Yes, it has been named a “contaminated site of national interest” (SIN). The waters and especially the shallower Venice lagoon was sampled and found to have “Grain-size, heavy metal, nutrient, and organic micropollutant concentrations were determined in the surface sediment layers (0-5 and 5-10 cm depths) of 51 sites.” (http://www.molecularstation.com/research/sediment-chemical-contamination-of-a-shallow-water-area-close-to-the-industrial-zone-of-porto-marghera-venice-lagoon-italy-17963790.html) Levels of Mercury were also found. Petroleum hydrocarbon due to fossil fuel combustion and untreated waste as marked by levels of a fecal sterol have also been found. Then of course there are high levels of petroleum contaminationfrom the heavy activity in the interior canals and around.
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