Overflow history upstream of River Dart, Dartington Pontoon
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 | 12 | 637 | 5,035 | 1,338 |
| 2022 | 19 | 827 | 7,548 | 1,189 |
| 2023 | 19 | 1,649 | 21,256 | 2,675 |
| 2024 | 20 | 1,529 | 17,381 | 2,630 |
| 2025 | 20 | 1,201 | 12,104 | 1,712 |
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 20, 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 |
|---|---|---|---|---|---|---|---|---|---|
| Staverton sewage works storm tank overflow Staverton STW_SSO_Staverton · SBB01166 | South West Water | 3.4 | 2 | 81% | 21 | 34 | 24 | 295 | 96% |
| Kilbury, Buckfastleigh sewage works storm tank overflow Kilbury STW_SSO_Buckfastleigh · SBB00178 | South West Water | 10.2 | 6 | 58% | 143 | 138 | 90 | 1,406 | 100% |
| Kilbury, Buckfastleigh sewage works overflow Kilbury STW_SO_Buckfastleigh · SBB00179 | South West Water | 10.2 | 6 | 58% | 137 | 126 | 93 | 803 | 100% |
| Old Woollen Mill, Buckfastleigh storm overflow OLD Woollen Mill_CSO_Buckfastleigh · SBB00885 | South West Water | 11.9 | 7 | 44% | 14 | 11 | 17 | 42 | 99% |
| Dartington C storm overflow Dartington C_CSO_Dartington · SBB00350 | South West Water | 1.2 | under 1 | 4% | 83 | 39 | 33 | 271 | 99% |
| Textile Mill, Dartington storm overflow Textile Mill_CSO_Dartington · SBB01219 | South West Water | 1.3 | under 1 | 4% | 59 | 77 | 52 | 252 | 97% |
| Dartington Sch Two storm overflow Dartington SCH TWO_CSO_Dartington · SBB00349 | South West Water | 1.8 | 1 | 4% | 98 | 84 | 45 | 508 | 100% |
| Shinners Bridge, Dartington storm overflow Shinners Bridge_CSO_Dartington · SBB01082 | South West Water | 1.7 | under 1 | 4% | 62 | 37 | 18 | 26 | 89% |
| Pear Tree Cross, Ashburton storm overflow Pear Tree Cross_CSO_Ashburton · SBB00917 | South West Water | 14.1 | 8 | 3% | 64 | 64 | 57 | 281 | 100% |
| St Lukes Church, Buckfastleigh storm overflow ST Lukes Church_CSO_Buckfastleigh · SBB01145 | South West Water | 11.6 | 6 | 3% | 31 | 26 | 23 | 8 | 100% |
| Stonepark Crescent, Ashburton storm overflow Stonepark Crescent_CSO_Ashburton · SBB01186 | South West Water | 14.4 | 8 | 3% | 67 | 63 | 39 | 175 | 100% |
| Opp 26 Market Street, Buckfastleigh storm overflow OPP 26 Market Street_CSO_Buckfastleigh · SBB01408 | South West Water | 11.9 | 7 | 3% | – | 18 | 32 | 51 | 100% |
| Princetown sewage works overflow Princetown STW_SO_Princetown · SBB00985 | South West Water | 40.2 | 22 | 2% | 253 | 149 | 101 | 1,150 | 100% |
| Princetown sewage works storm tank overflow Princetown STW_SSO_Princetown · SBB00986 | South West Water | 40.2 | 22 | 2% | 0 | 102 | 75 | 1,135 | 95% |
| Rattery sewage works overflow Rattery STW_SO_Rattery · SBB01016 | South West Water | 7.6 | 4 | 2% | 149 | 114 | 107 | 1,713 | 100% |
| Blackbrook North, Princetown storm overflow Blackbrook North_CSO_Princetown · SBB00119 | South West Water | 42.2 | 24 | 2% | 180 | 170 | 117 | 723 | 94% |
| Holne sewage works overflow Holne STW_SO_Holne · SBB00581 | South West Water | 16.1 | 9 | 2% | 131 | 144 | 117 | 1,405 | 100% |
| Scorriton sewage works overflow Scorriton STW_SO_Scorriton · SBB01058 | South West Water | 16.2 | 9 | 1% | 132 | 132 | 141 | 1,837 | 100% |
| Widecombe, Widecombe in the Moor sewage works overflow Widecombe STW_SO_Widecombe IN THE Moor · SBB01359 | South West Water | 25.7 | 14 | 1% | 12 | 1 | 14 | 21 | 89% |
| New Park Garden, Widecombe storm overflow NEW Park Garden_CSO_Widecombe · SBB00830 | South West Water | 25.7 | 14 | 1% | 13 | 0 | 6 | 3 | 91% |
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.