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Employers › CA

Mining, Quarrying, Oil & Gas · Corona, CA

Robertson's Ready Mix INC

According to OSHA enforcement records (2010–2026), Robertson's Ready Mix INC has a mixed safety record: 15 violations across 9 inspections. See the full breakdown below.

Lower half by penalty0% serious
$4,810
OSHA penalties
15
Violations cited
9
OSHA inspections
#57,040
of 100,495 penalized employers

Robertson's Ready Mix INC in Corona, CA has been the subject of 9 OSHA workplace inspections and 15 citations since 2010, according to enforcement records from the U.S. Department of Labor. Total penalties assessed: $4,810. All enforcement data below is sourced from the DOL public enforcement databases at data.dol.gov.

The record in one line

OSHA has inspected Robertson's Ready Mix INC 9 times over 9 years, roughly annually. These inspections resulted in 15 violations, averaging 1.7 per inspection. Its total OSHA penalty ranks in the lower half of penalized employers nationally. Against the Mining, Quarrying, Oil & Gas industry average of 2 inspections per employer, this runs well above peers (4.2x the sector average) on inspection frequency. For comparison, Udelhoven in Nikiski, AK is another mining, quarrying, oil & gas employer with 4 OSHA inspections on record and $4,845 in current penalties.

1.7
violations per inspection
0.0%
of violations were serious
43%
of penalized employers rank lower

How Robertson's Ready Mix INC compares on OSHA penalties

Total current penalty vs the Mining, Quarrying, Oil & Gas per-employer average

in penalties

What this shows Robertson's Ready Mix INC sits roughly in line with peers (1.1x the sector average) in total OSHA penalties.

Source U.S. Department of Labor, OSHA enforcement extracts As of 2026

Where this penalty ranks nationally

Total current OSHA penalty vs every U.S. employer with a nonzero penalty

$4,810 Top 43% most affordable more affordable than 57% of 100,495 U.S. employers with a penalty

$0–$5,000: 44,435 U.S. employers with a penalty (44%). This entry sits in this band. $5,000–$10,000: 20,628 U.S. employers with a penalty (21%). Above this entry. $10,000–$15,000: 11,165 U.S. employers with a penalty (11%). Above this entry. $15,000–$20,000: 6,629 U.S. employers with a penalty (7%). Above this entry. $20,000–$25,000: 4,205 U.S. employers with a penalty (4%). Above this entry. $25,000–$30,000: 2,885 U.S. employers with a penalty (3%). Above this entry. $30,000–$35,000: 2,052 U.S. employers with a penalty (2%). Above this entry. $35,000–$40,000: 1,483 U.S. employers with a penalty (1%). Above this entry. $40,000–$45,000: 1,120 U.S. employers with a penalty (1%). Above this entry. $45,000–$50,000: 792 U.S. employers with a penalty (1%). Above this entry. $50,000–$55,000: 5,101 U.S. employers with a penalty (5%). Above this entry. This employer $0 $55,000 every penalized U.S. employer, bucketed by value

Each bar is a $5K-wide band; taller bars hold more U.S. employers with a penalty. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.

Source U.S. Department of Labor, OSHA enforcement extracts · 2026

What the Data Says About Robertson's Ready Mix INC

The federal enforcement record for Robertson's Ready Mix INC in Corona, CA includes 9 OSHA inspections and 15 violations, translating to 1.67 violations per inspection. Of those violations, 0 (0.0%) were classified as serious, 0 (0.0%) as willful, and 0 (0.0%) as repeat.

OSHA assessed $4,810 in initial penalties against this employer, later adjusted to a current total of $4,810 - no reduction from the original assessment. Average penalty per inspection works out to $534. Against the Mining, Quarrying, Oil & Gas industry average of $4,394 per employer, this record sits roughly in line with peers (1.1x the sector average).

Inspection activity spans from 2015-11-09 to 2024-08-21, a window of roughly 9 years.

Enforcement detail

OSHA Inspection History

Total Inspections

9

First Inspection

2015-11-09

Last Inspection

2024-08-21

Inspection Span

9 yrs

Violations / Inspection

1.7

Avg Penalty / Inspection

$534

Industry Avg / Inspection

$2,034

What this shows 9 inspections over 9 years, averaging 1.7 violations per visit. That's $534 per inspection vs. the Mining, Quarrying, Oil & Gas average of $2,034.

Enforcement detail

Violation Breakdown

0

Serious

0.0% of total

0

Willful

0.0% of total

0

Repeat

0.0% of total

15

Other-Than-Serious

100.0% of total

What this shows Serious violations involve hazards that could cause death or serious physical harm. Willful violations indicate intentional or knowing disregard of the law. Repeat violations are for hazards previously cited within the past 5 years.

Enforcement detail

Penalty Analysis

Initial Penalty Assessed

$4,810

Current Penalty Amount

$4,810

Penalty Reduction

None

What this shows No reduction on record. The current penalty matches the original OSHA assessment.

Industry Safety Context: Mining, Quarrying, Oil & Gas

How Robertson's Ready Mix INC compares to the Mining, Quarrying, Oil & Gas sector, which has 2,359 employers tracked by PlainWorker.

Metric Robertson's Ready Mix INC Industry Avg
Inspections 9 2.2
Violations 15 3.1
Total Penalty $4,810 $4,394
Avg Penalty per Inspection $534 $2,034
View all 2,359 employers in Mining, Quarrying, Oil & Gas →

Nearby & Similar Employers in Mining, Quarrying, Oil & Gas

Lane Construction
Charlotte, NC
0 inspections $0
Dywidag Systems International
Cambridge, OH
2 inspections $4,800
J & J Pipe and Supply, Inc.
Ganado, TX
0 inspections $0
Maverick Drilling, LLC
Medicine Lodge, KS
2 inspections $4,844
Udelhoven
Nikiski, AK
4 inspections $4,845

Compare Robertson's Ready Mix INC vs Lane Construction side-by-side →

Frequently Asked Questions

Is Robertson's Ready Mix INC safe to work at? ▼
Based on OSHA records, Robertson's Ready Mix INC's workplace safety record is mixed, with some compliance concerns. The employer has 15 violations across 9 inspections. Compared to Mining, Quarrying, Oil & Gas industry peers, this is above average for penalties. Review the full inspection history below for details.
How many OSHA violations does Robertson's Ready Mix INC have? ▼
Robertson's Ready Mix INC has 15 OSHA violations on record, including 0 serious, 0 willful, and 0 repeat violations. The total current penalty amount is $4,810.
How many OSHA inspections has Robertson's Ready Mix INC had? ▼
Robertson's Ready Mix INC has had 9 OSHA inspections, with the first recorded on 2015-11-09 and the most recent on 2024-08-21. This averages 1.7 violations per inspection.
What is the total penalty amount for Robertson's Ready Mix INC? ▼
Robertson's Ready Mix INC has been assessed $4,810 in current OSHA penalties.
What industry does Robertson's Ready Mix INC operate in? ▼
Robertson's Ready Mix INC operates in the Mining, Quarrying, Oil & Gas sector (NAICS code 212313). This industry has 2,359 employers tracked by PlainWorker, with 5,096 total OSHA inspections and $10.36M in cumulative penalties.
How does Robertson's Ready Mix INC's safety record compare to industry average? ▼
Robertson's Ready Mix INC's total OSHA penalty of $4,810 is above the Mining, Quarrying, Oil & Gas industry average of $4,394 per employer (1.1x the average). The employer has 9 inspections compared to the industry average of 2.2 per employer. For a direct comparison, Udelhoven in Nikiski, AK is a similar mining, quarrying, oil & gas employer with $4,845 in current penalties.

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Mining, Quarrying, Oil & Gas Industry

All 2,359 employers in this sector
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Safety Rankings

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What to check next

Robertson's Ready Mix INC's record is one establishment in a larger pattern. Use it as a research checklist, not a verdict on the employer overall.

These figures are the federal enforcement record on file and reflect past inspections, not a statement about current workplace conditions. See the disclaimer for how to read them.

Data Sources & Methodology ▼

Data as of 2026. Source: U.S. Department of Labor (OSHA, WHD).

Source: OSHA Enforcement Data

Inspection and violation records from the Occupational Safety and Health Administration (OSHA), U.S. Department of Labor, covering the period 2010–2026. Includes inspection dates, violation types (serious, willful, repeat, other-than-serious), and penalty amounts. Penalties shown are current assessed amounts and may differ from original citations due to settlement, contest, or reduction.

Source: Wage and Hour Division (WHD)

Compliance actions from the WHD, covering enforcement of the Fair Labor Standards Act (FLSA), including minimum wage, overtime, and child labor violations. Back wages represent amounts owed to affected employees as determined by WHD investigations.

Employer Matching

Employers are matched across OSHA and WHD datasets by name, state, and city. Employers included in PlainWorker have 2 or more OSHA inspections or $1,000+ in WHD back wages. Data is updated monthly from data.dol.gov.

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Every figure on PlainWorker is rendered directly from official U.S. Department of Labor OSHA and Wage & Hour Division enforcement records, no number is typed in by an editor. This employer's ratios (penalty-per-violation, industry comparisons) are computed live from the 9 inspections on record. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2026.