OSHA 29 CFR 1926.1153 Silica Standard

What 1926.1153 covers and who it applies to

OSHA 29 CFR 1926.1153 is the silica standard for construction. It governs occupational exposure to respirable crystalline silica (quartz, cristobalite, tridymite) generated by construction tasks — concrete grinding, cutting and coring, tuckpointing, demolition, and any operation that disturbs materials containing more than trace amounts of crystalline silica. Construction employers whose workers may be exposed to silica at or above the action level of 25 µg/m³ during an 8-hour TWA must comply.

The standard applies to all construction work covered by 29 CFR 1926 where employees may be exposed to respirable crystalline silica. It does not apply to operations where employee exposures will remain below 25 µg/m³ as an 8-hour TWA under any foreseeable conditions. Operations covered include but are not limited to: cutting, sawing, drilling, crushing, loading, hauling, or storing materials that contain crystalline silica; abrasive blasting with silica-containing materials or on surfaces that contain silica; and tuckpointing or grinding silica-containing mortar.

Why crystalline silica exposure matters

Respirable crystalline silica — particles 10 µm and smaller that penetrate to the alveolar region of the lung — causes silicosis (an irreversible, potentially fatal fibrotic lung disease), lung cancer, chronic obstructive pulmonary disease (COPD), and kidney disease. OSHA estimates that about 2.3 million construction workers are exposed to crystalline silica on the job. The 2017 standard reduced the construction PEL from 250 µg/m³ (the prior OSHA standard under the 1971 Z-tables) to 50 µg/m³ — a fivefold reduction — based on epidemiological evidence that the prior limit failed to prevent silicosis over a working lifetime.

Relationship to 1910.134 and 1926.103

1926.1153 is a substance-specific standard. It overlays the respiratory protection requirements of 29 CFR 1926.103 and 29 CFR 1910.134 with silica-specific exposure limits, Table 1 engineering control prescriptions, medical surveillance triggers, and recordkeeping requirements. Any employer complying with 1926.1153's respiratory protection requirements is also satisfying 1910.134 for silica — but the reverse is not necessarily true. When 1926.1153 and 1910.134 conflict, 1926.1153 controls as the more specific standard.

The three compliance options

1926.1153(c) gives construction employers three routes to compliance. The route chosen determines what air monitoring, documentation, and respiratory protection is required. Most small and medium construction operations use Table 1.

Option A — Table 1 (§1926.1153(c)(1))

For the 18 construction tasks listed in Table 1 of the standard, employers who fully implement the specified engineering controls, work practices, and (where required by Table 1) respiratory protection are deemed in compliance with the PEL for those tasks — without conducting air monitoring. This is the practical default for most construction employers. No air monitoring, no WECP required for Table 1 tasks that are fully controlled per the table. The tradeoff: the engineering controls must be implemented fully and correctly; a Table 1 employer who runs a grinder without the required LEV system cannot claim Table 1 compliance and must instead treat the operation as uncontrolled air-monitoring exposure.

Option B — Objective data (§1926.1153(c)(2))

Employers may rely on objective data — historical air monitoring data, published industry studies, or manufacturer data — demonstrating that a particular task, with a particular material and specific conditions, will not result in employee exposures at or above the action level of 25 µg/m³. Objective data must be specific enough to the actual task, material, and conditions to be credible. Generic "silica data" for a task class is insufficient. Objective data that satisfies this option exempts the employer from air monitoring and Table 1 requirements for those specific operations, but must be documented and made available to OSHA on request.

Option C — Scheduled monitoring (§1926.1153(c)(3))

Employers not using Table 1 or objective data must conduct air monitoring to assess employee exposures. Initial monitoring must use personal sampling. Results determine the required response: if at or above the action level (25 µg/m³) but below the PEL (50 µg/m³), repeat monitoring within 6 months; if at or above the PEL, repeat within 3 months and implement all required controls including respiratory protection. Monitoring may be discontinued when two consecutive measurements taken ≥7 days apart are below the action level.

Table 1: specified tasks and required controls

Table 1 of 1926.1153 lists 18 categories of construction tasks, the engineering and work practice controls required for each, and whether respiratory protection is required even when controls are fully implemented. The primary engineering control for most tasks is Local Exhaust Ventilation (LEV) paired with a high-efficiency (HEFi) vacuum — a vacuum with a filter rated at 99% or greater efficiency at 0.3 µm. Wet methods — applying sufficient water to the cut or grind point to suppress dust — are an alternative where Table 1 specifies them.

How to read the decode table: "Controls required" is what the employer must use. "Respiratory protection — Table 1 compliance" is whether a respirator is required when controls are fully implemented. "Respiratory protection — controls absent" is what is required if the employer cannot or does not implement the specified controls and must instead rely on air monitoring results to drive respirator selection.

Note: This decode table summarizes Table 1 representative task categories. The actual Table 1 in 29 CFR 1926.1153 contains 18 rows with precise equipment and control specifications. Employers must consult the actual OSHA Table 1 for the exact task description matching their operation. Where a task does not appear in Table 1, the employer must use Option B (objective data) or Option C (air monitoring).

For tuckpointing and jackhammer operations where Table 1 requires respiratory protection, a 3M full-face APR with a 3M 2091 P100 filter is the standard specification, providing APF 50 and P100 particulate efficiency — well above the minimum required half-face specification for those tasks. See the 3M 2091 P100 respirator filter review for performance detail.

Written Exposure Control Plan (WECP)

Under §1926.1153(g), employers who operate under Option C air monitoring — or whose operations include tasks beyond the Table 1 scope — must develop and implement a Written Exposure Control Plan (WECP) for all operations where employees may be exposed to silica above the action level. The WECP is a project-specific document, not a generic program statement.

Required WECP elements

Per §1926.1153(g)(1), the WECP must include:

1. A description of each task in the workplace that involves exposure to respirable crystalline silica
2. A description of the engineering controls, work practices, and respiratory protection used to limit employee exposure for each task
3. A description of the housekeeping measures used to limit employee exposure
4. A description of the procedures used to restrict access to work areas to minimize the number of employees exposed to silica and their level of exposure

The WECP must be made available to all affected employees and must be updated whenever there is a change in task type, materials, equipment, or control measures that may affect the level of exposure. Unlike the OSHA 1910.134 Written Respiratory Protection Program (WRPP), the WECP does not need to cover respirator selection methodology, fit testing, or medical evaluation — those remain in the WRPP under 1910.134. The two documents must be consistent: if the WECP specifies P100 respiratory protection for a given operation, the WRPP must document those respirators as the selected equipment for that operation.

WECP for Table 1 operations

Strictly speaking, a WECP is not required solely for Table 1 operations — Table 1 compliance is deemed sufficient without additional documentation of exposure controls for those specific tasks. However, many safety professionals develop a WECP for all silica-generating tasks regardless of compliance route, to create a single auditable document showing how each operation is controlled. This is consistent with the ANSI/ASSP Z88.2 recommendation for comprehensive written hazard control documentation.

Designated competent person

§1926.1153(d)(2) requires the employer to designate a competent person to make frequent and regular inspections of job sites, materials, and equipment to implement the written exposure control plan — before beginning work covered by Table 1. The competent person definition comes from 29 CFR 1926.32(f): an individual capable of identifying existing and predictable silica hazards who has authorization to take prompt corrective measures.

Practical requirements for the competent person role under 1926.1153:

• Must understand Table 1 task categories and required engineering controls for each
• Must be able to verify that LEV/HEFi vacuum systems are operating correctly (filter condition, connection at point of generation, airflow adequate)
• Must be able to identify deviations from Table 1 controls (dry cutting where wet method required, missing shroud on jackhammer, damaged HEPA filter)
• Must have authority to stop the operation if controls are not in place — not merely authority to "report" the issue to a supervisor
• For Table 1 operations with required respiratory protection, must verify correct respirator type, seal check, and user fit-test status

No specific training credential is required for the competent person designation under 1926.1153 — OSHA has not specified a minimum certification. However, designating an individual who lacks the technical knowledge to recognize a malfunctioning LEV system is a citation risk if OSHA inspects and finds the controls are inadequate while the "competent person" was present. Practical training programs such as OSHA 30-hour Construction, NIOSH silica awareness courses, or manufacturer-provided LEV equipment training provide an auditable basis for the designation.

Medical surveillance

§1926.1153(h) requires medical surveillance for employees who are subject to the standard and who are exposed above the action level of 25 µg/m³ for 30 or more days per year. The 30-day threshold counts any day of exposure above the AL, regardless of task type or duration of that specific task on a given day.

Timing requirements

• Initial examination: Within 30 days of initial assignment to a task with potential AL exposure, unless the employee has had a compliant exam within the past 3 years.
• Periodic examinations: Every 3 years for employees who remain in the surveillance trigger group.
• Termination-of-assignment examination: Within 30 days of the end of assignment, if the employee has not had an exam in the past 3 years.

Medical examination components

Each medical exam must be provided by a PLHCP and must include:

1. Occupational and medical history, including silica and other dust exposures, smoking history, and history of respiratory symptoms or disease
2. Physical examination with emphasis on the respiratory system
3. Chest X-ray — posterior-anterior projection, size B or larger film, interpreted by a NIOSH-certified B-reader
4. Pulmonary function testing — spirometry (FVC and FEV₁) following ATS standardization criteria
5. Latent tuberculosis infection (LTBI) test — for employees working in environments where they could be exposed to LTBI from other workers
6. Any other tests deemed appropriate by the PLHCP

The PLHCP provides a written medical opinion to the employer stating whether the employee has any detected medical conditions that would place the employee at increased risk from further silica exposure, and whether any limitations on respirator use are recommended. The employer must provide a copy to the employee within 30 days. Medical records must be maintained for the duration of employment plus 30 years under §1910.1020.

Housekeeping

§1926.1153(f) prohibits work practices that increase exposure unnecessarily. The most commonly cited provision is the ban on dry sweeping or dry brushing of surfaces where silica dust has accumulated. Dry methods disperse settled respirable silica back into the breathing zone; wet sweeping, vacuuming with a HEPA-filtered vacuum, or equivalent methods that capture rather than disperse settled dust are required instead.

Additional housekeeping provisions under 1926.1153(f):

• Compressed air must not be used to clean clothing or surfaces where silica dust is present, unless LEV captures the released dust or no other alternative is available and appropriate respiratory protection and protective clothing are used
• Eating, drinking, smoking, chewing tobacco or gum, and applying cosmetics must be prohibited in areas where employees are exposed to silica above the PEL
• Employees must wash their hands and faces before eating, drinking, or using tobacco products after working with silica-containing materials

HEPA-filtered vacuums used for housekeeping must meet the same filtration standard as those used in LEV control systems — 99% or greater efficiency at 0.3 µm. A regular shop vacuum without HEPA filtration does not satisfy the standard and represents a common Table 1 compliance failure.

Recordkeeping

§1926.1153(i) imposes retention periods on three categories of records:

All records must be made available to OSHA, NIOSH, and affected employees (and their designated representatives) per 1910.1020. The WECP itself does not have a specified retention period under 1926.1153 but must be kept current and accessible. Best practice is to treat the WECP as a living project document — update it at each project phase change, maintain it for the life of the project, and archive it for 3 years after project completion.

Related reference

See also the complete OSHA section index — the frozen-edition table, and why “ANSI compliant” and “OSHA compliant” are not the same thing.

Closely related on this site: when does osha require a respirator, ANSI/ASSP Z88.2 Respiratory Protection Program Standard, as nzs 1716 australian respirator standard, and csa z94 4 canadian respirator standard.

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Our methodology

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Researched and written by Steven Eaton, editor of WC Safety. Steven holds no safety certification and does not test products; this page compares what manufacturers and regulators publish, with the gaps in that record marked. Last reviewed August 2026.

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