Looking for a wetland delineation in Cosmopolis, WA? Describe your project once and up to three wetland consultants who work in Cosmopolis and Grays Harbor County get back to you with a quote. It's free and there is no obligation.
Cosmopolis is home to about 1,663 people (2024 Census Bureau estimate), a growing community (+2.0% since 2020). With 1,195 people per sq mi, it is a suburban area. Low-lying lots, stream corridors and former farmland can hold wetlands that must be mapped before building.
Cosmopolis at a glance
- Population (Census Bureau estimate, 2024)
- 1,663 (+2.0% since 2020)
- Rank in Washington
- 181st of 281 cities and towns
- Land area
- 1.4 sq mi
- Population density
- 1,195 people per sq mi (suburban)
- Type
- City (Cosmopolis city)
- Main county
- Grays Harbor County
What to check before hiring in Cosmopolis
- Rules: in Washington, wetlands can be regulated by the Corps of Engineers, the state and the county, each with its own rules and buffers.
- Season: some indicators are only reliable in the growing season; ask the consultant when to schedule.
- Survey: the delineated boundary is usually located by a land surveyor for the site plan.
- Price drivers: site size, vegetation, access and whether permitting is included.
Useful official resources
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EPA: Section 404
The federal wetland permit program.
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U.S. Army Corps of Engineers
Regulatory program and district offices.
Services available in Cosmopolis
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Wetland delineation
Field delineation of wetland boundaries following the Corps of Engineers manual, with flags and a report.
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Wetland permitting support
Jurisdictional determination and permit application (Section 404, state or local) for work near wetlands.
Frequently asked questions in Cosmopolis
How much does a wetland delineation cost in Cosmopolis, WA?
It depends on the size of the site, the vegetation and the report required. Describe your land: consultants who serve Cosmopolis send a proposal.
How long does it take?
Field work often takes a day or two; agency review of a jurisdictional determination can take months.
Can I build if there is a wetland?
Often yes, by avoiding it or obtaining the required permits and mitigation.
Which wetland consultants will contact me?
Up to three independent wetland consultants who serve Cosmopolis and the surrounding area, chosen for the service you need. Your details are shared only with your consent.
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2024) and Gazetteer Files (public domain), imported on 10/31/2026. Figures describe the incorporated place or county as published; they are shown for information only.