Not Social Commentary
The water swept in from the Northeast, so if any house is currently flooded, and it has neighbors to the North or East, it's a safe bet they're flooded too. (Other than this fact, and the grid layout, you should disregard the specifics of the map given.)
The water is low and flooded houses are still livable, but they need tap water. In a show of social cohesion befitting Grid City, each non-flooded household immediately donates 50 gallons of water to the effort. The goal is to distribute this water evenly among the flooded houses, and there is no shortage of volunteers to help. Also, quantities of water can be poured and combined or subdivided with precision.
But water is heavy and, let us say, has to be carried around on foot, so some plan is needed. An ideal of efficiency would be that water is never carried in the South or West directions.
Can both objectives be met simultaneously?
In the next post, I'll explain how this puzzle came up and my solution. But I'm curious to hear other approaches first, if you care to try.