Looking for a wetland delineation in Union Gap, WA? Describe your project once and up to three wetland consultants who work in Union Gap and Yakima County get back to you with a quote. It's free and there is no obligation.
Union Gap is home to about 6,582 people (2024 Census Bureau estimate), a stable community (+0.2% since 2020). With 1,180 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.
Union Gap at a glance
- Population (Census Bureau estimate, 2024)
- 6,582 (+0.2% since 2020)
- Rank in Washington
- 116th of 281 cities and towns
- Land area
- 5.6 sq mi
- Population density
- 1,180 people per sq mi (suburban)
- Type
- City (Union Gap city)
- Main county
- Yakima County
What to check before hiring in Union Gap
- 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 Union Gap
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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 Union Gap
How much does a wetland delineation cost in Union Gap, WA?
It depends on the size of the site, the vegetation and the report required. Describe your land: consultants who serve Union Gap 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 Union Gap 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.