Springfield, IL – Hydrilla, a highly invasive aquatic plant, has been confirmed in DuPage County, marking its first known presence there and only the second report in Illinois.
The fast-growing plant, which can form dense mats of vegetation, poses serious threats to boating, fishing, swimming, and native wildlife. According to the Illinois Department of Natural Resources (IDNR), hydrilla’s impacts also extend to property values and waterway health, with control efforts potentially costing millions over several years.
The IDNR is coordinating with state and local agencies to track its spread and devise containment strategies. Officials noted hydrilla is often confused with the native Elodea species, but its toothed leaf edges and whorls of more than three leaves around the stem are distinguishing features.
Authorities believe the hydrilla in DuPage County may have been unintentionally released from aquariums or water gardens. The plant, classified as a federal noxious weed, is illegal to buy, sell, or transport.
The public is urged to help prevent its spread by cleaning equipment used in waterbodies, draining water from boats, and avoiding the release of aquarium plants into local waterways. Suspected sightings should be reported to the IDNR Aquatic Nuisance Species Program at dnr.ans@illinois.gov.
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