Heating, ventilation and air-conditioning (HVAC) contractors · Minnesota
Tonna Mechanical Inc
Rochester, MN · ~83 workers · 4 years of OSHA Injury Tracking Application data.
- F
- Failing Safety Record
- 12.3
- Avg TCR
- 2.8
- Industry avg
- 0
- Fatalities
The verdict
Tonna Mechanical Inc runs at 438% of its industry's injury rate - far more dangerous than the typical Heating, ventilation and air-conditioning (HVAC) contractors workplace, earning a grade F.
Tonna Mechanical Inc: 12.3 TCR = 438% of Heating, ventilation and air-conditioning (HVAC) contractors BLS 2.8 · 4y Form 300A (see methodology below)
Tonna Mechanical Inc safety composite
Tonna Mechanical Inc scores strongest on fatalities (safer than 51% of same-industry peers) and weakest on dart rate (safer than 5%), blended into one 0-100 breakdown against same-industry peers. A missing measure drops out and redistributes its weight rather than deflating the score. This is a per-dimension breakdown, distinct from the single letter grade above it (which weights TCR alone against the BLS industry benchmark).
17/100
Percentile-weighted across 3 of 3 measures
- Total Case Rate (TCR)
- F 12.27 per 100 workers
Safer than 6% of industry peers
- DART rate
- F 9.43 per 100 workers
Safer than 5% of industry peers
- Fatalities
- D 0
Safer than 51% of industry peers
Benchmarked live against every credibly-rated employer in the same NAICS industry code in the current OSHA extract (a segment must have at least 8 rated peers to benchmark). Not a legal or compliance determination; PlainSafetyScore's own weighting (TCR 40%, DART 35%, fatalities 25%).
TCR Δ
−0.8
2021→2024
Tonna Mechanical Inc injury rate improved
Tonna Mechanical Inc's TCR fell 0.8 from 14.9 in 2021 to 14.2 in 2024. Peak filing year was 2021 at 14.9 TCR. In 2024, DART was 0.77× this establishment's average TCR (severity share of cases).
2021=14.9 · 2022=12.2 · 2023=7.8 · 2024=14.2
OSHA ITA Form 300A scorecard
Establishment book 238220 · Rochester, MN ABOVE-IND · SMALL
Grade F · TCR 12.3 · 438% of ind
- DART 9.4 DART
- RANK #140/153
- PHOTO United Heating Cooli…
- BOOK 4y book
- INJ 41 inj
- SIZE ~83 FTE
Nearest TCR peer: United Heating Cooling & Plumbing (0.0 TCR gap)
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Tonna Mechanical Inc in the TCR neighbourhood
Average Total Case Rate among this establishment and nearest same-industry peers
- This site
Tonna Mechanical Inc
12.3 TCR
- United Heating
United Heating Cooling & Plumbing
12.3 TCR
- Water Medic of
Water Medic of Cape Coral Inc.
12.3 TCR
- Air Hawk Heati
Air Hawk Heating and Cooling LLC
12.3 TCR
- JR Putman Inc
JR Putman Inc
12.3 TCR
What this shows Tonna Mechanical Inc averages 12.3 TCR (438% of the Heating, ventilation and air-conditioning (HVAC) contractors BLS benchmark).
Tonna Mechanical Inc TCR series: 2021=14.9 · 2022=12.2 · 2023=7.8 · 2024=14.2 · BLS 2.8
Where Tonna Mechanical Inc falls in its industry
5,793 Heating, ventilation and air-c establishmentsSafer than 6% of graded establishments in this industry, whose median TCR is 3.3.
Narrower to Minnesota alone (the establishments it most directly competes with for workers and contracts): ranked #140 safest of 153 Heating, ventilation and air-c employers in Minnesota.
Tonna Mechanical Inc has more employees than the Heating, ventilation and air-conditionin median and a higher injury rate than the industry's median TCR of 3.3. Workforce size and injury rate do not always move together within the same industry -- some of its smaller peers run higher rates than its larger ones, and vice versa.
Year-by-Year Safety Data
| Year | TCR | DART | Injuries | Illnesses | Fatalities |
|---|---|---|---|---|---|
| 2024 | 14.2 | 9.4 | 12 | 0 | 0 |
| 2023 | 7.8 | 6.5 | 6 | 0 | 0 |
| 2022 | 12.2 | 1.1 | 11 | 0 | 0 |
| 2021 | 14.9 | 7.5 | 12 | 0 | 0 |
OSHA ITA peer cross-reference
Establishment peer ledger
238220 · MN · Rochester
5,793 Heating, ventilation and air-conditioning (HVAC) contractors employers nationwide with a credible TCR · 15,828 rated employers in Minnesota with headcount on file · 290 employers in Rochester, MN · 4 cross-state NAT-TCR peers · 4 cross-state NAT-SIZE peers. Closest matches by relationship code are listed below.
| Rel | Establishment | Metric |
|---|---|---|
| NAICS-TCR | United Heating Cooling & Plumbing | 12.3 TCR |
| NAICS-TCR | Water Medic of Cape Coral Inc. | 12.3 TCR |
| NAICS-TCR | Air Hawk Heating and Cooling LLC | 12.3 TCR |
| NAICS-TCR | JR Putman Inc | 12.3 TCR |
| STATE-SIZE | King Gen Plant-PD | 83 FTE |
| STATE-SIZE | MVEC | 83 FTE |
| STATE-SIZE | Hy-Tec Construction of Brainerd, Inc. | 83 FTE |
| STATE-SIZE | J&D Construction, Inc. | 83 FTE |
| CITY-NEAR | Mayo Clinic Rochester | 38,233 FTE |
| CITY-NEAR | Olmsted County | 1,304 FTE |
| CITY-NEAR | Mayo Collaborative Services, LLC | 1,051 FTE |
| CITY-NEAR | FEDERAL BUREAU OF PRISONS | 823 FTE |
| NAT-TCR | Cold Mountain Builders | 12.3 TCR |
| NAT-TCR | Townview Health and Rehabilitaion Center | 12.3 TCR |
| NAT-TCR | Lake Elsinore | 12.3 TCR |
| NAT-TCR | CK Composites Co., LLC | 12.3 TCR |
| NAT-SIZE | Willimantic Waste - Sprague | 83 FTE |
| NAT-SIZE | Lake Emory Post Acute Care | 83 FTE |
| NAT-SIZE | Nissan Motor Corporation in Guam | 83 FTE |
| NAT-SIZE | Tentcraft LLC | 83 FTE |
Rel codes: NAICS-TCR · STATE-SIZE · CITY-NEAR · NAT-TCR/NAT-SIZE cross-state. Read with this employer →
Read our methodology - how this data is sourced, computed, and verified.