Mechanical contractors · Wisconsin

Dillett Mechanical Service, Inc.

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

Waukesha, WI · ~45 workers · 2 years of OSHA Injury Tracking Application data.

Compiled by PlainSafetyScore · August 25, 2026

F
Failing Safety Record: 5.7
Avg TCR: 2.8
Industry avg: 0
Fatalities

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The verdict

Dillett Mechanical Service, Inc. runs at 204% of its industry's injury rate - far more dangerous than the typical Mechanical contractors workplace, earning a grade F.

Dillett Mechanical Service, Inc.: 5.7 TCR = 204% of Mechanical contractors BLS 2.8 · 2y Form 300A (see methodology below)

Dillett Mechanical Service, Inc. safety composite

Dillett Mechanical Service, Inc. scores strongest on fatalities (safer than 51% of same-industry peers) and weakest on dart rate (safer than 10%), 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).

28/100

Percentile-weighted across 3 of 3 measures

Total Case Rate (TCR): F 5.72 per 100 workers

Safer than 29% of industry peers
DART rate: F 6.62 per 100 workers

Safer than 10% 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%).

Rising injury rate

Dillett Mechanical Service, Inc.: 4.8 → 6.6 TCR

Peak year 2023 @ 6.6 TCR · DART/TCR 1.16× in 2023

Dillett Mechanical Service, Inc.'s TCR rose 1.8 from 4.8 in 2022 to 6.6 in 2023. In 2023, DART was 1.16× this establishment's average TCR (severity share of cases).

OSHA ITA Form 300A scorecard

Establishment book 238220 · Waukesha, WI ABOVE-IND · SMALL

Grade F · TCR 5.7 · 204% of ind

DART 6.6 DART
RANK #99/154
PHOTO Phillips Plumbing an…
BOOK 2y book
INJ 5 inj
SIZE ~45 FTE

Nearest TCR peer: Phillips Plumbing and Mechanical (0.0 TCR gap)

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

This site

5.7
Phillips Plumb

5.7
NP Mechanical

5.7
PGMA, LLC d/b/

5.7
Thermal Tech T

5.7

What this shows Dillett Mechanical Service, Inc. averages 5.7 TCR (204% of the Mechanical contractors BLS benchmark).

Dillett Mechanical Service, Inc. TCR series: 2022=4.8 · 2023=6.6 · BLS 2.8

Where Dillett Mechanical Service, Inc. falls in its industry

5,793 Mechanical contractors establishments

Safer than 29% of graded establishments in this industry, whose median TCR is 3.3.

Grade F

More dangerous than peersSafer than peers

Narrower to Wisconsin alone (the establishments it most directly competes with for workers and contracts): ranked #99 safest of 154 Mechanical contractors employers in Wisconsin.

Dillett Mechanical Service, Inc. (45 employees, TCR 5.7) among 29 same-industry peers, split at the industry median of 60 employees and a TCR of 3.3

Dillett Mechanical Service, Inc. has fewer employees than the Mechanical contractors 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
2023	6.6	6.6	3	0	0
2022	4.8	0.0	2	0	0

OSHA ITA peer cross-reference

Establishment peer ledger

238220 · WI · Waukesha

5,793 Mechanical contractors employers nationwide with a credible TCR · 12,834 rated employers in Wisconsin with headcount on file · 285 employers in Waukesha, WI · 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	Phillips Plumbing and Mechanical	BERTHOUD, CO	5.7 TCR
NAICS-TCR	NP Mechanical Inc.	CORONA, CA	5.7 TCR
NAICS-TCR	PGMA, LLC d/b/a Action Air Conditioning, Heating and Solar Loc 1	SAN MARCOS, CA	5.7 TCR
NAICS-TCR	Thermal Tech Tampa	TAMPA, FL	5.7 TCR
STATE-SIZE	Denmark Dairy LLC	COLFAX	45 FTE
STATE-SIZE	Plover #205 Farms	PLOVER	45 FTE
STATE-SIZE	Ocean Spray Cranberries, Inc	BABCOCK	45 FTE
STATE-SIZE	Babcock, WI Receiving Station	BABCOCK	45 FTE
CITY-NEAR	Waukesha Memorial Hospital	Waukesha	2,210 FTE
CITY-NEAR	Generac-Waukesha	Waukesha	1,387 FTE
CITY-NEAR	GEHC : Waukesha WI (WSO), HCS	Waukesha	1,384 FTE
CITY-NEAR	Generac Power Systems, Inc.	Waukesha	1,090 FTE
NAT-TCR	Main Office	Davenport, IA	5.7 TCR
NAT-TCR	031-ROE Ellsinore	Ellsinore, MO	5.7 TCR
NAT-TCR	Hickory Point Christian Village	Forsyth, IL	5.7 TCR
NAT-TCR	Ameritech Millworks	Grand Prairie, TX	5.7 TCR
NAT-SIZE	POET Biorefining Gowrie	Gowrie, IA	45 FTE
NAT-SIZE	Fremont Millwork Co.	Klamath Falls, OR	45 FTE
NAT-SIZE	Lake House Academy	Flat Rock, NC	45 FTE
NAT-SIZE	Eugene	Springfield, OR	45 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: 2023, 2022. 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.