Overview
Ann Arbor WWTP serves approximately 150,000 people in Ann Arbor Charter Township, Michigan. The plant discharges treated wastewater into the Huron River, a tributary of Lake Erie.
Ann Arbor WWTP is a municipal wastewater treatment facility located in Ann Arbor Charter Township, Washtenaw County, Michigan. The plant serves a population of approximately 149,690, making it a large agglomeration under US regulatory frameworks. It operates under the US Clean Water Act, which requires National Pollutant Discharge Elimination System (NPDES) permits for all discharges to surface waters. As a large facility serving over 100,000 people, Ann Arbor WWTP is expected to provide at least secondary treatment, as mandated by the Clean Water Act. Typical plants of this scale employ advanced treatment technologies to meet stringent effluent limits for nutrients and other pollutants. The plant discharges treated effluent into the Huron River, which flows southeast through Michigan and empties into Lake Erie via the Detroit River. The Huron River watershed supports diverse aquatic life and provides recreational opportunities. The plant's discharge is regulated to protect downstream water quality and the ecological health of Lake Erie, which has experienced harmful algal blooms linked to nutrient pollution.
Environmental context
The Ann Arbor WWTP discharges into the Huron River, a tributary of the Detroit River, which flows into Lake Erie. Lake Erie is the shallowest and most biologically productive of the Great Lakes, supporting a major fishery and providing drinking water for millions. The watershed is ecologically sensitive due to nutrient loading concerns, and the plant's discharge is subject to strict phosphorus limits to mitigate algal blooms.
Frequently asked questions
Ann Arbor WWTP is located in Ann Arbor Charter Township, Washtenaw County, Michigan, United States, along the Huron River Greenway.
The plant serves approximately 149,690 people, classifying it as a large municipal wastewater treatment facility.
The plant discharges treated effluent into the Huron River, which flows to the Detroit River and ultimately into Lake Erie.
The plant operates under the US Clean Water Act, requiring an NPDES permit issued by the Michigan Department of Environment, Great Lakes, and Energy (EGLE).
Plants of this scale typically provide at least secondary treatment, and often include advanced nutrient removal to meet EPA guidelines for phosphorus and nitrogen, especially in sensitive watersheds like the Great Lakes basin.
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