Prevent Commercial Water Damage from Plumbing and Appliances

1. Insurance & Risk Awareness 

• Check your policy: Coverage often includes sudden pipe bursts or appliance failures but excludes flooding, sewer backup, and gradual leaks. Confirm specifics with your insurance professional. 

• Risk factors: Multi-story and vacant buildings, frozen pipes, and aging water heaters, boilers/machinery, or rooftop HVAC units are higher risk. 

• Claims: Regular maintenance records help ensure claims are honored after severe weather or system failure. 

 

2. Plumbing and Appliances 

Leaks often begin in kitchens, bathrooms, or mechanical rooms. Watch for:

• Wet spots on floors, cabinets or near plumbing 

• Mold or mildew in damp areas 

• Rust stains, noisy pipes, or indications of condensation 

• Unexplained spikes in water bills 

• Signs of wet soil or erosion near the building 

 

Toilets 

In multistory buildings, even a small toilet failure can lead to extensive water damage across multiple units or floors. 

• Replace supply hoses every 3-5 years. 

• Fix leaking shut-off valves and constantly running toilets promptly. 

• Replace cracked bowls to avoid leaks. 

• Post reminder signs and provide a nearby trash can to prevent flushing wipes and other non-flushable items. 

 

Faucets & Sinks 

Hidden leaks under sinks and clogged drains can cause serious water damage over time. 

• Schedule a professional drain cleaning every 1-2 years. 

• Check under sinks monthly for moisture, rust, or water stains. Tighten loose connections and replace worn supply lines. 

• Maintain caulking and grout around sinks to prevent water from seeping. 

 

Water Heaters 

Most failures occur as water heater tanks age, with capacities from 40 to 100 gallons potentially releasing large amounts of water.  

• Place a drip pan underneath for small leaks and install an automatic shut-off valve. 

• Inspect every 6 months for leaks, rust, or corrosion.  

• Schedule a professional inspection annually. 

• Flush the tank once a year to reduce sediment and extend lifespan.  

• Inspect anode rod yearly. Replace if heavily corroded (usually located on top of the tank), as a dissolved rod can lead to premature tank failure. 

• Keep thermostat setting at 120°F for safe, efficient hot water. If your tank has two, set both to the same temperature. 

• Replace units at 7 to 10 years to prevent unexpected failure. 

 

3. Building Systems 

Building systems like fire sprinklers, HVAC, and boilers require regular staff checks and professional maintenance to prevent costly water damage. 

 

Fire Sprinklers 

Some of the main causes of sprinkler system failure are corrosion, misfires, and improper installation.  

Monthly Staff Visual Checks 

• Confirm valves are in their normal open or closed position, sealed or locked, accessible, and free from leaks or damage.  

• For wet sprinkler systems, verify temperatures are maintained of at least 40 degrees Fahrenheit.  

• Ensure there is at least 18 inches of clearance around sprinkler heads, with no storage or materials blocking them.  

• Visually inspect components for any signs of physical damage, corrosion, or paint on sprinkler heads and pipes.  

• Check that pipes, hangers, and bracing supports are secure and intact.  

• Ensure valve rooms and fire department connections (FDC) are free from obstructions and easily accessible.  

• Verify that the alarm device panel status is “normal” and that there are no visible issues.  

• Fire Pump (if applicable): Confirm the pump’s running status is normal and that there are no alerts.  

 

Professional Quarterly/Annual Checks 

• Full System Inspection: A professional should conduct a comprehensive inspection of all sprinkler heads, valves, pipes, brackets, and hangers in accordance with NFPA 25.  

• Main Drain Test: Measure water pressure and flow to check for consistency and proper system health.  

• Antifreeze Testing: Verify the concentration of antifreeze in freeze protection systems.  

• Fire Pump Test: Perform a test to ensure the fire pump activates, maintains pressure, and meets required standards.  

• Alarm Device Testing: Test mechanical and electronic alarm devices and check their connection to central monitoring.  

• Documentation Review: Review inspection and test documentation to ensure it’s sent to the fire department and complies with codes.  

• Internal Pipe Inspection: This may be required for a full annual inspection to check for mineral buildup or sediment.  

 

HVAC 

Clogged drain lines, a malfunctioning condensate pump, frozen evaporator coils, and improperly connected pipes can cause water to back up and leak.  

 

Monthly Staff Checks  

• Inspect and replace dirty air filters to ensure good airflow and system efficiency.  

• Ensure registers and vents are clean and not blocked by furniture or debris to improve airflow.  

• On the outside unit, clear any debris or vegetation from around the condenser unit to ensure proper function.  

• Listen for unusual sounds (grinding, rattling) during operation.  

• Cycle the HVAC system on and off to ensure it’s working correctly.  

 

Professional HVAC Technician Checks 

• Electrical: Inspect/tighten connections; check motor voltage/amperage. 

• Coils & Fans: Clean evaporator/condenser coils and fan blades. 

• Belts & Pulleys: Check for wear, tension, and replace if needed. 

• Lubrication: Grease motor bearings and moving parts. 

• Ductwork: Inspect for leaks, damage, and proper insulation. 

• Drain Lines: Clean pans and lines to prevent clogs/water buildup. 

• Refrigerant: Check levels and inspect lines for leaks or damage. 

• Thermostat & Controls: Test calibration and verify safety controls. 

• Heating Components: Inspect heat exchanger for cracks/corrosion and clean burner assembly. 

  

Vacancy 

Water damage risks increase when a building is unoccupied. Routine checks, even during downtime, help prevent costly damage. 

 

Staff/Owner Checks  

• Keep the indoor temperature above freezing to avoid burst pipes. 

• Install water sensors that send alerts if a leak occurs. 

• Before long-term vacancies, confirm all pipes, valves, and fixtures are properly sealed. 

• Schedule periodic walkthroughs to identify potential leaks, standing water, or temperature issues. 

 

Professional Checks 

• Have a licensed plumber inspect plumbing and mechanical systems prior to extended vacancy. 

• Ask contractors to verify winterization steps (e.g., antifreeze in vulnerable systems). 

• Document inspections and any preventive work performed. 

 

Boilers 

Boilers expand and contract during operation, which can lead to cracks, leaks, or pipe wear over time. Proactive checks reduce the risk of major failures. 

 

Staff/Owner Checks  

• Monitor for unusual noises, leaks, or corrosion around the boiler and pipes. 

• Ensure the boiler room remains dry and accessible, with no obstructions. 

• Record any visible changes in boiler performance or water pressure. 

 

Professional Checks 

• Schedule a licensed technician to inspect boilers at least annually and before long-term vacancies. 

• Have the technician check for cracks in the housing, wear on pipes, and proper expansion/contraction. 

• Service safety valves, joints, and seals; repair or replace worn components. 

• Keep detailed maintenance records for warranty and insurance purposes. 

 

Technology: Smart Water Leak Detection Solutions 

Smart water monitoring systems provide early warnings and can automatically stop leaks before they cause costly damage. These systems are a strong investment for any business. 

Understanding Options: 

• Whole-Business Shut-off Valve Systems: Professionally installed devices spliced into the main water line. These devices monitor water flow and pressure and automatically shut off the valve if abnormal use is detected.  

• Water Leak Sensors: Battery-powered devices placed near appliances (e.g., under sinks, toilets, water heaters, boilers). These devices send alerts when moisture is detected, and some DIY models can automatically close quarter-turn valves. 

Staff/Owner Actions  

• Place battery-powered leak sensors near high-risk areas such as sinks, toilets, water heaters, and boilers. 

• Test sensors regularly to confirm they sound an alarm or send a mobile alert when moisture is detected. 

• Replace batteries as needed to ensure devices remain active. 

Professional Installations 

• Install a whole-building shut-off valve system directly into the main water line. These devices monitor water flow and pressure and automatically close the main valve if abnormal usage is detected. 

• Work with a licensed plumber or contractor to integrate sensors into your broader building management system. 

• Ensure systems are tested and calibrated during routine maintenance.