Related by context. Frequent words. (Click for all words.) 60 sewage 58 Raw sewage 56 raw sewage 54 sewage effluent 54 stormwater drains 54 sewerage pipes 53 stagnant pools 53 Sewage 52 untreated sewage 52 polluted 52 waterborne illnesses 52 outfalls 51 heavily polluted 51 sewerage 51 water 51 clogged drains 51 sewage backups 51 rotting vegetation 51 polluted runoff 51 sewage overflows 50 sewage pipes 50 untreated wastewater 50 creeks rivers 50 overpowering stench 50 garbage heaps 50 drains 50 unbearable stench 49 bilharzia 49 toilets sinks 49 stormwater discharge 49 effluent 49 uncollected garbage 49 desilted 49 deplete oxygen 49 water reticulation 48 Ala Wai Canal 48 sewage overflow 48 sewage discharges 48 sewage treatment 48 corroded pipes 48 brackish 48 corrosives 48 effluents 48 drainage 48 nullahs 48 industrial effluents 47 Potable water 47 putrid smell 47 standpipes 47 outfall 47 bd.className + = 47 sanitary sewage 47 Seepage 47 storm drains 47 effluence 47 E coli bacteria 47 backflow 47 sanitary 47 polluted groundwater 47 watermains 47 indiscriminate dumping 47 Xijiang River 47 Polluted 46 river embankments 46 sewage disposal 46 overflowing rivers 46 Toxic chemicals 46 Algae blooms 46 lagoons 46 Acidic 46 Hydrogen sulfide 46 chlorination 46 ultraviolet disinfection 46 Pollutants 46 toxic algae blooms 46 rubbish dumps 46 putrefying 46 sewage spills 46 Tidal waves 46 litter strewn 46 faecal matter 45 sumps 45 contaminated 45 rivers lakes 45 brackish water 45 groundwater extraction 45 uncleaned 45 sewers 45 Ghaggar 45 drainage pipes 45 stormwater drain 45 sewer pipes 45 Soil erosion 45 overflowing toilets 45 bleaching powder 45 sewage lagoon 45 sewer overflows 45 leaky pipes 45 Contaminated 45 sidewalks driveways 45 wastewater