Boiler, heating, installation · Iowa

Interstate Mechanical Corp

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

Sioux City, IA · ~71 workers · 3 years of OSHA Injury Tracking Application data.

Compiled by PlainSafetyScore · August 25, 2026

D
Poor Safety Record: 4.3
Avg TCR: 2.8
Industry avg: 0
Fatalities

Subscribe to safety-record updates (RSS)

The verdict

Interstate Mechanical Corp runs at 155% of its industry's injury rate - more dangerous than the typical Boiler, heating, installation workplace, earning a grade D.

Interstate Mechanical Corp: 4.3 TCR = 155% of Boiler, heating, installation BLS 2.8 · 3y Form 300A (see methodology below)

Interstate Mechanical Corp safety composite

Interstate Mechanical Corp scores strongest on fatalities (safer than 51% of same-industry peers) and weakest on dart rate (safer than 20%), 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).

36/100

Percentile-weighted across 3 of 3 measures

Total Case Rate (TCR): D 4.33 per 100 workers

Safer than 40% of industry peers
DART rate: F 4.34 per 100 workers

Safer than 20% 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

2018→2021

Interstate Mechanical Corp injury rate improved

Interstate Mechanical Corp's TCR fell 1.4 from 5.8 in 2018 to 4.3 in 2021. Peak filing year was 2018 at 5.8 TCR. In 2021, DART was 1× this establishment's average TCR (severity share of cases).

2018=5.8 · 2019=2.9 · 2021=4.3

OSHA ITA Form 300A scorecard

Establishment book 238220 · Sioux City, IA ABOVE-IND · SMALL

Grade D · TCR 4.3 · 155% of ind

DART 4.3 DART
RANK #58/94
PHOTO Kruck Plumbing and H…
BOOK 3y book
INJ 9 inj
SIZE ~71 FTE

Nearest TCR peer: Kruck Plumbing and Heating Co, Inc (0.0 TCR gap)

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

This site

4.3
Kruck Plumbing

4.3
3352_6465

4.3
B Z Plumbing C

4.3
ENE SYSTEMS, I

4.3

What this shows Interstate Mechanical Corp averages 4.3 TCR (155% of the Boiler, heating, installation BLS benchmark).

Interstate Mechanical Corp TCR series: 2018=5.8 · 2019=2.9 · 2021=4.3 · BLS 2.8

Where Interstate Mechanical Corp falls in its industry

5,793 Boiler, heating, installation establishments

Safer than 40% of graded establishments in this industry, whose median TCR is 3.3.

Grade D

More dangerous than peersSafer than peers

Narrower to Iowa alone (the establishments it most directly competes with for workers and contracts): ranked #58 safest of 94 Boiler, heating, installation employers in Iowa.

Interstate Mechanical Corp (71 employees, TCR 4.3) among 29 same-industry peers, split at the industry median of 60 employees and a TCR of 3.3

Interstate Mechanical Corp has more employees than the Boiler, heating, installation 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
2021	4.3	4.3	3
2019	2.9	2.9	2
2018	5.8	5.8	4

OSHA ITA peer cross-reference

Establishment peer ledger

238220 · IA · Sioux City

5,793 Boiler, heating, installation employers nationwide with a credible TCR · 7,192 rated employers in Iowa with headcount on file · 259 employers in Sioux City, IA · 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	Kruck Plumbing and Heating Co, Inc	BOONE, IA	4.3 TCR
NAICS-TCR	3352_6465	FRESNO, CA	4.3 TCR
NAICS-TCR	B Z Plumbing Company, Inc.	LINCOLN, CA	4.3 TCR
NAICS-TCR	ENE SYSTEMS, INC.	CANTON, MA	4.3 TCR
STATE-SIZE	Maquoketa Valley Electric Cooperative	ANAMOSA	71 FTE
STATE-SIZE	Peters Construction Corporation	WATERLOO	71 FTE
STATE-SIZE	T & K Roofing & Sheet Metal Company Inc.	ELY	71 FTE
STATE-SIZE	J Pettiecord Inc	BONDURANT	71 FTE
CITY-NEAR	Seaboard Triumph Foods	Sioux City	2,375 FTE
CITY-NEAR	SeaboardTriumph Foods	Sioux City	1,896 FTE
CITY-NEAR	St. Luke's Regional Medical Center	Sioux City	1,201 FTE
CITY-NEAR	Smithfield Packaged Meats Corp	Sioux City	691 FTE
NAT-TCR	HDS-Wilmington	Wilmington, NC	4.3 TCR
NAT-TCR	Hobart Service, Minneapolis	Edina, MN	4.3 TCR
NAT-TCR	Serta Jamestown	Jamestown, NY	4.3 TCR
NAT-TCR	42541a - Aston	Aston, PA	4.3 TCR
NAT-SIZE	Interiors Jessup - Cleveland Construction	Jessup, MD	71 FTE
NAT-SIZE	STA-Little Elm (TEX-750)	Little Elm, TX	71 FTE
NAT-SIZE	Ii-Vi Ms	Starkville, MS	71 FTE
NAT-SIZE	Fire & Life Safety America Corporate Office	Richmond, VA	71 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, 2019, 2018. 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.