Residents across St. Catharines and much of Niagara experienced two unprecedented rain events within a single week, resulting in widespread basement flooding, road closures, overwhelmed storm sewers and thousands of homeowners dealing with water damage.
The first storm struck on July 28, followed by another significant rainfall on August 3, leaving many properties flooded for a second time before cleanup from the first storm had even finished. Saturated ground conditions meant the second rainfall had nowhere to go, dramatically increasing runoff and overwhelming drainage systems.
Just How Much Rain Fell?
Reports from residents and weather observers indicate portions of St. Catharines received approximately 138 mm of rain in only a few hours during the first storm.
To put that into perspective:
- The average rainfall for the entire month of July is roughly 89 mm
- More than one and a half months of rain fell in just a few hours
- The second storm arrived before soils and drainage systems had recovered.
The City has dealt with severe flooding before. During the infamous August 2014 storm, rainfall exceeded the City’s previous one-day rainfall record (67 mm from 1979), with some neighbourhoods experiencing well beyond a “100-year storm.” Even that event has become the benchmark for extreme weather planning in St. Catharines.
The Impact Across Niagara
Flooding affected communities across the Niagara Region including:
- St. Catharines
- Niagara Falls
- Thorold
- Welland
- Niagara-on-the-Lake
Residents reported:
- flooded basements
- sewer backups
- damaged furnaces and water heaters
- ruined finished basements
- washed-out roads
- stranded vehicles
- significant property damage
Many homeowners experienced flooding twice within one week, creating an enormous emotional and financial burden. Community reports describe widespread basement flooding and extensive cleanup efforts across numerous neighbourhoods.
What Has the City Been Doing?
Since the storms, the City of St. Catharines has focused on:
- emergency response
- pumping operations
- clearing storm drains
- debris removal
- additional waste collection
- assisting residents through cleanup
- providing information on insurance and flooding assistance
The City has also directed residents toward basement flooding resources and recovery information while coordinating additional garbage collection for flood-damaged materials.
The Infrastructure Debate
Whenever flooding of this magnitude occurs, questions naturally arise about whether municipal infrastructure is capable of handling today’s weather.
Many residents have criticized:
- aging sewer infrastructure
- combined sewer systems
- drainage capacity
- storm sewer maintenance
At the same time, engineers and municipal officials note that these storms produced rainfall volumes far beyond what most urban drainage systems are designed to manage.
Both statements can be true.
Older infrastructure certainly presents challenges, but storms of this intensity can overwhelm even modern systems. In fact, St. Catharines’ own planning documents recognize that heavier rainfall events are becoming more frequent due to changing climate conditions and that continued investment in stormwater infrastructure will be necessary.
Resources for Homeowners
If your home has been affected, don’t wait.
Contact your insurance company as soon as possible and document all damage with photographs before beginning major cleanup.
Helpful municipal resources include:
- Citizens First
- 905-688-5600
- [email protected]
- City basement flooding information
- Flood recovery updates
If you or someone you know is still struggling with cleanup because of age, mobility, health, or other challenges, please register for the City’s Vulnerable Resident Assistance Registry.
Fire Services and the Red Cross are also continuing to support residents displaced from the flood.
Residents should also monitor Niagara Region announcements regarding additional garbage collection and flood-damaged waste disposal.
How to Help Protect Your Home From Future Flooding
While no home can be made completely flood-proof during record-breaking storms, there are several maintenance steps that can significantly reduce your risk.
Clean your eavestroughs
Leaves and debris can force water over the edge of your gutters, allowing it to pool beside your foundation.
Extend your downspouts
Water should discharge at least 6–10 feet away from your home’s foundation whenever possible.
Check your grading
Your yard should slope away from your home so water naturally drains away instead of toward your foundation.
Test your sump pump
Pour water into the sump pit and confirm:
- the float activates
- the pump operates properly
- discharge water flows away from the house
If you have a battery backup, test that too.
Install a backwater valve
A backwater valve can help prevent sewage from backing up into your basement during periods of heavy rainfall.
Some municipalities have assistance programs for installation.
Seal foundation cracks
Small cracks can become significant water entry points during prolonged rainfall.
Keep window wells clear
Ensure drains are functioning and window wells remain free of leaves and debris.
Store valuables off the basement floor
Plastic shelving or raised storage can prevent thousands of dollars in unnecessary damage.
Review your insurance
Many homeowners assume flood damage is automatically covered.
Ask your broker specifically about:
- sewer backup coverage
- overland flood insurance
- limits and deductibles
Where to go from Here?
The recent flooding serves as a reminder that extreme weather is becoming an increasingly important consideration for Niagara homeowners. While municipalities continue investing in stormwater infrastructure, homeowners also play a vital role in reducing their own risk through regular maintenance, proper drainage, and appropriate insurance coverage.
If you have questions about buying or selling a home after water damage, or you’re wondering how a property’s flood history may affect its value, we’re always happy to help you navigate the local market with honest advice.