The U.S. and Canada limited the use of phosphate laundry detergents and cracked down on Great Lakes pollution from industry and municipal sewage systems four decades ago.

NPR: Report Predicts Ever-Bigger Lake Erie Algae Blooms

Of three possible municipal wastewater (sewage) effluents evaluated as a source of N and P, the most effective was source-separated urine with a very high content of these elements, in which case growing algae became more environmentally beneficial than the land-based crops.

FORBES: Report Says Algal Biofuels May Not Cut Carbon Emissions, But Read More Closely

While the source of water currently received by the Hubli-Dharwad Municipal Corporation is filtered, sewage leakage and the poor management of waste often contaminates drinking water on its way into the homes.

CNN: Students work to improve water quality in India