Elevation Certificates in Thurston County, WA
An elevation certificate documents the elevation of a structure relative to the Base Flood Elevation (BFE) established by FEMA for that location. It is used by flood insurance companies to set premiums, by lenders to confirm flood insurance compliance, and by local floodplain administrators to verify that structures meet floodplain development standards. If you own property in a flood-mapped area of Thurston County, you will likely need one at some point in the ownership cycle.
Thurston County has a diverse set of flood risk areas. The combination of Budd Inlet tidal influence, the Deschutes River watershed, Capitol Lake, and the Black River corridor in the western part of the county means that flood zone questions arise across a wide geography, from urban Olympia to rural western Thurston County.
Thurston County Flood Zones
Deschutes River Corridor
The Deschutes River flows north through Tumwater and into Olympia before entering Capitol Lake. The flood corridor along this river affects properties in both cities. Low-lying areas near the river in Tumwater, including neighborhoods close to Tumwater Falls Park, fall within mapped FEMA flood zones. Property owners in these areas regularly need elevation certificates for insurance or permit purposes.
Budd Inlet and Capitol Lake
Budd Inlet is the southernmost reach of Puget Sound, and Olympia sits directly on its shore. Tidal influence extends into Capitol Lake and the lower Deschutes estuary. Properties near the Olympia waterfront and the Capitol Lake perimeter may have flood zone designations that reflect both riverine and coastal/tidal flooding sources. These situations can require more careful analysis than a standard riverine flood zone property.
Black River Corridor
The Black River drains the Black Hills area of western Thurston County and flows east toward the Chehalis River system. Low-lying agricultural land along the Black River and its tributaries in western Thurston County is mapped as a flood zone. Property owners in this rural area, including parcels near Grand Mound and Rochester, may face flood insurance requirements that trigger the need for an elevation certificate.
Nisqually River and Yelm Area
The Nisqually River forms part of Thurston County's eastern boundary. Low-lying areas near the river and its delta are mapped flood zones. Properties near Yelm and Rainier in the southeastern part of the county can also be affected by smaller tributary flood zones on the Nisqually drainage.
When You Need an Elevation Certificate
- Mortgage on a flood zone property: Federal law requires flood insurance for federally backed mortgages on properties in Special Flood Hazard Areas. The insurer needs an elevation certificate to calculate your premium.
- Challenging your flood zone designation: If you believe your property was incorrectly mapped as a flood zone, an elevation certificate is the starting point for submitting a Letter of Map Amendment (LOMA) to FEMA.
- Selling a flood zone property: Buyers and their lenders will require current flood insurance documentation. Having an up-to-date elevation certificate simplifies the transaction.
- Building or renovating in a flood zone: Thurston County floodplain development permits require documentation that the structure meets elevation requirements. An elevation certificate provides that documentation.
- Lowering your flood insurance premium: If your structure was built before FEMA maps were established for your area (a pre-FIRM building), an elevation certificate may allow the insurer to rate the policy based on actual elevation data rather than the default rate, which is often much higher.
How to Get an Elevation Certificate in Thurston County
Hire a Washington-licensed Professional Land Surveyor to prepare the certificate. The surveyor will visit the property, establish the elevation of the lowest floor and other required reference points using GPS survey equipment tied to NAVD 88 datum, and complete FEMA Form FF-206-FY-22-152. The completed certificate is submitted to FEMA's standard format requirements and signed and sealed by the PLS.
Before ordering, check whether a prior elevation certificate exists for your property. Some Thurston County properties, particularly those in established flood-prone subdivisions, may have certificates on file with the county floodplain administrator or from a prior real estate transaction. A valid prior certificate can save you several hundred dollars.
Cost in Thurston County
Most elevation certificates in Thurston County cost $350 to $650. Properties with tidal frontage on Budd Inlet, complex multi-source flood zones, or access challenges may run higher. Request at least two written quotes and confirm what is included: site visit, elevation data collection, FEMA form completion, and the signed/sealed certificate document.
Find a Licensed Surveyor for Your Elevation Certificate
Our directory connects you with Washington PLS-licensed surveyors serving Thurston County. Search Thurston County surveyors to find firms that handle elevation certificates in Olympia, Tumwater, Lacey, Yelm, and the surrounding county.