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In Iowa, alluvial aquifers near major rivers are a source of water for many communities. The City of Cedar Rapids withdraws water from wells completed in the Cedar River alluvium, a shallow alluvial aquifer adjacent to the Cedar River. The City of Cedar Rapids is located within Linn County in east-central Iowa, and water for the City is supplied by four well fields (East, Northwest, Seminole, and West well fields) along the Cedar River. The City has a population of about 121,000, and several large industries are major water users. Currently, per capita water usage in the City is nearly three times the national average. The City is committed to providing both a high quality and quantity of water to its customers. The USGS and Cedar Rapids Water Department have been working together in an ongoing research program to better understand water quality and flow in the Cedar River and alluvial well fields. Work has been done on both a basin and well-field approach and has involved dye tracing/time-of-travel studies on the Cedar River, water-quality sampling, geochemical modeling, and groundwater-flow modeling.