Nicholson Plumbing, Electrical, HVAC

Horizon Group Holdings LLC

71 Whitney Dr., Holliston, MA 1746
Heating, ventilation and air-conditioning (HVAC) contractors (NAICS 238220)

DART 11.75 9 recordable cases · 60 avg employees · 119,113 hours worked

This establishment vs. the industry

The DART rate at this establishment is about 3.7× the industry median.

This establishment: 11.75
Industry median (Heating contractors, n=2531): 3.17

Reported injury and illness, 2024

Fatalities0 Days-away-from-work cases5 Restricted-duty / transferred cases2 Other recordable cases2 Total recordable cases9 Days lost to injury193

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

DART rate11.75 (days away + restricted/transferred) DAFW rate8.40 (days away from work only) Total recordable rate (TRIR)15.11 (all OSHA-recordable cases) Annual average employees60 Total hours worked119,113
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