River Severn (Upper) Tewkesbury
EA name: R SEVERN (UPPER) TEWKESBURY (also listed as “RIVER SEVERN (UPPER) TEWKESBURY”)
Environment Agency sampling point MD-00026230 · 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
- 29 May 2026, 09:574 months ago · time as the Environment Agency records it (UK clock time; the source gives no time zone). Not sampled since, as far as the archive shows: the Environment Agency was asked up to 30 Sep 2026 and had nothing newer.
- Samples banked
- 24 since 4 Oct 2023 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 388870, 233720As published, to the nearest 10 m. Open in a map
- River, by its own name
- Severn
- River, by the map
- Afon HafrenPlaced on the river its name gives, 1 m from the line.
- Next gauge downstream
- Deerhurst Flood Plain Level On the River Severn · 4.6 km along the riverDeerhurst On the River Severn · 4.6 km along the riverBeside Mythe Bridge: too close to say above or below.
- Nearest gauge upstream
- Saxons Lode On the River Severn · 6.7 km along the river
- Why it was sampled
- Monitoring (national agency policy) (24 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
77%
Sampled 29 May 2026, 4 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 29 May 2026, 09:57 | 77 | 77% |
| 1 Apr 2026, 09:59 | 97.9 | 97.9% |
| 25 Feb 2026, 10:16 | 92.8 | 92.8% |
| 14 Jan 2026, 14:38 | 97.4 | 97.4% |
| 12 Dec 2025, 14:09 | 95.5 | 95.5% |
| 17 Nov 2025, 15:14 | 85.2 | 85.2% |
| 29 Oct 2025, 12:44 | 99.1 | 99.1% |
| 9 Sep 2025, 11:43 | 77.6 | 77.6% |
| 13 Aug 2025, 11:42 | 82.6 | 82.6% |
| 31 Jul 2025, 14:28 | 89.7 | 89.7% |
| 17 Jun 2025, 13:41 | 88.7 | 88.7% |
| 8 May 2025, 13:57 | 98.4 | 98.4% |
| 9 Apr 2025, 13:31 | 104.8 | 104.8% |
| 18 Mar 2025, 13:30 | 98 | 98% |
| 27 Jan 2025, 13:50 | 98 | 98% |
| 4 Dec 2024, 12:25 | 92 | 92% |
| 18 Nov 2024, 14:31 | 94.1 | 94.1% |
| 15 Oct 2024, 11:53 | 91.1 | 91.1% |
| 16 Sep 2024, 13:31 | 98.3 | 98.3% |
| 19 Aug 2024, 08:44 | 82.6 | 82.6% |
| 25 Jun 2024, 08:34 | 84.4 | 84.4% |
| 10 Apr 2024, 12:20 | 92.4 | 92.4% |
| 25 Jan 2024, 08:26 | 94.2 | 94.2% |
| 4 Oct 2023, 13:25 | 90.5 | 90.5% |
Dissolved oxygen
as O2 · code 9924 · mg/l
6.86 mg/l
Sampled 29 May 2026, 4 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 29 May 2026, 09:57 | 6.86 | 6.86 mg/l |
| 1 Apr 2026, 09:59 | 11 | 11 mg/l |
| 25 Feb 2026, 10:16 | 10.7 | 10.7 mg/l |
| 14 Jan 2026, 14:38 | 12.2 | 12.2 mg/l |
| 12 Dec 2025, 14:09 | 10.8 | 10.8 mg/l |
| 17 Nov 2025, 15:14 | 9.76 | 9.76 mg/l |
| 29 Oct 2025, 12:44 | 11.2 | 11.2 mg/l |
| 9 Sep 2025, 11:43 | 7.48 | 7.48 mg/l |
| 13 Aug 2025, 11:42 | 7.33 | 7.33 mg/l |
| 31 Jul 2025, 14:28 | 7.98 | 7.98 mg/l |
| 17 Jun 2025, 13:41 | 8.03 | 8.03 mg/l |
| 8 May 2025, 13:57 | 9.88 | 9.88 mg/l |
| 9 Apr 2025, 13:31 | 10.9 | 10.9 mg/l |
| 18 Mar 2025, 13:30 | 11.6 | 11.6 mg/l |
| 27 Jan 2025, 13:50 | 12.2 | 12.2 mg/l |
| 4 Dec 2024, 12:25 | 10.7 | 10.7 mg/l |
| 18 Nov 2024, 14:31 | 10.8 | 10.8 mg/l |
| 15 Oct 2024, 11:53 | 10.1 | 10.1 mg/l |
| 16 Sep 2024, 13:31 | 9.62 | 9.62 mg/l |
| 19 Aug 2024, 08:44 | 7.8 | 7.8 mg/l |
| 25 Jun 2024, 08:34 | 7.76 | 7.76 mg/l |
| 10 Apr 2024, 12:20 | 10.2 | 10.2 mg/l |
| 25 Jan 2024, 08:26 | 11.3 | 11.3 mg/l |
| 4 Oct 2023, 13:25 | 9.14 | 9.14 mg/l |
Water temperature
code 0076 · °C
20.9 °C
Sampled 29 May 2026, 4 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 29 May 2026, 09:57 | 20.9 | 20.9 °C |
| 1 Apr 2026, 09:59 | 10 | 10 °C |
| 25 Feb 2026, 10:16 | 9.2 | 9.2 °C |
| 14 Jan 2026, 14:38 | 5.6 | 5.6 °C |
| 12 Dec 2025, 14:09 | 9.7 | 9.7 °C |
| 17 Nov 2025, 15:14 | 9.3 | 9.3 °C |
| 29 Oct 2025, 12:44 | 10 | 10 °C |
| 9 Sep 2025, 11:43 | 17 | 17 °C |
| 13 Aug 2025, 11:42 | 21.1 | 21.1 °C |
| 31 Jul 2025, 14:28 | 21 | 21 °C |
| 17 Jun 2025, 13:41 | 20.1 | 20.1 °C |
| 8 May 2025, 13:57 | 15.1 | 15.1 °C |
| 9 Apr 2025, 13:31 | 13.4 | 13.4 °C |
| 18 Mar 2025, 13:30 | 8 | 8 °C |
| 27 Jan 2025, 13:50 | 5.8 | 5.8 °C |
| 4 Dec 2024, 12:25 | 8.5 | 8.5 °C |
| 18 Nov 2024, 14:31 | 9.1 | 9.1 °C |
| 15 Oct 2024, 11:53 | 10.7 | 10.7 °C |
| 16 Sep 2024, 13:31 | 16.3 | 16.3 °C |
| 19 Aug 2024, 08:44 | 18 | 18 °C |
| 25 Jun 2024, 08:34 | 19.3 | 19.3 °C |
| 10 Apr 2024, 12:20 | 10.7 | 10.7 °C |
| 25 Jan 2024, 08:26 | 7.3 | 7.3 °C |
| 4 Oct 2023, 13:25 | 14.8 | 14.8 °C |
pH
code 0061
7.61
Sampled 29 May 2026, 4 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 29 May 2026, 09:57 | 7.61 | 7.61 |
| 1 Apr 2026, 09:59 | 8.06 | 8.06 |
| 25 Feb 2026, 10:16 | 7.83 | 7.83 |
| 14 Jan 2026, 14:38 | 8.08 | 8.08 |
| 12 Dec 2025, 14:09 | 7.76 | 7.76 |
| 17 Nov 2025, 15:14 | 7.93 | 7.93 |
| 29 Oct 2025, 12:44 | 8.05 | 8.05 |
| 9 Sep 2025, 11:43 | 7.72 | 7.72 |
| 13 Aug 2025, 11:42 | 7.78 | 7.78 |
| 31 Jul 2025, 14:28 | 7.78 | 7.78 |
| 17 Jun 2025, 13:41 | 7.84 | 7.84 |
| 8 May 2025, 13:57 | 8.2 | 8.2 |
| 9 Apr 2025, 13:31 | 8.41 | 8.41 |
| 18 Mar 2025, 13:30 | 8.15 | 8.15 |
| 27 Jan 2025, 13:50 | 7.99 | 7.99 |
| 4 Dec 2024, 12:25 | 7.84 | 7.84 |
| 18 Nov 2024, 14:31 | 8.11 | 8.11 |
| 15 Oct 2024, 11:53 | 7.8 | 7.8 |
| 16 Sep 2024, 13:31 | 8 | 8 |
| 19 Aug 2024, 08:44 | 7.8 | 7.8 |
| 25 Jun 2024, 08:34 | 7.78 | 7.78 |
| 10 Apr 2024, 12:20 | 7.98 | 7.98 |
| 25 Jan 2024, 08:26 | 7.75 | 7.75 |
| 4 Oct 2023, 13:25 | 7.86 | 7.86 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.094 mg/l
Sampled 29 May 2026, 4 months ago · 21 results banked
Every result (21)
| Sampled | Result as published | Reads as |
|---|---|---|
| 29 May 2026, 09:57 | 0.094 | 0.094 mg/l |
| 1 Apr 2026, 09:59 | <0.03 | below 0.03 mg/l (not detected above this) |
| 25 Feb 2026, 10:16 | 0.042 | 0.042 mg/l |
| 14 Jan 2026, 14:38 | 0.053 | 0.053 mg/l |
| 12 Dec 2025, 14:09 | 0.046 | 0.046 mg/l |
| 17 Nov 2025, 15:14 | 0.046 | 0.046 mg/l |
| 29 Oct 2025, 12:44 | 0.033 | 0.033 mg/l |
| 9 Sep 2025, 11:43 | 0.15 | 0.15 mg/l |
| 13 Aug 2025, 11:42 | 0.074 | 0.074 mg/l |
| 31 Jul 2025, 14:28 | 0.065 | 0.065 mg/l |
| 17 Jun 2025, 13:41 | 0.067 | 0.067 mg/l |
| 8 May 2025, 13:57 | 0.061 | 0.061 mg/l |
| 9 Apr 2025, 13:31 | 0.035 | 0.035 mg/l |
| 18 Mar 2025, 13:30 | 0.076 | 0.076 mg/l |
| 27 Jan 2025, 13:50 | 0.12 | 0.12 mg/l |
| 4 Dec 2024, 12:25 | 0.046 | 0.046 mg/l |
| 18 Nov 2024, 14:31 | 0.076 | 0.076 mg/l |
| 15 Oct 2024, 11:53 | 0.042 | 0.042 mg/l |
| 16 Sep 2024, 13:31 | 0.044 | 0.044 mg/l |
| 19 Aug 2024, 08:44 | 0.088 | 0.088 mg/l |
| 25 Jun 2024, 08:34 | 0.074 | 0.074 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
5.77 mg/l
Sampled 29 May 2026, 4 months ago · 21 results banked
Every result (21)
| Sampled | Result as published | Reads as |
|---|---|---|
| 29 May 2026, 09:57 | 5.77 | 5.77 mg/l |
| 1 Apr 2026, 09:59 | 4.29 | 4.29 mg/l |
| 25 Feb 2026, 10:16 | 3.08 | 3.08 mg/l |
| 14 Jan 2026, 14:38 | 4.18 | 4.18 mg/l |
| 12 Dec 2025, 14:09 | 3.58 | 3.58 mg/l |
| 17 Nov 2025, 15:14 | 4.98 | 4.98 mg/l |
| 29 Oct 2025, 12:44 | 2.49 | 2.49 mg/l |
| 9 Sep 2025, 11:43 | 5.67 | 5.67 mg/l |
| 13 Aug 2025, 11:42 | 5.88 | 5.88 mg/l |
| 31 Jul 2025, 14:28 | 5.88 | 5.88 mg/l |
| 17 Jun 2025, 13:41 | 2.39 | 2.39 mg/l |
| 8 May 2025, 13:57 | 6.87 | 6.87 mg/l |
| 9 Apr 2025, 13:31 | 6.98 | 6.98 mg/l |
| 18 Mar 2025, 13:30 | 6.68 | 6.68 mg/l |
| 27 Jan 2025, 13:50 | 3.57 | 3.57 mg/l |
| 4 Dec 2024, 12:25 | 3.67 | 3.67 mg/l |
| 18 Nov 2024, 14:31 | 6.18 | 6.18 mg/l |
| 15 Oct 2024, 11:53 | 4.08 | 4.08 mg/l |
| 16 Sep 2024, 13:31 | 4.29 | 4.29 mg/l |
| 19 Aug 2024, 08:44 | 6.78 | 6.78 mg/l |
| 25 Jun 2024, 08:34 | 5.78 | 5.78 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.12 mg/l
Sampled 29 May 2026, 4 months ago · 21 results banked
Every result (21)
| Sampled | Result as published | Reads as |
|---|---|---|
| 29 May 2026, 09:57 | 0.12 | 0.12 mg/l |
| 1 Apr 2026, 09:59 | 0.079 | 0.079 mg/l |
| 25 Feb 2026, 10:16 | 0.072 | 0.072 mg/l |
| 14 Jan 2026, 14:38 | 0.088 | 0.088 mg/l |
| 12 Dec 2025, 14:09 | 0.079 | 0.079 mg/l |
| 17 Nov 2025, 15:14 | 0.13 | 0.13 mg/l |
| 29 Oct 2025, 12:44 | 0.089 | 0.089 mg/l |
| 9 Sep 2025, 11:43 | 0.26 | 0.26 mg/l |
| 13 Aug 2025, 11:42 | 0.27 | 0.27 mg/l |
| 31 Jul 2025, 14:28 | 0.3 | 0.3 mg/l |
| 17 Jun 2025, 13:41 | 0.16 | 0.16 mg/l |
| 8 May 2025, 13:57 | 0.18 | 0.18 mg/l |
| 9 Apr 2025, 13:31 | 0.11 | 0.11 mg/l |
| 18 Mar 2025, 13:30 | 0.14 | 0.14 mg/l |
| 27 Jan 2025, 13:50 | 0.12 | 0.12 mg/l |
| 4 Dec 2024, 12:25 | 0.097 | 0.097 mg/l |
| 18 Nov 2024, 14:31 | 0.15 | 0.15 mg/l |
| 15 Oct 2024, 11:53 | 0.14 | 0.14 mg/l |
| 16 Sep 2024, 13:31 | 0.17 | 0.17 mg/l |
| 19 Aug 2024, 08:44 | 0.27 | 0.27 mg/l |
| 25 Jun 2024, 08:34 | 0.22 | 0.22 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
632 µS/cm
Sampled 29 May 2026, 4 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 29 May 2026, 09:57 | 632 | 632 µS/cm |
| 1 Apr 2026, 09:59 | 442 | 442 µS/cm |
| 25 Feb 2026, 10:16 | 306 | 306 µS/cm |
| 14 Jan 2026, 14:38 | 283 | 283 µS/cm |
| 12 Dec 2025, 14:09 | 234 | 234 µS/cm |
| 17 Nov 2025, 15:14 | 265 | 265 µS/cm |
| 29 Oct 2025, 12:44 | 286 | 286 µS/cm |
| 9 Sep 2025, 11:43 | 605 | 605 µS/cm |
| 13 Aug 2025, 11:42 | 726 | 726 µS/cm |
| 31 Jul 2025, 14:28 | 670 | 670 µS/cm |
| 17 Jun 2025, 13:41 | 308 | 308 µS/cm |
| 8 May 2025, 13:57 | 736 | 736 µS/cm |
| 9 Apr 2025, 13:31 | 730 | 730 µS/cm |
| 18 Mar 2025, 13:30 | 618 | 618 µS/cm |
| 27 Jan 2025, 13:50 | 378 | 378 µS/cm |
| 4 Dec 2024, 12:25 | 363 | 363 µS/cm |
| 18 Nov 2024, 14:31 | 659 | 659 µS/cm |
| 15 Oct 2024, 11:53 | 445 | 445 µS/cm |
| 16 Sep 2024, 13:31 | 492 | 492 µS/cm |
| 19 Aug 2024, 08:44 | 692 | 692 µS/cm |
| 25 Jun 2024, 08:34 | 631 | 631 µS/cm |
| 10 Apr 2024, 12:20 | 290 | 290 µS/cm |
| 25 Jan 2024, 08:26 | 302 | 302 µS/cm |
| 4 Oct 2023, 13:25 | 220 | 220 µS/cm |
Everything measured here
60 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 60 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 24 | Oct 2023 – May 2026 | 77% 29 May 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 24 | Oct 2023 – May 2026 | 6.86 mg/l 29 May 2026 |
| Temperature of Water 0076 | River water | 24 | Oct 2023 – May 2026 | 20.9 °C 29 May 2026 |
| pH 0061 | River water | 24 | Oct 2023 – May 2026 | 7.61 29 May 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 21 | Jun 2024 – May 2026 | 0.094 mg/l 29 May 2026 |
| Nitrate as N 0117 | River water | 21 | Jun 2024 – May 2026 | 5.77 mg/l 29 May 2026 |
| Orthophosphate, reactive as P 0180 | River water | 21 | Jun 2024 – May 2026 | 0.12 mg/l 29 May 2026 |
| Conductivity at 25 C 0077 | River water | 24 | Oct 2023 – May 2026 | 632 µS/cm 29 May 2026 |
| 11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (F-53B Minor) 2993 | River water | 4 | Apr 2024 – Mar 2025 | below 0.001 µg/l 18 Mar 2025 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (B) 2942 | River water | 4 | Apr 2024 – Mar 2025 | below 0.001 µg/l 18 Mar 2025 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (L) 2991 | River water | 4 | Apr 2024 – Mar 2025 | below 0.001 µg/l 18 Mar 2025 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (B) 2943 | River water | 4 | Apr 2024 – Mar 2025 | below 0.002 µg/l 18 Mar 2025 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (L) 2990 | River water | 4 | Apr 2024 – Mar 2025 | below 0.0005 µg/l 18 Mar 2025 |
| 2H,2H,3H,3H-Perfluorooctanoic acid 2989 | River water | 4 | Apr 2024 – Mar 2025 | below 0.001 µg/l 18 Mar 2025 |
| 3-Perfluoroheptylpropanoic acid 2925 | River water | 4 | Apr 2024 – Mar 2025 | below 0.0005 µg/l 18 Mar 2025 |
| 3:3 Fluorotelomer carboxylic acid 2926 | River water | 4 | Apr 2024 – Mar 2025 | below 0.004 µg/l 18 Mar 2025 |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) 2988 | River water | 4 | Apr 2024 – Mar 2025 | below 0.005 µg/l 18 Mar 2025 |
| 4:2 Fluorotelomer sulfonic acid 2987 | River water | 4 | Apr 2024 – Mar 2025 | below 0.0005 µg/l 18 Mar 2025 |
| 6:2 Fluorotelomer sulfonic acid 2984 | River water | 4 | Apr 2024 – Mar 2025 | below 0.001 µg/l 18 Mar 2025 |
| 8:2 Fluorotelomer sulfonic acid 2983 | River water | 4 | Apr 2024 – Mar 2025 | below 0.001 µg/l 18 Mar 2025 |
| 9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid 2982 | River water | 4 | Apr 2024 – Mar 2025 | below 0.0005 µg/l 18 Mar 2025 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 21 | Jun 2024 – May 2026 | 120 mg/l 29 May 2026 |
| Ammonia un-ionised as N 0119 | River water | 21 | Jun 2024 – May 2026 | 0.00158 mg/l 29 May 2026 |
| BOD : 5 Day ATU 0085 | River water | 21 | Jun 2024 – May 2026 | below 1 mg/l 29 May 2026 |
| Hexafluoropropylene oxide dimer acid (Gen X) 2981 | River water | 4 | Apr 2024 – Mar 2025 | below 0.001 µg/l 18 Mar 2025 |
| N-Ethylperfluorooctanesulfonamide 2977 | River water | 4 | Apr 2024 – Mar 2025 | below 0.002 µg/l 18 Mar 2025 |
| N-methylperfluorooctanesulfonamide 2975 | River water | 4 | Apr 2024 – Mar 2025 | below 0.002 µg/l 18 Mar 2025 |
| Nitrite as N 0118 | River water | 21 | Jun 2024 – May 2026 | 0.033 mg/l 29 May 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 21 | Jun 2024 – May 2026 | 5.8 mg/l 29 May 2026 |
| Perfluoro(2-ethoxyethane)sulfonic acid 2924 | River water | 4 | Apr 2024 – Mar 2025 | below 0.0005 µg/l 18 Mar 2025 |
| Perfluoro(4-methoxybutanoic) acid 2923 | River water | 4 | Apr 2024 – Mar 2025 | below 0.0005 µg/l 18 Mar 2025 |
| Perfluoro-3,6-dioxaheptanoic acid 2922 | River water | 4 | Apr 2024 – Mar 2025 | below 0.0005 µg/l 18 Mar 2025 |
| Perfluoro-3-methoxypropanoic acid 2921 | River water | 4 | Apr 2024 – Mar 2025 | below 0.0005 µg/l 18 Mar 2025 |
| Perfluoro-4-ethylcyclohexanesulfonic acid 2973 | River water | 4 | Apr 2024 – Mar 2025 | below 0.0005 µg/l 18 Mar 2025 |
| Perfluorobutanesulfonic acid 2972 | River water | 4 | Apr 2024 – Mar 2025 | 0.0015 µg/l 18 Mar 2025 |
| Perfluorobutanoic acid 2995 | River water | 4 | Apr 2024 – Mar 2025 | 0.0014 µg/l 18 Mar 2025 |
| Perfluorobutylsulfonamide (perfluorobutane sulfonamide) 2970 | River water | 4 | Apr 2024 – Mar 2025 | below 0.0005 µg/l 18 Mar 2025 |
| Perfluorodecanesulfonic acid 2969 | River water | 4 | Apr 2024 – Mar 2025 | below 0.002 µg/l 18 Mar 2025 |
| Perfluorodecanoic acid 8892 | River water | 4 | Apr 2024 – Mar 2025 | below 0.002 µg/l 18 Mar 2025 |
| Perfluorododecane sulfonic acid 2968 | River water | 4 | Apr 2024 – Mar 2025 | below 0.005 µg/l 18 Mar 2025 |
| Perfluorododecanoic acid 8894 | River water | 4 | Apr 2024 – Mar 2025 | below 0.002 µg/l 18 Mar 2025 |
| Perfluoroheptanesulfonic acid 2967 | River water | 4 | Apr 2024 – Mar 2025 | below 0.0005 µg/l 18 Mar 2025 |
| Perfluoroheptanoic acid 8889 | River water | 4 | Apr 2024 – Mar 2025 | below 0.001 µg/l 18 Mar 2025 |
| Perfluorohexanesulfonamide 2965 | River water | 4 | Apr 2024 – Mar 2025 | below 0.0005 µg/l 18 Mar 2025 |
| Perfluorohexanesulfonic acid (B) 2944 | River water | 4 | Apr 2024 – Mar 2025 | below 0.0005 µg/l 18 Mar 2025 |
| Perfluorohexanesulfonic acid (L) 2964 | River water | 4 | Apr 2024 – Mar 2025 | below 0.0005 µg/l 18 Mar 2025 |
| Perfluorohexanoic acid 8888 | River water | 4 | Apr 2024 – Mar 2025 | 0.00076 µg/l 18 Mar 2025 |
| Perfluorononanesulfonic acid 2963 | River water | 4 | Apr 2024 – Mar 2025 | below 0.0005 µg/l 18 Mar 2025 |
| Perfluorononanoic acid 8891 | River water | 4 | Apr 2024 – Mar 2025 | below 0.001 µg/l 18 Mar 2025 |
| Perfluorooctadecanoic acid 2962 | River water | 4 | Apr 2024 – Mar 2025 | below 0.002 µg/l 18 Mar 2025 |
| Perfluorooctanesulfonamide 2961 | River water | 4 | Apr 2024 – Mar 2025 | below 0.001 µg/l 18 Mar 2025 |
| Perfluorooctanesulfonic acid (branched) 2960 | River water | 4 | Apr 2024 – Mar 2025 | 0.00071 µg/l 18 Mar 2025 |
| Perfluorooctanesulfonic acid (linear) 2959 | River water | 4 | Apr 2024 – Mar 2025 | 0.00075 µg/l 18 Mar 2025 |
| Perfluorooctanoic acid 8890 | River water | 4 | Apr 2024 – Mar 2025 | below 0.0005 µg/l 18 Mar 2025 |
| Perfluoropentanesulfonic acid 2957 | River water | 4 | Apr 2024 – Mar 2025 | below 0.0005 µg/l 18 Mar 2025 |
| Perfluoropentanoic acid 8887 | River water | 4 | Apr 2024 – Mar 2025 | 0.001 µg/l 18 Mar 2025 |
| Perfluorotetradecanoic acid 8895 | River water | 4 | Apr 2024 – Mar 2025 | below 0.006 µg/l 18 Mar 2025 |
| Perfluorotridecanoic acid 2955 | River water | 4 | Apr 2024 – Mar 2025 | below 0.005 µg/l 18 Mar 2025 |
| Perfluoroundecane sulfonic acid 2953 | River water | 4 | Apr 2024 – Mar 2025 | below 0.004 µg/l 18 Mar 2025 |
| Perfluoroundecanoic acid 8893 | River water | 4 | Apr 2024 – Mar 2025 | below 0.002 µg/l 18 Mar 2025 |
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.