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We are currently using the Outdoor Water Use Restrictions outlined in Schedule E of the Water Utility Bylaw which is our only tool to enforce water use reductions.
All citizens and businesses, including car washes have been asked to reduce their indoor water use but these actions are voluntary.
As you have referenced "Watering plants, shrubs and trees for commercial sale" is an activity that is allowed during Stage 4 restrictions. However, the adjacent column indicates that this applies to "Nurseries, garden centers, turf tree farms and market gardens and community gardens". Therefore, this is to be interpreted as trees/plants which are not yet planted in their final location can be watered with potable water provided by Calgary Water Services. If a tree/plants have been installed in its new home, it is considered sold. A financial transaction need not have taken place.
Further, Schedule E indicates that "Watering of New Grass Plantings (sod or seed) with reasonable evidence of recent installation: sod within 21 days seed within 45 days" is allowed in Stages 1-3, but NOT during Stage 4. This is due to the severity of any situation leading to Stage 4 restrictions.
All contractors requiring water to continue doing their jobs (eg. watering newly installed plants/trees) have been asked to source water outside of Calgary's water service area. Bulk stations in Calgary, Airdrie, Chestermere and Strathmore receive Calgary's potable supply and SHOULD NOT be used. All other bulk stations in the region can be used to fill trucks.