Thornton Reservoir Near Capacity Raises Flood Concerns and Odor Complaints
Thornton Reservoir Near Capacity Raises Flood Concerns and Odor Complaints
US · Published Jul 8, 2026
The Thornton Composite Reservoir in Illinois has reached 94% capacity following heavy rainfall over the weekend, marking its highest level since becoming operational in 2015, according to the Metropolitan Water Reclamation District of Greater Chicago.
The reservoir, which serves 14 communities and holds up to 7.9 billion gallons of water, is emitting a strong sewage odor that has intensified due to its near-full state.

Impact & Risks

The reservoir's near-capacity state poses a heightened risk of overbank flooding and combined sewer overflows for the 556,000 residents in the 14 communities it serves, including Chicago's Far South Side, Dolton, and South Holland. The odor from the reservoir is affecting the quality of life for nearby residents, with complaints of a 'putrid' smell. Local officials have warned that additional rainfall could exacerbate the situation, and infrastructure upgrades to address flooding may take years and significant funding.

Related News