That could be quite messy. Why don't you change the plumbing to collect grey water? I plan on moving to Colorado and I am bookmarketing sellers of plastic cistern type tanks on Craigslist, so when I move I will have the resources to contact and plan on changing the plumbing, then you'll always have it in place because in Charlotte the water bill is included in the sewer bill and why pay discharge fees when you aren't discharging.

Here is a link that might be useful: Propagating Perennials

I thought sewer charges were assessed based on usage.

I think that even if you collect grey water, you will still pay sewer.

No I have a septic tank, thankful for no sewer charges which are out of this world on charges.