Air-conditioning system (except window) installation · Tennessee

Callahan Mechanical

Chattanooga, TN · ~74 workers · 5 years of OSHA Injury Tracking Application data.

C
Average Safety Record
2.5
Avg TCR
2.8
Industry avg
0
Fatalities
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The verdict

Callahan Mechanical runs at 89% of its industry's injury rate - about level with the typical Air-conditioning system (except window) installation workplace, earning a grade C.

Callahan Mechanical: 2.5 TCR = 89% of Air-conditioning system (except window) installation BLS 2.8 · 5y Form 300A (see methodology below)

Callahan Mechanical safety composite

Callahan Mechanical scores strongest on dart rate (safer than 80% of same-industry peers) and weakest on fatalities (safer than 51%), 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).

C

65/100

Percentile-weighted across 3 of 3 measures

Total Case Rate (TCR)
C 2.5 per 100 workers

Safer than 60% of industry peers

DART rate
B 0 per 100 workers

Safer than 80% 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

−2.9

2016→2021

Callahan Mechanical injury rate improved

Callahan Mechanical's TCR fell 2.9 from 2.9 in 2016 to 0.0 in 2021. Peak filing year was 2018 at 4.2 TCR. In 2021, DART was 0× this establishment's average TCR (severity share of cases).

2016=2.9 · 2018=4.2 · 2019=3.6 · 2020=1.9 · 2021=0.0

OSHA ITA Form 300A scorecard

Establishment book 238220 · Chattanooga, TN AT/BELOW-IND · SMALL

Grade C · TCR 2.5 · 89% of ind

  • DART 0.0 DART
  • RANK #52/117
  • PHOTO G Mechanical, Inc.
  • BOOK 5y book
  • INJ 8 inj
  • SIZE ~74 FTE

Nearest TCR peer: G Mechanical, Inc. (0.0 TCR gap)

Read with this employer → · Industry book → · Tennessee employers → · Look up another →

Callahan Mechanical in the TCR neighbourhood

Average Total Case Rate among this establishment and nearest same-industry peers

TCR

What this shows Callahan Mechanical averages 2.5 TCR (89% of the Air-conditioning system (except window) installation BLS benchmark).

Source U.S. Department of Labor, OSHA Injury Tracking Application (Form 300A) As of 2026-08-25

Callahan Mechanical TCR series: 2016=2.9 · 2018=4.2 · 2019=3.6 · 2020=1.9 · 2021=0 · BLS 2.8

Where Callahan Mechanical falls in its industry

5,793 Air-conditioning system (excep establishments

Safer than 60% of graded establishments in this industry, whose median TCR is 3.3.

More dangerous than peersSafer than peers

Narrower to Tennessee alone (the establishments it most directly competes with for workers and contracts): ranked #52 safest of 117 Air-conditioning system (excep employers in Tennessee.

Callahan Mechanical (74 employees, TCR 2.5) among 29 same-industry peers, split at the industry median of 60 employees and a TCR of 3.3 2×2 strategic matrix plotting 30 entities by Average employees (X) and Total Case Rate (Y), with a crosshair dividing the plot into four quadrants. Larger & higher-riskSmaller & higher-riskLarger & saferSmaller & safer than peers 050100150200250 05101520 Average employees Total Case Rate Callahan Mechanical
Callahan Mechanical (74 employees, TCR 2.5) among 29 same-industry peers, split at the industry median of 60 employees and a TCR of 3.3

Callahan Mechanical has more employees than the Air-conditioning system (except window) median and a lower 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
2021 0.0 0.0 0 0 0
2020 1.9 1.9 1 0 0
2019 3.6 0.0 2 0 0
2018 4.2 0.0 3 0 0
2016 2.9 0.0 2 0 0

OSHA ITA peer cross-reference

Establishment peer ledger

238220 · TN · Chattanooga

5,793 Air-conditioning system (except window) installation employers nationwide with a credible TCR · 10,743 rated employers in Tennessee with headcount on file · 695 employers in Chattanooga, TN · 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 G Mechanical, Inc. 2.5 TCR
NAICS-TCR Integrated Facility Services 2.5 TCR
NAICS-TCR DAVCON INC. 2.5 TCR
NAICS-TCR Accurate Mechanical Contractors, Inc. 2.5 TCR
STATE-SIZE Middle Tennessee Electric (Rutherford County Office) 74 FTE
STATE-SIZE Arcus Restoration 74 FTE
STATE-SIZE Grinder, Taber and Grinder, Inc. 74 FTE
STATE-SIZE Reese Enterprises Inc 74 FTE
CITY-NEAR CHATTANOOGA COKE 8,650 FTE
CITY-NEAR CHATTANOOGA FOOD 8,650 FTE
CITY-NEAR USXpress 7,385 FTE
CITY-NEAR Cardiology GB 6,606 FTE
NAT-TCR Maiden Rock 2.5 TCR
NAT-TCR Miller Bowie Supply 2.5 TCR
NAT-TCR Arizona Avenue 2.5 TCR
NAT-TCR Branch CSA - Coca Cola Parts 2.5 TCR
NAT-SIZE WLC 74 FTE
NAT-SIZE Valassis Direct Mail, Inc. 74 FTE
NAT-SIZE Refa Steel Erectors 74 FTE
NAT-SIZE Washington Equipment Manufacturing Company, Inc. dna WEMCO 74 FTE

Rel codes: NAICS-TCR · STATE-SIZE · CITY-NEAR · NAT-TCR/NAT-SIZE cross-state. Read with this employer →

Data Source: OSHA Injury Tracking Application (ITA), mandatory establishment-level injury/illness reports. Grades compare employer Total Case Rate (TCR) to BLS IIF industry benchmarks. Data covers years reported by this establishment: 2021, 2020, 2019, 2018, 2016. This is publicly available government data - not a legal determination of workplace conditions.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from official public datasets. See our methodology for details.