Cuyahoga County, Ohio: drinking water report. Cuyahoga County – Cleveland and its inner-ring suburbs – draws water from Lake Erie, serving about 1.2
Cuyahoga County – Cleveland and its inner-ring suburbs – draws water from Lake Erie, serving about 1.2 million residents through the Cleveland Division of Water and several smaller suburban systems. Lake Erie is the shallowest and warmest of the Great Lakes, which makes it both highly productive biologically and more susceptible to contamination and algal blooms than its deeper neighbors.
Harmful algal blooms in Lake Erie's western basin produce microcystins that Cleveland's treatment plants must remove. While Cleveland's intake is in the central basin (less affected than the western basin), bloom events can push toxins eastward. The Ohio EPA requires enhanced monitoring during bloom season.
UCMR5 data shows low-level PFAS detections in Cuyahoga County water systems. Cleveland's industrial heritage – the Cuyahoga River famously caught fire in 1969 – left legacy contamination in sediments and groundwater throughout the county. According to the Ohio EPA's 2024 compliance reports, the Cleveland system met federal standards but aging distribution infrastructure remains a concern. An estimated 73,000 lead service lines are still in service in the Cleveland system, according to a 2023 city inventory.
Lake Erie provides an abundant source, but lead from old service lines and building plumbing is the primary household-level risk in Cuyahoga County.
Check your water for monitoring data specific to your area. A filter certified for both lead and PFAS reduction offers the broadest protection. Our water filter guide covers which types do both effectively. Pull your detailed report for historical data, and see our Ohio page for statewide context.