Overflow history upstream of River Ribble at Edisford Bridge
The spot's forecast · For event organisers
This page lists the monitored storm overflows upstream of this spot and how often each spilled in each year. It is not a water test, and it does not say whether the water is fit to swim in. It does not include farm runoff, misconnected drains, treated sewage effluent, wildlife or overflows without a monitor. A year's count depends on how long the monitor worked, shown as monitor uptime.
Each year, all overflows upstream
| Year | Overflows with a return | Spills | Spill hours | Spill hours, weighted by reach |
|---|---|---|---|---|
| 2021 | 19 | 1,003 | 10,866 | 322 |
| 2022 | 18 | 805 | 8,666 | 284 |
| 2023 | 25 | 1,578 | 16,118 | 1,163 |
| 2024 | 25 | 1,491 | 10,955 | 789 |
| 2025 | 25 | 993 | 7,015 | 499 |
Reach is the share of a spill's bacteria SwimSignal's model expects to arrive here, after die-off on the way and dilution by the river. Weighting by it counts an hour of spilling just upstream for far more than one 40 km away. Spills are counted by the Environment Agency's 12/24 method: any discharge in the first 12 hours counts as one spill, then one more for each 24 hours with any discharge. How reach is worked out.
The overflows, by reach
All 25, the one whose spills matter most here first. Hours away is how long sewage takes to arrive at the model's river speed.
| Overflow and id | Company | km upstream | Hours away | Reach | Spills 2023 | Spills 2024 | Spills 2025 | Spill hours 2025 | Monitor uptime 2025 |
|---|---|---|---|---|---|---|---|---|---|
| Stirk House Hotel pumping station overflow Stirk House Hotel PS · UUP01858 | United Utilities | 15.0 | 8 | 32% | 76 | 79 | 46 | 416 | 99% |
| Gisburn sewage works overflow Gisburn WwTW · UUP00795 | United Utilities | 16.4 | 9 | 30% | 116 | 123 | 96 | 516 | 100% |
| Gisburn sewage works overflow Gisburn WwTW · UUP00796 | United Utilities | 16.4 | 9 | 30% | 40 | 34 | 15 | 144 | 100% |
| Settle sewage works overflow Settle WwTW · UUP01737 | United Utilities | 37.3 | 21 | 6% | 54 | 71 | 59 | 446 | 99% |
| Bolton by Bowland UUP02199 | United Utilities | 13.4 | 7 | 5% | 21 | 0 | 25 | 130 | 95% |
| Gildersleets Lane storm overflow Gildersleets Lane CSO · UUP00789 | United Utilities | 38.1 | 21 | 5% | 0 | 0 | 1 | 0 | 97% |
| Waddington sewage works overflow Waddington WwTW · UUP02003 | United Utilities | 2.2 | 1 | 5% | 212 | 166 | 145 | 1,935 | 100% |
| Penny Bridge storm overflow Penny Bridge CSO · UUP01532 | United Utilities | 39.0 | 22 | 4% | 57 | 37 | 31 | 37 | 100% |
| Bridge End storm overflow Bridge End CSO · UUP00311 | United Utilities | 40.0 | 22 | 4% | 6 | 3 | 0 | 0 | 100% |
| Chatburn (Ribble Lane) pumping station overflow Chatburn (Ribble Lane) PS · UUP00454 | United Utilities | 6.8 | 4 | 2% | 105 | 75 | 66 | 685 | 82% |
| Holden sewage works overflow Holden WwTW · UUP02265 | United Utilities | 13.0 | 7 | 2% | 6 | 2 | 0 | 0 | 90% |
| Horton-in-Ribblesdale sewage works overflow Horton-IN-Ribblesdale WwTW · UUP00990 | United Utilities | 50.0 | 28 | 2% | 144 | 89 | 35 | 433 | 100% |
| Spring Gardens(Waddington) storm overflow Spring Gardens(Waddington) CSO · UUP01804 | United Utilities | 4.2 | 2 | 2% | 85 | 69 | 48 | 90 | 100% |
| Rear OF No4 Ribble Avenue storm overflow Rear OF No4 Ribble Avenue CSO · UUP01637 | United Utilities | 6.0 | 3 | 2% | 43 | 47 | 30 | 29 | 100% |
| West Bradford WwNPS UUP02075 | United Utilities | 4.1 | 2 | 2% | 73 | 55 | 28 | 170 | 100% |
| Barnoldswick sewage works overflow Barnoldswick WwTW · UUP00190 | United Utilities | 25.4 | 14 | 1% | 40 | 29 | 23 | 134 | 100% |
| Long Preston (Lngpr) sewage works overflow Long Preston Wastewater Treatment Works (Lngpr) (017160041) · UUP01175 | United Utilities | 30.3 | 17 | 1% | 115 | 119 | 54 | 506 | 100% |
| Grindleton sewage works overflow Grindleton WwTW · UUP00867 | United Utilities | 5.5 | 3 | 1% | 143 | 125 | 20 | 166 | 100% |
| Cornmill Cottages storm overflow Cornmill Cottages CSO · UUP00543 | United Utilities | 26.5 | 15 | 1% | 1 | 2 | 0 | 0 | 100% |
| Dam Head Bridge storm overflow Dam Head Bridge CSO · UUP00602 | United Utilities | 26.7 | 15 | 1% | 13 | 8 | 10 | 4 | 100% |
| Near Butts Beck Footpath storm overflow Near Butts Beck Footpath CSO · UUP01369 | United Utilities | 26.9 | 15 | 1% | 10 | 15 | 5 | 2 | 100% |
| Calf Hall Road storm overflow Calf Hall Road CSO · UUP00394 | United Utilities | 27.3 | 15 | 1% | 1 | 5 | 7 | 2 | 100% |
| Hellifield sewage works overflow Hellifield WwTW · UUP00936 | United Utilities | 26.5 | 15 | 0% | 0 | 172 | 120 | 547 | 100% |
| Hellifield sewage works overflow Hellifield WwTW · UUP00935 | United Utilities | 26.5 | 15 | 0% | 165 | 135 | 103 | 492 | 100% |
| Marton Hall Farm pumping station overflow Marton Hall Farm/SPS · YWS01333 | Yorkshire Water | 26.6 | 15 | 0% | 52 | 31 | 26 | 132 | 100% |
A dash: no annual return for that overflow in that year.
Sources and credits
Storm overflow annual returns: © Environment Agency copyright and/or database right 2025, Open Government Licence v3.0. Overflow positions: the water companies via the National Storm Overflow Hub, CC BY 4.0. River network: contains OS data © Crown copyright and database right 2026 (OS Open Rivers). Traced and weighted by SwimSignal (swimsignal.co.uk), whose method is at swimsignal.co.uk/methods.html. All credits and licences.