Fire Sprinkler Inspection Under NFPA 25: A Plain-English Guide
The Fire Code Authority · Updated November 11, 2026
NFPA 25 is the standard for keeping water-based fire protection systems working after they’re installed. It organizes work into inspections (looking), tests (operating), and maintenance (keeping parts in good condition), on intervals ranging from weekly to multi-year.
What a sprinkler inspection looks at
- Sprinkler heads: condition, obstructions, paint or corrosion
- Control valves: open, accessible, and supervised
- Gauges, alarm devices, and waterflow switches
- Fire department connection
- Pipe, fittings, and hangers that can be seen
- Dry, preaction, and deluge valves and their air supply
Multi-year items to plan for
- Periodic internal pipe assessments for obstructions
- Gauge replacement or calibration
- Sample testing or replacement of older sprinkler heads at age milestones set by the standard
- Full-flow trip tests for dry systems on a multi-year cycle
Important
Inspection frequencies depend on the edition of the standard your Authority Having Jurisdiction (AHJ) has adopted, plus any local amendments and insurer requirements. Confirm with your AHJ or a licensed contractor.
Educational summary, not legal advice or an engineering determination. Confirm requirements with your Authority Having Jurisdiction.