Flood levels and flood insurance for Vernon waterfront

Updated September 2026

Short answer: Okanagan Lake hit a record 343.25 m in June 2017. Vernon now uses newer floodplain mapping, with a lake-zone flood construction level (FCL) of 344.6 m (CGVD2013 datum, or 344.3 m in the older CGVD28 datum), and higher levels within about 40 m of shore because of waves. In Coldstream, the bylaw FCL for Kalamalka Lake is 393.2 m (CGVD28). New habitable floors must be above the FCL. Overland flood insurance is now widely available but varies by insurer.

Okanagan Lake: the key numbers

The lake normally varies by about 1.2 m through the year. The Province manages it through the Okanagan Lake Regulation System, with dams, channels and dikes, and forecasts inflows from February to May based on snowpack.

Watch the datum. Canada changed its official vertical datum from CGVD28 to CGVD2013, which moves numbers by about 0.25 to 0.3 m around the Okanagan. Always check which datum a survey, map or bylaw uses.

What Vernon requires

Vernon's Floodplain Management Bylaw 5896 (2022) and its Flood Hazard development permit area apply to properties in the mapped floodplain.

• No habitable, business or storage floor below the FCL
• No furnaces or major electrical equipment below the FCL
• Basements are prohibited, and crawl spaces are limited to 1.2 m, unless natural ground is above the FCL
• On Okanagan Lake frontage, the City may require an engineered foundation or geotechnical report, and a covenant is registered on title noting the building may be damaged by water
• Renovations with no addition, or additions of up to 25% of the footprint, are exempt from the FCL (not from setbacks)

Properties within about 40 m of the shore can have a higher shoreline-zone FCL, up to about 347 m on some of the City's map sheets. Check the parcel on the City's flood map.

Kalamalka Lake and Swan Lake

• Kalamalka: the 2017 peak was 392.45 m (CGVD28). Coldstream and the Regional District require buildings to be above 393.2 m (CGVD28), and Coldstream doesn't allow walkout basements within 60 m of a watercourse or below that level. Newer regional mapping suggests the design flood level may rise, so check whether updated maps have been adopted.
• Swan Lake: for parcels in the Regional District's electoral areas, the default FCL is 1.5 m above the natural boundary, with a 15 m floodplain setback, unless provincial mapping says otherwise. For City of Vernon parcels, check the City's flood map.

What buyers should check

1. The property's FCL on the municipal flood map, and the elevation of the main floor (a surveyor can confirm it)
2. Any covenants on title related to flooding
3. Whether the seller had flood damage, sandbagging or claims in 2017 or 2018, and what was repaired
4. Sump pumps, backup power and backwater valves
5. Whether any planned renovation would trigger the FCL or a flood hazard permit

Flood insurance

• About 94% of Canadian homes can now get overland flood insurance, and take-up has risen sharply since 2017. About 2% of homes account for more than half of potential flood losses, so coverage and price vary a lot from property to property.
• A national flood insurance program for the highest-risk households has been in the works, but no launch date had been confirmed as of mid-2026.
• Standard home policies usually don't cover dock damage from ice, waves, high water or boats. You may need a separate dock or boat policy.

Get a written insurance quote, with overland flood and sewer backup coverage, before you remove subjects.

Frequently asked questions

Sources: OBWB Okanagan Mainstem Floodplain Mapping (2020), BC Okanagan Lake Regulation System factsheet, Vernon Floodplain Management Bylaw 5896, Vernon flood mapping, Coldstream Zoning Bylaw 1838, RDNO Zoning Bylaw 3000, Insurance Bureau of Canada.