Bathing waters across England
Date
0 rivers are designated for bathing in England.
By the way, there are over 400 designated bathing waters across England. Just there is no place where the water quality of a river is monitored with respect to humans bathing. Generally, only levels to protect fish and wildlife are checked at specific locations.
Source: https://environmentagency.blog.gov.uk/2020/07/02/combined-sewer-overflows-explained/
