29 CFR 1926.1153 places specific, enforceable obligations on your company — here is what each one requires and where contractors most often fall short.
What Does 29 CFR 1926.1153 Actually Require?
29 CFR 1926.1153 covers every construction task where workers can reasonably be exposed to respirable crystalline silica. The standard does not just set a dust limit — it requires your company to build and maintain a system of controls, documentation, and oversight. The sections below walk through each mandatory employer obligation in the order OSHA inspectors typically evaluate them.
Obligation 1: Know Your Two Exposure Limits
The standard sets two numeric thresholds you must understand before anything else.
- Action Level (AL): 25 µg/m³ as an 8-hour time-weighted average. Crossing this line triggers exposure assessment, medical surveillance eligibility, and other obligations.
- Permissible Exposure Limit (PEL): 50 µg/m³ as an 8-hour time-weighted average. This is the hard ceiling. Engineering controls must reduce exposure to at or below the PEL.
Every training program, exposure control plan, and conversation with your foreman should use both numbers. Citing only the PEL while ignoring the action level is a common gap that leads to missed medical surveillance triggers.
Obligation 2: Implement Engineering and Work-Practice Controls First
Respirators are the last line of defense, not the first. 1926.1153 requires you to use engineering controls and work-practice controls to reduce exposure to or below the PEL before relying on respiratory protection.
Table 1 is your compliance shortcut. For the tasks listed in Table 1 — including handheld power saws, walk-behind saws, jackhammers, handheld grinders used for mortar removal, drilling rigs, and demolition equipment — the standard lets you skip air monitoring if you fully and properly implement the specified controls.
Table 1 controls include:
- Wet methods: Water must be delivered continuously and be integrated into the tool itself. A second worker with a garden hose does not satisfy Table 1.
- Local exhaust ventilation (LEV) with HEPA filtration: The vacuum or dust collector must capture 99.97% of particles at 0.3 micrometers and must include a filter-cleaning mechanism. A standard shop vac with a HEPA filter added does not comply.
- Enclosed cabs: Must be maintained under positive pressure with filtered intake air.
Table 1 compliance is all-or-nothing per task. An empty water tank, a clogged nozzle, or a cracked shroud voids the Table 1 safe harbor — even if the right equipment is on site. When that happens, you are pushed into the performance option under 1926.1153(d), which requires air monitoring.
Obligation 3: Write a Site-Specific Exposure Control Plan
You must have a Written Exposure Control Plan (WECP) under 29 CFR 1926.1153(g)(1). Generic corporate templates are among the most-cited deficiencies under the standard.
A compliant WECP must:
- Be site-specific — list the actual silica-generating tasks on that project
- Identify the engineering controls and work practices used for each task
- Identify the designated competent person by name
- Be available on site to workers and their representatives on request
- Be reviewed at least annually and updated whenever tasks, tools, materials, or controls change
The WECP is a living document. If you add a new Table 1 task mid-project, update the plan before work starts.
Obligation 4: Designate a Competent Person
The standard defines "competent person" at 29 CFR 1926.1153(b) as someone capable of identifying existing and foreseeable silica hazards and who has the authority to take prompt corrective action — including stopping work. A job title alone does not satisfy the requirement.
Three things your competent person must actually be able to do: 1. Identify silica hazards in the materials, tasks, and environment on that site 2. Evaluate whether Table 1 controls are implemented fully and properly before each shift 3. Stop a task and order corrective action without having to call a project manager first
If your designated person has to seek approval before halting a silica-generating task with a failed water system, OSHA treats your company as having no competent person.
Obligation 5: Manage Respiratory Protection Under 29 CFR 1910.134
When respirators are required — either because engineering controls cannot get exposure to or below the PEL, or because Table 1 specifically requires them — you must run a full written respiratory protection program under 29 CFR 1910.134. This is not optional.
The program must include:
- Medical evaluation by a PLHCP before any worker wears a respirator — no exceptions
- Fit testing before first use and at least annually, using the exact make, model, and size the worker will wear on the job
- Training on donning, doffing, and performing a user seal check every single time the respirator is put on
- A prohibition on facial hair at the sealing surface (including stubble)
For tasks like tuckpointing with a handheld grinder for mortar removal, the required protection factor under Table 1 is APF 25 — meaning a standard N95 or half-face APR (APF 10) does not comply. Verify the correct APF for each Table 1 task before issuing equipment.
Obligation 6: Enforce the Housekeeping Rules
29 CFR 1926.1153(f) prohibits two practices that workers default to without thinking:
1. Dry sweeping and dry brushing where these activities could contribute to silica exposure — unless wet methods or HEPA-filtered vacuuming are not feasible 2. Compressed air to clean clothing or surfaces — unless used with a ventilation system that effectively captures the resulting dust cloud
"Infeasible" is narrowly interpreted. Inconvenience and cost do not make wet methods or HEPA vacuuming infeasible. OSHA inspectors cite the presence of brooms and air hoses in silica work areas as evidence of a violation — they do not need an air sample to issue a citation.
Dried slurry from wet cutting also becomes airborne again under foot traffic. Housekeeping is not finished when the saw stops.
Obligation 7: Track Medical Surveillance Triggers
Under 29 CFR 1926.1153(h), you must offer medical surveillance to any employee who meets either of two independent triggers:
- Required to wear a respirator for 30 or more days per year, OR
- Exposed at or above the action level (25 µg/m³) for 30 or more days per year
Any part of a day counts as a full day. The 30-day count aggregates across all of your jobsites for that worker — it is not reset per project.
Once triggered, you must offer an initial examination within 30 days of the worker crossing the threshold. The exam must include a chest X-ray interpreted by a NIOSH-certified B Reader using the ILO classification system — a standard radiologist report does not satisfy the requirement. Periodic exams follow every three years. The exam is at no cost to the employee.
Medical surveillance records must be retained for the duration of employment plus 30 years per 29 CFR 1910.1020.
Obligation 8: Train Every Covered Employee
Training is required under 29 CFR 1926.1153(i) before any covered worker begins silica-generating tasks. The standard is performance-based: each employee must be able to demonstrate knowledge and understanding of the required topics. A sign-in sheet is not compliance.
Training must cover at minimum:
- Health hazards of silica exposure (silicosis, lung cancer, COPD, kidney disease)
- The specific tasks on your site that generate silica
- The controls your company uses — engineering, work-practice, and respiratory
- The contents of your WECP and who the competent person is
- How medical surveillance works and how workers access it
Training must be delivered in a language and at a literacy level each worker can understand. When tasks, tools, materials, or controls change in a way that makes prior training inadequate, retrain before the new work begins.
Employee exposure monitoring results must be communicated to affected workers within 5 working days — not 15. The 15-working-day window applies to general industry under a different standard. Missing the 5-day construction deadline is a frequent citation.
Where Contractors Get Cited Most Often
| Compliance Area | Most Common Failure |
|---|---|
| Written Exposure Control Plan | Generic template; not site-specific; not on site |
| Table 1 controls | Water tank empty; shop vac without filter-cleaning mechanism |
| Competent person | Designated by title only; no real stop-work authority |
| Housekeeping | Brooms and air hoses in silica work areas |
| Medical surveillance | 30-day threshold not tracked across jobsites |
| Respirator program | Medical evaluation skipped; wrong APF for the task |
| Training | Sign-in sheet only; no knowledge verification |
| Exposure monitoring notification | Results not delivered within 5 working days |
One More Thing: Recordkeeping Retention
Keep air monitoring and exposure records for 30 years. Keep medical surveillance records for the duration of employment plus 30 years under 29 CFR 1910.1020. Only the PLHCP's written medical opinion belongs in supervisor-accessible files — keeping full medical results in general personnel files violates the confidentiality requirements of 29 CFR 1910.1020.
Jobsite tracks OSHA compliance obligations, training completions, certifications, and site inspections in one place — so you know which workers have crossed the 30-day medical surveillance threshold, which sites have current WECPs on file, and which fit tests are due before they become a citation. See how Jobsite's compliance audit tools work →
FAQ
What is the difference between the action level and the PEL under the construction silica standard?
The action level is 25 µg/m³ as an 8-hour TWA. Crossing it triggers exposure assessment obligations, medical surveillance eligibility, and other requirements. The PEL is 50 µg/m³ as an 8-hour TWA — the hard ceiling your engineering controls must keep workers at or below. Both thresholds appear in 29 CFR 1926.1153, and both matter for compliance planning.
Do I still need a written exposure control plan if I use Table 1 controls?
Yes. The written exposure control plan is required under 29 CFR 1926.1153(g)(1) regardless of which compliance pathway you use. Table 1 removes the air monitoring burden, but it does not remove the obligation to have a site-specific WECP that identifies tasks, controls, the competent person, and housekeeping methods. The plan must be on site, accessible to workers, and reviewed at least annually.
How does the medical surveillance 30-day trigger work across multiple jobsites?
The 30-day count is per employee, per year, aggregated across all of your company's jobsites — it is not reset when a worker moves from one project to another. Any part of a workday spent wearing a required respirator for silica, or exposed at or above 25 µg/m³, counts as a full day toward the threshold. Once a worker crosses 30 days, you must offer an initial medical examination within 30 days per 29 CFR 1926.1153(h).
What makes someone a 'competent person' for silica under OSHA's standard?
29 CFR 1926.1153(b) defines the competent person as someone who can identify existing and foreseeable silica hazards and who has actual authority to take prompt corrective action — including stopping work immediately. The role requires genuine stop-work authority. If the person must get approval from someone else before halting a task with failed controls, OSHA treats the employer as not having a competent person, which is itself a citable violation.
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About the author
The Jobsite Editorial Team — Construction safety & OSHA compliance
The Jobsite Editorial Team writes the safety and compliance library behind Jobsite, the construction safety, OSHA compliance, and training platform for contractors. Every article starts from the primary regulatory text — the CFR section itself, not a summary of it — and is fact-checked against that source before it publishes, so what you read here is what the standard actually requires of small and mid-size contractors in the field.