remember low density residential doesnt need water this can be a huge saving. In my current city, all residential is low density no water, my commercial is low density / medium density, the low density stuff has no water. Insutrial is all high-tech (watered of course). services for my sims, im running 2 large elementry schools, 2 large high schools, a college, a university, about 4 libraries and 2 museums. health wise they have 2 large medical centers, a bunch of police and fire stations. all this and im still making 5K a month profit. i didnt even add water to the map until i had a fairly high demand for high tech and Commercial offices. once this demand was high i chose a spot far away from the dirty i had then. zoned for high tech and watered it and a close by commercial zone and upgraded some of that to medium density commercial and gave them some water. after awhile HT demand was increasing and Dirty/maufacturing was dropping, so i slowly started dezoning bits of my dirty and started zoning a little bit more high tech (do this gradually pay attention to demand). Now i have no dirty and am nearly ready to replace my coal power stations with solar power plants, and then ill almost be pollution free
