When your community saves so much water/electricity, that your water/electricity company has to raise its prices for usage, so then going back to using water/electricity more laid back will become a bad idea.
"Why is water becoming more expensive for the city now?"
"Oh, cause last year I tried really hard to encourage everyone to save water in several different ways. I guess more people acted than expected."
"Well thanks to you, the WHOLE city is preservation-fucked!"