Conservation
Outdated Data, Modern Storms: The Case for Stronger Local Wetlands Rules
While state regulations still lean on decades-old rainfall models, local bylaws give communities the tools to prepare for real-world storms and rising tides.
Importance of Wetland Bylaws: MACC Fact Sheet Authority for Local Wetland Bylaws
Article 89 (Home Rule) of the Massachusetts Constitution and G.L. c. 40
Why protect wetlands, streams, rivers, ponds, and the floodplain?
Swamps, salt marshes, bogs, vernal pools, ponds, streams, rivers, lakes, and the floodplain – collectively referred to as wetlands – have many functions valued by society such as improving water quality, protecting water supplies, reducing flooding, and preventing storm damage.
Why do we need local wetland bylaws and ordinances?
Local wetlands bylaws:
• Provide municipalities with authority to address gaps in state-level protection, such as evaluating stormwater impacts using contemporary rainfall data instead of the 1960’s data used in current (2026) state wetland regulations.
• Provide additional buffer zone, floodplain and isolated wetland protections to better protect residents from flooding and protect structures from damage.
• Provide clarity for applicants in areas where the Wetland Protection Act is vague or often misunderstood. Wetland Bylaws Protect Sensitive Areas Not Covered by State Law and Regulations
• Wetland bylaws expand conservation commission jurisdiction to protect the functions of isolated wetlands, vernal pools, and adjoining upland/buffer zones that are not protected in state regulations. These wetlands can provide additional flood storage, ground water recharge, and critical wildlife habitat.
• Municipalities vary greatly in their number, size, and types of Wetland Resource Areas (e.g. perennial and intermittent streams, vernal pools, floodplains, Estimated Habitat of Rare and Endangered Species, coastal resources, etc.). Local wetland bylaws enable important protections that are unique to the municipality.
• Wetland bylaws authorize conservation commissions to adopt local regulations to implement the bylaws, codify policies, and clarify permit and hearing procedures.
• Wetland bylaws establish structure or disturbance setbacks to discourage development right up to the edge of wetland resource areas.Wetland Bylaws Protect Municipalities from Climate Change Impact
• Local wetland bylaws provide increased flood storage in wetlands and open spaces which protect municipalities and their residents from impacts of climate change and severe rainfall/storm events.
• Local wetland bylaws establish performance standards for coastal resource areas that are missing from the state wetland protection regulations including Land Subject to Coastal Storm Flowage.
• In 2026, state wetland protection regulations use rainfall data from the 1960’s and the regulations have not been updated in a timely manner. Up-to-date rainfall calculations are critical to plan for stormwater runoff caused by increasingly severe storms due to climate change. Many municipalities use local wetland bylaws with updated rainfall data to protect buildings, infrastructure, and residents from the impacts of climate change.
• Local wetland bylaws often are connected with ensuring the community’s compliance with other federal or state requirements such as the EPA “MS4” stormwater permit, FEMA floodplain protections, or DEP water supply protection provisions.