River downstream of a manufacturing plant showed elevated heavy‑metal concentrations.

Implemented a closed‑loop cooling system, reducing discharge by 85% and restoring compliance with state water standards.

Municipal wastewater treatment plant exceeded nitrogen limits.

Designed a biological nutrient removal process, cutting nitrogen effluent by 70%.

Groundwater monitoring wells indicated high nitrate levels near agricultural fields.

Introduced controlled‑release fertilizer practices, decreasing nitrate leaching by 60%.

Stormwater runoff caused frequent flooding in a coastal community.

Installed green infrastructure (rain gardens, permeable pavements), reducing peak runoff by 40%.

Industrial effluent caused fish die‑offs in a local lake.

Implemented real‑time effluent monitoring and automated treatment adjustments, eliminating fish mortality incidents.