The number of confirmed COVID-19 cases in Ontario continues to climb.
She says 63 per cent of the day's new cases are among people under the age of 40.
A fourth establishment is still in the process of being served.
King Taps is now conducting a deep cleaning of its premises and a "review of on-site practises and protocols".
In July, the popular Toronto restaurant was placed under investigation after a video released on social media appeared to show patrons and staff failing to follow COVID-19 public health rules.
In a post of its own on Saturday, King Taps said it was "co-operating fully with Toronto Public Health". Its statement said guests who visited the venue on September 6, 9,10 and 11 "may wish to contact Toronto Public Health".
The video, which also showed staff failing to wear masks, prompted outrage online.
"To all of those who made reservations for this weekend, please rest assured, we will be offering refunds".
The province processed more than 42,500 tests on Saturday. "That's why our Medical Officer of Health is taking swift action to shut down four high-risk establishments until further notice", said Joe Cressy, councillor for Ward 10 Spadina-Fort York and Toronto Board of Health chair.
This all comes on the heals of the Ford government ordering all bars, clubs and restaurants to stop selling alcohol at 11 p.m. each night, and closing shop at midnight.
Ontario is reporting 491 new cases of COVID-19, the highest amount of new cases recorded since early May.
The new cases reported in Ottawa on Sunday are among 491 new cases reported across Ontario, the highest figure in almost five months.