1910.1053(d)(3)(iii): Repeat Silica Monitoring Every Six Months
When the most recent monitoring shows respirable crystalline silica exposures at or above the action level but at or below the PEL, the employer must repeat monitoring within six months of the most recent monitoring.
Key takeaways
- 1910.1053(d)(3)(iii) is part of OSHA's general industry standards (29 CFR Part 1910).
- OSHA cited it 22 times in the last 3 years, in 22 inspections, with $66,912 in current penalties.
- Most citations: TN (3), CT (2), MN (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)(iii) 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
(iii) Where the most recent exposure monitoring indicates that employee exposures are at or above the action level but at or below the PEL, the employer shall repeat such monitoring within six months of the most recent monitoring. 22 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 | 3 |
| 2024 | 10 |
| 2025 | 4 |
| 2026 | 5 |
Top states: TN (3), CT (2), MN (2), NE (1), RI (1)
Largest penalties
| Employer | Location | Penalty for this rule |
|---|---|---|
| CHAMPION HOME BUILDERS INC. | SANGERFIELD, NY | $16,550 |
| O & G INDUSTRIES, INC | BEACON FALLS, CT | $6,650 |
| SIOUX CITY FOUNDRY CO. | SOUTH SIOUX CITY, NE | $6,250 |
| HENRY BRICK COMPANY, INC. | SELMA, AL | $5,759 |
| CONCRETE CONSTRUCTION SYSTEMS, LLC | BETHEL, PA | $4,500 |
Free toolbox talk
A 5-minute crew talk on 1910.1053(d)(3)(iii), plus alerts when this rule changes. Free.
OSHA interpretation letters
None exist. OSHA has not published a letter of interpretation for 1910.1053(d)(3)(iii).
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)(iv) 24 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
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
When is monitoring repeated within six months?
When the most recent monitoring shows exposures at or above the action level but at or below the PEL.
Who must do the repeat monitoring?
The employer.
Is the six months measured from the first monitoring?
No. It is within six months of the most recent monitoring.
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.