Employer · California

Mason RC

Chatsworth, CA · ~18 workers · 5 years of OSHA Injury Tracking Application data.

F
Failing Safety Record
9.8
Avg TCR
3.2
Industry avg
0
Fatalities
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The verdict

Mason RC runs at 307% of its industry's injury rate - far more dangerous than the typical industry workplace, earning a grade F.

Mason RC: 9.8 TCR = 307% of industry BLS 3.2 · 5y Form 300A (see methodology below)

Mason RC safety composite

Mason RC scores strongest on fatalities (safer than 51% of same-industry peers) and weakest on dart rate (safer than 7%), 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

22/100

Percentile-weighted across 3 of 3 measures

Total Case Rate (TCR)
F 9.82 per 100 workers

Safer than 18% of industry peers

DART rate
F 13.42 per 100 workers

Safer than 7% 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

−8.8

2020→2024

Mason RC injury rate improved

Mason RC's TCR fell 8.8 from 22.2 in 2020 to 13.4 in 2024. Peak filing year was 2020 at 22.2 TCR. In 2024, DART was 1.37× this establishment's average TCR (severity share of cases).

2020=22.2 · 2021=0.0 · 2022=13.4 · 2023=0.0 · 2024=13.4

OSHA ITA Form 300A scorecard

Establishment book 924120 · Chatsworth, CA ABOVE-IND · SMALL

Grade F · TCR 9.8 · 307% of ind

  • DART 13.4 DART
  • RANK #67/96
  • PHOTO St Clair Shores Park…
  • BOOK 5y book
  • INJ 3 inj
  • SIZE ~18 FTE

Nearest TCR peer: St Clair Shores Parks/Rec/Senior Center (0.0 TCR gap)

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

Mason RC in the TCR neighbourhood

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

TCR

What this shows Mason RC averages 9.8 TCR (307% of the industry BLS benchmark).

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

Mason RC TCR series: 2020=22.2 · 2021=0 · 2022=13.4 · 2023=0 · 2024=13.4 · BLS 3.2

Where Mason RC falls in its industry

413 industry establishments

Safer than 18% of graded establishments in this industry, whose median TCR is 5.0.

More dangerous than peersSafer than peers

Narrower to California alone (the establishments it most directly competes with for workers and contracts): ranked #67 safest of 96 industry employers in California.

Mason RC (18 employees, TCR 9.8) among 29 same-industry peers, split at the industry median of 69 employees and a TCR of 5.0 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 0200400600800 051015 Average employees Total Case Rate Mason RC
Mason RC (18 employees, TCR 9.8) among 29 same-industry peers, split at the industry median of 69 employees and a TCR of 5.0

Mason RC has fewer employees than the industry median and a higher injury rate than the industry's median TCR of 5.0. 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 13.4 13.4 1 0 0
2023 0.0 0.0 0 0 0
2022 13.4 13.4 1 0 0
2021 0.0 0.0 0 0 0
2020 22.2 22.2 1 0 0

OSHA ITA peer cross-reference

Establishment peer ledger

924120 · CA · Chatsworth

413 industry employers nationwide with a credible TCR · 51,834 rated employers in California with headcount on file · 132 employers in Chatsworth, CA · 4 cross-state NAT-TCR peers. Closest matches by relationship code are listed below.

Rel Establishment Metric
NAICS-TCR St Clair Shores Parks/Rec/Senior Center 9.8 TCR
NAICS-TCR Paris Mountain State Park 9.9 TCR
NAICS-TCR PARKS REC FACILITIES 9.9 TCR
NAICS-TCR EI054 - Camp Ripley Enforcement Center 9.7 TCR
STATE-SIZE Henry Hibino Farms LLC 18 FTE
STATE-SIZE BATAVIA, INC. 18 FTE
STATE-SIZE Gold Coast Farms 18 FTE
STATE-SIZE HM.CLAUSE Davis East Research Station 18 FTE
CITY-NEAR Thibiant International 666 FTE
CITY-NEAR AMZL : DLA4 620 FTE
CITY-NEAR Noble House Home Furnishings 562 FTE
CITY-NEAR kdc/ one 540 FTE
NAT-TCR Ready Mix Plant 20 9.8 TCR
NAT-TCR Behlen Mfg. Co. 9.8 TCR
NAT-TCR R.K. Hydro-Vac, PA, Inc 9.8 TCR
NAT-TCR Saint Luke's Hospital of Kansas City's Crittenton Children's Center 9.8 TCR

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.