Fifty micrograms per cubic meter. That is the OSHA permissible exposure limit (PEL) for respirable crystalline silica under 29 CFR 1910.1053, the general industry standard that took effect in 2018. A worker sweeping a concrete floor in a masonry products plant with a dry push broom can generate air concentrations three times that limit within minutes of starting. The NIOSH silica topic page documents measured air concentrations from dry sweeping in industrial settings that routinely exceed the PEL. There is no treatment for silicosis. The housekeeping method is the preventive measure.
The standard also establishes an action level (AL) of 25 µg/m3, at which medical surveillance obligations begin. The 2026 penalty ceiling is $16,550 per Serious violation and $165,514 per Willful or Repeat. Employers who continue to permit dry sweeping in areas with known silica-containing dust after receiving a citation have been assessed Willful penalties in OSHA enforcement cases.
What the Standard Requires
1910.1053 requires employers to either use specified exposure control methods from Table 1 (for listed tasks) or assess actual employee exposures using air monitoring. For housekeeping tasks, the standard specifies at 1910.1053(f)(1) that employers must not allow dry sweeping or dry brushing where the task would expose employees to silica unless wet sweeping or HEPA-filter-equipped vacuuming is infeasible.
| Requirement | Specific Obligation | CFR Section |
|---|---|---|
| Housekeeping method restriction | Prohibit dry sweeping and dry brushing unless wet methods and HEPA vacuuming are infeasible | 1910.1053(f)(1) |
| Exposure Control Plan (ECP) | Written ECP identifying tasks involving silica exposure, engineering controls, and work practices | 1910.1053(f)(2) |
| Exposure assessment | Initial assessment of each employee's silica exposure; reassess when changes occur | 1910.1053(d) |
| Medical surveillance | For workers exposed at or above AL for 30 or more days/year: initial and periodic chest X-ray and pulmonary function | 1910.1053(i) |
| Respiratory protection | Required where engineering controls cannot maintain exposure below PEL | 1910.1053(f)(3) |
| Training | Annual training covering health effects, exposure controls, and ECP content | 1910.1053(j) |
| Recordkeeping | Exposure records: 30 years; medical surveillance records: 30 years post-employment | 1910.1053(l) |
The ECP requirement at 1910.1053(f)(2) is not a checklist. It must be a facility-specific document that describes each task in the workplace that exposes workers to respirable crystalline silica, identifies the engineering controls and work practices used for each task, and is reviewed and updated at least annually. A generic template with blanks filled in does not satisfy this requirement.
Who It Applies To
The standard applies to general industry employers whose workers may be exposed to RCS at or above the action level of 25 µg/m3. Facility types where cleaning crews face silica exposure include concrete and masonry manufacturing, ceramic and refractory product plants, foundries, glass manufacturing, construction material supply facilities, and mining support operations. Cleaning contractors in office buildings or retail spaces are unlikely to encounter silica at relevant concentrations. The exposure exists specifically where the building materials being processed or the industrial process generates silica-containing dust.
What the Inspector Looks At
An OSHA silica inspection typically starts with a review of the ECP and exposure monitoring records. The inspector will then walk the facility to observe housekeeping practices firsthand. Dry sweeping in an area with concrete dust or visible silica-containing material residue will result in an immediate citation.
| Inspector Check | Common Deficiency | Citation Risk |
|---|---|---|
| Dry sweeping practice | Dry brooms used in areas with silica-containing dust; no documented infeasibility analysis for wet methods | Serious, $16,550 |
| Written ECP | No ECP; ECP is generic template without facility-specific tasks | Serious, $16,550 |
| Air monitoring records | No baseline exposure assessment; assessment not updated after process changes | Serious |
| Medical surveillance | Workers exposed at or above AL for 30+ days/year with no medical surveillance program | Serious |
| HEPA vacuum specification | Vacuums used for silica-containing dust not equipped with HEPA filtration | Serious |
| Training records | Annual silica training not documented; workers cannot describe ECP contents | Serious |
Common Citations and What They Cost
The most common silica citation for cleaning operations is 1910.1053(f)(1): dry sweeping in areas with silica-containing dust without documenting infeasibility of wet methods. OSHA enforcement data shows this citation typically carries the Serious classification at $16,550. When paired with 1910.1053(f)(2) (no written ECP), the grouped citation total can reach $33,100 for a single site inspection. Employers in manufacturing and masonry operations who receive initial citations and fail to abate have faced Repeat designations and penalty assessments approaching the $165,514 ceiling per violation in subsequent inspections.
Tradeoffs and Operator Reality
The switch from dry to wet sweeping or HEPA vacuuming is not free. HEPA-equipped industrial vacuums suitable for RCS work start around $800 to $1,200 per unit and require regular filter inspection and replacement. Wet sweeping in areas where dry dust is the norm introduces a slip hazard, requiring wet floor controls under 1910.22. For a BSC taking on a concrete products plant account, the compliance cost should appear in the bid as a line item, not absorbed into the standard janitorial rate. The SOW should specify the vacuuming equipment type and the wet-method protocol. Clients who insist on using their own dry-sweeping crews alongside the BSC's wet methods create a co-exposure scenario the BSC must document clearly to avoid being cited for hazards they did not introduce.
What to Put in the SOW and Training Matrix
The SOW for any account with confirmed or potential silica exposure should specify the housekeeping methods to be used (wet methods and/or HEPA-equipped vacuums), the equipment specifications, and the requirement that the contractor maintain a written ECP covering all silica-exposure tasks at the account. Training records must show annual completion for all workers performing housekeeping tasks in silica-exposure areas, and must include the specific content required by 1910.1053(j): health effects of silica, methods to protect against exposure, and the ECP content relevant to the worker's tasks.
The PPE selector maps respirator requirements for silica exposures above the PEL where engineering controls are insufficient. For the parallel HazCom obligations that apply to silica-containing materials, see OSHA HazCom 1910.1200 for Cleaning Operations. For the noise exposures that often co-occur in industrial facilities with silica hazards, see OSHA Noise 1910.95 for Cleaning Equipment. Full compliance reference at Opora Compliance Library.
The OSHA crystalline silica topic page provides the standard text, Table 1 for construction-analogous tasks, and a small entity compliance guide. The eCFR text of 1910.1053 is the regulatory source. The Federal Register final rule for 1910.1053 (2016) provides the full regulatory preamble and rationale for the PEL and action level. For industrial cleaning programs where silica exposure is a primary concern, see the industrial cleaning vertical hub.
By the Opora Editorial Team · Last updated: 2026