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4.2. Local Law 77 - 90 Day Inspection


DOHMH specifies testing every three (3) months. The inspection is required prior to seasonal startup. NYS requires an evaluation of proper functioning of the conductivity control.  

If the tower is not in use during the winter, a 90-day inspection is not required, nor is one required if the cooling tower is not in use. 

Corrective Actions  

Corrective actions mean disinfection, cleaning, flushing, and other activities to remedy biofilm growth, Legionella proliferation, or other system mechanical problems identified through monitoring, inspections, or other means as may be determined by the Department. 

  • Disinfection: Performed by your qualified person, disinfection requires using one or more biocides at a defined concentration, under specific conditions and for an established period to kill or inactivate pathogenic organisms. 
  •  InspectionsPerformed by your qualified person which will perform a visual inspection of the tower, inspect the water makeup quality, equipment functionality, review routine maintenance records and Legionella sampling tests. 
  • Cleaning: Usually requires the disassembly of cooling tower components and the use of physical or mechanical methods for the removal of: 
  • Biofilm 
  • Scale 
  • Debris 
  • Rust and other corrosive products 
  • Sludge 
  • Algae 
  •  Clean and Flush: To initiate immediate disinfection by increasing biocides within 24 hours. Within 48 hours perform remediation. Review treatment program, retest water within 3-7 days.  


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2. Boiler
3. Building
5. Elevator
6. Escalator
7. Facade
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    • 7.1.1. Scheduling
    • 7.1.2. Inspection
    • 7.1.3. Filing
8. Fire Alarm
9. Fire Extinguisher
10. Fuel Tank
11. Generator
12. Gravity Tank
13. Pool
14. Smoke Detector
15. Sprinkler System
16. Standpipe System
17. Hood Suppression