Footing and foundation concrete contractors · California

Cornerstone Concrete, Inc.

Corona, CA · ~81 workers · 5 years of OSHA Injury Tracking Application data.

F
Failing Safety Record
11.0
Avg TCR
2.8
Industry avg
0
Fatalities
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The verdict

Cornerstone Concrete, Inc. runs at 392% of its industry's injury rate - far more dangerous than the typical Footing and foundation concrete contractors workplace, earning a grade F.

Cornerstone Concrete, Inc.: 11.0 TCR = 392% of Footing and foundation concrete contractors BLS 2.8 · 5y Form 300A (see methodology below)

Cornerstone Concrete, Inc. safety composite

Cornerstone Concrete, Inc. scores strongest on fatalities (safer than 51% of same-industry peers) and weakest on dart rate (safer than 6%), 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).

F

18/100

Percentile-weighted across 3 of 3 measures

Total Case Rate (TCR)
F 10.97 per 100 workers

Safer than 9% of industry peers

DART rate
F 9.64 per 100 workers

Safer than 6% 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

Cornerstone Concrete, Inc.: 6.4 → 9.6 TCR

Peak year 2021 @ 15.2 TCR · DART/TCR 0.88× in 2024

Cornerstone Concrete, Inc.'s TCR rose 3.3 from 6.4 in 2020 to 9.6 in 2024. Peak filing year was 2021 at 15.2 TCR. In 2024, DART was 0.88× this establishment's average TCR (severity share of cases).

OSHA ITA Form 300A scorecard

Establishment book 238110 · Corona, CA ABOVE-IND · SMALL

Grade F · TCR 11.0 · 392% of ind

  • DART 9.6 DART
  • RANK #144/166
  • PHOTO Everett Concrete LLC
  • BOOK 5y book
  • INJ 45 inj
  • SIZE ~81 FTE

Nearest TCR peer: Everett Concrete LLC (0.0 TCR gap)

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

Cornerstone Concrete, Inc. in the TCR neighbourhood

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

TCR

What this shows Cornerstone Concrete, Inc. averages 11.0 TCR (392% of the Footing and foundation concrete contractors BLS benchmark).

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

Cornerstone Concrete, Inc. TCR series: 2020=6.4 · 2021=15.2 · 2022=10.6 · 2023=13 · 2024=9.6 · BLS 2.8

Where Cornerstone Concrete, Inc. falls in its industry

1,314 Footing and foundation concret establishments

Safer than 9% of graded establishments in this industry, whose median TCR is 3.8.

More dangerous than peersSafer than peers

Narrower to California alone (the establishments it most directly competes with for workers and contracts): ranked #144 safest of 166 Footing and foundation concret employers in California.

Cornerstone Concrete, Inc. (81 employees, TCR 11.0) among 29 same-industry peers, split at the industry median of 64 employees and a TCR of 3.8 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 0100200300 051015 Average employees Total Case Rate Cornerstone Concrete, Inc.
Cornerstone Concrete, Inc. (81 employees, TCR 11.0) among 29 same-industry peers, split at the industry median of 64 employees and a TCR of 3.8

Cornerstone Concrete, Inc. has more employees than the Footing and foundation concrete contract median and a higher injury rate than the industry's median TCR of 3.8. 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 9.6 9.6 7 0 0
2023 13.0 10.4 10 0 0
2022 10.6 7.4 10 0 0
2021 15.2 12.3 16 0 0
2020 6.4 4.8 2 2 0

OSHA ITA peer cross-reference

Establishment peer ledger

238110 · CA · Corona

1,314 Footing and foundation concrete contractors employers nationwide with a credible TCR · 51,834 rated employers in California with headcount on file · 409 employers in Corona, CA · 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 Everett Concrete LLC 11.0 TCR
NAICS-TCR Rick Hamm Construction, Inc. 11.0 TCR
NAICS-TCR Troy Forming Concrete Inc. 11.0 TCR
NAICS-TCR MONTANO CONCRETE CORP 11.0 TCR
STATE-SIZE Allied Potato Inc. 81 FTE
STATE-SIZE STS Ranch LLC 81 FTE
STATE-SIZE C. R CRAIN AND SONS, INC 81 FTE
STATE-SIZE Miramar 81 FTE
CITY-NEAR Monster Energy Company 2535 Anselmo Dr 2,572 FTE
CITY-NEAR Monster Energy Company 2,388 FTE
CITY-NEAR Monster Energy Company - Anselmo Dr, Corona 2,335 FTE
CITY-NEAR California Department of Transportation Facility 289 1,587 FTE
NAT-TCR US Foods Milwaukee 11.0 TCR
NAT-TCR Bullard Logistics, LLC 11.0 TCR
NAT-TCR BATHMASTERS 11.0 TCR
NAT-TCR Trillium Farms Croton Pullet 1 11.0 TCR
NAT-SIZE I Squared R Element Co., Inc. 81 FTE
NAT-SIZE 174 Kehrs Mill 81 FTE
NAT-SIZE 743 Farmington 81 FTE
NAT-SIZE Red Wing Shoe Co. - SBF Lower 81 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. 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.