Good question. I'm not so certain there are officials who monitor quarantines.
While you are looking that up, I'll bore everyone by telling them how the Public Health systems works here (Ontario/Canada) and similarly throughout the other provinces.
The province is divided into regions, each with an office of the Public Health Unit. This organisation is at arms length from your doctor, or the hospitals, and works only with Public Health issues. They manage contagious disease, vaccination programs, restaurant inspections, well baby checkups, drug addition, research, health education, injury prevention, lab services, etc. It is publicly funded, although it offers some services for a fee.
If I were to have a positive Covid test, this information, being a reportable disease, would be given to the Public Health Unit. Within one day, they would follow up by providing instructions for self care, isolation, and support. An officer will also immediately begin contact tracing and testing. The unit will also supervise the quarantine period by calling/checking several times a day to make sure you are at home and that your symptoms haven't worsened.
At the end of the quarantine period, they would require another Covid test. Early in the pandemic, two negative tests were required before you were considered recovered, but now it might be only one.
The case data which they collect about you, (test results, age, sex, how you contacted Covid ) is reported to Health Canada, the federal arm of the Public Health system.
The Public Health Office is a Crown agency, an arms length agency of the federal government. It was established following the Influenza epidemic of 1918.
Vision, Mission, Mandate and Values | Public Health Ontario
https://www.publichealthontario.ca/...ovid-19-regional-epi-summary-report.pdf?la=en