Wetlands
Wetlands are protected areas with unique environmental value. Learn how wetlands regulations affect land development and property rights.
Definition
Wetlands are areas of land saturated with water, either permanently or seasonally, creating distinct ecosystems with vegetation adapted to wet conditions. Examples include marshes, swamps, and bogs. Wetlands provide critical habitat for wildlife, improve water quality, and mitigate flooding. Because of their environmental importance, wetlands are protected by federal, state, and local regulations. Property owners must obtain permits before dredging, filling, or developing wetlands, and they may be required to mitigate impacts by restoring or preserving other wetland areas. Buyers should conduct wetlands assessments to determine development restrictions and ensure compliance with environmental laws.
Why It Matters
A wetland brings a buffer with it, and the buffer is where the building restriction actually bites. Washington counties sort wetlands into categories with buffers ranging from about 25 feet to over 200, so a half acre lot can end up with almost no legal building envelope. Filling one without permits invites Ecology and Army Corps enforcement, restoration orders and penalties far exceeding the cost of a delineation.
Examples
A buyer under contract on 2.4 acres near Snohomish orders a delineation and learns a Category II wetland with a 150 foot buffer sits across the intended house site.
An owner clears blackberries and grades a soggy back corner, a neighbor complains, and the county issues a critical areas violation requiring a mitigation planting plan.
An unmapped seasonal wetland comes to light during listing, and the lot appraises roughly $80,000 under comparable buildable parcels once the restriction is disclosed.
Tips
Treat the National Wetlands Inventory map as a hint rather than an answer, and hire a wetland biologist for an on site delineation during your feasibility period.
Request the parcel's critical areas designation and buffer width from the county planning department in writing before you release a feasibility contingency.
If a wetland is confirmed, price the mitigation plan, permitting and multi-year monitoring into your offer; that package routinely runs five figures and adds six months to a build.
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