Fire hydrant testing tests fire flow pressure, hydrant flow testing, inspections, surveys and valve exercising
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Flow Testing, Annual Safety Inspections, ISO Reporting

  • Annual Safety Inspections

  • Static Pressure Testing

  • Flow Pressure Testing

  • Residual Pressure Testing

  • Water Main Flushing

  • Comprehensive Reporting

  • ISO Reporting

  • Work Order Tracking and Management

Comprehensive reporting provided in conjunction with regular flow testing and inspections helps lower your ISO rating. Annual fire hydrant safety inspections and testing identifies OUT OF SERVICE hydrants, verifies reliability, freshens water supply and identifies low pressure areas throughout the distribution system. All hydrants should be static and flow pressure tested. Flow testing annually will ensure flow pressures are adequate to fight fires. 

Each year, water systems are affected by new construction, scheduled maintenance, erosion and other activities. In order to verify that all fire hydrants are fully operational, and water pressures are sufficient, it is vital to annually conduct comprehensive inspections, testing, flushing, and reporting. Public safety is everyone’s safety. All fire hydrants are required to be verified to work on an annual basis. After verifying operability and flow pressures, it is equally important to maintain proper records indicating all work which was performed and any problem remedies and/or maintenance.

The following issues are identified during the survey and safety inspection and are best detected prior to an emergency:

  • Find “OUT OF SERVICE” hydrants (no water available, low pressure, severe below ground leak, broken coupling, seized operating nut/hydrant main valve)

  • Locate low flow hydrants

  • Analyze flow data to identify low flow areas 

  • Identify areas affected by closed main line valves

  • Hydrants in extreme need of lubrication

  • Identify hydrant main valve leaks

  • Record seized pumper and hose caps

  • Identify bonnet and flange gasket leaks

  • Notate safety issues: broken flanges, cracked barrels, loose bonnets, rusted nuts & bolts, loose connections, etc.

  • Locate ant beds, wasp nests, broken glass, litter, etc…

  • Identify hydrants hidden by brush and foliage

  • Check to ensure blue markers are present

  • Note which hydrants need repainting


Annual hydrant pressure testing:

Testing hydrants annually ensures citizens and city personnel their water distribution system is at it’s full potential and provides valuable data to effectively fight fires during an emergency.

An annual testing program should includes fully pressurizing each hydrant, flow testing each hydrant, assigned flow classifications, residual testing to calculate water distribution system capacities, assigned ISO classifications, locating low pressure areas and analyzing hydrant pressures to identify areas affected by valve closures.

Hydrants are fully pressurized (without flow) to verify reliability, check for leaks and record static pressure. Next, the hydrant is flow tested. Flow testing identifies low flow areas and verifies reliable pressures for fighting fires. Residual tests provide specific test data indicating system potential at specific residual pressures. All hydrants are assigned a flow classification for painting purposes, and are classified according to ISO standards.

Once the fire flow test is initiated, we determine the gallons per minute available at each fire hydrant. Pressure data gathered while fire flow testing includes:

  • Static pressure

  • Flow pressure

  • Residual Pressure

  • Gallons per minute at hose nozzle

  • Gallons per minutes at 20 PSI

  • Main size diameter

After a fire hydrant survey is complete, a Fire Hydrant Survey Report is provided outlining all information gathered during the survey in an organized manner. The report includes:

  1. Out of service hydrants

  2. Low pressure hydrants

  3. Flow classifications

  4. Hydrant classification per ISO 

  5. Residual Flow Tests

  6. Hydrants in extreme need of lube, oil, grease

  7. Seized operating nuts

  8. Seized pumper and hose caps

  9. Loose nozzles need to be recaulked

  10. Leaking hydrant main valves

  11. Bonnet and flange repairs

  12. Miscellaneous parts needed

  13. Hydrants needing extensions

  14. Blue markers missing

  15. Accessibility of each hydrant

  16. Missing chains and S-hooks

  17. Needed paint

  18. Locations with excessively dirty flow

  19. New hydrant locations

  20. Private hydrant locations 

  21. Make, model, and year of each hydrant

  22. Location of hydrant’ isolation valve and condition of valve box cover


In summary, the main reasons for annual flow testing and inspecting fire hydrants are:

  1. Locate OUT OF SERVICE hydrants

  2. Verify safe operation of hydrant

  3. Determine fire fighting capabilities

  4. Help lower your ISO rating

  5. Determine the general conditions and capabilities throughout the distribution system

  6. Detect closed valves by isolating low pressure zones

  7. Ensure the safety of your residents and property and avoid liabilties issues

  8. Ensure fresh water supply by flushing out sediment, rust, and debris

  9. Have a detailed report

  10. Up-to-date GIS data


Flow tests for cities and private entities. We also provide fire hydrant and valve surveying for GIS and work order management systems