Looking for a wetland delineation in San Mateo, CA? Describe your project once and up to three wetland consultants who work in San Mateo and San Mateo County get back to you with a quote. It's free and there is no obligation.
San Mateo is home to about 103,006 people (2024 Census Bureau estimate), a shrinking community (−2.5% since 2020). With 8,489 people per sq mi, it is a densely built-up area. Low-lying lots, stream corridors and former farmland can hold wetlands that must be mapped before building.
San Mateo at a glance
- Population (Census Bureau estimate, 2024)
- 103,006 (−2.5% since 2020)
- Rank in California
- 71st of 482 cities and towns
- Land area
- 12 sq mi
- Population density
- 8,489 people per sq mi (densely built-up)
- Type
- City (San Mateo city)
- Main county
- San Mateo County
What to check before hiring in San Mateo
- Rules: in California, 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 San Mateo
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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 San Mateo
How much does a wetland delineation cost in San Mateo, CA?
It depends on the size of the site, the vegetation and the report required. Describe your land: consultants who serve San Mateo 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 San Mateo 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.