National Invasive Species Act & Aquatic Nuisance Prevention

The Nonindigenous Aquatic Nuisance Prevention and Control Act of 1990 (16 U.S.C. §§ 4701–4751), as amended by the National Invasive Species Act of 1996, is the primary federal law addressing the prevention and control of invasive aquatic species — organisms introduced from foreign ecosystems that establish themselves in U.S. waters and cause ecological and economic harm. Enacted in direct response to the zebra mussel invasion of the Great Lakes (which caused billions of dollars in damage to water infrastructure, native mussels, and fisheries), the Act created an interagency Aquatic Nuisance Species Task Force, mandated ballast water management for ships entering U.S. waters, and authorized state management plans for combating aquatic invasives. The economic cost of invasive species in the United States is estimated at $120+ billion annually across all sectors — from agriculture to infrastructure to ecosystems.

Current Law (2026)

Legal Authority

• 16 U.S.C. § 4701 — Findings and purposes (Congress found that ballast water discharge from ships is a primary pathway for introducing nonindigenous aquatic species; invasive species threaten native biodiversity, fisheries, and water infrastructure; prevention is the first line of defense)
• 16 U.S.C. § 4702 — Definitions (defines "aquatic nuisance species" as a nonindigenous species that threatens native species, ecosystems, or human uses of water; "ballast water" as water taken on board to control stability, list, and trim; "introduction" as release into open U.S. waters; clear definitions guide regulatory scope)
• 16 U.S.C. § 4711 — Ballast water management (Coast Guard must issue regulations requiring vessels equipped with ballast water tanks to carry out exchange or treatment of ballast water before discharge in U.S. waters — the primary regulatory tool for preventing ship-borne introductions)
• 16 U.S.C. § 4712 — National ballast water management information (requires studies, surveys, and a national data center to track ballast water pathways and nonindigenous species introductions)
• 16 U.S.C. § 4721 — Aquatic Nuisance Species Task Force (creates an interagency task force co-chaired by FWS and NOAA to coordinate federal prevention, monitoring, control, and research efforts)
• 16 U.S.C. § 4722 — Aquatic nuisance species program (Task Force must develop and implement a national program to prevent introduction, monitor spread, control established populations, conduct research, and share information)
• 16 U.S.C. § 4724 — State aquatic nuisance species management plans (states may develop plans addressing prevention, detection, rapid response, and control; approved plans receive federal funding assistance)

How It Works

Ballast water management is the Act's primary regulatory tool. Transoceanic cargo ships take on ballast water (for stability) in foreign ports — water that can contain thousands of species of organisms. When discharged in U.S. ports, these organisms may establish invasive populations. The Coast Guard requires all vessels with ballast tanks to manage their ballast water before discharge — either through open-ocean exchange (replacing coastal ballast water with open-ocean water, which contains fewer species adapted to coastal environments) or through ballast water treatment systems (using filtration, UV treatment, or chemical disinfection to kill organisms). Treatment standards have become increasingly stringent, with vessels required to meet discharge standards limiting the concentration of living organisms.

The Aquatic Nuisance Species Task Force coordinates the federal response across 13 agencies. The Task Force develops a national program for prevention, monitoring, control, and research; reviews and approves state management plans; establishes regional panels that coordinate among federal, state, tribal, and local entities; and identifies research priorities. The six regional panels (Great Lakes, Gulf/South Atlantic, Northeast, Western, Mid-Atlantic, Mississippi River Basin) address region-specific invasive species threats.

State management plans are a key delivery mechanism. States develop plans addressing specific invasive species threats within their borders — prevention strategies, early detection and rapid response protocols, control and eradication methods, public education, and coordination with neighboring states. The Task Force reviews and approves state plans; approved plans receive federal funding to support implementation. As of 2026, most states with significant aquatic invasive species challenges have approved plans.

The Act emphasizes prevention as the most cost-effective strategy — stopping invasive species before they arrive is far cheaper than trying to control or eradicate established populations. Once a species like the zebra mussel becomes established across a large geographic area, eradication is essentially impossible; management shifts to damage mitigation. This reality drives the focus on ballast water management, border inspection, and early detection.

The Lacey Act's "injurious wildlife" provisions (18 U.S.C. § 42) complement the NISA framework by prohibiting the importation of species designated as injurious to human beings, agriculture, wildlife, or wildlife resources. Species listed as injurious under the Lacey Act cannot be imported or transported across state lines — providing a legal tool for preventing intentional introductions of known invasive species through the pet trade, aquaculture, and other pathways. See also Plant Protection & Quarantine for plant-specific invasive species controls.

How It Affects You

If you boat, fish, or kayak on multiple water bodies, you are one of the primary vectors spreading aquatic invasive species — inadvertently, but legally consequentially. Zebra mussels and quagga mussels attach to hull surfaces, anchor chains, bilge equipment, and live wells; a single contaminated boat can establish a new infestation in a previously clean lake. The Clean-Drain-Dry protocol is the national prevention standard: remove all visible aquatic plants, animals, and mud from your boat and equipment before leaving a water body; drain all water from live wells, bilges, and motor cooling systems; and dry everything for at least 5 days (or use a 104°F or higher pressure wash) before launching in a different water body. Many states now require you to stop at mandatory boat inspection stations before launching — if you refuse or are found with prohibited material, you can face fines ranging from $100 to $5,000 depending on the state, and your launch can be denied. Minnesota, Wisconsin, Colorado, and Washington operate particularly rigorous inspection programs. Look up your destination lake before you go: maisrc.umn.edu (Minnesota Aquatic Invasive Species Research Center) and your state's fish and wildlife agency website typically maintain infestation maps showing which water bodies are already affected and which are high-priority for prevention.

If you live, fish, work, or depend on water infrastructure in the Great Lakes region, aquatic invasive species are one of the most significant and costly environmental challenges you face. Zebra and quagga mussels — introduced via ballast water in the 1980s — have altered the entire food web, filtered out the phytoplankton that forms the base of the food chain, contributed to the collapse of several native fish populations, and clogged municipal water intake pipes across the region. The cost of mussel control at a single large water treatment plant can run into the millions per year. Asian carp (bighead, silver, grass, and black carp) pose an existential threat to the Great Lakes ecosystem if they become established — the Brandon Road Interbasin Project (an Army Corps of Engineers project near Joliet, Illinois using electric barriers, underwater sound, air bubble curtains, and flushing locks) is designed specifically to block their upstream migration from the Illinois River watershed. The project has received bipartisan federal funding but faces implementation delays. Track the Brandon Road project status at glc.org (Great Lakes Commission) and invasivecarp.gov. Sea lamprey — an eel-like parasite that attaches to lake trout and other fish — is controlled through a coordinated U.S.-Canada program using lampricide treatments in Great Lakes tributaries; the Great Lakes Fishery Commission (glfc.org) coordinates this effort.

If you operate commercial vessels — cargo ships, tankers, bulk carriers, or other vessels with ballast tanks — in U.S. waters, Coast Guard ballast water management regulations (33 CFR Part 151) require you to manage ballast water to prevent the discharge of living aquatic organisms. The requirements depend on when and where your vessel operates: vessels operating exclusively in the same COTP zone may have simpler requirements; vessels that operate in multiple COTP zones or on international routes must meet the EPA Vessel Incidental Discharge Act (VIDA) standards, which set limits on the concentration of living organisms in discharged ballast water. Newer vessels and those undergoing major reconstructions are required to install type-approved ballast water treatment systems — filtration, UV, or chemical disinfection — rather than relying on the older ocean-exchange approach. Type-approved systems must be certified by the Coast Guard (uscg.mil/national-pollution-funds-center/responses/ballastwater). Non-compliance with ballast water management requirements can result in civil penalties up to $25,000 per day and port state control detention. International vessels are also subject to the IMO's Ballast Water Management Convention, which the U.S. VIDA framework closely tracks.

If you operate a business importing, selling, or breeding live aquatic animals — fish, reptiles, amphibians, invertebrates — the Lacey Act's injurious wildlife provisions (18 U.S.C. § 42) are your primary federal compliance concern. Species listed as "injurious to human beings, to the interests of agriculture, horticulture, forestry, or to wildlife or the wildlife resources of the United States" may not be imported or transported across state lines. The list includes several dozen species — including bighead and silver carp, certain snakehead fish species, crayfish, mussels, and some salamanders. Violating the Lacey Act injurious wildlife provisions carries criminal penalties up to 6 months imprisonment and $5,000 per violation (civil penalties are also available). Importantly, the U.S. Fish & Wildlife Service has been slow to add new invasive species to the injurious list because the listing process is time-intensive and subject to legal challenge — there's often a gap between when scientists identify a species as a serious invasion risk and when it gets listed. Stay current on the injurious wildlife list at fws.gov/injurious-wildlife and verify any new import or breeding program against both the federal list and your state's prohibited species list before investing in inventory.

Aquatic invasive species management intersects with the Clean Water Act, particularly the ballast water discharge standards that aim to prevent introduction of nonnative organisms.

State Variations

Federal invasive species law sets the framework; states implement much of the on-the-ground work:

• Most states have their own invasive species laws, councils, and management plans
• State boat inspection and decontamination programs vary — some are mandatory, others voluntary
• State lists of prohibited/regulated species complement federal Lacey Act designations
• Great Lakes states have the most comprehensive state-level invasive species programs, driven by the severity of the threat
• Interstate coordination is critical — invasive species don't respect state boundaries

Implementing Regulations

• 50 CFR Part 16 — Injurious wildlife (Lacey Act designations restricting importation of injurious species)
• 7 CFR Part 301 — APHIS domestic quarantine notices (regulated pests, movement restrictions, treatment requirements)
• 33 CFR Part 151 — Ballast water management (vessel discharge standards to prevent aquatic invasive species introduction)

Pending Legislation

• S 3985 — State Boating Act: address watercraft decontamination and inspection programs to prevent spread of aquatic invasive species. Status: Introduced.
• S 4067 — Land Grant Research Prioritization Act: prioritize invasive species research at land-grant institutions. Status: Introduced.
• HR 7940 — SAFE Pathways Act: address invasive species pathways and prevention. Status: Introduced.
• HR 7560 — LCBP Enhancements Act: enhance Lake Champlain Basin Program including invasive species management. Status: Introduced.

Recent Developments

The fight against Asian carp (bighead, silver, grass, and black carp) in the Mississippi River basin — and the effort to prevent their establishment in the Great Lakes — has been a dominant focus. The Army Corps of Engineers' Brandon Road Lock and Dam project in Illinois is designed to serve as an invasive species barrier, using multiple technologies (electric barriers, underwater sound, air bubble curtains, flushing lock) to block upstream movement. The Coast Guard's ballast water discharge standard has been implemented, requiring treatment systems on an increasing number of vessels. PFAS and microplastics have emerged as new concerns in ballast water. Climate change is expanding the range of invasive species — warmer temperatures allow tropical and subtropical species to survive in previously inhospitable northern waters.