Flood Zones: Redmond vs Renton
How do flood zones rules compare between Redmond, WA and Renton, WA?
Redmond and Renton have similar restriction levels.
Redmond, WA
King County
Redmond participates in the NFIP and regulates construction in FEMA Special Flood Hazard Areas along Bear Creek, Evans Creek, and the Sammamish River. Critical areas code adds 1-2 ft freeboard.
View full Redmond rules →Renton, WA
King County
Renton participates in the NFIP and enforces RMC 4-3-050 floodplain regulations in FEMA Zone AE along the Cedar River and Black River. New construction in the floodplain must meet elevation and floodproofing standards.
View full Renton rules →Key Facts Comparison
| Fact | Redmond | Renton |
|---|---|---|
| Program | NFIP participant | - |
| Main floodplains | Bear Creek and Sammamish River | - |
| Freeboard | 1-2 ft above BFE | - |
| Substantial improvement | 50% rule applies | - |
| Authority | - | NFIP and RMC 4-3-050 |
| Main flood zones | - | Cedar River, Black River corridor |
| Elevation requirement | - | 1 foot above BFE freeboard |
| Floodplain permit | - | Required for fill, development |
| Insurance | - | Required for federal mortgages in SFHA |
Highlighted rows indicate differences between cities.
Redmond FAQ
Is my Redmond property in a flood zone?
Properties along the Sammamish River, Bear Creek, and Evans Creek may be in a FEMA SFHA; check the FIRM or call Redmond Planning.
Do I need flood insurance in Redmond?
Mortgage lenders require it for any federally backed loan on property inside a Special Flood Hazard Area; outside the SFHA it is optional.
Renton FAQ
How do I find out if my property is in a Renton flood zone?
Check the FEMA Flood Map Service Center at msc.fema.gov or contact Renton CED for a determination and map review.
Can I build an addition in the floodplain?
Yes, but it must be permitted as floodplain development, meet elevation and compensatory storage rules, and may be restricted if it constitutes a substantial improvement.
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