Mechanical contractors · California

Peterson Mechanical Inc.

Name: Peterson Mechanical Inc. Workplace Safety Data
Creator: PlainSafetyScore
License: https://creativecommons.org/publicdomain/zero/1.0/

Sonoma, CA · ~118 workers · 2 years of OSHA Injury Tracking Application data.

Compiled by PlainSafetyScore · September 26, 2026

C
Average Safety Record: 3.0
Avg TCR: 2.8
Industry avg: 0
Fatalities

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The verdict

Peterson Mechanical Inc. runs at 107% of its industry's injury rate - about level with the typical Mechanical contractors workplace, earning a grade C.

Peterson Mechanical Inc.: 3.0 TCR = 107% of Mechanical contractors BLS 2.8 · 2y Form 300A (see methodology below)

Peterson Mechanical Inc. safety composite

Peterson Mechanical Inc. scores strongest on total case rate (tcr) (safer than 54% of same-industry peers) and weakest on dart rate (safer than 36%), 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).

47/100

Percentile-weighted across 3 of 3 measures

Total Case Rate (TCR): D 3 per 100 workers

Safer than 54% of industry peers
DART rate: D 2.33 per 100 workers

Safer than 36% 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

−1.4

2017→2021

Peterson Mechanical Inc. injury rate improved

Peterson Mechanical Inc.'s TCR fell 1.4 from 3.7 in 2017 to 2.3 in 2021. Peak filing year was 2017 at 3.7 TCR. In 2021, DART was 0.78× this establishment's average TCR (severity share of cases).

2017=3.7 · 2021=2.3

OSHA ITA Form 300A scorecard

Establishment book 238220 · Sonoma, CA ABOVE-IND · MID

Grade C · TCR 3.0 · 107% of ind

DART 2.3 DART
RANK #235/594
PHOTO Tao Mechanical LTD
BOOK 2y book
INJ 7 inj
SIZE ~118 FTE

Nearest TCR peer: Tao Mechanical LTD (0.0 TCR gap)

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

This site

3
Tao Mechanical

3
Harry Caswell,

3
Smith Mechanic

3
Briarcliff

3

What this shows Peterson Mechanical Inc. averages 3.0 TCR (107% of the Mechanical contractors BLS benchmark).

Peterson Mechanical Inc. TCR series: 2017=3.7 · 2021=2.3 · BLS 2.8

Where Peterson Mechanical Inc. falls in its industry

5,793 Mechanical contractors establishments

Safer than 54% of graded establishments in this industry, whose median TCR is 3.3.

Grade C

More dangerous than peersSafer than peers

Narrower to California alone (the establishments it most directly competes with for workers and contracts): ranked #235 safest of 594 Mechanical contractors employers in California.

Peterson Mechanical Inc. (118 employees, TCR 3.0) among 29 same-industry peers, split at the industry median of 60 employees and a TCR of 3.3

Peterson Mechanical Inc. has more employees than the Mechanical contractors 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	2.3	2.3	3	0	0
2017	3.7	2.8	4	0	0

OSHA ITA peer cross-reference

Establishment peer ledger

238220 · CA · Sonoma

5,793 Mechanical contractors employers nationwide with a credible TCR · 51,834 rated employers in California with headcount on file · 55 employers in Sonoma, CA · 4 cross-state NAT-TCR peers · 4 cross-state NAT-SIZE peers. Closest matches by relationship code are listed below.

Rel	Establishment	Place	Metric
NAICS-TCR	Tao Mechanical LTD	LIVERMORE, CA	3.0 TCR
NAICS-TCR	Harry Caswell, INC.	MILLDBORO, DE	3.0 TCR
NAICS-TCR	Smith Mechanical, Inc.	LAWRENCEVILLE, GA	3.0 TCR
NAICS-TCR	Briarcliff	BRIARCLIFF MANOR, NY	3.0 TCR
STATE-SIZE	Central Kitchen Brea	BREA	118 FTE
STATE-SIZE	Benchmark Arrowhead, LLC	LAKE ARROWHEAD	118 FTE
STATE-SIZE	Silverado Beverly Place - 215	LOS ANGELES	118 FTE
STATE-SIZE	El Camino Gardens	CARMICHAEL	118 FTE
CITY-NEAR	Sonoma Valley Hospital	Sonoma	386 FTE
CITY-NEAR	Fairmont Sonoma Mission Inn & Spa	Sonoma	350 FTE
CITY-NEAR	Artisan Bakers	Sonoma	216 FTE
CITY-NEAR	The Renaissance Lodge at Sonoma	Sonoma	180 FTE
NAT-TCR	Corporate	Elgin, TX	3.0 TCR
NAT-TCR	Frank's Home Office	Fort Myers, FL	3.0 TCR
NAT-TCR	McWane Ductile - New Jersey	Phillipsburg, NJ	3.0 TCR
NAT-TCR	Southern Division Auburn Crew Headquarters	Auburn, AL	3.0 TCR
NAT-SIZE	Edwardsville	Edwardsville, KS	118 FTE
NAT-SIZE	Edgecombe Health and Rehabilitation Center	Tarboro, NC	118 FTE
NAT-SIZE	Blue Heron Elementary School	Lino Lakes, MN	118 FTE
NAT-SIZE	Brookwood Skilled Nursing and Therapy	Okc, OK	118 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, 2017. 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.