WOW!!!! I use well water, my bill is always zero, but I have to maintain it. When I lived in town my combined Water, street cleaning, garbage service, recycling service never amounted to more than $60 in any month, even if i left the sprinkler on for 30 hours. You either use a whole lotta water, or its really friggin expensive where you live.You have to flush 100 times everyday for a month then you will see...but anyway...I'm using my winter bill for my math... for the summer is different due to pool being drained and filled and from lawn care (watering)..but on the norm my water bill used to be about 142-145 before putting 2 liter bottles in ALL my toilet tanks...Now it comes in at 120-123...by my math that averages around 16% give or take 1-2%..
Most of the time I just whip it out and piss somewhere on my farm, wherever I happen to be. Still have an old outhouse too, don't use it much cept when company comes over and both house bathrooms occupied though.