When clearing near wetlands, streams or shorelands, a map line is not a work boundary, and every agency involved says so in its own words. In Vermont, most mapped wetlands are Class II and carry a 50-foot buffer, and removing vegetation inside the wetland or that buffer needs a Vermont Wetland Permit unless it is an Allowed Use under Section 6 of the rules. In New York, DEC regulates freshwater wetlands over 12.4 acres plus a 100-foot adjacent area, with the threshold dropping to 7.4 acres on 1 January 2028, and DEC states plainly that its maps are not a final determination.
In New Hampshire, RSA 482-A governs wetland impacts and RSA 483-B adds protected shoreland within 250 feet of the reference line of public waters, including fourth-order and greater streams. The practical rule is the same in all three: get the boundary determined, mark it on the ground, and keep mulch, soil, fuel and machine tracks on the upland side of it.
The short answer
Online maps are screening tools, not permission. Confirm jurisdiction and site conditions before disturbance.
| State | Wetland trigger | Buffer or adjacent area | Authority |
|---|---|---|---|
| Vermont | Class I and Class II mapped wetlands | 50 ft (Class II) | VT DEC Wetlands Program |
| Vermont shoreland | Lakes over 10 acres | 250 ft from mean water level | VT DEC Lakes and Ponds |
| New York | Over 12.4 acres; 7.4 acres from 1 Jan 2028 | 100 ft adjacent area | NYS DEC |
| New Hampshire | Jurisdictional areas under RSA 482-A | Per Env-Wt rules | NH DES Wetlands Bureau |
| NH shoreland | Public waters and 4th-order+ streams | 250 ft from reference line | NH DES |
Screen the parcel before disturbance
Do not use a map line as the work boundary. Request the jurisdictional review or field delineation the project needs, mark the stable upland access, and keep mulch, soil, fueling, rutting, and material storage out of places where they can reach water.
The sequence, in order
- Screen the parcel on the state mapping tool: as a question list, not an answer.
- Request the jurisdictional review or field delineation the project needs.
- Mark the determined boundary on the ground and photograph the marks.
- Establish stable upland access and staging outside the line.
- Keep mulch, soil, fuelling and machine tracks upland of it.
- Stabilise anything disturbed before the next rain.
What goes wrong
- Using a mapped boundary as the work limit.
- Assuming a dry summer means not a wetland.
- Fuelling or servicing a machine near the line.
- Assuming a Vermont answer applies in New York or New Hampshire.
What DEC and the Vermont statute say about wetland buffers and clearing
The statute that sets the buffer is short. Vermont's wetland law, 10 V.S.A. chapter 37, says the buffer zone for a Class II wetland extends at least 50 feet from its border. The Secretary can set a wider width for a particular wetland.
The town of Hartford's wetlands explainer states the consequence. Activity in a state-protected wetland or its 50-foot buffer is prohibited unless it is exempt, an allowed use under the Vermont Wetland Rules, or authorized by a permit. A project near a wetland will likely need a delineation by a professional.
DEC's Vermont Wetland Rules page shows the protected list is still changing. The 2023 revision moved from a presumptive to a categorical Class II list and added two Class I wetlands. For Act 250 projects, the ANR wetlands criterion asks for a delineation no more than five years old. An older delineation on a lot bought for development may need to be redone before the clearing scope is priced.