Remediation Town: Science Fiction

The algal bloom was a deep purple, and the town cheered. Their remediation had been successful; they could incorporate a town on the edge of the lake and fish in it and bathe in its water and drink from it (after proper filtration, of course). They had been a wandering town for so long, with three failed remediation attempts behind them, that this was cause for celebration. And the town was between a long stretch with no other places nearby, so their town would make a natural waystation.

Inspiration: A Science Friday podcast about a winning science project that used algae as biological indicators.
Story Potential: High.
Notes: I love the idea of towns forming and then being a migrant town until they find a place they can remediate successfully enough to live there. Post-apocalypse-lite. Kinda a Western feel to it. Caravans of a town. Towns coming to other towns as they're on their search. Of course, this is only a setting, not a story.