Point sensors
Detect water at a specific floor location near equipment, fixtures or known entry points.
Water alarms and sensors
Monitoring does not stop water, but it can create time to act.
Sensors can detect water, unusual levels, pump conditions or plumbing flow. Their value depends on placement, connectivity, power, notification and a defined response.
- Ontario-focused
- Plain-language guidance
- Risk reduction, not guarantees
The essential answer
Choose sensors around specific failure scenarios, test notifications end to end and identify who will respond. An alert without access, authority or a response plan may not reduce damage.
Who this guide supports
Use this page when the property, question or decision matches one of these situations.
- Homeowners wanting earlier warning of leaks or sump problems
- Residents who travel or leave properties vacant
- Older adults and households needing remote support
- Owners integrating monitoring into a broader resilience plan
Understand the system
Four parts of the decision deserve separate attention.
Level and pump alarms
Indicate high water, pump failure, power loss or abnormal cycling in a sump system.
Flow monitoring
Can identify unusual domestic-water use and may support automatic shut-off where appropriate.
Remote notification
Sends app, text, email or monitoring-centre alerts, subject to power and connectivity.
Guidance 1
Design around failure scenarios
Place sensors where water is likely to appear first, not where devices are simply easy to hide. Consider water heater, laundry, mechanical room, sump pit, low openings and vulnerable storage.
A sensor should not obstruct maintenance or be placed where routine condensation creates constant false alarms.
- List the event each sensor is intended to detect
- Identify the first likely wet point
- Protect devices from accidental movement
- Use labels and a placement map
Guidance 2
Test the complete notification chain
A local siren may not help when the house is empty. A smart alert may fail if Wi-Fi, internet or utility power is lost.
Test the sensor, hub, internet connection, app permissions, contact list and backup power as one system.
- Enable critical notifications where available
- Keep account recovery details current
- Add more than one responsible contact
- Schedule recurring test reminders
Guidance 3
Connect alerts to safe action
Automatic shut-off can reduce damage from some domestic plumbing leaks but does not stop sewer backup, groundwater or overland flooding.
The response plan should state who can enter, what can be shut off safely, when emergency services or qualified trades are required and when occupants must stay out.
- Post water and electrical shut-off information
- Avoid entering electrified or contaminated water
- Provide access instructions for trusted responders
- Document alarm events and corrective work
Practical workflow
Move from observation to a documented next step.
- 1
Define the leak or flood events to detect
- 2
Select sensor types and locations
- 3
Configure power, connectivity and contacts
- 4
Test local and remote notifications
- 5
Review placements, batteries and response instructions regularly
Homeowner checklist
Record each completed item and create a follow-up action for anything unresolved.
Continue through the RSM system
Related guidance, programmes and professional pathways.
Official source pathway
Use current public sources for emergency, insurance, programme and technical context.
RSM summarizes and connects information but does not replace the issuing authority. Review the current official page before acting.
Frequently asked questions
Clear limits help homeowners make better decisions.
Where should a water sensor go?
Place it at a likely first-wet location associated with a defined failure scenario, while keeping it secure and maintainable.
Will a smart sensor work in a power outage?
Only if the device, hub, network and communications path have suitable backup power.
Can a shut-off valve stop basement flooding?
It can reduce some domestic-water leaks but does not address overland flow, groundwater or sewer backup.
How often should sensors be tested?
Follow manufacturer guidance and test the complete notification path regularly, including after router, phone or account changes.
Editorial and review note
This educational page was prepared by Regional Stormwater Management using official public sources and a risk-reduction framework. It does not provide engineering, legal, insurance or municipal approval. Content is reviewed when official guidance changes and on the RSM editorial schedule.
Recommended next step
Turn alerts into an action plan
Build a household emergency procedure for storms, outages, water entry and evacuation.