DIAMOND PLUMBING & HEATING, LLC is a plumbing, heating, and air-conditioning contractors employer in NORWICH, CT. Federal records show 1 OSHA inspection with 5 violations and $60,000 in penalties. All data sourced from public federal enforcement records.
Data sourced from OSHA, DOL WHD, MSHA, EPA ECHO, NLRB, FMCSA, OFLC, BLS, SAM.gov, CMS, USAspending, CPSC, NHTSA, and the UVA Corporate Prosecution Registry. Last updated: May 3, 2026.
DIAMOND PLUMBING & HEATING, LLC
7 HAMILTON COURT, NORWICH, CT, 06360
Parent: QUANTUM CORP /DE/ (1,580 locations)
238220 — Top companies in Plumbing, Heating, and Air-Conditioning Contractors
Industry Benchmark
Data Insights
Inspection Breakdown
Peer Comparison
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▶SEC Enforcement(1)
$5,000,000 totallast: 2014-01-09
SEC Enforcement(1)
SEC Litigation Releases filed against QUANTUM CORP /DE/— every public-company employer profile shows the parent's SEC enforcement history. Source: sec.gov/litigation/litreleases.
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Inspection History
No inspection records found.
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Data aggregated from public federal enforcement and program records (OSHA, WHD, MSHA, EPA, NLRB, FMCSA, OFLC, BLS, SAM.gov, CMS, USAspending, CPSC, NHTSA) plus the UVA Corporate Prosecution Registry. Employer profiles matched by name and location — matching errors may occur. Risk scores computed by FastDOL, not official government assessments. OSHA citations typically appear 3-8 months after the inspection, so very recent enforcement actions may not yet be reflected. Data provided as-is. Report a data error.
Part of a larger organization
DIAMOND PLUMBING & HEATING, LLC is one of 1,580 establishments in our dataset that roll up under the parent organization QUANTUM CORP /DE/. QUANTUM CORP /DE/ is a SEC public reporter (QMCO), with most recent reported revenue of $274M.
Federal enforcement records on DIAMOND PLUMBING & HEATING, LLC represent activity at this specific establishment. The full enforcement footprint of QUANTUM CORP /DE/ across all 1,580 of its tracked locations is viewable on the parent profile.
Other establishments operated by QUANTUM CORP /DE/
- DIAMOND CHEMICAL COMPANY, INC. — EAST RUTHERFORD, NJ — 3 federal records
- DIAMOND WIRE SPRING COMPANY — PITTSBURGH, PA — 3 federal records
- DIAMOND SAND AND GRAVEL INC — SPARTA, NJ — 3 federal records
- Diamond Equipment Contracting Corporation — VIRGINIA BEACH, VA — 2 federal records
- Diamond D General Engineering — Woodland, CA — 2 federal records
- DIAMOND CRYSTAL BRANDS, INC — PERRYSBURG, OH — 2 federal records
- Diamond Trucking — Peru, IN — 2 federal records
- Diamond Transportation — Springfield, VA — 2 federal records
- DIAMOND PALACE HOTEL AND CASINO CORP — SAN JUAN, PR — 2 federal records
- DIAMOND CORING COMPANY, INC. — PALATINE, IL — 2 federal records
Other employers in Plumbing, Heating, and Air-Conditioning Contractors within CT
- MODERN MECHANICAL SYSTEMS, INC. — AVON — 2 federal records
- DUCTCO, LLC — HAMDEN — 2 federal records
- HARRY GRODSKY AND COMPANY, INC. — WINDSOR — 2 federal records
- MODERN MECHANICAL SYSTEMS, INC. — STAMFORD — 2 federal records
- ADJ OF STAMFORD, INC. — NORWALK — 2 federal records
- MULVANEY MECHANICAL INCORPORATED — WEST HAVEN — 2 federal records
- MACK FIRE PROTECTION, LLC — SANDY HOOK — 2 federal records
- HARRINGTON ENGINEERING, INC. — MERIDEN — 2 federal records
- MULVANEY MECHANICAL, INC — WALLINGFORD — 2 federal records
- JM SHEETMETAL, LLC — SOUTHINGTON — 1 federal record
Industry context
Within the plumbing, heating, and air-conditioning contractors industry in CT, DIAMOND PLUMBING & HEATING, LLC ranks in the 95th percentile of OSHA violation frequency across 803 comparable establishments. That places this employer among the highest-violation establishments in its peer set.
OSHA penalty totals rank in the 99th percentile of the same peer group.
The Bureau of Labor Statistics reports an industry-average Total Recordable Incident Rate (TRIR) of 3 for the plumbing, heating, and air-conditioning contractors sector, with a Days Away, Restricted, or Transferred (DART) rate of 1.7.
Activity timeline
Frequently Asked Questions
- What is DIAMOND PLUMBING & HEATING, LLC's OSHA violation history?
- DIAMOND PLUMBING & HEATING, LLC has 1 OSHA inspection on record with 5 violations and $60,000 in total penalties.
- How does DIAMOND PLUMBING & HEATING, LLC's safety record compare to its industry?
- DIAMOND PLUMBING & HEATING, LLC operates in the plumbing, heating, and air-conditioning contractors industry. The industry average Total Recordable Incident Rate (TRIR) is 3.
About this data
This profile aggregates federal enforcement records on DIAMOND PLUMBING & HEATING, LLC of NORWICH, CT from 17 federal data sources. Records were found in 4 sources: OSHA workplace safety inspections, SEC Litigation Releases, SEC XBRL companyfacts (parent financials), and BLS industry safety benchmarks. The remaining 13 sources were checked and found no matching records: WHD, MSHA, EPA, NLRB, OFLC, OFCCP, FMCSA, USAspending, SAM.gov, CMS, CPSC, NHTSA, UVA.
Establishments are matched across agencies using normalized employer name, state, and ZIP code. The dataset was last refreshed on May 3, 2026. DIAMOND PLUMBING & HEATING, LLC resolves to the parent rollup QUANTUM CORP /DE/, which operates 1,580 establishments in our dataset.
This profile may be incomplete if DIAMOND PLUMBING & HEATING, LLCoperates under multiple legal names, files under variations our entity-matching rules don't yet cover, or maintains records below current matching thresholds. To report a missing record or correction, email corrections@fastdol.com.