Leaks can occur anywhere in the water supply system. Use this checklist to inspect common indoor areas for potential leaks and water loss. Focus on the relevant areas for your site.

Indoor Inspection Checks

Walk the interior of the building, looking for the following signs of a potential leak:

• Sound of running water (when fixtures are off)
• Water flowing into a drain unexpectedly
• Pooled water on floors or other surfaces
• Saturated materials (drywall, carpet, or ceiling tiles)
• Stains or discolorations (walls, ceilings, or floors)
• Unusual Odors (may indicate mold or mildew from hidden water buildup)
• Inconsistent Water Pressure (sudden drops can signal leaks)
• High Humidity (noticeable dampness or condensation)

Indoor Leak Location Checklist

Conduct a thorough walkthrough of the building interior, examining all endpoints where water is used. Check the following common areas where leaks can occur:

1. Water Meter: Check both indoor and outdoor locations.
2. Water Meter Backflow: Inspect both indoor and outdoor locations.
3. Restrooms: Inspect toilets, urinals, faucets, and automatic flush/aerator functions for leaks.
4. Breakroom: Check sinks, water coolers, ice machines, and coffee makers for any leaks.
5. Ice Machine: Look for slow leaks around connections and drainage.
6. Water Fountains and Dispensers: Inspect for slow leaks or continuous drips.
7. Fire Riser Room: Examine valves and connections for slow leaks.
8. Fire Riser Connections: Ensure all connections are secure and dry.
9. Pump Room: Inspect valves, pumps, and lines for signs of leaks.
10. Janitor’s Closet and Mop Sinks: Check sink fixtures and hose connections.
11. Indoor Water Features: Inspect pumps, connections, and float valves for leaks.
12. Indoor Garden Center: Inspect all hose bibs, spigots, and connections for leaks.
13. Pressure Checks: Test water pressure at different points to identify any sudden

Mechanical Equipment Inspection Checklist

Walk the mechanical rooms and utility closets and inspect the following elements:

1. Cooling Tower: Verify the makeup valve, float valve, and blowdown line for leaks.
2. Boilers and Chillers: Inspect the makeup lines for any signs of leakage.
3. Water Heaters: Check for signs of rust or corrosion on the tank, leaks at the pressure relief valve, moisture around inlet/outlet connections, and proper sealing of the drain valve.
4. Water Softener: Inspect around the brine tank, inlet/outlet connections, and control valve, and ensure the drain line is free of clogs or overflow.
5. Closed Loop Systems: Check for visible drips or loose connections.
6. Reverse Osmosis Systems: Ensure filters and connections are dry and free of leaks.
7. Pumps and Motors: Inspect seals, hoses, and connections for any visible leaks.
8. Air Compressors: Check hoses, connections, and pressure regulators for leaks.
9. Steam Systems: Inspect valves, pipes, and joints for leaks or condensation.
10. Chilled Water Systems: Look for moisture around pipes, valves, or fittings.
11. Expansion Tanks: Check for moisture or leaks around tank connections.
12. Drip Pans and Collection Trays: Ensure no water accumulation around equipment.
13. HVAC Units: Inspect drain lines and condensate pans for water leakage or blockages.