Obtain a water audit
Sometimes you need to take a systematic look at your building, or have someone else look at it to find the opportunities. Normally, an energy audit can identify savings of 20-30%.
Saskatchewan Environmental Society can provide audits for small buildings. Check out this page if you are a non-profit organization, or contact the SES Energy Conservation Coordinator at email@example.com.
Contact engineering consultants for large buildings.
If you want to do it yourself, check out this document from the City of Victoria.