Floodplains and Flood Insurance: Buying Near the Fraser and the Coast

Large parts of the Lower Mainland and the Fraser Valley sit on floodplains, protected by dikes along the Fraser River and the coast. Here is where the flood risk comes from, how to check a property before you buy, and what insurance and government help will and won't cover.

The short version

Where flooding comes from

• The Fraser River freshet. Melting snow raises rivers every spring and early summer, typically in May and June. The Fraser's largest flood on record came in 1894, and the City of Chilliwack estimates it as a 1 in 500 year event.
• Coastal storms. Wind and air pressure can push seawater onto shore. PreparedBC notes that coastal flooding can happen at any time of year, and can be especially damaging in winter.
• Heavy rain on rivers and creeks. After an atmospheric river in November 2021, the Nooksack River overflowed and breached its dike, and the water flooded Abbotsford's Sumas Prairie. More than 3,300 people had to leave their homes. In December 2025, flooding put 485 Abbotsford properties under evacuation order again.
• Sea level rise. Since January 2018, the Province's flood hazard guidelines, which local governments must consider, allow for sea level rise of 0.5 m by 2050, 1 m by 2100 and 2 m by 2200 when setting building elevations and setbacks on the coast.

Dikes: who looks after them

BC has more than 200 regulated dikes, over 1,100 km in all, and the Lower Mainland relies on about 600 km of dikes, 400 floodboxes and 100 pump stations. A dike is generally owned, operated and maintained by a diking authority, usually a local government. The Province's Inspector of Dikes sets design and maintenance standards, approves new dikes and changes to existing ones, and audits how diking authorities manage them.

A dike lowers the risk but doesn't remove it: dikes can be breached or damaged, as the Nooksack's was in 2021. Richmond, for example, sits at an average of about 1 m above sea level in the Fraser River floodplain, protected by 49 km of dikes and 39 drainage pump stations, and the City is raising its dikes from 3.5 m to 4.7 m to stay ahead of sea level rise.

How to check a property before you buy

• Floodplain maps. Ask the city for its floodplain map, and look the area up in the Province's Flood Study Explorer on ClimateReadyBC, which includes older maps from provincial and federal-provincial programs that ran from 1974 to 2003. The Province warns that not every community has been mapped and that flood risk can exist where there is no map, so ask the local government for its most up-to-date information.
• The flood construction level. This is the minimum height for the floor of living space in a floodplain. Under the provincial guidelines, it is the designated flood level, generally the 200-year flood, plus a safety margin called freeboard. Local governments can set it by bylaw, as Chilliwack does in its floodplain bylaw. Ask whether the home's living space sits above it: in Port Coquitlam, for example, habitable rooms aren't permitted below the flood construction level on floodplain properties.
• Covenants on title. When land that may flood is subdivided or built on, the approving officer or the building inspector can require a covenant under section 219 of the Land Title Act. The Province recommends that it require floodproofing and include a waiver of liability in favour of the local government. Your lawyer or notary will see it in the title search; read the covenant itself, not just its listing.
• The seller's disclosure. If the seller completes a Property Disclosure Statement, read the answers about moisture and water problems. The form is voluntary and reflects only what the seller knows, so ask directly whether the home has ever flooded, had water in the basement or had a water damage claim.
• The inspection. A home inspector looks at the foundation, plumbing and interior where they can be seen, and a camera scope can show problems in the sewer line. I explain what inspectors check, and what they don't, in Home Inspections in BC.

What home insurance covers

• Overland flooding. Water from rivers, lakes or heavy rain that comes in over the ground typically isn't covered by a standard policy. Many insurers offer it as an optional add-on, priced on the property's risk.
• Sewer backup. Water backing up through sewers and drains is typically covered only if you buy sewer backup coverage, another optional add-on.
• Groundwater and seepage. These are typically not standard, and only some insurers offer them as endorsements.
• Coastal flooding. Flood add-ons are generally written for fresh water overflowing onto land. In 2022, a federal task force found that coastal storm surge coverage remained limited, so near the ocean, ask specifically about storm surge.

In the highest-risk areas, flood coverage can be very expensive or not offered at all. The same task force found that for high-risk homes, flood insurance can be cost-prohibitive, if it is available at all, and that 90% of the financial flood risk for Canadian homes sits with the 10% at highest risk. Ask an insurance broker for a quote with the coverage you need before you remove subjects, including the limits and deductibles.

In a condo or townhouse, the strata generally insures the buildings shown on the strata plan, but overland flood coverage isn't required for a strata, so check the strata's insurance summary for flood coverage and its deductibles. I explain how strata deductibles and your own policy fit together in Condo Insurance in BC.

Disaster Financial Assistance

When the Province approves an event for Disaster Financial Assistance, homeowners and tenants can apply for help with uninsurable losses to their principal residence, such as building repairs, essential belongings and clean-up. It pays 80% of the eligible damage above the first $1,000, up to $400,000 a claim. On $50,000 of eligible damage, for example, that works out to $39,200. Applications are due within 90 days of the event being declared eligible.

• Insurable damage isn't covered. The Province lists sewer or sump backup, earthquakes, wildfires, snow load and wind storms among the damage DFA won't pay for. PreparedBC adds that DFA isn't available if you could have bought insurance and didn't, so where flood coverage is offered for a home, DFA is no substitute for it. Homeowners must include an insurance form completed by their broker.
• Some homes and items are left out. Seasonal or recreational properties aren't eligible, a rented suite doesn't count as part of your principal residence, and insurance deductibles, landscaping and land lost to erosion aren't covered.

Is there national flood insurance?

Not yet. The federal government has committed to a low-cost national flood insurance program for homes at high risk, and a federal task force analysed the options in 2022. As of July 2026, it had not launched. Public Safety Canada's plan for 2026 to 2027, released in March 2026, still described it as in development, and in April 2026 the federal emergency management minister said she couldn't commit to launching it in the near future. Until it exists, flood coverage comes from private insurers, so check what is available for a property before you commit.

Protecting a home you buy

• Backwater valve. Install one if your municipality recommends it, and ask whether it offers a subsidy or has its own requirements.
• Sump pump. Choose one with a battery backup.
• Drainage. Extend downspouts at least 1.8 m (six feet) from the basement wall, and keep the ground sloping away from the house.
• Belongings. Avoid keeping valuable items in the basement.
• Warnings. Watch the River Forecast Centre's flood warnings and advisories during high water, and keep a household plan and emergency kit ready, as PreparedBC suggests.

Questions buyers often ask me

How do I find out if a home is in a floodplain?

Ask the city for its floodplain map and check the Province's Flood Study Explorer. Not every area has been mapped, and an unmapped area can still flood, so ask about the home's history too.

Does home insurance cover flooding in BC?

Not a standard policy. Overland flood and sewer backup coverage are optional add-ons, and in high-risk areas flood coverage can be costly or unavailable, so get a quote before you remove subjects.

Is a home behind a dike safe from flooding?

Safer, but not risk-free. Dikes lower the risk but can be breached or damaged, and much of Richmond, for example, is floodplain behind its dikes, so check the floodplain map and the flood construction level either way.

What does Disaster Financial Assistance cover?

Uninsurable losses to your principal residence after an event the Province approves: 80% of eligible damage above $1,000, up to $400,000 a claim. It doesn't cover damage you could have insured, such as sewer backup, or flood damage if flood coverage was available and you didn't buy it.

Is there a national flood insurance program in Canada?

Not as of July 2026. The federal government has been developing a low-cost program for high-risk homes, but it hadn't launched, so flood coverage still comes from private insurers.

Buying near the river or the coast? Read what your inspector checks and how condo insurance works, or browse homes for sale in Richmond.

This article is general information, not legal or insurance advice. The details come from the Province, municipal websites, Public Safety Canada and the Insurance Bureau of Canada, and were current at the time of writing; talk to a licensed insurance broker about your own coverage. For the Province's guide, see floodplain mapping in BC.