Mountain View, CA Environmental Rules: Flood Elevation Requirements (2026)
Key Facts
- Certifier required
- CA-licensed land surveyor or civil engineer
- Certification points
- At lowest-floor placement and before final inspection
- Below-BFE construction
- Allowed only via rare variance
- Insurance premium warning
- Up to $25 per $100 of coverage
- Variance decision body
- City Council
Summary
Mountain View treats building below the base flood elevation as an exception, not a default: it takes a rare variance to do it, and the floodplain administrator must warn the owner in writing that going below code elevation can push federal flood insurance premiums as high as $25 per $100 of coverage.
e.When the request is to allow construction of the lowest floor of a new building or substantial improvement of a building below the base flood elevation, notification to the applicant in writing and signed by the floodplain administrator specifying the difference between the base flood elevation and the proposed elevation of the lowest floor, stating that issuance of a variance to construct below the elevation required in the building code will result in increased premium rates for federal flood insurance up to amounts as high as twenty-five dollars ($25.00) for one hundred dollars ($100.00) of insurance coverage and that such construction below the required elevation increases risks to life and property.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 34 Update 4).
Full Breakdown
Chapter 48 requires elevation compliance to be documented, not just designed on paper. 20 requires that, upon placement of the lowest floor (including any basement) and before further vertical construction proceeds, a CA-licensed land surveyor or civil engineer must certify the elevation required by the building code and submit it to the chief building official, with a second certification due before final inspection; new or substantially improved nonresidential buildings additionally need FEMA floodproofing certification before final inspection. 30). ' That notice must also flag the increased risk to life and property. 50(a)-(d)).
Violations & Fines
Constructing the lowest floor below the base flood elevation without an approved variance is a violation of Chapter 48 and a misdemeanor under Section 48.18.05. Even with a variance, failing to document the mandated elevation certification from a licensed surveyor or engineer at lowest-floor placement and at final inspection under Section 48.14.20 leaves a building presumed noncompliant under Section 48.18.05.
Frequently Asked Questions
Can I build below the base flood elevation in Mountain View?
Who has to certify my building's elevation in a flood hazard area?
What warning does the city give if I get a variance to build below base flood elevation?
Sources & Official References
Other rules in Mountain View
California rules heatmap·Compare Mountain View to another location·View the California environmental rules overview
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Flood Elevation Requirements in Nearby Cities
How other cities in Santa Clara County handle flood elevation requirements.