town Bylaws, meet regulations for human habitation” and be owner‑occupied rather than rented. Health Director Kristen Keller noted a central technical question: whether the initial design had used 440 gallons per day (GPD) or 330 GPD as the basis for allocation.
The discussion centered on how to allocate limited sewer capacity while the new wastewater plant is completed and starts operating. Robert Duffy and Vice Chairman Bunce said a moratorium on residential flow increases is likely needed until the town knows how much flow the system will carry in practice. Town Planner Paul Foley said the town has operated under the same permitted pumping limit since 2010 and that the limit was exceeded only once, in 2020; he warned that if flows continue to rise the town may need higher rates and stronger conservation measures.
“Until we know what the actual flow will be, we have to be careful,” Vice Chairman Bunce said, noting that water‑use data can only provide a ballpark estimate of real sewer flow. Wastewater Superintendent Richard (Val) Peter reminded the board that construction is expected to finish in late 2028 and property owners would have one year (or 90 days if conditioned) to connect once the system is available.
Board members debated several enforcement and drafting issues for the regulation package: adding administrative orders and fines for violations, how to address unauthorized connections, and clarifying appeals procedures (including judicial remedies). The draft references I/A systems and the board noted its maintenance requirement tied to the Certificate of Compliance is 10 years.
Members also discussed fairness between property owners who will connect to the sewer and those who remain on septic and contribute financially to the system. Chamberlain said the board should be conservative in Phase I allocations so later phases and potential economic/mixed‑use areas have capacity available.
The board asked staff to incorporate consultant (GHD) comments into the draft, to add language on monitoring and water‑use reporting, and to bring revised regulations back at a March work session. After that review, the regulations will go to Town Council and then to the Select Board for additional consideration.
The draft regulation details discussed at the session did not include final vote counts or binding policy changes; the board scheduled further drafting and review.
