Highway construction · Delaware

Diamond Materials LLC

Newport, DE · ~353 workers · 8 years of OSHA Injury Tracking Application data.

B
Good Safety Record
2.2
Avg TCR
2.8
Industry avg
0
Fatalities
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The verdict

Diamond Materials LLC runs at 78% of its industry's injury rate - safer than the typical Highway construction workplace, earning a grade B.

Diamond Materials LLC: 2.2 TCR = 78% of Highway construction BLS 2.8 · 8y Form 300A (see methodology below)

Diamond Materials LLC safety composite

Diamond Materials LLC scores strongest on total case rate (tcr) (safer than 63% of same-industry peers) and weakest on dart rate (safer than 46%), 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

55/100

Percentile-weighted across 3 of 3 measures

Total Case Rate (TCR)
C 2.18 per 100 workers

Safer than 63% of industry peers

DART rate
D 1.36 per 100 workers

Safer than 46% of industry peers

Fatalities
D 0

Safer than 53% 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

−1.6

2016→2024

Diamond Materials LLC injury rate improved

Diamond Materials LLC's TCR fell 1.6 from 3.0 in 2016 to 1.4 in 2024. Peak filing year was 2018 at 4.0 TCR. In 2024, DART was 0.62× this establishment's average TCR (severity share of cases).

2016=3.0 · 2018=4.0 · 2019=3.3 · 2020=1.6 · 2021=1.4 · 2022=1.7 · 2023=1.0 · 2024=1.4

OSHA ITA Form 300A scorecard

Establishment book 237310 · Newport, DE AT/BELOW-IND · MID

Grade B · TCR 2.2 · 78% of ind

  • DART 1.4 DART
  • RANK #2/13
  • PHOTO McCullough Construct…
  • BOOK 8y book
  • INJ 58 inj
  • SIZE ~353 FTE

Nearest TCR peer: McCullough Construction Inc. (0.0 TCR gap)

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

Diamond Materials LLC in the TCR neighbourhood

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

TCR

What this shows Diamond Materials LLC averages 2.2 TCR (78% of the Highway construction BLS benchmark).

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

Diamond Materials LLC TCR series: 2016=3 · 2018=4 · 2019=3.3 · 2020=1.6 · 2021=1.4 · 2022=1.7 · 2023=1 · 2024=1.4 · BLS 2.8

Where Diamond Materials LLC falls in its industry

4,078 Highway construction establishments

Safer than 63% of graded establishments in this industry, whose median TCR is 3.0.

More dangerous than peersSafer than peers

Narrower to Delaware alone (the establishments it most directly competes with for workers and contracts): ranked #2 safest of 13 Highway construction employers in Delaware.

Diamond Materials LLC (353 employees, TCR 2.2) among 29 same-industry peers, split at the industry median of 69 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 01,0002,0003,000 0102030 Average employees Total Case Rate Diamond Materials LLC
Diamond Materials LLC (353 employees, TCR 2.2) among 29 same-industry peers, split at the industry median of 69 employees and a TCR of 3.0

Diamond Materials LLC has more employees than the Highway construction 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 1.4 1.4 6 0 0
2023 1.0 0.8 4 0 0
2022 1.7 1.7 7 0 0
2021 1.4 1.2 6 0 0
2020 1.6 1.6 6 0 0
2019 3.3 2.3 10 0 0
2018 4.0 2.5 11 0 0
2016 3.0 2.6 8 0 0

OSHA ITA peer cross-reference

Establishment peer ledger

237310 · DE · Newport

4,078 Highway construction employers nationwide with a credible TCR · 1,487 rated employers in Delaware with headcount on file · 11 employers in Newport, DE · 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 McCullough Construction Inc. 2.2 TCR
NAICS-TCR J & N Construction LLC 2.2 TCR
NAICS-TCR METRO EXPRESS INC 2.2 TCR
NAICS-TCR JTL Group Inc. DBA Knife River Belgrade 2.2 TCR
STATE-SIZE 2460 352 FTE
STATE-SIZE 80 VNA (HomeHealth) 354 FTE
STATE-SIZE WM 1736 357 FTE
STATE-SIZE Wilmington HQ 357 FTE
CITY-NEAR Colors and Effects USA LLC 157 FTE
CITY-NEAR BASF Colors & Effects - Newport 154 FTE
CITY-NEAR Air Liquide Advanced Solutions 142 FTE
CITY-NEAR Newport 111 FTE
NAT-TCR Magnum Electric Inc 2.2 TCR
NAT-TCR Brookdale Wooster 2.2 TCR
NAT-TCR Caledonian Alloys 2.2 TCR
NAT-TCR USA New York 310 E 64th St 2.2 TCR
NAT-SIZE Canyon Creek Cabinet Company 353 FTE
NAT-SIZE L3Harris Military Displays - Alpharetta 353 FTE
NAT-SIZE Herman Weissker Inc 353 FTE
NAT-SIZE Mary's Harvest Fresh Foods 353 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, 2021, 2020, 2019, 2018, 2016. 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.