The pipes in your home are private property. You will need to contact a plumber to conduct repairs.
How to turn off water until plumber or contractor arrives:
You can turn off the water supply by closing the main water supply valve (also called the stop and waste valve). The valve, which is part of your private plumbing system, is typically located on the foundation wall where the drinking water pipe enters the home, just before the water meter.

If the shut off valve is not working, you can contact the water department to turn off the water supply at the property line. There is a fee for this service.
During Office Hours (Monday - Friday 8:30am - 4pm)
If this is required during office hours please call the main office at 519-631-4860 and press '3'. Please note the water department receives a high volume of calls and so you may need to leave a message. You may prefer to email the water department and leave a detailed message.
After Office Hours/Holidays/Weekends
If this is required after office hours, please call the main office at 519-631-4860 and press '1'. You will then be put through to a person (unless they are on the phone) who will dispatch you to the after hours water operator for assistance.