Youldon Brook at GR8 Derworthy
EA name: SSN0292 YOULDON BROOK AT GR8 DERWORTHY (also listed as “SSN0292 YOULDON BROOK AT GREAT DERWORTHY”)
Environment Agency sampling point SW-SSN0292 · Freshwater - rivers · listed as open (“open” does not mean it is sampled now)
These are samples taken on a date, not live readings of the river. Results reach the Environment Agency's archive days to months after the sample is taken, so the newest here may be weeks or months old. FloodRadar does not grade them.
Where and when
- Last sampled
- 10 Sep 2026, 11:3621 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 21 since 30 Jan 2025 Imported periods: 1 Oct 2023 – 30 Sep 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Monitoring (national agency policy)
- Where
- National Grid 236673, 112209As published, to the nearest 1 m. Open in a map
- River, by its own name
- Youldon Brook
- River, by the map
- Not placedNo mapped watercourse within 500 m. The river map cannot say which watercourse this is.
- Next gauge downstream
- Not known
- Why it was sampled
- Monitoring (national agency policy) (21 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
95.7%
Sampled 10 Sep 2026, 21 days ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Sep 2026, 11:36 | 95.7 | 95.7% |
| 19 Aug 2026, 12:35 | 83.8 | 83.8% |
| 7 Jul 2026, 11:59 | 99.9 | 99.9% |
| 3 Jun 2026, 09:30 | 94.7 | 94.7% |
| 8 May 2026, 12:06 | 100.5 | 100.5% |
| 23 Apr 2026, 12:58 | 101.4 | 101.4% |
| 9 Mar 2026, 12:08 | 99.7 | 99.7% |
| 11 Feb 2026, 09:59 | 98.5 | 98.5% |
| 8 Jan 2026, 12:37 | 98 | 98% |
| 10 Dec 2025, 12:21 | 97.4 | 97.4% |
| 18 Nov 2025, 09:39 | 98.6 | 98.6% |
| 8 Oct 2025, 13:35 | 91 | 91% |
| 4 Sep 2025, 10:00 | 94.5 | 94.5% |
| 15 Aug 2025, 12:32 | 93.7 | 93.7% |
| 20 Jun 2025, 11:47 | 93.8 | 93.8% |
| 14 May 2025, 10:46 | 96.7 | 96.7% |
| 30 Apr 2025, 14:34 | 97.6 | 97.6% |
| 10 Mar 2025, 12:37 | 100.1 | 100.1% |
| 17 Feb 2025, 11:42 | 101.3 | 101.3% |
| 30 Jan 2025, 12:00 | 99 | 99% |
Dissolved oxygen
as O2 · code 9924 · mg/l
10 mg/l
Sampled 10 Sep 2026, 21 days ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Sep 2026, 11:36 | 10 | 10 mg/l |
| 19 Aug 2026, 12:35 | 8.18 | 8.18 mg/l |
| 7 Jul 2026, 11:59 | 9.88 | 9.88 mg/l |
| 3 Jun 2026, 09:30 | 10 | 10 mg/l |
| 8 May 2026, 12:06 | 11 | 11 mg/l |
| 23 Apr 2026, 12:58 | 11.1 | 11.1 mg/l |
| 9 Mar 2026, 12:08 | 11.2 | 11.2 mg/l |
| 11 Feb 2026, 09:59 | 11.3 | 11.3 mg/l |
| 8 Jan 2026, 12:37 | 12 | 12 mg/l |
| 10 Dec 2025, 12:21 | 10.7 | 10.7 mg/l |
| 18 Nov 2025, 09:39 | 11.3 | 11.3 mg/l |
| 8 Oct 2025, 13:35 | 9.61 | 9.61 mg/l |
| 4 Sep 2025, 10:00 | 9.95 | 9.95 mg/l |
| 15 Aug 2025, 12:32 | 9.22 | 9.22 mg/l |
| 20 Jun 2025, 11:47 | 9.33 | 9.33 mg/l |
| 14 May 2025, 10:46 | 10.5 | 10.5 mg/l |
| 30 Apr 2025, 14:34 | 9.84 | 9.84 mg/l |
| 10 Mar 2025, 12:37 | 11.3 | 11.3 mg/l |
| 17 Feb 2025, 11:42 | 12.7 | 12.7 mg/l |
| 30 Jan 2025, 12:00 | 12 | 12 mg/l |
Water temperature
code 0076 · °C
13.2 °C
Sampled 10 Sep 2026, 21 days ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Sep 2026, 11:36 | 13.2 | 13.2 °C |
| 19 Aug 2026, 12:35 | 16.4 | 16.4 °C |
| 7 Jul 2026, 11:59 | 15.8 | 15.8 °C |
| 3 Jun 2026, 09:30 | 12.7 | 12.7 °C |
| 8 May 2026, 12:06 | 11.4 | 11.4 °C |
| 23 Apr 2026, 12:58 | 11.2 | 11.2 °C |
| 9 Mar 2026, 12:08 | 10.1 | 10.1 °C |
| 11 Feb 2026, 09:59 | 9.2 | 9.2 °C |
| 8 Jan 2026, 12:37 | 6.6 | 6.6 °C |
| 10 Dec 2025, 12:21 | 10.9 | 10.9 °C |
| 18 Nov 2025, 09:39 | 9.1 | 9.1 °C |
| 8 Oct 2025, 13:35 | 12.8 | 12.8 °C |
| 4 Sep 2025, 10:00 | 12.9 | 12.9 °C |
| 15 Aug 2025, 12:32 | 16 | 16 °C |
| 20 Jun 2025, 11:47 | 15.5 | 15.5 °C |
| 14 May 2025, 10:46 | 11.4 | 11.4 °C |
| 30 Apr 2025, 14:34 | 14.9 | 14.9 °C |
| 10 Mar 2025, 12:37 | 9.9 | 9.9 °C |
| 17 Feb 2025, 11:42 | 5.6 | 5.6 °C |
| 30 Jan 2025, 12:00 | 7.1 | 7.1 °C |
pH
code 0061
7.54
Sampled 10 Sep 2026, 21 days ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Sep 2026, 11:36 | 7.54 | 7.54 |
| 19 Aug 2026, 12:35 | 7.24 | 7.24 |
| 7 Jul 2026, 11:59 | 7.88 | 7.88 |
| 3 Jun 2026, 09:30 | 7.27 | 7.27 |
| 8 May 2026, 12:06 | 7.45 | 7.45 |
| 23 Apr 2026, 12:58 | 7.46 | 7.46 |
| 9 Mar 2026, 12:08 | 7.41 | 7.41 |
| 11 Feb 2026, 09:59 | 7.19 | 7.19 |
| 8 Jan 2026, 12:37 | 7.28 | 7.28 |
| 10 Dec 2025, 12:21 | 7.07 | 7.07 |
| 18 Nov 2025, 09:39 | 7.39 | 7.39 |
| 8 Oct 2025, 13:35 | 7.18 | 7.18 |
| 4 Sep 2025, 10:00 | 8.08 | 8.08 |
| 15 Aug 2025, 12:32 | 7.4 | 7.4 |
| 20 Jun 2025, 11:47 | 7.44 | 7.44 |
| 14 May 2025, 10:46 | 7.56 | 7.56 |
| 30 Apr 2025, 14:34 | 7.53 | 7.53 |
| 10 Mar 2025, 12:37 | 7.33 | 7.33 |
| 17 Feb 2025, 11:42 | 7.47 | 7.47 |
| 30 Jan 2025, 12:00 | 7.36 | 7.36 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 10 Sep 2026, 21 days ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Sep 2026, 11:36 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 Aug 2026, 12:35 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 Jul 2026, 11:59 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Jun 2026, 09:30 | <0.03 | below 0.03 mg/l (not detected above this) |
| 8 May 2026, 12:06 | <0.03 | below 0.03 mg/l (not detected above this) |
| 23 Apr 2026, 12:58 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Mar 2026, 12:08 | 0.031 | 0.031 mg/l |
| 11 Feb 2026, 09:59 | <0.03 | below 0.03 mg/l (not detected above this) |
| 8 Jan 2026, 12:37 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Dec 2025, 12:21 | <0.03 | below 0.03 mg/l (not detected above this) |
| 18 Nov 2025, 09:39 | <0.03 | below 0.03 mg/l (not detected above this) |
| 8 Oct 2025, 13:35 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Sep 2025, 10:00 | <0.03 | below 0.03 mg/l (not detected above this) |
| 15 Aug 2025, 12:32 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 Jun 2025, 11:47 | <0.03 | below 0.03 mg/l (not detected above this) |
| 14 May 2025, 10:46 | <0.03 | below 0.03 mg/l (not detected above this) |
| 30 Apr 2025, 14:34 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Mar 2025, 12:37 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Feb 2025, 11:42 | <0.03 | below 0.03 mg/l (not detected above this) |
| 30 Jan 2025, 12:00 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
1.8 mg/l
Sampled 10 Sep 2026, 21 days ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Sep 2026, 11:36 | 1.8 | 1.8 mg/l |
| 19 Aug 2026, 12:35 | 1.3 | 1.3 mg/l |
| 7 Jul 2026, 11:59 | 2.1 | 2.1 mg/l |
| 3 Jun 2026, 09:30 | 5.78 | 5.78 mg/l |
| 8 May 2026, 12:06 | 1.69 | 1.69 mg/l |
| 23 Apr 2026, 12:58 | 1.7 | 1.7 mg/l |
| 9 Mar 2026, 12:08 | 2.2 | 2.2 mg/l |
| 11 Feb 2026, 09:59 | 1.9 | 1.9 mg/l |
| 8 Jan 2026, 12:37 | 1.6 | 1.6 mg/l |
| 10 Dec 2025, 12:21 | 2.6 | 2.6 mg/l |
| 18 Nov 2025, 09:39 | 2.7 | 2.7 mg/l |
| 8 Oct 2025, 13:35 | 2.2 | 2.2 mg/l |
| 4 Sep 2025, 10:00 | 1.1 | 1.1 mg/l |
| 15 Aug 2025, 12:32 | 1.2 | 1.2 mg/l |
| 20 Jun 2025, 11:47 | 2.7 | 2.7 mg/l |
| 14 May 2025, 10:46 | 2.1 | 2.1 mg/l |
| 30 Apr 2025, 14:34 | 2.2 | 2.2 mg/l |
| 10 Mar 2025, 12:37 | 2.4 | 2.4 mg/l |
| 17 Feb 2025, 11:42 | 2.2 | 2.2 mg/l |
| 30 Jan 2025, 12:00 | 2.7 | 2.7 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.031 mg/l
Sampled 10 Sep 2026, 21 days ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Sep 2026, 11:36 | 0.031 | 0.031 mg/l |
| 19 Aug 2026, 12:35 | 0.037 | 0.037 mg/l |
| 7 Jul 2026, 11:59 | 0.015 | 0.015 mg/l |
| 3 Jun 2026, 09:30 | <0.01 | below 0.01 mg/l (not detected above this) |
| 8 May 2026, 12:06 | 0.015 | 0.015 mg/l |
| 23 Apr 2026, 12:58 | <0.01 | below 0.01 mg/l (not detected above this) |
| 9 Mar 2026, 12:08 | 0.015 | 0.015 mg/l |
| 11 Feb 2026, 09:59 | 0.017 | 0.017 mg/l |
| 8 Jan 2026, 12:37 | 0.015 | 0.015 mg/l |
| 10 Dec 2025, 12:21 | 0.011 | 0.011 mg/l |
| 18 Nov 2025, 09:39 | <0.01 | below 0.01 mg/l (not detected above this) |
| 8 Oct 2025, 13:35 | <0.01 | below 0.01 mg/l (not detected above this) |
| 4 Sep 2025, 10:00 | 0.026 | 0.026 mg/l |
| 15 Aug 2025, 12:32 | 0.032 | 0.032 mg/l |
| 20 Jun 2025, 11:47 | 0.02 | 0.02 mg/l |
| 14 May 2025, 10:46 | 0.01 | 0.01 mg/l |
| 30 Apr 2025, 14:34 | <0.01 | below 0.01 mg/l (not detected above this) |
| 10 Mar 2025, 12:37 | <0.01 | below 0.01 mg/l (not detected above this) |
| 17 Feb 2025, 11:42 | <0.01 | below 0.01 mg/l (not detected above this) |
| 30 Jan 2025, 12:00 | <0.01 | below 0.01 mg/l (not detected above this) |
Conductivity
at 25 °C · code 0077 · µS/cm
147 µS/cm
Sampled 10 Sep 2026, 21 days ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Sep 2026, 11:36 | 147 | 147 µS/cm |
| 19 Aug 2026, 12:35 | 145 | 145 µS/cm |
| 7 Jul 2026, 11:59 | 146 | 146 µS/cm |
| 3 Jun 2026, 09:30 | 184 | 184 µS/cm |
| 8 May 2026, 12:06 | 128 | 128 µS/cm |
| 23 Apr 2026, 12:58 | 117 | 117 µS/cm |
| 9 Mar 2026, 12:08 | 121 | 121 µS/cm |
| 11 Feb 2026, 09:59 | 120 | 120 µS/cm |
| 8 Jan 2026, 12:37 | 118 | 118 µS/cm |
| 10 Dec 2025, 12:21 | 123 | 123 µS/cm |
| 18 Nov 2025, 09:39 | 129 | 129 µS/cm |
| 8 Oct 2025, 13:35 | 138 | 138 µS/cm |
| 4 Sep 2025, 10:00 | 180 | 180 µS/cm |
| 15 Aug 2025, 12:32 | 139 | 139 µS/cm |
| 20 Jun 2025, 11:47 | 139 | 139 µS/cm |
| 14 May 2025, 10:46 | 132 | 132 µS/cm |
| 30 Apr 2025, 14:34 | 130 | 130 µS/cm |
| 10 Mar 2025, 12:37 | 127 | 127 µS/cm |
| 17 Feb 2025, 11:42 | 124 | 124 µS/cm |
| 30 Jan 2025, 12:00 | 131 | 131 µS/cm |
Everything measured here
97 determinands, each kept by its code, unit and sample material: results in different units or on different materials are never mixed. A “below” result is under the laboratory's detection limit, not zero.
Show all 97 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 20 | Jan 2025 – Sep 2026 | 95.7% 10 Sep 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 20 | Jan 2025 – Sep 2026 | 10 mg/l 10 Sep 2026 |
| Temperature of Water 0076 | River water | 20 | Jan 2025 – Sep 2026 | 13.2 °C 10 Sep 2026 |
| pH 0061 | River water | 20 | Jan 2025 – Sep 2026 | 7.54 10 Sep 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 20 | Jan 2025 – Sep 2026 | below 0.03 mg/l 10 Sep 2026 |
| Nitrate as N 0117 | River water | 20 | Jan 2025 – Sep 2026 | 1.8 mg/l 10 Sep 2026 |
| Orthophosphate, reactive as P 0180 | River water | 20 | Jan 2025 – Sep 2026 | 0.031 mg/l 10 Sep 2026 |
| Conductivity at 25 C 0077 | River water | 20 | Jan 2025 – Sep 2026 | 147 µS/cm 10 Sep 2026 |
| 11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (F-53B Minor) 2993 | River water | 1 | Sep 2025 – Sep 2025 | below 0.001 µg/l 4 Sep 2025 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (B) 2942 | River water | 1 | Sep 2025 – Sep 2025 | below 0.001 µg/l 4 Sep 2025 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (L) 2991 | River water | 1 | Sep 2025 – Sep 2025 | below 0.001 µg/l 4 Sep 2025 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (B) 2943 | River water | 1 | Sep 2025 – Sep 2025 | below 0.0005 µg/l 4 Sep 2025 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (L) 2990 | River water | 1 | Sep 2025 – Sep 2025 | below 0.0005 µg/l 4 Sep 2025 |
| 2H,2H,3H,3H-Perfluorooctanoic acid 2989 | River water | 1 | Sep 2025 – Sep 2025 | below 0.001 µg/l 4 Sep 2025 |
| 3-Perfluoroheptylpropanoic acid 2925 | River water | 1 | Sep 2025 – Sep 2025 | below 0.0005 µg/l 4 Sep 2025 |
| 3:3 Fluorotelomer carboxylic acid 2926 | River water | 1 | Sep 2025 – Sep 2025 | below 0.004 µg/l 4 Sep 2025 |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) 2988 | River water | 1 | Sep 2025 – Sep 2025 | below 0.001 µg/l 4 Sep 2025 |
| 4:2 Fluorotelomer sulfonic acid 2987 | River water | 1 | Sep 2025 – Sep 2025 | below 0.0005 µg/l 4 Sep 2025 |
| 6:2 Fluorotelomer sulfonic acid 2984 | River water | 1 | Sep 2025 – Sep 2025 | below 0.001 µg/l 4 Sep 2025 |
| 8:2 Fluorotelomer sulfonic acid 2983 | River water | 1 | Sep 2025 – Sep 2025 | below 0.001 µg/l 4 Sep 2025 |
| 9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid 2982 | River water | 1 | Sep 2025 – Sep 2025 | below 0.0005 µg/l 4 Sep 2025 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 20 | Jan 2025 – Sep 2026 | 27 mg/l 10 Sep 2026 |
| Aluminium, Dissolved 6037 | River water | 3 | Apr 2025 – Jan 2026 | 49 µg/l 8 Jan 2026 |
| Aminomethylphosphonic acid 7125 | River water | 11 | Apr 2025 – Mar 2026 | below 0.1 µg/l 9 Mar 2026 |
| Ammonia un-ionised as N 0119 | River water | 20 | Jan 2025 – Sep 2026 | below 0.00024 mg/l 10 Sep 2026 |
| Barium, Dissolved 9446 | River water | 3 | Apr 2025 – Jan 2026 | below 10 µg/l 8 Jan 2026 |
| Boron, Dissolved 9447 | River water | 3 | Apr 2025 – Jan 2026 | below 100 µg/l 8 Jan 2026 |
| Cadmium, Dissolved 0106 | River water | 3 | Apr 2025 – Jan 2026 | 0.019 µg/l 8 Jan 2026 |
| Calcium, Dissolved 0239 | River water | 3 | Apr 2025 – Jan 2026 | 6.6 mg/l 8 Jan 2026 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 19 | Jan 2025 – Sep 2026 | 1.9 mg/l 10 Sep 2026 |
| Chloride 0172 | River water | 20 | Jan 2025 – Sep 2026 | 17 mg/l 10 Sep 2026 |
| Chromium, Dissolved 3409 | River water | 3 | Apr 2025 – Jan 2026 | below 0.5 µg/l 8 Jan 2026 |
| Copper : BLM Bioavailable 4821 | River water | 2 | Apr 2025 – Jan 2026 | 0.05 µg/l 8 Jan 2026 |
| Copper, Dissolved 6450 | River water | 3 | Apr 2025 – Jan 2026 | 0.66 µg/l 8 Jan 2026 |
| eDNA Report 3047 | River water | 1 | Jan 2025 – Jan 2025 | 1 text result 30 Jan 2025 |
| Flow Type 2896 | River water | 19 | Jan 2025 – Sep 2026 | Low Flow 10 Sep 2026 |
| Glyphosate 3007 | River water | 11 | Apr 2025 – Mar 2026 | below 0.1 µg/l 9 Mar 2026 |
| Hardness, Calcium 0163 | River water | 3 | Apr 2025 – Jan 2026 | 16.5 mg/l 8 Jan 2026 |
| Hardness, Total as CaCO3 0158 | River water | 3 | Apr 2025 – Jan 2026 | 29.7 mg/l 8 Jan 2026 |
| Hexafluoropropylene oxide dimer acid (Gen X) 2981 | River water | 1 | Sep 2025 – Sep 2025 | below 0.001 µg/l 4 Sep 2025 |
| Iron, Dissolved 6460 | River water | 3 | Apr 2025 – Jan 2026 | 170 µg/l 8 Jan 2026 |
| LCMS Screen : Semi Quantitative 7299 | River water | 3 | Jan 2026 – Jul 2026 | 1 text result 7 Jul 2026 |
| Lead : BLM Bioavailable 3377 | River water | 2 | Apr 2025 – Jan 2026 | 0.05 µg/l 8 Jan 2026 |
| Lead, Dissolved 0052 | River water | 3 | Apr 2025 – Jan 2026 | 0.16 µg/l 8 Jan 2026 |
| Lithium, Dissolved 4201 | River water | 3 | Apr 2025 – Jan 2026 | below 100 µg/l 8 Jan 2026 |
| Magnesium, Dissolved 0235 | River water | 3 | Apr 2025 – Jan 2026 | 3.2 mg/l 8 Jan 2026 |
| Manganese : BLM Bioavailable 4820 | River water | 2 | Apr 2025 – Jan 2026 | 10 µg/l 8 Jan 2026 |
| Manganese, Dissolved 6458 | River water | 3 | Apr 2025 – Jan 2026 | 34 µg/l 8 Jan 2026 |
| Mitochondrial marker : Fish 12S 2857 | River water | 1 | Jan 2025 – Jan 2025 | Not found 30 Jan 2025 |
| N-Ethylperfluorooctanesulfonamide 2977 | River water | 1 | Sep 2025 – Sep 2025 | below 0.002 µg/l 4 Sep 2025 |
| N-methylperfluorooctanesulfonamide 2975 | River water | 1 | Sep 2025 – Sep 2025 | below 0.002 µg/l 4 Sep 2025 |
| Nickel : BLM Bioavailable 3878 | River water | 2 | Apr 2025 – Jan 2026 | 0.55 µg/l 8 Jan 2026 |
| Nickel, Dissolved 3410 | River water | 3 | Apr 2025 – Jan 2026 | 1.4 µg/l 8 Jan 2026 |
| Nitrite as N 0118 | River water | 20 | Jan 2025 – Sep 2026 | below 0.004 mg/l 10 Sep 2026 |
| Nitrogen, Total as N 9686 | River water | 20 | Jan 2025 – Sep 2026 | 2.2 mg/l 10 Sep 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 20 | Jan 2025 – Sep 2026 | 1.8 mg/l 10 Sep 2026 |
| Perfluoro(2-ethoxyethane)sulfonic acid 2924 | River water | 1 | Sep 2025 – Sep 2025 | below 0.0005 µg/l 4 Sep 2025 |
| Perfluoro(4-methoxybutanoic) acid 2923 | River water | 1 | Sep 2025 – Sep 2025 | below 0.0005 µg/l 4 Sep 2025 |
| Perfluoro-3,6-dioxaheptanoic acid 2922 | River water | 1 | Sep 2025 – Sep 2025 | below 0.0005 µg/l 4 Sep 2025 |
| Perfluoro-3-methoxypropanoic acid 2921 | River water | 1 | Sep 2025 – Sep 2025 | below 0.0005 µg/l 4 Sep 2025 |
| Perfluoro-4-ethylcyclohexanesulfonic acid 2973 | River water | 1 | Sep 2025 – Sep 2025 | below 0.0005 µg/l 4 Sep 2025 |
| Perfluorobutanesulfonic acid 2972 | River water | 1 | Sep 2025 – Sep 2025 | below 0.001 µg/l 4 Sep 2025 |
| Perfluorobutanoic acid 2995 | River water | 1 | Sep 2025 – Sep 2025 | below 0.001 µg/l 4 Sep 2025 |
| Perfluorobutylsulfonamide (perfluorobutane sulfonamide) 2970 | River water | 1 | Sep 2025 – Sep 2025 | below 0.0005 µg/l 4 Sep 2025 |
| Perfluorodecanesulfonic acid 2969 | River water | 1 | Sep 2025 – Sep 2025 | below 0.001 µg/l 4 Sep 2025 |
| Perfluorodecanoic acid 8892 | River water | 1 | Sep 2025 – Sep 2025 | below 0.001 µg/l 4 Sep 2025 |
| Perfluorododecane sulfonic acid 2968 | River water | 1 | Sep 2025 – Sep 2025 | below 0.005 µg/l 4 Sep 2025 |
| Perfluorododecanoic acid 8894 | River water | 1 | Sep 2025 – Sep 2025 | below 0.002 µg/l 4 Sep 2025 |
| Perfluoroheptanesulfonic acid 2967 | River water | 1 | Sep 2025 – Sep 2025 | below 0.0005 µg/l 4 Sep 2025 |
| Perfluoroheptanoic acid 8889 | River water | 1 | Sep 2025 – Sep 2025 | below 0.001 µg/l 4 Sep 2025 |
| Perfluorohexanesulfonamide 2965 | River water | 1 | Sep 2025 – Sep 2025 | below 0.0005 µg/l 4 Sep 2025 |
| Perfluorohexanesulfonic acid (B) 2944 | River water | 1 | Sep 2025 – Sep 2025 | below 0.0005 µg/l 4 Sep 2025 |
| Perfluorohexanesulfonic acid (L) 2964 | River water | 1 | Sep 2025 – Sep 2025 | below 0.0005 µg/l 4 Sep 2025 |
| Perfluorohexanoic acid 8888 | River water | 1 | Sep 2025 – Sep 2025 | below 0.0005 µg/l 4 Sep 2025 |
| Perfluorononanesulfonic acid 2963 | River water | 1 | Sep 2025 – Sep 2025 | below 0.0005 µg/l 4 Sep 2025 |
| Perfluorononanoic acid 8891 | River water | 1 | Sep 2025 – Sep 2025 | below 0.001 µg/l 4 Sep 2025 |
| Perfluorooctadecanoic acid 2962 | River water | 1 | Sep 2025 – Sep 2025 | below 0.002 µg/l 4 Sep 2025 |
| Perfluorooctanesulfonamide 2961 | River water | 1 | Sep 2025 – Sep 2025 | below 0.001 µg/l 4 Sep 2025 |
| Perfluorooctanesulfonic acid (branched) 2960 | River water | 1 | Sep 2025 – Sep 2025 | below 0.0005 µg/l 4 Sep 2025 |
| Perfluorooctanesulfonic acid (linear) 2959 | River water | 1 | Sep 2025 – Sep 2025 | below 0.0005 µg/l 4 Sep 2025 |
| Perfluorooctanoic acid 8890 | River water | 1 | Sep 2025 – Sep 2025 | below 0.0005 µg/l 4 Sep 2025 |
| Perfluoropentanesulfonic acid 2957 | River water | 1 | Sep 2025 – Sep 2025 | below 0.0005 µg/l 4 Sep 2025 |
| Perfluoropentanoic acid 8887 | River water | 1 | Sep 2025 – Sep 2025 | below 0.001 µg/l 4 Sep 2025 |
| Perfluorotetradecanoic acid 8895 | River water | 1 | Sep 2025 – Sep 2025 | below 0.006 µg/l 4 Sep 2025 |
| Perfluorotridecanoic acid 2955 | River water | 1 | Sep 2025 – Sep 2025 | below 0.002 µg/l 4 Sep 2025 |
| Perfluoroundecane sulfonic acid 2953 | River water | 1 | Sep 2025 – Sep 2025 | below 0.004 µg/l 4 Sep 2025 |
| Perfluoroundecanoic acid 8893 | River water | 1 | Sep 2025 – Sep 2025 | below 0.001 µg/l 4 Sep 2025 |
| Phosphorus, Total as P 0348 | River water | 20 | Jan 2025 – Sep 2026 | 0.028 mg/l 10 Sep 2026 |
| Potassium, Dissolved 0209 | River water | 3 | Apr 2025 – Jan 2026 | 1 mg/l 8 Jan 2026 |
| Silica, reactive as SiO2 0182 | River water | 20 | Jan 2025 – Sep 2026 | 13 mg/l 10 Sep 2026 |
| Sodium, Dissolved 0205 | River water | 3 | Apr 2025 – Jan 2026 | 11 mg/l 8 Jan 2026 |
| Solids, Suspended at 105 C 0135 | River water | 20 | Jan 2025 – Sep 2026 | 4.8 mg/l 10 Sep 2026 |
| Strontium, Filtered 6693 | River water | 3 | Apr 2025 – Jan 2026 | 26 µg/l 8 Jan 2026 |
| Sulphate, Dissolved as SO4 7859 | River water | 3 | Apr 2025 – Jan 2026 | below 10 mg/l 8 Jan 2026 |
| Trifluoroacetic acid 2872 | River water | 1 | Mar 2026 – Mar 2026 | 0.54 µg/l 9 Mar 2026 |
| Zinc : BLM Bioavailable 4822 | River water | 2 | Apr 2025 – Jan 2026 | 0.86 µg/l 8 Jan 2026 |
| Zinc, Dissolved 3408 | River water | 3 | Apr 2025 – Jan 2026 | 1.4 µg/l 8 Jan 2026 |
FloodRadar does not grade these results: there is no overall score, and official river classifications are a separate dataset. A sample taken downstream of an overflow does not by itself show where anything in it came from. River connections and distances are traced on OS Open Rivers (edition 2026-04), which leaves out many small channels.
Water samples: Environment Agency Water Quality Archive, © Environment Agency and/or database right 2026, Open Government Licence v3.0.
Contains OS data © Crown copyright and database rights 2026.