Wessex Water storm overflows in 2025

How many spills each outlet recorded

Outlets with a usable 2025 count, grouped by the number of spills. The longest bar is the largest group.

0

220 16.5%

1 to 9

394 29.6%

10 to 19

245 18.4%

20 to 39

269 20.2%

40 to 59

140 10.5%

60 or more

64 4.8%

Spills over time

The median outlet run by Wessex Water recorded 11 spills in 2025, against 11 across England.

1,204 outlets have a comparable count for both 2024 and 2025, with the monitor working at least 90% of each year. 94 recorded more spills, 969 fewer and 141 the same. Together they went from 41,894 to 22,967 spills, a fall of 45%.

Largest rises from 2024 to 2025

• Stoke St Gregory Storm Tank5 → 50
• Yeovilton Weir6 → 50
• Longbridge Fosse Way Inlet6 → 41

Earlier returns list fewer of these outlets, so totals are not comparable between years. The median per outlet and the like-for-like change are fairer comparisons. Counts are events, not volume.

Largest falls from 2024 to 2025

Only outlets with a count in both years and at least 90% monitor operation in each. Counts depend on rainfall as well as on the sewer network, so a fall does not show on its own that an overflow improved.

• Hurdcott Storm Tank310 → 167
• Coate Spaniels Bridge192 → 52
• Chew Stoke Walley Court Road Storm Tank258 → 139
• Shrewton Storm Tank235 → 116
• Bourton Silton Storm Tank180 → 62
• Horton Horton Farm189 → 75
• Fovant Storm Tank193 → 81
• Hanging Langford191 → 84
• Barford St Martin Burcombe Storm Tank185 → 81
• Winterbourne Watleys End In Field Off Factory Road116 → 14

Waterbodies with the most spills

Total 2025 spills from outlets the return links to each waterbody. A waterbody with more outlets will usually have a higher total.