Small Drinking Water Systems

If your water doesn’t come from a municipal system, you might have a Small Drinking Water System (SDWS). These systems need to follow Ontario Regulation 319/08 to keep your water safe for everyone to drink.

Is your system an SDWS?

Your system might be a small drinking water system (SDWS) if you provide water at places like:

• Restaurants, cafes, or coffee shops

• Campgrounds, motels, or B&Bs

• Sports fields, community centres, or marinas

• Churches, mosques, temples, or other places of worship

• Any public space with drinking fountains, showers, or washrooms

Not sure if this applies to you? No problem—give us a call at 1-800-922-0096, and we’ll help you figure it out.

What are your responsibilities when you have a SDWS?

Your job is to keep your water safe. Here’s how you can do that:

• Learn the rules: The Small Drinking Water System Operator’s Guide explains everything you need to know to meet Ontario’s safety standards.

• Test your water regularly: Regular testing is required to ensure your water is safe. Use a licensed lab—find one on the Ontario Ministry’s lab list.

• Keep good records: Tracking your water tests and maintenance helps you stay organized. These tools can make it easier:

• View Monthly Signage Sheet for Operators

• View Operational Checks Documentation Log

Start testing your water regularly and use the tools above to keep everything in order.

What to do if something goes wrong

Sometimes, water tests show a problem. Don’t panic—here’s what to do:

• Take a deep breath. These issues can usually be fixed.

• Call us right away at 1-800-922-0096. Our Public Health Inspectors are here to guide you and help get your water back to safe standards.

What to do next: Save our number so you can call us as soon as an issue comes up.

How to reopen after a shutdown

If your system hasn’t been used for 60 days or more, you’ll need to follow these steps before turning the water back on:

• Let us know: Fill out the Notification of Intent to Supply Water Form or use the online form.

• Follow our guidance: A Public Health Inspector will let you know what needs to be done to safely reopen your system.

What to do next: Complete the form and wait for approval before starting your system again.

How to stay on track

Keeping your system safe and running smoothly is easier when you stay on top of things:

• Know the rules. Use the Operator’s Guide to understand what’s expected.

• Test your water on time. Set reminders so you never miss a test.

• Ask for help if needed. Call us anytime—we’re here to support you.

Need more information?

Check out these helpful resources:

• Ontario Regulation 319/08

• Small Drinking Water Systems Information – Ministry of Health

• Lab Services Notification Form