Related by context. Frequent words. (Click for all words.) 62 nutrient runoff 61 sewage discharges 59 pollution 57 dischargers 57 sediment runoff 56 polluted runoff 56 effluent discharge 56 pollutants 55 pollutant 53 wastewater discharge 53 SO2 emissions 53 wastewater discharges 53 sedimentation 52 pollutant emissions 52 nutrient pollution 51 sediment 51 aquifer recharge 51 aquatic ecosystem 50 shoreline erosion 50 waterways 49 stormwater runoff 49 Clean Water Act 49 air pollution 49 soil erosion 49 stormwater pollution 49 environmental 49 pollutions 49 discharges 49 dissolved solids 49 aquatic habitat 49 aquatic ecosystems 48 wildlife habitat 48 turbidity 48 sewage overflows 48 polluted waterways 48 woody debris 48 smokestack emissions 48 dissolved oxygen levels 48 watersheds 48 groundwater recharge 48 rivers lakes 47 total dissolved solids 47 sulfur dioxide nitrogen oxides 47 eutrophication 47 tidal wetlands 47 toxic pollutants 47 aquatic habitats 47 streambeds 47 stormwater 47 rainwater runoff 47 mercury pollution 47 salinity 47 wastewater 47 groundwater pumping 47 oxygen depletion 47 freshwater 47 suspended solids 46 silt 46 Sulfur dioxide 46 headwater 46 groundwater 46 effluents 46 estuaries 46 effluent 46 toxic algae blooms 46 freshwater ecosystems 46 freshwater wetlands 46 polluters 46 wetlands 46 livestock manure 46 acid rain 46 sewer overflows 45 Pollution 45 wetland restoration 45 siltation 45 nitrogen oxide NOx 45 mercury emissions 45 sulfur dioxide 45 untreated wastewater 45 Sediment 45 industrial effluents 45 nitrogen phosphorus 45 exceedances 45 acidification 45 phosphorus 45 TMDL 45 acidifying 45 sulfur dioxide emissions 45 clearcutting 45 creeks rivers 45 combined sewer overflows 45 fine particulates 45 Sediments 45 polluter 45 ocean acidity 45 hydrological 44 sulfur dioxide SO2 44 timber harvesting 44 habitat restoration 44 emission 44 impervious surfaces