Construction management, water and sewer line · California

Mountain Tunnel Constructors, Inc

Sonora, CA · ~51 workers · 2 years of OSHA Injury Tracking Application data.

B
Good Safety Record
1.7
Avg TCR
2.8
Industry avg
0
Fatalities
Subscribe to safety-record updates (RSS)

The verdict

Mountain Tunnel Constructors, Inc runs at 60% of its industry's injury rate - safer than the typical Construction management, water and sewer line workplace, earning a grade B.

Mountain Tunnel Constructors, Inc: 1.7 TCR = 60% of Construction management, water and sewer line BLS 2.8 · 2y Form 300A (see methodology below)

Mountain Tunnel Constructors, Inc safety composite

Mountain Tunnel Constructors, Inc scores strongest on dart rate (safer than 79% of same-industry peers) and weakest on fatalities (safer than 52%), 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

70/100

Percentile-weighted across 3 of 3 measures

Total Case Rate (TCR)
C 1.68 per 100 workers

Safer than 74% of industry peers

DART rate
B 0 per 100 workers

Safer than 79% of industry peers

Fatalities
D 0

Safer than 52% 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%).

Mountain Tunnel Constructors, Inc held a steady TCR band

Mountain Tunnel Constructors, Inc's TCR held near 0.3 from 1.5 in 2023 to 1.8 in 2024. In 2024, DART was 0× this establishment's average TCR (severity share of cases).

2023=1.5 · 2024=1.8

OSHA ITA Form 300A scorecard

Establishment book 237110 · Sonora, CA AT/BELOW-IND · SMALL

Grade B · TCR 1.7 · 60% of ind

  • DART 0.0 DART
  • RANK #53/201
  • PHOTO Johnson-Davis Inc
  • BOOK 2y book
  • INJ 2 inj
  • SIZE ~51 FTE

Nearest TCR peer: Johnson-Davis Inc (0.0 TCR gap)

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

Mountain Tunnel Constructors, Inc in the TCR neighbourhood

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

TCR

What this shows Mountain Tunnel Constructors, Inc averages 1.7 TCR (60% of the Construction management, water and sewer line BLS benchmark).

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

Mountain Tunnel Constructors, Inc TCR series: 2023=1.5 · 2024=1.8 · BLS 2.8

Where Mountain Tunnel Constructors, Inc falls in its industry

1,614 Construction management, water establishments

Safer than 74% of graded establishments in this industry, whose median TCR is 3.0.

More dangerous than peersSafer than peers

Narrower to California alone (the establishments it most directly competes with for workers and contracts): ranked #53 safest of 201 Construction management, water employers in California.

Mountain Tunnel Constructors, Inc (51 employees, TCR 1.7) among 29 same-industry peers, split at the industry median of 54 employees and a TCR of 3.0 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 0100200300400500 051015 Average employees Total Case Rate Mountain Tunnel Constructors, Inc
Mountain Tunnel Constructors, Inc (51 employees, TCR 1.7) among 29 same-industry peers, split at the industry median of 54 employees and a TCR of 3.0

Mountain Tunnel Constructors, Inc has fewer employees than the Construction management, water and sewer median and a lower injury rate than the industry's median TCR of 3.0. 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 1.8 0.0 1 0 0
2023 1.5 1.5 1 0 0

OSHA ITA peer cross-reference

Establishment peer ledger

237110 · CA · Sonora

1,614 Construction management, water and sewer line employers nationwide with a credible TCR · 51,834 rated employers in California with headcount on file · 65 employers in Sonora, CA · 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 Johnson-Davis Inc 1.7 TCR
NAICS-TCR Jack St.Clair Inc. 1.7 TCR
NAICS-TCR Wharton Smith, Inc. 1.7 TCR
NAICS-TCR Matrix5 Site Development 1.7 TCR
STATE-SIZE Robert Young Vineyards 51 FTE
STATE-SIZE H&W Vineyards 51 FTE
STATE-SIZE Huber Farms Inc 51 FTE
STATE-SIZE Taylor Brothers Farms Inc 51 FTE
CITY-NEAR Adventist Health Sonora 1,442 FTE
CITY-NEAR California Department of Transportation Facility 348 779 FTE
CITY-NEAR 9292-AHSR001 - HOSPITAL 511 FTE
CITY-NEAR 2030 350 FTE
NAT-TCR Electronic Control Designs 1.7 TCR
NAT-TCR Altium Packaging - Allentown 1.7 TCR
NAT-TCR Salt Lake City Dry 1.7 TCR
NAT-TCR Coastal Medical 1.7 TCR
NAT-SIZE City of Asheville Community and Economic Development 51 FTE
NAT-SIZE Dch Ford of Eatontown 51 FTE
NAT-SIZE Rock Springs 51 FTE
NAT-SIZE Altium Packaging - Lindon 51 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: 2024, 2023. 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.