Each property owner is responsible for that determination and must hire a qualified wetlands professional to make such an assessment. If your project involves getting a Building Permit, you will be required to supply a letter signed and stamped by a qualified professional engineer, wetlands scientist or land surveyor stating that "no work will be done within 100 feet of wetlands or within 200 feet of a perennial stream or river."
Any work within a 100 foot Buffer Zone from wetlands or 200 feet from a perennial stream or river requires a permit from the Conservation Commission as required by state and local regulations. If there is a question as to whether your project requires such a permit, please call the Conservation Commission Office at 508-785-0032, ext. 233, for more information before you begin any work.