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Employers › NV

Construction · Las Vegas, NV

Mammoth Underground, LLC

According to OSHA enforcement records (2010–2026), Mammoth Underground, LLC has a concerning safety record: 5 violations across 8 inspections. See the full breakdown below.

Top 10% by penalty80% serious
$31,683
OSHA penalties
5
Violations cited
8
OSHA inspections
#9,764
of 100,495 penalized employers

Mammoth Underground, LLC in Las Vegas, NV has been the subject of 8 OSHA workplace inspections and 5 citations since 2010, according to enforcement records from the U.S. Department of Labor. Total penalties assessed: $31,683. All enforcement data below is sourced from the DOL public enforcement databases at data.dol.gov.

The record in one line

OSHA has inspected Mammoth Underground, LLC 8 times over 13 years, roughly once every couple of years. These inspections resulted in 5 violations, averaging 0.6 per inspection, on the lighter side. Its total OSHA penalty ranks in the top 10% of penalized employers nationally. Of these, 4 were classified as serious - indicating hazards that could cause death or serious harm. Against the Construction industry average of 2 inspections per employer, this runs well above peers (4.0x the sector average) on inspection frequency. For comparison, Nan INC in Ewa Beach, HI is another construction employer with 2 OSHA inspections on record and $31,696 in current penalties.

0.6
violations per inspection
80.0%
of violations were serious
90%
of penalized employers rank lower

How Mammoth Underground, LLC compares on OSHA penalties

Total current penalty vs the Construction per-employer average

in penalties

What this shows Mammoth Underground, LLC runs well above peers (4.7x 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

$31,683 Bottom 10% least affordable more affordable than 10% of 100,495 U.S. employers with a penalty

$0–$5,000: 44,435 U.S. employers with a penalty (44%). Below this entry. $5,000–$10,000: 20,628 U.S. employers with a penalty (21%). Below this entry. $10,000–$15,000: 11,165 U.S. employers with a penalty (11%). Below this entry. $15,000–$20,000: 6,629 U.S. employers with a penalty (7%). Below this entry. $20,000–$25,000: 4,205 U.S. employers with a penalty (4%). Below this entry. $25,000–$30,000: 2,885 U.S. employers with a penalty (3%). Below this entry. $30,000–$35,000: 2,052 U.S. employers with a penalty (2%). This entry sits in this band. $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 Mammoth Underground, LLC

The federal enforcement record for Mammoth Underground, LLC in Las Vegas, NV includes 8 OSHA inspections and 5 violations, translating to 0.63 violations per inspection. Of those violations, 4 (80.0%) were classified as serious, 0 (0.0%) as willful, and 1 (20.0%) as repeat. Serious violations denote hazards likely to cause death or serious physical harm; willful and repeat categories indicate intentional disregard or recurrence of previously cited hazards.

OSHA assessed $42,743 in initial penalties against this employer, later adjusted to a current total of $31,683 - a 25.9% reduction. Average penalty per inspection works out to $3,960. Against the Construction industry average of $6,751 per employer, this record runs well above peers (4.7x the sector average).

Inspection activity spans from 2011-07-12 to 2024-12-03, a window of roughly 13 years.

Enforcement detail

OSHA Inspection History

Total Inspections

8

First Inspection

2011-07-12

Last Inspection

2024-12-03

Inspection Span

13 yrs

Violations / Inspection

0.6

Avg Penalty / Inspection

$3,960

Industry Avg / Inspection

$3,361

What this shows 8 inspections over 13 years, averaging 0.6 violations per visit. That's $3,960 per inspection vs. the Construction average of $3,361.

Enforcement detail

Violation Breakdown

4

Serious

80.0% of total

0

Willful

0.0% of total

1

Repeat

20.0% of total

0

Other-Than-Serious

0.0% 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

$42,743

Current Penalty Amount

$31,683

Penalty Reduction

25.9%

What this shows Penalties were reduced by $11,060 from the initial assessment of $42,743. Reductions may result from informal settlements, formal contests, or negotiated agreements with OSHA.

Industry Safety Context: Construction

How Mammoth Underground, LLC compares to the Construction sector, which has 61,413 employers tracked by PlainWorker.

Metric Mammoth Underground, LLC Industry Avg
Inspections 8 2.0
Violations 5 3.3
Total Penalty $31,683 $6,751
Avg Penalty per Inspection $3,960 $3,361
View all 61,413 employers in Construction →

Nearby & Similar Employers in Construction

Perry Roofing Contractors
Gainesville, FL
0 inspections $0
Boer Brothers Heating and Air, LLC
Carrboro, NC
0 inspections $0
Enz Masonry, INC.
Chicago, IL
5 inspections $31,696
Nan INC
Ewa Beach, HI
2 inspections $31,696
Ranch Masonry, INC.
Houston, TX
4 inspections $31,697

Compare Mammoth Underground, LLC vs Perry Roofing Contractors side-by-side →

Frequently Asked Questions

Is Mammoth Underground, LLC safe to work at? ▼
Based on OSHA records, Mammoth Underground, LLC's workplace safety record is concerning, with multiple serious compliance issues. The employer has 5 violations across 8 inspections, including 4 serious violations. Compared to Construction industry peers, this is above average for penalties. Review the full inspection history below for details.
How many OSHA violations does Mammoth Underground, LLC have? ▼
Mammoth Underground, LLC has 5 OSHA violations on record, including 4 serious, 0 willful, and 1 repeat violations. The total current penalty amount is $31,683.
How many OSHA inspections has Mammoth Underground, LLC had? ▼
Mammoth Underground, LLC has had 8 OSHA inspections, with the first recorded on 2011-07-12 and the most recent on 2024-12-03. This averages 0.6 violations per inspection.
What is the total penalty amount for Mammoth Underground, LLC? ▼
Mammoth Underground, LLC has been assessed $31,683 in current OSHA penalties, reduced from an initial assessment of $42,743 (a 25.9% reduction).
Does Mammoth Underground, LLC have any serious or willful violations? ▼
Yes. Mammoth Underground, LLC has 4 serious violations, and 1 repeat violations. Serious violations involve hazards likely to cause death or serious physical harm. Willful violations indicate the employer intentionally or knowingly disregarded the law.
What industry does Mammoth Underground, LLC operate in? ▼
Mammoth Underground, LLC operates in the Construction sector (NAICS code 237110). This industry has 61,413 employers tracked by PlainWorker, with 123,350 total OSHA inspections and $414.57M in cumulative penalties.
How does Mammoth Underground, LLC's safety record compare to industry average? ▼
Mammoth Underground, LLC's total OSHA penalty of $31,683 is above the Construction industry average of $6,751 per employer (4.7x the average). The employer has 8 inspections compared to the industry average of 2.0 per employer. For a direct comparison, Nan INC in Ewa Beach, HI is a similar construction employer with $31,696 in current penalties.

Explore PlainWorker

Construction Industry

All 61,413 employers in this sector
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What to check next

Mammoth Underground, LLC'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 8 inspections on record. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2026.