Leaky sewers are likely responsible for large amounts of medications in streams 5 years ago
I've looked at countless sewer inspection videos--those pipes can be up to 80 years old and are often in pretty bad shape. Sewage leaking into the groundwater is a major problem but is very hard to detect and locate unfortunately.
Shameless plug: We're a startup building AI to detect leakages in sewers and tell cities when to fix their underground pipes. If you want to help us solve this problem and make cities more sustainable, let me know at ew@hades.ai :)