The official website of the City of London300 Dufferin Avenue519-661-CITY (2489)
irrigation system

Irrigation System

Looking for an Irrigation Professional?

When looking to install or maintain your irrigation system, look for a certified Water Smart Irrigation Professional. These professionals are certified by Landscape Ontario using in-class and field components to be able to optimize irrigation systems for performance while minimizing water usage. For more details on how to find a Water Smart Irrigation Professional or how to become certified as one please visit

Spruce Up Your Sprinkler System!

Follow the tips below to help you maintain an efficient irrigation system.

Irrigation System

*This graphic is available in other formats upon request

Selecting an Irrigation System

  • Select a "Water Smart" labelled irrigation system controller which will automatically adjust watering for weather changes.
  • Consider using a Water Smart Irrigation Professional to install a system that will work for you and your property.
  • Consider using pop-up spray heads with efficient multi-stream rotary nozzles for lawns and gardens and a drip irrigation system for trees, garden beds, and shrubs.

Connecting your Irrigation System

  • When connecting a new irrigation system to municipal water be sure to use a backflow preventer to protect the municipal water system and your home from contamination.
  • Backflow preventers require a building permit from plumbing for the installation, or the replacement of any existing backflow preventer.

Direct your System

  • Direct your irrigation system spray heads on porous landscapes and away from sidewalks.
  • Also ensure your irrigation system is directed to water your lawn and gardens in the early morning. Watering before 10 a.m. is better for plant health as watering at night can increase the plants chances of developing fungus, bacteria, and even attract bugs and pests which may affect your plants health.

Inspecting your System

  • Every irrigation system should be inspected each year something's to consider when inspecting your system are to:
    • Adjust and clean spray heads each season in order to ensure you are not overwatering certain parts of your lawn. Signs of overwatering include leaves turning yellow or a build up of algae and fungi. Ensure the pressure for your system is set for 30 psi, to maintain efficiency.
    • Check your system frequently for broken spray heads. Broken spray heads often have water spraying out or will be leaking from the top or bottom of the head.
    • Check the controller box for water, if there is water inside it may indicate a leaky valve in need of repair.
    • Look out for wet spots, depressions or small holes in the ground as this could indicate a leak from an irrigation line.
    • Know the location of the shut off valve so you can shut of your irrigation system for maintenance, leaks, and emergencies.

Know When to Water

Use of Water Externally, for outdoor watering is regulated by the City of London's By Law W8-16005- Part 9, for the purpose of limiting the consumption of water as necessary during June, July, and August. Remember to set your irrigation system to water on your assigned day. Even municipal addresses such as those ending in 0, 2, 4, 6, 8 can water on even numbered calendar days, whereas odd municipal addresses such as those ending in 1, 3, 5, 7, 9 can water on odd calendar days. Please note there is no external water use restrictions on weekends or statutory holidays.

Last modified: