Halo Learn

How smart water leak detection works in condominium buildings

A plain-language explainer of sensors, flow meters, automatic shut-off valves, and why building-wide coordination matters more than individual unit devices.

Published May 13, 2026 · By Daniel Dietzen

Daniel Dietzen

Sales Lead, Halo Protection Systems

Daniel Dietzen has over 10 years of experience in water leak detection and building protection systems, beginning with hands-on installation and customer service work in 2015. At Halo Protection Systems, he has worked closely with engineers, property managers, owners, and installation teams to help design, deploy, and improve whole-building leak detection systems for condominium and multi-family properties.

What components are in a building-wide leak detection system?

A coordinated condo system is more than a pile of standalone sensors. It has four working parts:

• Wireless moisture sensors — small, battery-powered devices placed in leak-prone spots (under sinks, behind toilets, near appliances, water heaters, and HVAC equipment). Each is labeled by residence, room, and location.
• Sensor hubs — receive signals from sensors inside a unit and relay them onto the building network.
• Electric shut-off valves — installed at each residence's main water supply line(s). Some residences need three to six valves, including separate valves for HVAC closed-loop systems.
• Optional water flow meters — track abnormal water usage patterns that sensors alone may not see.

A central controller and gateways form the building-wide network and feed a portal where staff, owners, and a 24/7 response center can see live status.

How does a leak event actually flow?

1. A sensor detects moisture — for example, under the primary bath sink in Unit 702.
2. The sensor hub forwards the event over the building's long-range network to the controller.
3. The controller identifies the exact location, opens an event record, and triggers alerts (text, email, app, and/or staff dashboard).
4. If shut-off valves are installed for that residence, the controller closes the mapped valves and marks the unit's water status as "off."
5. Owners, staff, and (if subscribed) the 24/7 response center can confirm what happened and decide when to safely re-open water.

Why does a building-wide network matter?

Owner-by-owner devices that depend on each resident's Wi-Fi can drop offline whenever a router is unplugged, the internet account is canceled, or an owner forgets to reconnect after a vacation. In a multi-residence building, that creates a quiet patchwork of coverage that nobody is tracking.

A dedicated building network — Halo uses long-range LoRaWAN with gateways placed approximately every six floors — keeps every device on the same managed system. Staff and management can see, in one place, which devices are online, low on battery, or in need of attention.

What role do automatic shut-off valves play?

Detection alone still depends on someone being available, seeing the alert, understanding the location, and acting fast. Automatic shut-off changes that calculation: when moisture is detected in a mapped location, the system isolates the water supply within seconds — long before the water can work its way down to the units below. For traveling owners and units occupied by guests or housekeepers, this is often the difference between a small wet patch and a multi-unit insurance claim.

Where does ongoing service fit in?

A leak system is only useful on the day a leak actually happens, which might be year 1 or year 10. Condos are constantly changing — units change hands, appliances get swapped, renovations cut into walls. The system should include device-health visibility, scheduled on-site service, and a 24/7 response center so that the protection that exists on install day is still working years later.