1910.1053(d)(3)(iv): Repeat Silica Monitoring Above the PEL
Where the most recent exposure monitoring shows employee exposures above the PEL, employers must repeat monitoring within three months of the most recent monitoring.
Key takeaways
- 1910.1053(d)(3)(iv) is part of OSHA's general industry standards (29 CFR Part 1910).
- OSHA cited it 24 times in the last 3 years, in 24 inspections, with $63,484 in current penalties.
- Most citations: PA (4), TN (3), CO (2).
- Related part: 1910.1053(d) Exposure assessment (548 citations).
- Free 5-minute toolbox talk for your crew below.
In this article
What this rule covers
29 CFR 1910.1053(d)(3)(iv) is one requirement inside 1910.1053 Respirable crystalline silica, an OSHA general industry standard (Part 1910). 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
(iv) Where the most recent exposure monitoring indicates that employee exposures are above the PEL, the employer shall repeat such monitoring within three months of the most recent monitoring. 24 citations
Source: eCFR, text current as of 2026-10-15. Read all of 1910.1053.
Where and how often it was cited
| Year | Citations |
|---|---|
| 2023 | 2 |
| 2024 | 15 |
| 2025 | 2 |
| 2026 | 5 |
Top states: PA (4), TN (3), CO (2), WI (2), NC (2)
Largest penalties
| Employer | Location | Penalty for this rule |
|---|---|---|
| TEXAS MATERIALS GROUP INC. | HOUSTON, TX | $9,844 |
| OWENS-BROCKWAY GLASS CONTAINER, INC. | MUSKOGEE, OK | $9,457 |
| HITACHI ENERGY USA INC. | BLAND, VA | $8,910 |
| BLEND-PRO, INC. | ALLENTOWN, PA | $5,646 |
| PETER BAKER & SON CO. | LAKE BLUFF, IL | $5,500 |
Free toolbox talk
A 5-minute crew talk on 1910.1053(d)(3)(iv), plus alerts when this rule changes. Free.
OSHA interpretation letters
Related parts of this rule
- 1910.1053(d) Exposure assessment 548 citations
- 1910.1053(d)(1) General 399 citations
- 1910.1053(d)(3) Scheduled monitoring option 120 citations
- 1910.1053(d)(3)(i) 71 citations
- 1910.1053(d)(3)(iii) 22 citations
- 1910.1053(d)(4) Reassessment of exposures 13 citations
- 1910.1053(d)(6) Employee notification of assessment results 11 citations
- 1910.1053(d)(6)(ii) 4 citations
- 1910.1053(d)(2) Performance option 4 citations
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Frequently asked questions
When must monitoring be repeated?
Within three months of the most recent monitoring, when it showed exposures above the PEL.
What triggers this?
The most recent monitoring indicating exposure above the PEL.
Who is responsible?
The employer.
About this page
Sources
- 29 CFR 1910.1053 (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 2026-10-21
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.