1910.164(c): Fire Detection System Maintenance and Testing
Employers must keep fire detection systems operable except during repairs or maintenance, test and adjust detectors as often as needed for reliability (factory calibrated detectors need not be adjusted after installation), and equip pneumatic and hydraulic systems installed after January 1, 1981 with supervised systems. Servicing, maintenance and testing must be done by a trained, knowledgeable person, and detectors that need cleaning must be cleaned at regular intervals.
Key takeaways
- 1910.164(c) is part of OSHA's general industry standards (29 CFR Part 1910, Subpart L).
- OSHA cited it 11 times in the last 3 years, in 11 inspections, with $27,993 in current penalties.
- Most citations: VI (2), IN (2), MD (1).
- Related part: 1910.164(c)(1) (11 citations).
- Free 5-minute toolbox talk for your crew below.
In this article
What this rule covers
29 CFR 1910.164(c) ("Maintenance and testing") is one requirement inside 1910.164 Fire detection systems, an OSHA general industry standard (Part 1910, Subpart L). It includes 5 sub-paragraphs. The official text below is copied word for word from the Electronic Code of Federal Regulations (eCFR). The numbers, injury cases and training on this page show how OSHA enforces it on real job sites.
Official text
(c) Maintenance and testing. 11 citations
(1) The employer shall maintain all systems in an operable condition except during repairs or maintenance. Open (c)(1) 11 citations
(2) The employer shall assure that fire detectors and fire detection systems are tested and adjusted as often as needed to maintain proper reliability and operating condition except that factory calibrated detectors need not be adjusted after installation.
(3) The employer shall assure that pneumatic and hydraulic operated detection systems installed after January 1, 1981, are equipped with supervised systems.
(4) The employer shall assure that the servicing, maintenance and testing of fire detection systems, including cleaning and necessary sensitivity adjustments are performed by a trained person knowledgeable in the operations and functions of the system.
(5) The employer shall also assure that fire detectors that need to be cleaned of dirt, dust, or other particulates in order to be fully operational are cleaned at regular periodic intervals.
Source: eCFR, text current as of 2026-10-15. Read all of 1910.164.
Where and how often it was cited
| Year | Citations |
|---|---|
| 2024 | 3 |
| 2025 | 4 |
| 2026 | 4 |
Top states: VI (2), IN (2), MD (1), NJ (1), IA (1)
Largest penalties
| Employer | Location | Penalty for this rule |
|---|---|---|
| U. S. POSTAL SERVICE - TRUJILLO ALTO STATION | TRUJILLO ALTO, PR | $16,552 |
| JBM SHERMAN CARMEL, INC. | BENNINGTON, VT | $3,641 |
| AUDUBON DEPARTMENT OF PUBLIC WORKS | AUDUBON, NJ | $2,800 |
| U.S. POSTAL SERVICE | CAPITOL HEIGHTS, MD | $2,500 |
| MID-STATES MANUFACTURING AND ENGINEERING, INC. | MILTON, IA | $2,500 |
Free toolbox talk
A 5-minute crew talk on 1910.164(c), plus alerts when this rule changes. Free.
OSHA interpretation letters
None exist. OSHA has not published a letter of interpretation for 1910.164(c).
Related parts of this rule
- 1910.164(c)(1) 11 citations
Get your crew competent
Trainers on Black Belt Safety: Marc Harvey, Dana Reyes
Trainers and suppliers: feature your business on this rule for $25/month.
Frequently asked questions
Must fire detection systems always work?
They must be maintained in an operable condition except during repairs or maintenance.
Who may service fire detection systems?
A trained person knowledgeable in the operations and functions of the system.
Do factory calibrated detectors need adjusting?
No. Factory calibrated detectors need not be adjusted after installation.
About this page
Sources
- 29 CFR 1910.164 (eCFR), text current as of 2026-10-15
- U.S. Department of Labor enforcement data: OSHA inspections, citations and accident records, copied nightly; data as of 2026-10-20
3-year window. Federal OSHA only; state-plan rules are not counted. Plain-language text is a summary, not legal advice; the official text controls. Black Belt Safety is not part of OSHA or the Department of Labor.