Small Drinking Water Systems

If you make drinking water available to the public and you do not get your drinking water from a municipal drinking water system, you may be an owner or operator of a "small drinking water system."

Examples of small drinking water systems include but are not limited to motels, bed & breakfasts, restaurants, gas stations, trailer parks/campgrounds, and churches.

Small Drinking Water Regulations

Small Drinking Water regulation 319/08 and 318/08 outline the legal responsibilities of the owners and operators of these small systems.

See these frequently asked questions to help you determine if you are the owner of a small drinking water system and to become familiar with the province's regulatory requirements.

Contact Public Health, 519-575-4400 ext 5147 for more information.


Owners and operators of small drinking water systems regulated under image of faucetOntario Regulations 318/319 are required to report incidents of adverse water quality to Public Health.

To report an adverse drinking water quality incident, call Public Health at 519-575-4400, ext 5147 immediately. You will be directed to an after-hours on-call Public Health Inspector even if calling outside of regular office hours (8:30 am to 4:30 pm).


Regulations from the Ministry of Health and Long-Term Care

Reg. 318/08 (Transitional - Small Drinking Water Systems)
Reg. 319/08 (Small Drinking Water Systems)

Procedures for keeping your drinking water safe from the Ministry of Health and Long-Term Care

Forms from the Ministry of Health and Long-Term Care

4578-64E: Laboratory Services Notification (LSN) form
4579-64E: SDWS Identification form
4580-64E: Notice of Adverse Test Results and Issue Resolution form

Useful links

Drinking Water Ontario - provides resources and information on our province's drinking water

Health Canada - provides resources and information on requirements for keeping drinking water safe

List of Licensed Laboratories - provides a list of laboratories that are licensed to test drinking water in Ontario