I went on line to see my billing history since 2006. http://www.cityofmadison.com/water/
then click on MyWater at the right, in blue.
You have to register, and to do that you'll need your account number and customer number, which are on your bill.
My history didn't show a big increase. In fact, it looks like this, starting in early 2007:
8/24/2011 $.00 $148.22 $148.22
2/22/2011 $.00 $158.23 $158.23
8/24/2010 $.00 $147.45 $147.45
2/19/2010 $.00 $144.07 $144.07
8/24/2009 $.00 $126.29 $126.29
2/23/2009 $.00 $125.73 $125.73
8/25/2008 $.00 $123.12 $123.12
2/22/2008 $.00 $119.71 $119.71
8/27/2007 $.00 $119.92 $119.92
2/22/2007 $.00 $112.37 $112.37
(The last two columns are the same because they are Current Bill and Bill Total and I always paid in full.)
This is for a household of one person, and I don't water my lawn. I got a new low-water-usage toilet this year which might account for the decrease in the newest bill.
My most recent bill, which I have on paper here, is from February and has the storm water pervious/impervious charges. If you feel these are in error on your bill you can submit a request to get them changed, which I did successfully at my old house because I had a pervious driveway installed replacing an impervious one.
The charge is based on the square footage of your property which is lawn or garden (pervious) versus the percentage that's impervious, which is your sidewalk/driveway/paved patio etc. If you feel the areas on your bill don't fairly represent conditions on your property, why not pull up the Google Earth view and recalculate the areas based on what it shows? I think I did it with AutoCAD but you could do the same thing using a grid system or simple geometry with a few on-site measurements. I'm not sure how they handle stuff like a patio that drains into the back yard lawn not the driveway, but they surely have guidelines to follow, and if you feel your allocated percentages make no sense it won't hurt to ask or to appeal.
The idea behind this charge is to have the property owner pay for his/her usage of the storm water system based on the area draining into the street. They want to minimize storm water runoff and the way that's done is increasing the landscaped area where the water soaks in. I got my runoff percentage close to zero at my old place, so it can be done. I don't see why this is a perverse incentive.