Ontario Dig Authority

Service Interruption Notice

Some systems will be temporarily unavailable during the off-peak hours of September 30, 2026, as we complete system updates to support the transition from Ontario One Call to Ontario Dig Authority.

Beginning at 7:00 p.m., our phone system will be transitioned. During this time, there may be a brief interruption to phone services.

Beginning at 9:00 p.m., the web portal will be unavailable for approximately four hours while updates are completed.

We are working to restore all services as quickly as possible and appreciate your patience. We ask that non-urgent locate requests be submitted once service has been restored.

Emergency, Priority 0, and Sewer Lateral requests will continue to be available through our phone service.

Thank you for your understanding during this transition.

Safe excavation starts with us.

Ontario One Call is now operating as Ontario Dig Authority.

Request a Locate

Click Before
You Dig

It’s Free. It’s Easy. It’s the Law.

Request a Locate

Big projects move fast.

Your locates should too.

A streamlined locate process built for complex, multi-phase, and long-term work.

Learn More About Dedicated Locator

Public Utility Locate Service

There is buried infrastructure all over Ontario. You must contact Ontario Dig Authority to get buried cables, pipes, and wires located so you can dig safely.

Ontario Dig Authority, formerly known as Ontario One Call, is a public safety administrative authority and the communication link between those wanting to dig and buried infrastructure owners who are required to provide locates.

Ontario Dig Authority does not physically mark the lines, pipes, or cables. We relay the dig information to the buried infrastructure owners so they can mark (locate) based on the request submitted.

Click Before You Dig

Damaging underground infrastructure is dangerous. Hitting wires, pipes, or cables can cause serious injuries and carry hefty financial consequences.

Before you break ground, request utility locates through Ontario Dig Authority.

It’s free, required by law, and helps protect you, your project, your community, and the underground infrastructure we all rely on.

Request a Locate

Prepare for your Project

Locates are required for any project that breaks ground, no matter the size or depth of the excavation.

What To Do Next?

Learn About Locates

Management & Education

Infrastructure Owner Area

Get Ready To Dig

Resources for Contractors

What to do Before you Dig

Step 1:

Contact Ontario
Dig Authority

At least 5 business days before you dig, submit a locate request. We will notify buried infrastructure owners that you plan to dig.

Step 2:

Get Locates

Each utility company will send a utility locator to mark the location of buried lines and cables at your dig site for free.

Step 3:

Dig Safely

Dig safely. Respect the marks and follow the instructions that are provided by the locator.

Has your project changed?

You MUST request a new locate if your project changes.

Locate Colour Codes

What do the markings mean?

When someone is planning to dig, infrastructure owners provide locate responses for the underground infrastructure they own.

Unless an infrastructure owner provides a clearance, locate responses may include field markings such as flags, paint, or stakes. These markings use different colours to identify the type of buried infrastructure in the area.