| West Ford Brook at East Ford | unnamed stream | 18 km | 10 Aug 2026 · 59 days ago | Oxygen 47%Temp 14.6 °CpH 7.06Ammonia below 0.03 mg/l |
| Lilly Brook upstream of Tedburn St Mary sewage treatment works | Lilly Brook | 17 km | Last sampled 9 May 2014, before the imported period | |
| Lilly Brook downstream of Tedburn St Mary sewage treatment works | Lilly Brook | 17 km | Last sampled 2 Apr 2013, before the imported period | |
| Lilly Brook 100 m downstream of Tedburn St Mary sewage treatment works | Lilly Brook | 16 km | Last sampled 9 May 2014, before the imported period | |
| Ford Brook at Ford Farm | Ford Brook | 15 km | 3 Sep 2026 · 35 days ago | Oxygen 40.6% Jul 2026Temp 16.7 °C Jul 2026pH 7.42 Jul 2026Ammonia below 0.03 mg/l Jul 2026 |
| River Yeo at Gunstone Mills | River Yeo | 13 km | 3 Sep 2026 · 35 days ago | Oxygen 85.2%Temp 17.2 °CpH 7.78Ammonia 0.035 mg/l |
| Pitt Stream at Moorlake Bridge | unnamed stream | 12 km | Last sampled 22 Nov 2018, before the imported period | |
| Sandford Stream upstream of Sandford sewage treatment works | unnamed stream | 11 km | Last sampled 22 Feb 2001, before the imported period | |
| Sandford Stream downstream of Sandford sewage treatment works | unnamed stream | 11 km | Last sampled 22 Feb 2001, before the imported period | |
| River Culvery at Uton | River Culvery | 9.7 km | 3 Sep 2026 · 35 days ago | Oxygen 57.7%Temp 17.1 °CpH 7.55Ammonia below 0.03 mg/l |
| River Creedy at Creedy Bridge | River Creedy | 8.9 km | 4 Apr 2024 · 2.5 years ago | Oxygen 97.5%Temp 10.3 °CpH 7.7Ammonia 0.069 mg/l |
| River Creedy at Westacott Cottages | River Creedy | 7.0 km | 8 Sep 2026 · 30 days ago | Oxygen 78.9%Temp 16.4 °CpH 8.2Ammonia below 0.03 mg/l |
| River Yeo at Downes Mills | River Yeo | 6.6 km | 8 Sep 2026 · 30 days ago | Oxygen 88%Temp 16.1 °CpH 8.15Ammonia below 0.03 mg/l |
| River Yeo upstream of Lords Meadow sewage treatment works | River Yeo | 6.5 km | Last sampled 5 Nov 2018, before the imported period | |
| River Yeo downstream of Lords Meadow sewage treatment works | River Yeo | 6.4 km | Last sampled 15 Dec 2006, before the imported period | |
| Shobrooke Lake at Creedy Barton | Shobrooke Lake | 5.8 km | 3 Sep 2026 · 35 days ago | Oxygen 84.4%Temp 16.9 °CpH 7.88Ammonia below 0.03 mg/l |
| Tributary of Jackmoor Brook at Shute | unnamed stream | 5.0 km | 11 Dec 2024 · 22 months ago | Oxygen 97%Temp 7.3 °CpH 7.8Ammonia 0.038 mg/l |
| Jackmoor Brook upstream of Shobrooke sewage treatment works | unnamed stream | 4.7 km | Last sampled 19 Nov 2004, before the imported period | |
| Jackmoor Brook downstream of Shobrooke sewage treatment works | unnamed stream | 4.6 km | Last sampled 19 Nov 2004, before the imported period | |
| Shuttern Brook at Newton St Cyres | Shuttern Brook | 3.3 km | 6 Aug 2026 · 2 months ago | Oxygen 70.1%Temp 14.3 °CpH 7.66Ammonia below 0.03 mg/l |
| River Creedy at Newton St Cyres | River Creedy | 3.1 km | Last sampled 30 Sep 2013, before the imported period | |
| Shuttern Brook Prior to River Creedy | Shuttern Brook | 2.9 km | Last sampled 30 Sep 2013, before the imported period | |
| Jackmoor Brook at Langford | Jackmoor Brook | 1.2 km | 2 Sep 2026 · 36 days ago | Oxygen 86.8%Temp 15 °CpH 7.97Ammonia below 0.03 mg/l |