![Alberto Pezzali A group of people swim in the river Thames in Henley-on-Thames, England, Friday, June 14, 2024. Britain has become notorious as a place where a casual swim could lead to an extended visit to the toilet, if not the hospital. A torrent of news on dirty water has spilled into next month's election to determine which party controls government for the next four or five years. (AP Photo/Alberto Pezzali)](https://mapi.associatedpress.com/v2/items/baf1205f5b2a47f28c4ac1f45dd99790/preview/preview.jpg?s=680x)
A group of people swim in the river Thames in Henley-on-Thames, England, Friday, June 14, 2024. Britain has become notorious as a place where a casual swim could lead to an extended visit to the toilet, if not the hospital. A torrent of news on dirty water has spilled into next month's election to determine which party controls government for the next four or five years. (AP Photo/Alberto Pezzali)
![Alberto Pezzali Susan Barry, left, and Jo Robb, members of the open water swimming group Henley Mermaids, exit the river Thames after a swim, in Henley-on-Thames, England, Friday, June 14, 2024. Britain has become notorious as a place where a casual swim could lead to an extended visit to the toilet, if not the hospital. A torrent of news on dirty water has spilled into next month's election to determine which party controls government for the next four or five years. (AP Photo/Alberto Pezzali)](https://mapi.associatedpress.com/v2/items/a941a7ca157946dd97f8335ace7006f0/preview/preview.jpg?s=680x)
Susan Barry, left, and Jo Robb, members of the open water swimming group Henley Mermaids, exit the river Thames after a swim, in Henley-on-Thames, England, Friday, June 14, 2024. Britain has become notorious as a place where a casual swim could lead to an extended visit to the toilet, if not the hospital. A torrent of news on dirty water has spilled into next month's election to determine which party controls government for the next four or five years. (AP Photo/Alberto Pezzali)
![Alberto Pezzali Susan Barry, member of the open water swimming group Henley Mermaids, swims in the river Thames, in Henley-on-Thames, England, Friday, June 14, 2024. Britain has become notorious as a place where a casual swim could lead to an extended visit to the toilet, if not the hospital. A torrent of news on dirty water has spilled into next month's election to determine which party controls government for the next four or five years. (AP Photo/Alberto Pezzali)](https://mapi.associatedpress.com/v2/items/81f9af2dd7154941a2d9a8de4d2ef6ca/preview/preview.jpg?s=680x)
Susan Barry, member of the open water swimming group Henley Mermaids, swims in the river Thames, in Henley-on-Thames, England, Friday, June 14, 2024. Britain has become notorious as a place where a casual swim could lead to an extended visit to the toilet, if not the hospital. A torrent of news on dirty water has spilled into next month's election to determine which party controls government for the next four or five years. (AP Photo/Alberto Pezzali)
![Alberto Pezzali Jo Robb, member of the open water swimming group Henley Mermaids, prepares for a swim in the river, in Henley-on-Thames, England, Friday, June 14, 2024. Britain has become notorious as a place where a casual swim could lead to an extended visit to the toilet, if not the hospital. A torrent of news on dirty water has spilled into next month's election to determine which party controls government for the next four or five years. (AP Photo/Alberto Pezzali)](https://mapi.associatedpress.com/v2/items/3aa12f388f60486482d0ee08b0117889/preview/preview.jpg?s=680x)
Jo Robb, member of the open water swimming group Henley Mermaids, prepares for a swim in the river, in Henley-on-Thames, England, Friday, June 14, 2024. Britain has become notorious as a place where a casual swim could lead to an extended visit to the toilet, if not the hospital. A torrent of news on dirty water has spilled into next month's election to determine which party controls government for the next four or five years. (AP Photo/Alberto Pezzali)
![Alberto Pezzali A view of a sign, in Henley-on-Thames, England, Friday, June 14, 2024. Britain has become notorious as a place where a casual swim could lead to an extended visit to the toilet, if not the hospital. A torrent of news on dirty water has spilled into next month's election to determine which party controls government for the next four or five years. (AP Photo/Alberto Pezzali)](https://mapi.associatedpress.com/v2/items/da09915d21904491bc632a9696e3f560/preview/preview.jpg?s=680x)
A view of a sign, in Henley-on-Thames, England, Friday, June 14, 2024. Britain has become notorious as a place where a casual swim could lead to an extended visit to the toilet, if not the hospital. A torrent of news on dirty water has spilled into next month's election to determine which party controls government for the next four or five years. (AP Photo/Alberto Pezzali)
![Alberto Pezzali Endurance swimmer Joan Fennelly, member of the open water swimming group Henley Mermaids, shows a map of the river Thames on her smartphone, in Henley-on-Thames, England, Friday, June 14, 2024. Fennelly and other members of the Henley Mermaids, a group of wild swimmers, now consult the Thames Water phone app that shows sewage releases. They also do the sniff test before jumping in. (AP Photo/Alberto Pezzali)](https://mapi.associatedpress.com/v2/items/76c91d1f0f8f400cbf21248edd091655/preview/preview.jpg?s=680x)
Endurance swimmer Joan Fennelly, member of the open water swimming group Henley Mermaids, shows a map of the river Thames on her smartphone, in Henley-on-Thames, England, Friday, June 14, 2024. Fennelly and other members of the Henley Mermaids, a group of wild swimmers, now consult the Thames Water phone app that shows sewage releases. They also do the sniff test before jumping in. (AP Photo/Alberto Pezzali)
![Alberto Pezzali A general view of the river Thames, in Henley-on-Thames, England, Friday, June 14, 2024. Britain has become notorious as a place where a casual swim could lead to an extended visit to the toilet, if not the hospital. A torrent of news on dirty water has spilled into next month's election to determine which party controls government for the next four or five years. (AP Photo/Alberto Pezzali)](https://mapi.associatedpress.com/v2/items/428edb1b4aa44023aa9033c6be1eaba4/preview/preview.jpg?s=680x)
A general view of the river Thames, in Henley-on-Thames, England, Friday, June 14, 2024. Britain has become notorious as a place where a casual swim could lead to an extended visit to the toilet, if not the hospital. A torrent of news on dirty water has spilled into next month's election to determine which party controls government for the next four or five years. (AP Photo/Alberto Pezzali)
![Alberto Pezzali Endurance swimmer Joan Fennelly, member of the open water swimming group Henley Mermaids, shows a map of the river Thames on her smartphone, in Henley-on-Thames, England, Friday, June 14, 2024. Fennelly is undaunted by frigid water and long distances, swimming year-round in the wild. But she takes extra precautions in her own backyard. The River Thames is one of Britain's many waterways contaminated with sewage and agricultural pollution. (AP Photo/Alberto Pezzali)](https://mapi.associatedpress.com/v2/items/92995f9c7f764b3685ffaa9269f8ecd3/preview/preview.jpg?s=680x)
Endurance swimmer Joan Fennelly, member of the open water swimming group Henley Mermaids, shows a map of the river Thames on her smartphone, in Henley-on-Thames, England, Friday, June 14, 2024. Fennelly is undaunted by frigid water and long distances, swimming year-round in the wild. But she takes extra precautions in her own backyard. The River Thames is one of Britain's many waterways contaminated with sewage and agricultural pollution. (AP Photo/Alberto Pezzali)
![Alberto Pezzali Endurance swimmers Joan Fennelly and Jo Robb, members of the open water swimming group Henley Mermaids, enter the river Thames, in Henley-on-Thames, England, Friday, June 14, 2024. Fennelly is undaunted by frigid water and long distances, swimming year-round in the wild. But she takes extra precautions in her own backyard. The River Thames is one of Britain's many waterways contaminated with sewage and agricultural pollution. (AP Photo/Alberto Pezzali)](https://mapi.associatedpress.com/v2/items/2e28b1ac4ab444299fc00a421ed30048/preview/preview.jpg?s=680x)
Endurance swimmers Joan Fennelly and Jo Robb, members of the open water swimming group Henley Mermaids, enter the river Thames, in Henley-on-Thames, England, Friday, June 14, 2024. Fennelly is undaunted by frigid water and long distances, swimming year-round in the wild. But she takes extra precautions in her own backyard. The River Thames is one of Britain's many waterways contaminated with sewage and agricultural pollution. (AP Photo/Alberto Pezzali)
![Alberto Pezzali Endurance swimmers Joan Fennelly and Jo Robb, members of the open water swimming group Henley Mermaids, prepare to enter the river Thames, in Henley-on-Thames, England, Friday, June 14, 2024. Fennelly is undaunted by frigid water and long distances, swimming year-round in the wild. But she takes extra precautions in her own backyard. The River Thames is one of Britain's many waterways contaminated with sewage and agricultural pollution. (AP Photo/Alberto Pezzali)](https://mapi.associatedpress.com/v2/items/94b4de6ed47d4c28834a1b7131984a9e/preview/preview.jpg?s=680x)
Endurance swimmers Joan Fennelly and Jo Robb, members of the open water swimming group Henley Mermaids, prepare to enter the river Thames, in Henley-on-Thames, England, Friday, June 14, 2024. Fennelly is undaunted by frigid water and long distances, swimming year-round in the wild. But she takes extra precautions in her own backyard. The River Thames is one of Britain's many waterways contaminated with sewage and agricultural pollution. (AP Photo/Alberto Pezzali)
![Alberto Pezzali Endurance swimmer Joan Fennelly, member of the open water swimming group Henley Mermaids, displays her swimming cap, in Henley-on-Thames, England, Friday, June 14, 2024. Fennelly is undaunted by frigid water and long distances, swimming year-round in the wild. But she takes extra precautions in her own backyard. The River Thames is one of Britain's many waterways contaminated with sewage and agricultural pollution. (AP Photo/Alberto Pezzali)](https://mapi.associatedpress.com/v2/items/dd8ae7ab78dd412fadaa35d8ed25792b/preview/preview.jpg?s=680x)
Endurance swimmer Joan Fennelly, member of the open water swimming group Henley Mermaids, displays her swimming cap, in Henley-on-Thames, England, Friday, June 14, 2024. Fennelly is undaunted by frigid water and long distances, swimming year-round in the wild. But she takes extra precautions in her own backyard. The River Thames is one of Britain's many waterways contaminated with sewage and agricultural pollution. (AP Photo/Alberto Pezzali)