| River Lew at Hazel Grove | River Lew | 19 km | 15 Dec 2025 · 10 months ago | Oxygen 100.6%Temp 9.9 °CpH 7.13Ammonia 0.036 mg/l |
| River Lew upstream of Bridestowe sewage treatment works | River Lew | 18 km | 15 Dec 2025 · 10 months ago | Oxygen 99.8%Temp 9.9 °CpH 7.2Ammonia below 0.03 mg/l |
| River Lyd at A386 Roadbridge Lydford | River Lyd | 17 km | 18 Sep 2026 · 20 days ago | Oxygen 101%Temp 12.7 °CpH 6.94Ammonia below 0.03 mg/l |
| Motte and Baileys Brook upstream of Combebow | unnamed stream | 15 km | 24 Mar 2026 · 7 months ago | Oxygen 96.5%Temp 10.1 °CConductivity 148 µS/cm |
| River Lew at Combebow Bridge | River Lew | 15 km | 24 Mar 2026 · 7 months ago | Oxygen 96.7%Temp 10 °CConductivity 148 µS/cm |
| River Lyd at Glebe | River Lyd | 8.3 km | 11 Dec 2023 · 2.8 years ago | Oxygen 100.2%Temp 10.1 °CpH 7.17Ammonia below 0.03 mg/l |
| River Lyd at Greenlanes Bridge | River Lyd | 7.6 km | 23 Sep 2026 · 15 days ago | Oxygen 103.5%Temp 15.6 °CpH 7.49Ammonia below 0.03 mg/l |
| Quither Brook upstream of Chillaton sewage treatment works | unnamed stream | 7.4 km | Last sampled 25 Nov 2015, before the imported period | |
| River Lew upstream of River Lyd | River Lew | 7.3 km | Last sampled 27 Apr 2017, before the imported period | |
| River Lyd at Sydenham Bridge | River Lyd | 5.7 km | Last sampled 6 Mar 2002, before the imported period | |
| River Lyd upstream of Ambrosia Creamery Cooling | River Lyd | 1.7 km | Last sampled 8 Mar 2023, before the imported period | |
| River Thrushel at Tinhay Bridge | River Thrushel | 1.5 km | 15 Apr 2026 · 6 months ago | Oxygen 99.1%Temp 11.1 °CpH 7.41Ammonia 0.024 mg/l Feb 2024 |
| River Lyd at Southern Bridge | River Lyd | 1.4 km | Last sampled 8 Mar 2023, before the imported period | |
| River Lyd downstream of Ambrosia Creamery sewage treatment works | River Lyd | 1.3 km | Last sampled 24 Mar 2005, before the imported period | |
| River Thrushel downstream of Lifton (Joint) sewage treatment works | River Thrushel | 1.0 km | Last sampled 6 Mar 2002, before the imported period | |
| River Lyd at Lifton Bridge | River Lyd | 0.6 km | 18 May 2026 · 5 months ago | Oxygen 99.8%Temp 11.4 °CpH 7.61Ammonia below 0.03 mg/l |