Overflow history upstream of River Waveney, Outney Common, Bungay
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 | 13 | 301 | 3,899 | 986 |
| 2022 | 17 | 189 | 1,657 | 162 |
| 2023 | 24 | 450 | 4,795 | 566 |
| 2024 | 24 | 662 | 6,628 | 45 |
| 2025 | 24 | 165 | 1,271 | 10 |
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 24, 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 |
|---|---|---|---|---|---|---|---|---|---|
| Bungay-Earsham Street storm sewage overflow Bungay-Earsham Street SSO · AWS00373 | Anglian Water | 0.3 | under 1 | 98% | 1 | 2 | 4 | 1 | 98% |
| Bungay-Boyscott La pumping station overflow Bungay-Boyscott LA SP · AWS00173 | Anglian Water | 1.1 | under 1 | 95% | 36 | 0 | 0 | 0 | 100% |
| Eye-Kings Br Lowgate St pumping station overflow EYE-Kings BR Lowgate ST TPS · AWS00421 | Anglian Water | 34.9 | 19 | 3% | 0 | 0 | 0 | 0 | 100% |
| Harleston sewage works overflow Harleston STW · AWS00561 | Anglian Water | 14.2 | 8 | 3% | 18 | 12 | 12 | 13 | 100% |
| Harleston sewage works overflow Harleston STW · AWS00560 | Anglian Water | 14.2 | 8 | 3% | 8 | 5 | 5 | 24 | 99% |
| Occold pumping station overflow Occold-TPS · AWS00949 | Anglian Water | 37.3 | 21 | 3% | 2 | 0 | 13 | 32 | 100% |
| Pulham St Mary sewage works overflow Pulham ST Mary STW · AWS01015 | Anglian Water | 18.9 | 10 | 2% | 23 | 22 | 6 | 72 | 100% |
| Thorndon-Standwell Gn pumping station overflow Thorndon-Standwell GN TPS · AWS01370 | Anglian Water | 38.9 | 22 | 2% | 15 | 27 | 7 | 24 | 100% |
| Diss sewage works overflow Diss STW · AWS00339 | Anglian Water | 34.3 | 19 | 2% | 20 | 21 | 8 | 14 | 97% |
| Diss, Victoria Road storm overflow Diss, Victoria Road CSO · AWS01424 | Anglian Water | 34.4 | 19 | 2% | 9 | 75 | 0 | 0 | 97% |
| Uplands Way storm overflow Uplands Way CSO · AWS01556 | Anglian Water | 34.4 | 19 | 2% | 0 | 26 | 0 | 0 | 63% |
| Diss-Saracens Hd Mount St storm overflow Diss-Saracens HD Mount ST OV · AWS01095 | Anglian Water | 34.4 | 19 | 2% | 4 | 6 | 4 | 1 | 99% |
| Diss-Shelfanger Rd storm overflow Diss-Shelfanger RD OV · AWS01338 | Anglian Water | 34.4 | 19 | 2% | 0 | 56 | 0 | 0 | 99% |
| Diss, Victoria Road (Morrisons) storm overflow Diss - Victoria Road CSO (Morrisons) · AWS01423 | Anglian Water | 34.6 | 19 | 2% | 0 | 1 | 0 | 0 | 100% |
| Wickham Skeith pumping station overflow Wickham Skeith-TPS · AWS01499 | Anglian Water | 43.2 | 24 | 1% | 3 | 8 | 0 | 0 | 100% |
| Dickleburgh-Rectory Rd sewage works overflow Dickleburgh-Rectory RD STW · AWS00337 | Anglian Water | 40.6 | 23 | 0% | 84 | 69 | 47 | 564 | 100% |
| Stradbroke Old sewage works overflow Stradbroke OLD STW SP · AWS01322 | Anglian Water | 29.1 | 16 | 0% | 10 | 23 | 0 | 0 | 100% |
| Thorndon-Catbridge sewage works overflow Thorndon-Catbridge STW · AWS01369 | Anglian Water | 38.4 | 21 | <1% | 54 | 85 | 23 | 222 | 99% |
| Eye-Hoxne Rd sewage works overflow EYE-Hoxne RD STW · AWS00423 | Anglian Water | 33.1 | 18 | <1% | 30 | 39 | 5 | 7 | 100% |
| Horham pumping station overflow Horham Terminal Pumping Station · AWS00615 | Anglian Water | 37.8 | 21 | <1% | 22 | 18 | 0 | 0 | 99% |
| Roydon-Brewers Green (Diss) pumping station overflow Roydon-Brewers Green SP (Diss) · AWS00135 | Anglian Water | 40.6 | 23 | <1% | 16 | 31 | 1 | 1 | 100% |
| Mendlesham pumping station overflow Mendlesham-TPS · AWS00835 | Anglian Water | 45.3 | 25 | <1% | 36 | 32 | 15 | 78 | 100% |
| Bedfield-Crown La pumping station overflow Bedfield-Crown LA SP · AWS00070 | Anglian Water | 45.5 | 25 | <1% | 36 | 73 | 11 | 168 | 100% |
| Bacton sewage works overflow Bacton Water Recycling Centre · AWS00040 | Anglian Water | 49.2 | 27 | <1% | 23 | 31 | 4 | 50 | 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.