Looking for a wetland delineation in St. Marys, IA? Describe your project once and up to three wetland consultants who work in St. Marys and Warren County get back to you with a quote. It's free and there is no obligation.
St. Marys is home to about 116 people (2024 Census Bureau estimate), a stable community (+0.9% since 2020). With 821 people per sq mi, it is a semi-rural area. Low-lying lots, stream corridors and former farmland can hold wetlands that must be mapped before building.
St. Marys at a glance
- Population (Census Bureau estimate, 2024)
- 116 (+0.9% since 2020)
- Rank in Iowa
- 795th of 940 cities and towns
- Land area
- 0.1 sq mi
- Population density
- 821 people per sq mi (semi-rural)
- Type
- City (St. Marys city)
- Main county
- Warren County
What to check before hiring in St. Marys
- Rules: in Iowa, 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 St. Marys
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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 St. Marys
How much does a wetland delineation cost in St. Marys, IA?
It depends on the size of the site, the vegetation and the report required. Describe your land: consultants who serve St. Marys 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 St. Marys 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.