Sewage Map is great. You can get a great picture of the scale of the problem in the UK at https://top-of-the-poops.org https://top-of-the-poops.org It shows

Sewage Map is great. You can get a great picture of the scale of the problem in the UK at https://top-of-the-poops.org https://top-of-the-poops.org It shows live and historic sewage dumps for the last 5 years for constituencies, beaches & shellfish areas...