Mechanical contractors · Maryland

Harris Mid-Atlantic, LLC

Name: Harris Mid-Atlantic, LLC Workplace Safety Data
Creator: PlainSafetyScore
License: https://creativecommons.org/publicdomain/zero/1.0/

Upper Marlboro, MD · ~322 workers · 3 years of OSHA Injury Tracking Application data.

Compiled by PlainSafetyScore · August 25, 2026

A
Excellent Safety Record: 0.7
Avg TCR: 2.8
Industry avg: 0
Fatalities

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The verdict

Harris Mid-Atlantic, LLC runs at 25% of its industry's injury rate - far safer than the typical Mechanical contractors workplace, earning a grade A.

Harris Mid-Atlantic, LLC: 0.7 TCR = 25% of Mechanical contractors BLS 2.8 · 3y Form 300A (see methodology below)

Harris Mid-Atlantic, LLC safety composite

Harris Mid-Atlantic, LLC scores strongest on total case rate (tcr) (safer than 93% 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).

70/100

Percentile-weighted across 3 of 3 measures

Total Case Rate (TCR): A 0.7 per 100 workers

Safer than 93% of industry peers
DART rate: C 0.57 per 100 workers

Safer than 58% 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

Harris Mid-Atlantic, LLC: 0.4 → 0.8 TCR

Peak year 2023 @ 0.9 TCR · DART/TCR 0.81× in 2024

Harris Mid-Atlantic, LLC's TCR rose 0.5 from 0.4 in 2022 to 0.8 in 2024. Peak filing year was 2023 at 0.9 TCR. In 2024, DART was 0.81× this establishment's average TCR (severity share of cases).

OSHA ITA Form 300A scorecard

Establishment book 238220 · Upper Marlboro, MD AT/BELOW-IND · MID

Grade A · TCR 0.7 · 25% of ind

DART 0.6 DART
RANK #11/121
PHOTO Nelson Air Device Co…
BOOK 3y book
INJ 7 inj
SIZE ~322 FTE

Nearest TCR peer: Nelson Air Device Corporation (0.0 TCR gap)

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This site

0.7
Nelson Air Dev

0.7
Harris & Hart,

0.7
Mt Storm Power

0.7
TPC Mechanical

0.7

What this shows Harris Mid-Atlantic, LLC averages 0.7 TCR (25% of the Mechanical contractors BLS benchmark).

Harris Mid-Atlantic, LLC TCR series: 2022=0.4 · 2023=0.9 · 2024=0.8 · BLS 2.8

Where Harris Mid-Atlantic, LLC falls in its industry

5,793 Mechanical contractors establishments

Safer than 93% of graded establishments in this industry, whose median TCR is 3.3.

Grade A

More dangerous than peersSafer than peers

Narrower to Maryland alone (the establishments it most directly competes with for workers and contracts): ranked #11 safest of 121 Mechanical contractors employers in Maryland.

Harris Mid-Atlantic, LLC (322 employees, TCR 0.7) among 29 same-industry peers, split at the industry median of 60 employees and a TCR of 3.3

Harris Mid-Atlantic, LLC 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
2024	0.8	0.6	3
2023	0.9	0.0	3
2022	0.4	0.0	1

OSHA ITA peer cross-reference

Establishment peer ledger

238220 · MD · Upper Marlboro

5,793 Mechanical contractors employers nationwide with a credible TCR · 7,213 rated employers in Maryland with headcount on file · 98 employers in Upper Marlboro, MD · 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	Nelson Air Device Corporation	MASPETH, NY	0.7 TCR
NAICS-TCR	Harris & Hart, Inc. - Intel Ocotillo	CHANDLER, AZ	0.7 TCR
NAICS-TCR	Mt Storm Power Station, Bath, Warren, Covanta	MT STORM, WV	0.7 TCR
NAICS-TCR	TPC Mechanical	CARMEL, IN	0.7 TCR
STATE-SIZE	Hughes Network Systems - Manufacturing	GAITHERSBURG	321 FTE
STATE-SIZE	NGMS-T348	LINTHICUM	323 FTE
STATE-SIZE	SUBURBAN MARYLAND_1441079	GAITHERSBURG	323 FTE
STATE-SIZE	MDLAN - LANDOVER	LANDOVER	321 FTE
CITY-NEAR	Washington DC	Upper Marlboro	1,045 FTE
CITY-NEAR	3888 - East Coast Return Center	Upper Marlboro	447 FTE
CITY-NEAR	3881 - Upper Marlboro FDC	Upper Marlboro	431 FTE
CITY-NEAR	Thos. Somerville Co.	Upper Marlboro	368 FTE
NAT-TCR	Harris & Hart, Inc. - Intel Ocotillo	Chandler, AZ	0.7 TCR
NAT-TCR	ROCKWALL	Rockwall, TX	0.7 TCR
NAT-TCR	Metco Reels - A840	Hartselle, AL	0.7 TCR
NAT-TCR	CAES Systems LLC - Lansdale	Lansdale, PA	0.7 TCR
NAT-SIZE	Chevron Pipe Line Company - Houston	Houston, TX	322 FTE
NAT-SIZE	Shoprite of Plainview	Plainview, NY	322 FTE
NAT-SIZE	St Louis Tree	St Louis, MO	322 FTE
NAT-SIZE	Duluth	Duluth, GA	322 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, 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.