In our municipality, our water meters are read every May, and we receive our water tax bill in September. I was quite pleased to see our consumption drop from 463 cubic metres to 303. This saving converts to 160,000 litres or 43,000 U.S. gallons of water.
Virtually all of this water savings was due to our higher efficiency Samsung washer and dishwasher that we put in July 2008, so this is only 10 months of actual reduction in consumption.
This year in August we replaced 2 of our original 16-20 litre per flush toilets with American Standard Flo-wise dual-flush (3/6 litre), which should result in another significant drop in water consumption.
What does this work out to in $ terms? We saw an immediate reduction of $52 on our bill, but since rates have risen significantly, we actually saved $125 over what we would have paid had we consumed as much water as the previous period.
Having done all this, there will be now a declining return on our investment, as our water consumption is charged on a progressive basis (the more you use, the more you pay). We will likely drop consumption to below 200 cubic metres next year, which is charged the lowest rate.
At this point, the swimming pool and our reverse osmosis water system add significantly to water consumption, but we are not about to give up either.