plastic waste and litter cover the shoreline beneath dark storm clouds

water contamination environmental pollution quality industrial waste sewage disposal chemical spills agricultural runoff oil toxic substances wastewater treatment groundwater marine urban nutrient microplastics heavy metals pesticide eutrophication pharmaceutical radioactive point source nonpoint plastic stormwater sediment acid rain algal blooms dead zones thermal cyanobacteria gas drilling landfills illegal dumping pharmaceuticals personal care products ppcps chlorinated solvents coal ash mercury pcbs polychlorinated biphenyls endocrine disruptors fracking chemicals microbeads urbanization effects disinfection byproducts lead pipes depletion mining habitat destruction drainage