Mail and Parcel Delivery · California

Diamond Bar_1440491

Name: Diamond Bar_1440491 Workplace Safety Data
Creator: PlainSafetyScore
License: https://creativecommons.org/publicdomain/zero/1.0/

Diamond Bar, CA · ~50 workers · 2 years of OSHA Injury Tracking Application data.

Compiled by PlainSafetyScore · August 25, 2026

D
Poor Safety Record: 5.5
Avg TCR: 4.5
Industry avg: 0
Fatalities

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The verdict

Diamond Bar_1440491 runs at 123% of its industry's injury rate - more dangerous than the typical Mail and Parcel Delivery workplace, earning a grade D.

Diamond Bar_1440491: 5.5 TCR = 123% of Mail and Parcel Delivery BLS 4.5 · 2y Form 300A (see methodology below)

Diamond Bar_1440491 safety composite

Diamond Bar_1440491 scores strongest on dart rate (safer than 80% 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).

67/100

Percentile-weighted across 3 of 3 measures

Total Case Rate (TCR): C 5.52 per 100 workers

Safer than 65% of industry peers
DART rate: B 2.16 per 100 workers

Safer than 80% 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

−6.7

2023→2024

Diamond Bar_1440491 injury rate improved

Diamond Bar_1440491's TCR fell 6.7 from 8.9 in 2023 to 2.2 in 2024. Peak filing year was 2023 at 8.9 TCR. In 2024, DART was 0.39× this establishment's average TCR (severity share of cases).

2023=8.9 · 2024=2.2

OSHA ITA Form 300A scorecard

Establishment book 491110 · Diamond Bar, CA ABOVE-IND · SMALL

Grade D · TCR 5.5 · 123% of ind

DART 2.2 DART
RANK #466/1240
PHOTO GUAYNABO_1433949
BOOK 2y book
INJ 5 inj
SIZE ~50 FTE

Nearest TCR peer: GUAYNABO_1433949 (0.0 TCR gap)

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

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5.5
GUAYNABO_14339

5.5
AUBURN_1353647

5.5
336225-ORANGE

5.5
519805-WINCHES

5.5

What this shows Diamond Bar_1440491 averages 5.5 TCR (123% of the Mail and Parcel Delivery BLS benchmark).

Diamond Bar_1440491 TCR series: 2023=8.9 · 2024=2.2 · BLS 4.5

Where Diamond Bar_1440491 falls in its industry

13,818 Mail and Parcel Delivery establishments

Safer than 65% of graded establishments in this industry, whose median TCR is 6.8.

Grade D

More dangerous than peersSafer than peers

Narrower to California alone (the establishments it most directly competes with for workers and contracts): ranked #466 safest of 1240 Mail and Parcel Delivery employers in California.

Diamond Bar_1440491 (50 employees, TCR 5.5) among 29 same-industry peers, split at the industry median of 51 employees and a TCR of 6.8

Diamond Bar_1440491 has fewer employees than the Mail and Parcel Delivery median and a lower injury rate than the industry's median TCR of 6.8. 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	2.2	2.2	1	0	0
2023	8.9	6.7	4	0	0

OSHA ITA peer cross-reference

Establishment peer ledger

491110 · CA · Diamond Bar

13,818 Mail and Parcel Delivery employers nationwide with a credible TCR · 51,834 rated employers in California with headcount on file · 27 employers in Diamond Bar, CA · 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	GUAYNABO_1433949	GUAYNABO, PR	5.5 TCR
NAICS-TCR	AUBURN_1353647	AUBURN, MA	5.5 TCR
NAICS-TCR	336225-ORANGE PO	ORANGE, NJ	5.5 TCR
NAICS-TCR	519805-WINCHESTER PO	WINCHESTER, VA	5.5 TCR
STATE-SIZE	Jack Bros., Inc.	BRAWLEY	50 FTE
STATE-SIZE	M Three Ranches, LLC	WOODLAND	50 FTE
STATE-SIZE	Penterman Farming Company	NAPA	50 FTE
STATE-SIZE	Trefethen Farming, LLC	NAPA	50 FTE
CITY-NEAR	California Department of Transportation Facility 1	Diamond Bar	2,621 FTE
CITY-NEAR	Niagara Bottling, LLC - Corporate	Diamond Bar	1,424 FTE
CITY-NEAR	Ono-CORP	Diamond Bar	961 FTE
CITY-NEAR	South Coast Air Quality Management District	Diamond Bar	798 FTE
NAT-TCR	ACA-Tennessee	Dickson, TN	5.5 TCR
NAT-TCR	Jessup Md	Jessup, MD	5.5 TCR
NAT-TCR	SOFIE - Sanford	Sanford, FL	5.5 TCR
NAT-TCR	Ingram Barge Company Columbus	Paducah, KY	5.5 TCR
NAT-SIZE	IntelliEPI-Allen	Allen, TX	50 FTE
NAT-SIZE	Evans & Associates Construction Company	Ponca City, OK	50 FTE
NAT-SIZE	Desimone Logistics LLC	Munroe Falls, OH	50 FTE
NAT-SIZE	Ennis, Inc.	Midlothian, TX	50 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. 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.