Emergency Medical / Security: On McMaster University campus, call Security at extension 88 or 905-522-4135 from a cell phone.
Hospital Emergency Medical / Security: For McMaster HSC, call Security at extension 5555 or 905-521-2100 from a cell phone.
University Security (Enquiries / Non-Emergency): Dial 24281 on a McMaster phone or dial 905-525-9140 ext. 24281 from a cell phone.
Environmental & Occupational Health Support Services (EOHSS): For health and safety questions dial 24352 on a McMaster phone or dial 905-525-9140 ext. 24352 from a cell phone.
