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Congressional District # 08


EPA ID# MID980994354
Last Updated: May, 2015

Site Description

The Tittabawassee River/Saginaw River & Bay Site includes areas in and along a 24-mile stretch of the Tittabawassee River south of the confluence of the Chippewa River, the 22-mile Saginaw River, and portions of the 1,143 square mile Saginaw Bay. The rivers and floodplains include natural, commercial, residential, and agricultural areas of Midland, Saginaw, and Bay Counties in Michigan. The Saginaw Bay watershed is one of Michigan's most diverse areas – its rich resources support agriculture, manufacturing, tourism, outdoor recreation, and a vast variety of wildlife. At this time it is unknown how much of the bay will need to be addressed. Dioxins and furans are the primary contaminants in sediment, riverbanks, and floodplain soil. These contaminants came from historical releases from the Dow Chemical Company’s Midland Plant. The City of Midland and the Midland Plant are not part of the Superfund Site because they are being addressed through Dow’s RCRA Hazardous Waste Management Facility Operating License issued by the Michigan Department of Environmental Quality (MDEQ).

The Site has been separated into two parts called operable units (OUs). The first operable unit (OU1) includes the Tittabawassee River and about 5 miles of the Upper Saginaw River, including the 6th Street turning basin. The second operable unit (OU2) includes the Lower Saginaw River and Saginaw Bay.

Site Responsibility

This Site is a Superfund alternative site being addressed through responsible parties' actions with federal and state oversight.

Threats and Contaminants

Floodplain soil, riverbanks, and sediment at the Site are contaminated with dioxins and furans. Dioxins and furans can bioaccumulate – meaning that these chemicals build up in the food chain. Eating contaminated fish and game, as well as frequent direct contact with contaminated soil or sediment are the primary exposure routes of concern to humans. Dioxins and furans may cause cancer or other health effects in humans. An additional 200 contaminants are monitored at the Site, including chlorobenzenes, parathions, chlorophenols, polynuclear aromatic hydrocarbons (PAHs), and arsenic. Fish consumption and wild game advisories for the Site were first issued in 1979 by the Michigan Department of Community Health and are still in effect.

Human access to the water bodies and sediment at the Site is unrestricted. Human access to floodplain areas varies, depending on the land use. Wildlife in the area also has unrestricted access. The Site is subject to flooding and erosion, particularly during high stream flow events. This may spread contamination to other locations within the floodplain, as well as downstream.

Cleanup Progress

EPA and MDEQ are taking a unique approach at the Site – combining EPA’s Superfund program and MDEQ’s RCRA Hazardous Waste program to optimize cleanup of five areas: Dow’s Midland Plant, the City of Midland, the Tittabawassee River, the Saginaw River, and Saginaw Bay. MDEQ has the lead on the city and the Midland Plant, and EPA has the lead on the rivers and bay, but both agencies are working as partners to complete the job.

EPA and MDEQ are overseeing work by the Dow Chemical Co. that will lead to the comprehensive cleanup of the Tittabawassee River, Saginaw River and Bay.

The Agencies targeted cleanup of soil, sediment and riverbank areas in and along the Tittabawassee and Saginaw Rivers. As of the end of 2014, more than 130,000 cubic yards of contaminated soil and river sediment were removed and safely disposed of. The amount of material removed could fill a football field five stories high. More than 4,000 gallons of DNAPL – a highly contaminated heavy liquid – were removed from the river bottom and destroyed. Four acres of contaminated river sediment were capped. And more than 1 mile of riverbank was made stable. Following is a summary of those cleanup projects:

Community Involvement

EPA, working with MDEQ, is committed to community involvement activities at the Site that are robust and go far beyond what is required by law. Activities include:


Remedial Project Manager, U.S. EPA
mary logan (logan.mary@epa.gov)
(312) 886-4699



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