Heating, ventilation and air-conditioning (HVAC) contractors · Illinois
Oak Brook Mechanical Services, Inc.
Elmhurst, IL · ~52 workers · 5 years of OSHA Injury Tracking Application data.
- F
- Failing Safety Record
- 11.9
- Avg TCR
- 2.8
- Industry avg
- 0
- Fatalities
The verdict
Oak Brook Mechanical Services, Inc. runs at 426% of its industry's injury rate - far more dangerous than the typical Heating, ventilation and air-conditioning (HVAC) contractors workplace, earning a grade F.
- F
- Failing Safety Record
- 11.9
- avg TCR · per 100 workers
- 2.8
- industry benchmark (BLS)
- 26
- recordable injuries tracked
Grade compares Oak Brook Mechanical Services, Inc.'s OSHA Total Case Rate of 11.9 to the Heating, ventilation and air-conditioning (HVAC) contractors BLS benchmark of 2.8 (426% of benchmark) across 5 years of Form 300A filings (2016–2024). <a href="/methodology">See methodology</a> for reporting-limitation caveats.
Injury rate over time
Oak Brook Mechanical Services, Inc.'s yearly Total Case Rate, against the 2.8 industry benchmark.
Where Oak Brook Mechanical Services, Inc. falls in its industry
6,536 Heating, ventilation and air-c establishmentsSafer than 6% of graded establishments in this industry, whose median TCR is 2.8.
Narrower to Illinois alone (the establishments it most directly competes with for workers and contracts): ranked #263 safest of 269 Heating, ventilation and air-c employers in Illinois.
Trend analysis for Oak Brook Mechanical Services, Inc.
Between 2016 and 2019, Oak Brook Mechanical Services, Inc.'s Total Case Rate improved from 18.0 to 11.8 recordable injuries per 100 full-time workers, a 35% decrease across 3 years of OSHA reporting.
The safest year on record was 2017, at a TCR of 8.2, while 2016 saw the highest rate, at 18.0, a spread of 9.7 points between the best and worst reporting years. That's a wide swing relative to the establishment's overall rate, worth checking the year-by-year table below for whether a single severe year is driving the average, rather than a sustained trend.
Summed across those 4 reporting years, Oak Brook Mechanical Services, Inc. recorded 24 total injuries and illnesses, with no fatalities reported in any of those years. Readers comparing establishments should weigh the 4-year trend above alongside establishment size, since a larger workforce naturally accumulates more raw incidents even at a lower per-100-worker rate.
Verify This Employer with OSHA
The 26 injuries shown on this page for Oak Brook Mechanical Services, Inc. are sourced from its own 5 years of mandatory OSHA Form 300A summaries. Cross-check the underlying establishment record directly against the federal source, name, NAICS classification, recordable case totals, and inspection history are all searchable on OSHA's Establishment-Specific Injury and Illness Data system.
Verify on OSHA Establishment SearchSource: U.S. Department of Labor, OSHA Establishment-Specific Injury and Illness Data. NAICS 238220 - Heating, ventilation and air-conditioning (HVAC) contractors.
DART Rate, Transparent Calculation (2024)
What is the DART rate formula?
DART (Days Away, Restricted, or Transferred) is computed by OSHA as incidents × 200,000 ÷ hours worked. The 200,000-hour denominator equals roughly 100 full-time workers, which lets establishments of very different sizes be compared directly.
1 DART incidents × 200,000 ÷ 2,473 hours worked = 80.87 DART
Methodology: 29 CFR 1904, OSHA Form 300A recordkeeping
Cross-Validating Context, Establishment vs Industry vs State
| Benchmark | TCR | Source |
|---|---|---|
| Oak Brook Mechanical Services, Inc. (this establishment) | 11.93 | OSHA ITA Form 300A, 5-year avg |
| Mechanical contractors industry avg | 2.80 | BLS IIF, NAICS 238220 |
| Illinois state avg (all industries) | 4.73 | OSHA ITA, state-level rollup |
Industry benchmarks: Bureau of Labor Statistics, Injuries, Illnesses, and Fatalities (IIF) program
Reportable Incident Timeline
Year-by-year reportable incidents (recordable injuries + illnesses + fatalities) submitted by Oak Brook Mechanical Services, Inc. to OSHA's Injury Tracking Application. Each row anchors to OSHA's inspection records search where you can pull the underlying inspection case numbers and citations for that establishment-year.
- 2024: 2 reportable incidents · 2 injuries, 0 illnesses, 0 fatalities - OSHA inspection records (case numbers)
- 2019: 6 reportable incidents · 6 injuries, 0 illnesses, 0 fatalities - OSHA inspection records (case numbers)
- 2018: 4 reportable incidents · 4 injuries, 0 illnesses, 0 fatalities - OSHA inspection records (case numbers)
- 2017: 4 reportable incidents · 4 injuries, 0 illnesses, 0 fatalities - OSHA inspection records (case numbers)
- 2016: 10 reportable incidents · 10 injuries, 0 illnesses, 0 fatalities - OSHA inspection records (case numbers)
Source: OSHA Inspection Information System (IMIS) - inspection case-number records
Year-by-Year Safety Data
| Year | TCR | DART | Injuries | Illnesses | Fatalities |
|---|---|---|---|---|---|
| 2024 | 161.8 | 80.9 | 2 | 0 | 0 |
| 2019 | 11.8 | 7.8 | 6 | 0 | 0 |
| 2018 | 9.8 | 2.4 | 4 | 0 | 0 |
| 2017 | 8.2 | 0.0 | 4 | 0 | 0 |
| 2016 | 18.0 | 1.8 | 10 | 0 | 0 |
What this grade means for you
Use this grade as a relative read on Oak Brook Mechanical Services, Inc.'s reported OSHA injury record versus its Heating, ventilation and air-conditioning (HVAC) contractors peers, not a verdict on whether any single site is safe today.
- At 426% of the Heating, ventilation and air-conditioning (HVAC) contractors benchmark, Oak Brook Mechanical Services, Inc. reports more injuries than typical peers, ask specifically how the employer is reducing them. Know your rights
- Judge this record against the wider Heating, ventilation and air-conditioning (HVAC) contractors sector, where injury rates vary widely, before comparing it in isolation. See the industry
- Grades reflect 2016–2024 filings; check the latest establishment record straight from OSHA, or look up a different employer. Look up another
Safety grades reflect employers' self-reported OSHA Form 300A filings from 2016 to 2024 and can lag current conditions. A grade is not a guarantee that any specific workplace is safe or unsafe today. See our methodology and disclaimer.
Frequently Asked Questions
What is Oak Brook Mechanical Services, Inc.'s safety grade?
How many injuries has Oak Brook Mechanical Services, Inc. reported?
Similar Employers
Matched by safety record across the industry, by workforce size within Illinois, and by nearby establishments in Elmhurst - a different peer set than the category browse links below.
Similar TCR (~11.9)
Similar size (~52 workers)
Read our methodology - how this data is sourced, computed, and verified.
Every figure and grade on PlainSafetyScore is computed directly from OSHA's published Injury Tracking Application data and BLS industry benchmarks, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these safety grades, or report a data error. Data current as of 2016-2024 OSHA ITA release.