Visual inspection can show signs of damage that may have occurred during installation or standard operation. Though not always evident, a quick visual inspection can usually identify wear or corrosion.

Streakiness, heavier sections, fluttering, or skewed/lopsided spray patterns can all indicate that a nozzle is not operating as designed or intended.

The flow rate and operating pressure of the nozzle are directly related. If these values change from nominal, it can indicate issues with the nozzle like clogging or excessive wear.

Changes in overall system performance, such as temperatures, pollutant levels, and coverage, can indicate nozzle issues like damage, clogging, or wear.