Maryland has a specific heat illness regulation: COMAR 09.12.32 (Maryland Occupational Safety and Health). Here is what MOSH requires, what gets cited, and how to close compliance gaps before an inspection.
Maryland's MOSH heat standard applies to construction and outdoor services. High humidity in Maryland/DC metro creates elevated heat index risk even at moderate temperatures. MOSH conducts targeted heat inspections June–September.
"Maryland's COMAR 09.12.32 (Maryland Occupational Safety and Health) applies to all outdoor places of employment — including commercial pressure washing operations. Employers must provide water, shade, rest periods, acclimatization, training, and a written Heat Illness Prevention Plan. Each element is independently citable." Maryland Occupational Safety and Health (MOSH)
These six requirements form the core compliance framework. MOSH inspectors verify each independently. Missing any single element is sufficient grounds for a citation — even if the other five are in place.
| Requirement | What's Required in Maryland |
|---|---|
| Water | Potable cool water at no cost; minimum 1 quart per hour per worker |
| Shade | Shade or cool rest space within reasonable distance; required when heat index ≥91°F |
| Rest Breaks | At least 5-minute rest in cool/shaded area when any employee requests; preventive breaks in high heat |
| Acclimatization | Gradual exposure schedule for new workers; first 7 days supervised |
| Training | Annual training before outdoor season; covers symptoms, emergency procedures, employee rights |
| Written Plan | Written Heat Illness Prevention Plan required with emergency response procedures; must be available at worksite |
MOSH's summer 2024 enforcement campaign resulted in 47 citations to outdoor services contractors in the Baltimore–Washington corridor. A commercial property maintenance company including pressure washing operations received $6,400 in citations for inadequate shade and missing written plan.
Heat illness violations are among the most straightforward citations in OSHA enforcement: the standard is clear, the failure is visible (no shade, empty water jugs, no written plan), and the injury creates automatic scrutiny. Pressure washing contractors are a common target because outdoor work is inherently high-exposure and crew sizes are often small enough that written plans are overlooked.
A written Heat Illness Prevention Plan creates the paper trail that separates a correctable general violation from a serious or willful citation. In Maryland, employers with a written plan who experience a heat illness incident face substantially lower penalty exposure than those without one.
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Get Safety Pack →Yes. COMAR 09.12.32 covers all outdoor workers in Maryland, including pressure washing crews. Maryland's high summer humidity means heat index can exceed 100°F even when air temperature is 85°F — the standard's protections activate based on heat index, not just temperature.
MOSH guidance triggers shade and water access requirements at a heat index of 91°F. At 103°F, high-heat practices including mandatory rest intervals and close monitoring are required.
Maryland MOSH requires annual training before the start of the outdoor work season. New employees must be trained before their first outdoor assignment. Training records must be maintained for a minimum of 3 years.
Serious violations carry up to $7,000 per citation. Willful or repeat violations reach $70,000. MOSH typically issues 2–3 citations per heat-related inspection, meaning a single event can generate $15,000–$21,000 in total penalties.
Other state heat illness guides: