Home Insurance

I Thought I Didn't Need Flood Insurance — Then My Basement Filled With Water

By Marcus Tiernan · November 5, 2025 · Denver, Colorado

I Thought I Didn't Need Flood Insurance — Then My Basement Filled With Water

When I bought my house in Westminster in 2015, my lender didn't require flood insurance. The house wasn't in a FEMA flood zone. The seller's disclosure didn't mention any flooding history. My home inspector said the grading was good and the basement was dry. So I skipped flood insurance. Saved myself $450 a year. Felt pretty smart about it.

Then came the storm of September 2024.

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It wasn't even a hurricane or tropical storm. Just a regular Colorado thunderstorm that parked itself over the Denver metro area for 6 hours. We got 4.3 inches of rain in one afternoon. The average for September is 1.2 inches. This was nearly 4x the monthly average in 6 hours.

My basement flooded. Not a little water. Not a damp corner. Two feet of water. Enough to destroy the water heater, the furnace, the washer and dryer, and everything I had stored down there. Boxes of photos from my kids' childhoods. My wife's grandmother's furniture. My home office setup. All of it, underwater.

I called my insurance company the next morning. "I need to file a claim for flood damage."

"Do you have flood insurance?" the agent asked.

"No, but I have comprehensive home coverage."

"Comprehensive doesn't cover flooding. Flooding is a separate peril. Without a flood policy, there's no coverage."

I argued. I pleaded. I explained that this wasn't a "flood" in the traditional sense — it was just a lot of rain. The agent was polite but firm. "If water comes from above, it's usually covered. If water comes from below or from the ground, it's flood. Your policy specifically excludes flood damage."

I pulled out my policy. Page 9, section C: "We do not cover loss caused by flood, surface water, waves, tidal water, overflow of a body of water, or spray from any of these, whether or not driven by wind."

My damage: $47,000. My insurance payout: $0.

I spent the next 6 months paying for repairs out of pocket. New furnace: $6,800. New water heater: $1,200. New washer and dryer: $1,400. Mold remediation: $8,500. New drywall and flooring: $12,000. Replacing everything that was destroyed: $17,000. I did a lot of the work myself to save money. My wife and I spent every weekend for three months down in that basement, tearing out drywall, scrubbing mold, installing new flooring. It was miserable.

And here's the kicker: after the flood, I checked FEMA's flood map again. My house still wasn't in a flood zone. The flood that destroyed my basement was a "1,000-year storm" — statistically unlikely, but physically possible. FEMA maps are based on historical data and river flooding. They don't account for urban flash flooding caused by overwhelmed storm drains. In a city like Denver, where development has increased runoff and aging infrastructure can't handle intense rainfall, flash flooding is becoming more common even in "safe" areas.

I bought flood insurance after the repairs were done. It costs me $520 a year now. My wife asked if it was worth it since we already had our "once in a lifetime" flood. I told her the same thing I tell my clients: weather patterns are changing. What was a 1,000-year storm in 2024 might be a 100-year storm in 2034. The math is shifting. And I'd rather pay $520 a year than $47,000 again.

Here's what most homeowners don't understand about flood insurance:

First, your standard home policy does not cover flooding. Not a little. Not at all. Zero. If water comes from the ground up, you're not covered unless you have a separate flood policy. This surprises people because "comprehensive" sounds like it covers everything. It doesn't.

Second, flood insurance through the National Flood Insurance Program (NFIP) has a 30-day waiting period. You can't buy it today and file a claim tomorrow. You have to plan ahead. If you wait until the storm is forecast, it's too late.

Third, NFIP coverage is limited. It covers up to $250,000 for the building and $100,000 for contents. If your house is worth more than that, you need excess flood coverage from a private insurer. Most people don't know this and find out too late.

Fourth, flood maps are outdated. FEMA updates them every 5-10 years, but weather patterns change faster than that. Just because your house isn't in a flood zone today doesn't mean it won't flood tomorrow. In the 2013 Colorado floods, 75% of damaged homes were outside designated flood zones.

I tell every client the same thing now: if you have a basement, get flood insurance. Even if you're not in a flood zone. Even if your lender doesn't require it. Even if it feels like a waste of money. Because the one time you need it, it's not a waste. It's a lifesaver.

— Marcus, Denver

Marcus Tiernan

Marcus Tiernan

Independent insurance broker in Denver. Former claims adjuster. I help families find coverage that actually pays out when disaster strikes. Read more →