An 'autopsy' performed on a giant, sewer-dwelling London fatberg has revealed that it harbours masses of thriving bacteria (https://www.theguardian.com/uk-news/2018/apr/24/fatberg-autopsy-reveals-growing-health-threat-londoners).Unremarkably, the bacteria include listeria and good old E. coli with some being antibiotic resistant strains. The 'creature' (one was the weight of 11 double-decker buses and two football fields in length) is largely comprised of cooking fat being poured down drains where it collects human waste. It is pretty obvious that these obstructions could be dangerous to health (and not only that of the sewer-men who have to deal with it). There really needs to be a collection method for removing waste domestic and restaurant cooking fats (they could be used, with carbon-capture, to heat buildings) and substantial penalties for people who simply flush it away down drains.
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