Geelong Hospital also failed to meet the 100 per cent benchmark for patients requiring urgent elective operations, such as those requiring surgery for cancer.
The figures were contained in the Your Hospitals report card for the year to June 2010.
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Geelong Hospital admitted almost 67,000 patients in 2009-10.
It failed every emergency department benchmark apart from the one requiring every patient with a life-threatening illness to be treated immediately.
Almost one third of category two emergency patients, who may be in severe pain, have serious breathing difficulties or major fractures, were not seen within the 10-minute target.
More than one quarter of emergency department patients still had not been admitted to a bed after eight hours, and three in 10 non-admitted patients stayed in the emergency department for more than four hours.
The hospital performed better in elective surgery categories, however it failed to treat all of the most urgent elective surgery cases within one month.
By contrast, Ballarat Base Hospital, which admitted more than 33,500 patients, exceeded all government benchmarks for emergency department patients.
But it was unimpressive in its elective surgery waiting times, failing every category and not treating 100 per cent of the most urgent cases within 30 days.
Further north, Bendigo Hospital admitted more than 35,000 patients.
Almost one quarter of category two emergency patients were not treated within 10 minutes, while four in 10 category three patients, who may be suffering moderately severe blood loss, persistent vomiting or dehydration, were not treated within 30 minutes.
The hospital also failed to treat around 30 per cent of semi-urgent elective surgery patients within the required 90 days.
