This is a pretty cool way to present what that map portrayed. It may not be feasible to implement, given your limited time and scope for the project, but it might be cool to draw districts around each pump, with borders indicating which areas are most likely to depend on it as their primary water source. I’d imagine it’d look something like Vornoy noise, with districts containing a contaminated water supply being filled with cases, while those that don’t are rather sparse.
tldr: Cool Map 🤩