General Impact
Barreto et al. (2000) state that, "In southeast Brazil E. densa, together with E. najas, causes great annual losses to the hydroelectric companies. Interruptions of electricity generation and damage to grids and equipment are common in reservoirs belonging to CESP in São Paulo." The Washington State Department of Ecology (2003) states that, "E. densa forms dense mono-specific stands that restrict water movement, trap sediment, and cause fluctuations in water quality. Dense beds interfere with recreational uses of a water body by interfering with navigation, fishing, swimming, and water skiing." Champion and Tanner (2000) state that in New Zealand, "E. densa exhibited the ability to rapidly recolonise de-vegetated areas following floods in the Whakapipi Stream and may be considered to be 'adversity selected' (Whittaker & Goodman, 1979, in Champion and Tanner 2000)."
Location Specific Impacts:Hawkesbury-Nepean River (Australia) 
Modification of natural benthic communities: Growns et al. (2003) state that, "Egeria is likely to harbour a different fish assemblage than beds of native macrophyte species." Itaipu Reservoir (Brazil)
Economic/Livelihoods: Barreto et al. (2000) states that, "In southeast Brazil Egeria densa, together with E. najas, causes great annual losses to the hydroelectric companies."
Human nuisance: Barreto et al. (2000) states that, "Interruptions of electricity generation and damage to grids and equipment are common in reservoirs belonging to CESP in São Paulo which are infested with E. densa." Sao Paulo (Brazil)
Economic/Livelihoods: Barreto et al. (2000) states that, "In southeast Brazil Egeria densa, together with E. najas, causes great annual losses to the hydroelectric companies."
Human nuisance: Barreto et al. (2000) states that, "Interruptions of electricity generation and damage to grids and equipment are common in reservoirs belonging to CESP in São Paulo which are infested with E. densa." Brazil
Economic/Livelihoods: Barreto et al. (2000) states that, "In southeast Brazil Egeria densa, together with E. najas, causes great annual losses to the hydroelectric companies."
Human nuisance: Barreto et al. (2000) states that, "Interruptions of electricity generation and damage to grids and equipment are common in reservoirs belonging to CESP in São Paulo which are infested with E. densa." Lake Biwa (Japan)
Physical disturbance: Hamabata and Kobayashi (2002) state that, "Another water weed, Egeria densa, appeared in Lake Biwa in 1969 (Miura 1980), and its distribution peaked during the 1970s when the submerged plant zone in the southern basin was covered exclusively by this species (Tanimizu & Miura 1976)." Whakapipi Stream (New Zealand)
Modification of hydrology: Champion and Tanner (2000) state that in New Zealand, "Egeria densa exhibited the ability to rapidly recolonise de-vegetated areas following floods in the Whakapipi Stream and may be considered to be 'adversity selected' (Whittaker & Goodman, 1979, in Champion and Tanner 2000)." Washington (United States (USA))
Human nuisance: The Washington State Department of Ecology (2003) states that, "Egeria densa forms dense beds that interfere with recreational uses of a waterbody by interfering with navigation, fishing, swimming, and water skiing."
Modification of hydrology: The Washington State Department of Ecology (2003) states that, "Egeria densa forms dense monospecific stands that restrict water movement, trap sediment, and cause fluctuations in water quality."
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