Boilers (e.g., heating, hot water, power, steam) merchant wholesalers · California

Riverside Winnelson Co.

Name: Riverside Winnelson Co. Workplace Safety Data
Creator: PlainSafetyScore
License: https://creativecommons.org/publicdomain/zero/1.0/

Grand Terrace, CA · ~27 workers · 8 years of OSHA Injury Tracking Application data.

Compiled by PlainSafetyScore · August 25, 2026

F
Failing Safety Record: 6.3
Avg TCR: 2.2
Industry avg: 0
Fatalities

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The verdict

Riverside Winnelson Co. runs at 285% of its industry's injury rate - far more dangerous than the typical Boilers (e.g., heating, hot water, power, steam) merchant wholesalers workplace, earning a grade F.

Riverside Winnelson Co.: 6.3 TCR = 285% of Boilers (e.g., heating, hot water, power, steam) merchant wholesalers BLS 2.2 · 8y Form 300A (see methodology below)

Riverside Winnelson Co. safety composite

Riverside Winnelson Co. scores strongest on fatalities (safer than 50% of same-industry peers) and weakest on dart rate (safer than 12%), 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).

24/100

Percentile-weighted across 3 of 3 measures

Total Case Rate (TCR): F 6.27 per 100 workers

Safer than 18% of industry peers
DART rate: F 6.61 per 100 workers

Safer than 12% of industry peers
Fatalities: D 0

Safer than 50% 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

Riverside Winnelson Co.: 0.0 → 6.6 TCR

Peak year 2018 @ 30.6 TCR · DART/TCR 1.05× in 2024

Riverside Winnelson Co.'s TCR rose 6.6 from 0.0 in 2017 to 6.6 in 2024. Peak filing year was 2018 at 30.6 TCR. In 2024, DART was 1.05× this establishment's average TCR (severity share of cases).

OSHA ITA Form 300A scorecard

Establishment book 423720 · Grand Terrace, CA ABOVE-IND · SMALL

Grade F · TCR 6.3 · 285% of ind

DART 6.6 DART
RANK #64/85
PHOTO MLAG
BOOK 8y book
INJ 9 inj
SIZE ~27 FTE

Nearest TCR peer: MLAG (0.0 TCR gap)

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6.3
MLAG

6.3
Winsupply Taco

6.3
Torrco Waterbu

6.3
1936 Fairway D

6.3

What this shows Riverside Winnelson Co. averages 6.3 TCR (285% of the Boilers (e.g., heating, hot water, power, steam) merchant wholesalers BLS benchmark).

Riverside Winnelson Co. TCR series: 2017=0 · 2018=30.6 · 2019=6.8 · 2020=6.1 · 2021=0 · 2022=0 · 2023=0 · 2024=6.6 · BLS 2.2

Where Riverside Winnelson Co. falls in its industry

853 Boilers (e.g., heating, hot wa establishments

Safer than 18% of graded establishments in this industry, whose median TCR is 3.3.

Grade F

More dangerous than peersSafer than peers

Narrower to California alone (the establishments it most directly competes with for workers and contracts): ranked #64 safest of 85 Boilers (e.g., heating, hot wa employers in California.

Riverside Winnelson Co. (27 employees, TCR 6.3) among 29 same-industry peers, split at the industry median of 38 employees and a TCR of 3.3

Riverside Winnelson Co. has fewer employees than the Boilers (e.g., heating, hot water, power median and a higher 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	6.6	6.6	2
2023	0.0	0.0	0
2022	0.0	0.0	0
2021	0.0	0.0	0
2020	6.1	6.1	2
2019	6.8	6.8	2
2018	30.6	20.4	3
2017	0.0	0.0	0

OSHA ITA peer cross-reference

Establishment peer ledger

423720 · CA · Grand Terrace

853 Boilers (e.g., heating, hot water, power, steam) merchant wholesalers employers nationwide with a credible TCR · 51,834 rated employers in California with headcount on file · 8 employers in Grand Terrace, 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	MLAG	OREM, UT	6.3 TCR
NAICS-TCR	Winsupply Tacoma WA Co.	TACOMA, WA, WA	6.3 TCR
NAICS-TCR	Torrco Waterbury	WATERBURY, CT	6.3 TCR
NAICS-TCR	1936 Fairway Dr	SAN LEANDRO, CA	6.3 TCR
STATE-SIZE	HQ	FRESNO	27 FTE
STATE-SIZE	Medeiros Farms Vineyards	CARUTHERS	27 FTE
STATE-SIZE	SAND RANCH	HELM	27 FTE
STATE-SIZE	San Bernabe Vineyards	KING CITY	27 FTE
CITY-NEAR	Grand Terrace Health Care Center	Grand Terrace	117 FTE
CITY-NEAR	WCA Riverside	Grand Terrace	79 FTE
CITY-NEAR	CA-Vista Substation	Grand Terrace	44 FTE
CITY-NEAR	Vista Blue Mountain	Grand Terrace	43 FTE
NAT-TCR	King Kullen #39	Garden City Park, NY	6.3 TCR
NAT-TCR	LNH-Bayside	Virginia Beach, VA	6.3 TCR
NAT-TCR	Grand Traverse County	Traverse City, MI	6.3 TCR
NAT-TCR	Thurston Woods Village Inc.	Sturgis, MI	6.3 TCR
NAT-SIZE	Grow Out	Gainesville, GA	27 FTE
NAT-SIZE	Superior Communications - TN 2	La Vergne, TN	27 FTE
NAT-SIZE	Location 51001	Sioux Falls, SD	27 FTE
NAT-SIZE	Sahling Kenworth - York	York, NE	27 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, 2017. 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.