Clean water and wastewater follow a cyclical path as water is purified, consumed, discharged, treated and returned to the water system to follow its natural course and begin the cycle again.

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Monitoring water quality is a major and continuous responsibility at the Northeast Ohio Regional Sewer District. The Water Quality and Industrial Surveillance group (WQIS) periodically samples the waters of Cuyahoga River and Lake Erie to ensure that pollutants and bacteria are below specified threshold limits for the safety and health of service area residents and visitors.

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A watershed is an area of land that drains into a particular stream or waterway. Each watershed is characterized by its own unique drainage network, similar to the branches of a tree.

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