NFPA 25 Sprinkler Inspection Schedule
The NFPA 25 inspection, testing, and maintenance schedule for wet and dry sprinkler systems — with which tasks trained staff can perform in-house.
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NFPA 25 schedule
Every requirement carries its code section and the edition it was verified against. ★ = qualified in-house under the national code, but licensing commonly required locally — confirm with your AHJ.
This is not one schedule from one edition. The rows below were verified against different editions of NFPA 25 (2020 and 2023), shown per row in the Code column. Section numbers and intervals move between editions, and we have not determined which edition your jurisdiction has adopted — read each row against the edition beside it and confirm with your AHJ rather than treating the table as a single document.
| Task | Frequency | Who may perform | Code (edition) | Record |
|---|---|---|---|---|
| Gauges + control valves (dry / pre-action / deluge) | Weekly | In-house (basic) | NFPA 25 Table 5.1.1.2 (2023 ed. text; your AHJ's adopted edition governs) | Log |
| Gauges + alarm valves (wet systems) | Monthly | In-house (basic) | NFPA 25 Table 5.1.1.2 (2023 ed. text; your AHJ's adopted edition governs) | Log |
| Control valves: sealed / locked / supervised, correct position | Monthly | In-house (basic) | NFPA 25 §13.3 (2023 ed. text; your AHJ's adopted edition governs) | Log |
| Waterflow alarm devices, supervisory devices, FDC condition ★ | Quarterly | In-house (qualified)★ | NFPA 25 §5.3.3 / §13.7 (2023 ed. text; your AHJ's adopted edition governs) | Test record |
| Main drain test at each riser (backflow / PRV on sole supply) ★ | Quarterly | In-house (qualified)★ | NFPA 25 §5.3.3 (main drain quarterly where sole supply passes through backflow preventer or PRV) (2023 ed. text; your AHJ's adopted edition governs) | Static + residual pressures; compare to prior; >10% drop investigated |
| Main drain test (all risers) ★ | Annual | In-house (qualified)★ | NFPA 25 §13.2.5 (2023 ed. text; your AHJ's adopted edition governs) | Pressures vs prior year |
| Full inspection — heads, pipe, hangers, bracing, signage, spare heads | Annual | Certified / licensed | NFPA 25 §5.2 (2023 ed. text; your AHJ's adopted edition governs) | Report + deficiency list |
| Internal pipe assessment (obstruction investigation) | Every 5 years | Certified / licensed | NFPA 25 §14.2 (2023 ed. text; your AHJ's adopted edition governs) | Report |
| Sprinkler head sample test — standard-response heads (50 years, then every 10) | Every 50 years | Certified / licensed | NFPA 25 §5.3.1 (2023 ed. text; your AHJ's adopted edition governs) | Lab report |
| Sprinkler head sample test — fast-response heads (20 years, then every 10) | Every 20 years | In-house (qualified) | NFPA 25 §5.3.1.1.1.2 (2020 ed. text; your AHJ's adopted edition governs) | Laboratory test report. |
| Dry-pipe / pre-action full trip test with control valve wide open ★ | Every 3 years | In-house (qualified)★ | NFPA 25 §13.4.4.2.2 (3-year full trip) (2020 ed. text; your AHJ's adopted edition governs) | Trip test report with trip time and water delivery time. |
| Dry-pipe valve partial trip test (priming water, low-point drains) | Annual | In-house (qualified) | NFPA 25 §13.4.4.2.1 (annual partial trip) (2020 ed. text; your AHJ's adopted edition governs) | Valve test report. |
| Antifreeze solution test — specific gravity / freeze point at each loop | Annual | In-house (qualified) | NFPA 25 §5.3.4 (antifreeze) (2020 ed. text; your AHJ's adopted edition governs) | Solution test record per loop. |
Other schedules: NFPA 72 · NFPA 96 · NFPA 110 · NFPA 80 · NFPA 10
National consensus-standard baseline with the edition noted per item. Your state, fire marshal, or accrediting body may require more frequent service or licensed personnel where a qualified person is shown. General information, not legal or engineering advice — confirm with your AHJ.
Questions people ask
- How often does NFPA 25 require inspection?
- NFPA 25 sets a schedule from weekly, monthly, quarterly, annual intervals. The full task-by-task table with code sections and who may perform each task is shown above, and the calendar builder dates it from your real last-completed dates.
- Which of these tasks can be done in-house?
- Tasks marked Tier 1 or Tier 2 can be performed by trained facility staff with documentation under the national code. Tier 3 tasks require a certified or licensed professional. Starred tasks are qualified in-house under the national code but licensing is commonly required locally — confirm with your AHJ.