Calgary’s water supply depends on the Bow and Elbow Rivers — both of which experience significant seasonal variation. During drought years or high-demand summer periods, the City of Calgary activates outdoor watering restrictions that directly affect how and when you can run your irrigation system. This guide explains Calgary’s watering restriction system, what each stage means for your irrigation schedule, and how to program your controller to stay compliant while keeping your lawn and garden healthy.
Calgary’s Outdoor Watering Restriction System
The City of Calgary uses a 4-stage Outdoor Water Use Advisory system to manage demand during periods of high supply stress. Each stage progressively restricts outdoor water use, with Stage 4 being a near-total ban. Stages are activated and lifted by the City based on reservoir levels, river flow rates, and forecast demand.
Odd/Even Watering Days (Year-Round Baseline Rule)
Even before any Water Use Advisory is triggered, the City of Calgary has a voluntary odd/even watering schedule that applies as the baseline practice for all outdoor irrigation:
- Odd-numbered addresses (1, 3, 5, 7…) water on odd-numbered calendar days (e.g., June 1, June 3, June 5)
- Even-numbered addresses (0, 2, 4, 6…) water on even-numbered calendar days (e.g., June 2, June 4, June 6)
- This schedule applies to lawn sprinklers and irrigation systems, not hand-held watering
Following the odd/even schedule is the baseline expectation for all Calgary households with irrigation systems, even in normal (non-advisory) conditions. J.G. Irrigation programs all new irrigation controller installations to respect the odd/even schedule as the default setting.
The 4-Stage Water Use Advisory System
Stage 1 Advisory: Heightened Awareness
What triggers it: Slightly elevated demand or early signs of supply stress. Typically voluntary. No mandatory restrictions yet.
What it means for irrigation:
- Continue following the odd/even voluntary schedule
- Avoid watering between 10 AM and 6 PM (peak evaporation window)
- Early morning (4–7 AM) or evening (7–10 PM) watering is recommended
- Repair any known leaks or broken heads promptly
Smart controller action: Confirm your Rachio or Hydrawise controller is set to water only in the early AM window. Most smart controllers default to this anyway. Check that seasonal adjustment / weather intelligence is active.
Stage 2 Advisory: Mandatory Watering Schedule
What triggers it: Elevated demand combined with declining reservoir levels or reduced river flow. Stage 2 is the most common activated stage during a typical Calgary summer drought period.
What it means for irrigation:
- Mandatory odd/even watering day schedule (previously voluntary, now enforceable)
- Outdoor watering is prohibited between 10 AM and 8 PM — all zones must run before 10 AM or after 8 PM
- Maximum watering frequency: once per day, on your assigned day only
- Exceptions: newly seeded lawns within 30 days of seeding may water daily
Controller programming for Stage 2:
Set a single start time in the early AM window (recommend 5:00 AM). Ensure all zones complete by 9:00 AM. For most Calgary residential systems with 6–8 zones at 8–12 minutes each, total run time is 48–96 minutes — well within the pre-10 AM window. Set watering to every other day matching your odd/even assignment.
Stage 3 Advisory: Significantly Reduced Watering
What triggers it: Serious supply stress, sustained high demand. Rare but occurs in severe drought years.
What it means for irrigation:
- Watering permitted once every THREE days (not just odd/even — less frequent)
- Still prohibited between 10 AM and 8 PM
- Hand-held watering with a hose is permitted daily but must stop between 10 AM and 8 PM
- Vehicle washing, pool filling, and other decorative water use are prohibited
Turf stress note: At Stage 3, most Calgary lawns will begin to show drought stress (yellowing, wilting). This is expected and acceptable — established Kentucky bluegrass and fescue lawns will recover once restrictions lift. Do not panic. Avoid applying fertilizer under Stage 3 restrictions as it increases water demand.
Stage 4 Advisory: Extreme Conservation
What triggers it: Critical supply emergency. Extremely rare; has been activated in Calgary only once in recent history (related to the 2013 flood, for different infrastructure reasons).
What it means for irrigation:
- All outdoor watering is prohibited except for hand-held watering of food gardens and new plantings essential to survival
- Lawn irrigation systems must be turned off completely
- Violation fines apply
Action: Turn off your irrigation system controller completely. Do not leave the system on a rain delay — disable it entirely to ensure no accidental zone activations.
How to Program Your Irrigation Controller for Calgary Restrictions
Rachio 3 (Smart Controller)
The Rachio 3 has built-in watering restrictions functionality in the app:
- Open the Rachio app → tap your controller → tap the gear (settings) icon
- Tap Watering Restrictions
- Enable Day Restrictions → select Odd or Even depending on your address
- Enable Time Restrictions → set Allowed Window to 12:00 AM – 10:00 AM (or 8:00 PM – 11:59 PM for evening watering)
- Tap Save
The Rachio will now only schedule watering within your permitted window and days, even when Weather Intelligence suggests extra watering is needed. This is the correct Stage 2 compliance setup.
Hunter Hydrawise
In the Hydrawise app:
- Open the app → tap your controller → tap Programs
- Select each program → tap Watering Days → select Odd or Even
- Tap Start Times → set the start time to 5:00 AM (ensuring all zones complete before 10 AM)
- Tap Save for each program
Standard Timer Controllers
For standard (non-smart) controllers like Hunter X-Core, Rain Bird ST8, or similar:
- Set Program A start time to 5:00 AM (or your preferred AM window)
- For Odd days: check your controller’s manual for Odd Day watering mode (most modern timers have this)
- For controllers without odd/even capability: manually set specific watering days (e.g., Mon/Wed/Fri as an approximation — though this doesn’t perfectly replicate odd/even, it achieves the every-other-day frequency)
J.G. Irrigation recommendation: Upgrading to a smart controller (Rachio or Hydrawise) at the same time as any service visit is the easiest way to ensure permanent compliance with Calgary’s watering restrictions without manual reprogramming every time an advisory changes. Read our full smart controller comparison guide.
Calgary Watering Restrictions and Your Lawn: What to Expect
Stage 1–2: Lawn Stays Green
Most established Calgary lawns can maintain acceptable colour and density with twice-weekly watering (every-other-day odd/even). The key is watering deeply each time (to 6-inch soil depth) rather than shallowly and frequently. A properly calibrated system running 8–12 minutes per spray zone or 15–20 minutes per rotor zone typically achieves this.
Stage 3: Expect Yellowing
Once-every-3-days watering is insufficient to maintain green colour in most Calgary lawn grasses during peak summer heat. Lawns will yellow and may go partially dormant. This is normal and expected — established bluegrass and fescue will recover within 2–4 weeks of normal watering resuming after restrictions lift.
New Sod and Seeded Lawns
Newly installed sod or seeded lawns require daily watering for the first 2–4 weeks regardless of restrictions. The City of Calgary typically includes an exemption for newly established turf in Stage 2 conditions — contact Calgary Water Services to confirm the current exemption policy if you have newly seeded or sodded areas under a Stage 2 advisory.
How to Know When Calgary Issues a Watering Advisory
- City of Calgary website: calgary.ca/water — advisories are posted prominently on the water services homepage
- Calgary Water on social media: @CityofCalgary on X (formerly Twitter) and Facebook posts advisories promptly
- Local news: Stage 2+ advisories receive local news coverage in Calgary
- Rachio / Hydrawise apps: Some smart controller platforms integrate local utility restriction data — check your app settings for Water Authority Restrictions
Frequently Asked Questions — Calgary Watering Restrictions
Is it illegal to water my lawn during a Stage 2 advisory at noon?
Yes. Stage 2 advisories prohibit outdoor watering between 10 AM and 8 PM. Running your irrigation system during this window is a violation of the City of Calgary’s outdoor water use bylaw. Fines apply for repeat violations. Program your controller to water before 10 AM (recommend 5:00 AM start) to stay compliant.
Does my drip irrigation count under Calgary watering restrictions?
Yes — drip irrigation zones connected to your home’s municipal water supply are subject to Calgary watering restrictions. However, drip irrigation’s low precipitation rate means it can often deliver adequate root-zone moisture to garden beds within a shorter run time and on restricted days. A smart controller will automatically adjust drip zones to fit your restriction window.
Can J.G. Irrigation reprogram my controller for restriction compliance?
Yes. J.G. Irrigation can reprogram your controller for Stage 2 compliance (odd/even schedule, AM watering window, adjusted run times) as part of any service visit. Call 587-433-4795 to arrange.
Book Irrigation Service in Calgary
J.G. Irrigation programs all new installations for Calgary odd/even compliance as standard. If you need an existing controller reprogrammed for current restriction compliance, or if you want to upgrade to a smart controller that manages restrictions automatically, call 587-433-4795 or contact us online. We serve Calgary, Airdrie, Cochrane, Okotoks, Chestermere, Langdon, and surrounding communities.
