NFPA 25 sprinkler inspection schedule: what gets checked, and how often
Updated November 2026 · Bruhn & Bruhn Fire Protection
Most commercial wet-pipe sprinkler systems need a quarterly inspection, an annual inspection and test, and a five-year internal check, with some items looked at monthly by the owner. The building owner is responsible for making sure it all happens.
Who is responsible
NFPA 25 puts the responsibility for inspection, testing and maintenance on the property owner, or on a tenant or manager the owner has assigned it to in writing. A contractor like us does the work and keeps the records, but the fire marshal and the insurer will look to the owner if the schedule slips.
The quarterly and annual visits are where most of the work happens. A few checks are quick enough for building staff to do between visits, and we show them how.
The schedule for a typical wet-pipe system
| What | How often |
|---|---|
| Control valves: sealed, open, accessible | Weekly if sealed; monthly if locked or electrically supervised |
| System gauges: normal water pressure | Quarterly |
| Alarm valves, waterflow alarm devices, fire department connection | Quarterly inspection |
| Waterflow alarm test (water motor gong) | Quarterly |
| Waterflow alarm test (vane and pressure switches) | Semiannually |
| Main drain test | Annually, and quarterly where the only supply comes through a backflow preventer or pressure-reducing valve |
| Sprinklers, pipe, fittings and hangers, from the floor | Annually |
| Spare sprinkler cabinet and wrench | Annually |
| Control valve operation (full open and close) | Annually |
| Backflow preventer forward-flow test | Annually |
| Gauges replaced or calibrated | Every 5 years |
| Internal pipe assessment and obstruction check | Every 5 years |
| Sprinkler sample testing | Standard heads at 50 years, fast-response at 20, then every 10 years |
Dry-pipe, preaction and antifreeze systems need more
- Dry-pipe and preaction valves: gauges and enclosure heat checked more often in cold weather, a partial trip test every year and a full-flow trip test every three years, and low-point drains emptied before and during freezing weather.
- Antifreeze systems: the solution is tested every year before freezing weather. Existing systems have to use a listed antifreeze solution, so older glycol mixtures are being drained and replaced.
- Dry sprinklers: sample testing at 10 years and every 10 years after.
What a visit from us includes
We walk the building, work through the items due that visit, run the alarm and drain tests, and write up anything that doesn't pass. You get a written report with a plain-language list of deficiencies, each with a priority, and we quote the repairs. When something needs fixing before the next visit, we schedule it rather than leaving it on paper.
Frequencies here follow NFPA 25, 2023 edition. Your fire marshal or insurer may enforce a different edition or add requirements of their own; we'll tell you which applies to your building.
Questions owners ask
- How often does a commercial sprinkler system need to be inspected?
- Under NFPA 25, most wet-pipe systems get a quarterly inspection and an annual inspection and test, plus a five-year internal assessment. Control valves are checked weekly or monthly depending on how they're secured.
- Can our maintenance staff do the inspections themselves?
- Building staff can do the simple weekly and monthly checks, like confirming valves are open and gauges read normally. The quarterly and annual tests are usually required by the fire marshal and insurer to be done and reported by a qualified contractor.
- What happens if an inspection finds a problem?
- It goes on the report as a deficiency or impairment with a priority. Impairments that take the system out of service need attention right away; other items are scheduled for repair, and we quote them with the report.
Want us to handle it?
We do this work for commercial buildings across Middle Tennessee, North Alabama and Kentucky. See our sprinkler inspections service, or ask for a quote.