Denron Plumbing & HVAC, LLC

605 Front Street, Manchester, NH 3102
Plumbing and heating contractors (NAICS 238220)

DART 9.72 26 recordable cases · 240 avg employees · 452,826 hours worked

This establishment vs. the industry

The DART rate at this establishment is about 3.1× the industry median.

This establishment: 9.72
Industry median (Heating contractors, n=2531): 3.17

Reported injury and illness, 2024

Fatalities0 Days-away-from-work cases3 Restricted-duty / transferred cases19 Other recordable cases4 Total recordable cases26 Days lost to injury30

Injury rates (per 100 FTE-year, OSHA standard)

DART rate9.72 (days away + restricted/transferred) DAFW rate1.33 (days away from work only) Total recordable rate (TRIR)11.48 (all OSHA-recordable cases) Annual average employees240 Total hours worked452,826
What these numbers mean. An OSHA-recordable case is a work-related injury or illness that resulted in death, days away from work, restricted work, transfer to another job, medical treatment beyond first aid, loss of consciousness, or significant injury diagnosed by a physician. DART rate is the OSHA-standard incidence measure — calculate it as (cases with days away + restricted/transferred) × 200,000 / hours worked. The 200,000 hours normalizes to 100 full-time-equivalent workers over a year. National average DART across all industries is around 1.7; high-risk industries (skilled nursing, warehousing, courier) routinely exceed 5.

Source: OSHA ITA 300A Summary Data, calendar year 2024 filings (downloaded 2026-05-22).

OSHA Lookup · workplace-injury data from OSHA ITA 300A 2024 · About / methodology