Throughout the city there are little fenced off buildings with the logo of the city's Wastewater department on metal signs in front of them or on the door. The buildings are identified by the signs as being anything from water testing buildings to pumping substations, and by and large, this is what they are. However, about half a dozen of these buildings actually contain something else.
Four of these buildings are part of the city's actual water treatment system. They contain pumps that push the city's water through thin grilles made from human bone. The calcium from these bone filters is why Calgary's water is so often hard. The filters clean the water not only of contaminants, but of the city's collective sin for its involvement in the oil industry. The other two are shacks that contain taps.
One of these buildings is where the filters are installed when they're full. The water from the tap passes through all of the filters and emerges brackish and foul. Drinking it, however, is the only way to permanently purify the city's soul. The other building contains a tap that dispenses water so pure that any scars, mutations, cancers or birth defects will vanish.