Silchester Brook above Silchester sewage treatment works
EA name: SILCHESTER BROOK ABOVE SILCHESTER STW
Environment Agency sampling point TH-PKER0081 · 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
- 12 May 2026, 09:395 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 17 Jun 2024 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 462193, 161252As published, to the nearest 1 m. Open in a map
- River, by its own name
- Silchester Brook
- River, by the map
- Silchester BrookPlaced on the river its name gives, 12 m from the line.
- Next gauge downstream
- Beech Hill On the Foudry Brook · 11 km along the river
- Why it was sampled
- Monitoring (national agency policy) (24 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
93.3%
Sampled 12 May 2026, 5 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 May 2026, 09:39 | 93.3 | 93.3% |
| 24 Apr 2026, 10:04 | 95 | 95% |
| 16 Mar 2026, 10:51 | 91.7 | 91.7% |
| 12 Feb 2026, 11:30 | 91.2 | 91.2% |
| 20 Jan 2026, 11:47 | 91.6 | 91.6% |
| 2 Dec 2025, 13:49 | 87.2 | 87.2% |
| 14 Nov 2025, 12:34 | 80.5 | 80.5% |
| 14 Oct 2025, 12:34 | 84 | 84% |
| 22 Sep 2025, 13:07 | 91.1 | 91.1% |
| 27 Aug 2025, 12:42 | 88.8 | 88.8% |
| 1 Jul 2025, 10:59 | 83.3 | 83.3% |
| 9 Jun 2025, 11:25 | 87.3 | 87.3% |
| 8 May 2025, 09:44 | 88.6 | 88.6% |
| 10 Apr 2025, 12:06 | 97.3 | 97.3% |
| 19 Mar 2025, 10:36 | 96.4 | 96.4% |
| 21 Feb 2025, 10:23 | 91.1 | 91.1% |
| 29 Jan 2025, 10:31 | 96.5 | 96.5% |
| 11 Dec 2024, 13:00 | 73.7 | 73.7% |
| 25 Nov 2024, 11:01 | 86.5 | 86.5% |
| 30 Oct 2024, 09:59 | 79.6 | 79.6% |
| 18 Sep 2024, 09:59 | 86.9 | 86.9% |
| 23 Aug 2024, 12:00 | 84.5 | 84.5% |
| 19 Jul 2024, 09:54 | 86 | 86% |
| 17 Jun 2024, 09:30 | 90.1 | 90.1% |
Dissolved oxygen
as O2 · code 9924 · mg/l
11.1 mg/l
Sampled 12 May 2026, 5 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 May 2026, 09:39 | 11.1 | 11.1 mg/l |
| 24 Apr 2026, 10:04 | 11 | 11 mg/l |
| 16 Mar 2026, 10:51 | 10.8 | 10.8 mg/l |
| 12 Feb 2026, 11:30 | 10.5 | 10.5 mg/l |
| 20 Jan 2026, 11:47 | 10.9 | 10.9 mg/l |
| 2 Dec 2025, 13:49 | 10 | 10 mg/l |
| 14 Nov 2025, 12:34 | 8.4 | 8.4 mg/l |
| 14 Oct 2025, 12:34 | 9.01 | 9.01 mg/l |
| 22 Sep 2025, 13:07 | 9.89 | 9.89 mg/l |
| 27 Aug 2025, 12:42 | 8.69 | 8.69 mg/l |
| 1 Jul 2025, 10:59 | 7.59 | 7.59 mg/l |
| 9 Jun 2025, 11:25 | 9.18 | 9.18 mg/l |
| 8 May 2025, 09:44 | 9.91 | 9.91 mg/l |
| 10 Apr 2025, 12:06 | 11.1 | 11.1 mg/l |
| 19 Mar 2025, 10:36 | 12.3 | 12.3 mg/l |
| 21 Feb 2025, 10:23 | 10.5 | 10.5 mg/l |
| 29 Jan 2025, 10:31 | 12.1 | 12.1 mg/l |
| 11 Dec 2024, 13:00 | 8.85 | 8.85 mg/l |
| 25 Nov 2024, 11:01 | 9.77 | 9.77 mg/l |
| 30 Oct 2024, 09:59 | 8.5 | 8.5 mg/l |
| 18 Sep 2024, 09:59 | 9.01 | 9.01 mg/l |
| 23 Aug 2024, 12:00 | 8.34 | 8.34 mg/l |
| 19 Jul 2024, 09:54 | 8.56 | 8.56 mg/l |
| 17 Jun 2024, 09:30 | 9.62 | 9.62 mg/l |
Water temperature
code 0076 · °C
7.9 °C
Sampled 12 May 2026, 5 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 May 2026, 09:39 | 7.9 | 7.9 °C |
| 24 Apr 2026, 10:04 | 8.9 | 8.9 °C |
| 16 Mar 2026, 10:51 | 8 | 8 °C |
| 12 Feb 2026, 11:30 | 8.9 | 8.9 °C |
| 20 Jan 2026, 11:47 | 7.8 | 7.8 °C |
| 2 Dec 2025, 13:49 | 9.2 | 9.2 °C |
| 14 Nov 2025, 12:34 | 13.3 | 13.3 °C |
| 14 Oct 2025, 12:34 | 12.1 | 12.1 °C |
| 22 Sep 2025, 13:07 | 11.6 | 11.6 °C |
| 27 Aug 2025, 12:42 | 16.3 | 16.3 °C |
| 1 Jul 2025, 10:59 | 19.8 | 19.8 °C |
| 9 Jun 2025, 11:25 | 13 | 13 °C |
| 8 May 2025, 09:44 | 10.3 | 10.3 °C |
| 10 Apr 2025, 12:06 | 9.5 | 9.5 °C |
| 19 Mar 2025, 10:36 | 4.9 | 4.9 °C |
| 21 Feb 2025, 10:23 | 9.1 | 9.1 °C |
| 29 Jan 2025, 10:31 | 5.8 | 5.8 °C |
| 11 Dec 2024, 13:00 | 7.4 | 7.4 °C |
| 25 Nov 2024, 11:01 | 9.9 | 9.9 °C |
| 30 Oct 2024, 09:59 | 12.3 | 12.3 °C |
| 18 Sep 2024, 09:59 | 13.6 | 13.6 °C |
| 23 Aug 2024, 12:00 | 15.9 | 15.9 °C |
| 19 Jul 2024, 09:54 | 15.5 | 15.5 °C |
| 17 Jun 2024, 09:30 | 12.3 | 12.3 °C |
pH
code 0061
7.87
Sampled 12 May 2026, 5 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 May 2026, 09:39 | 7.87 | 7.87 |
| 24 Apr 2026, 10:04 | 7.98 | 7.98 |
| 16 Mar 2026, 10:51 | 7.63 | 7.63 |
| 12 Feb 2026, 11:30 | 7.57 | 7.57 |
| 20 Jan 2026, 11:47 | 7.73 | 7.73 |
| 2 Dec 2025, 13:49 | 7.73 | 7.73 |
| 14 Nov 2025, 12:34 | 7.54 | 7.54 |
| 14 Oct 2025, 12:34 | 7.78 | 7.78 |
| 22 Sep 2025, 13:07 | 8.11 | 8.11 |
| 27 Aug 2025, 12:42 | 8.14 | 8.14 |
| 1 Jul 2025, 10:59 | 7.79 | 7.79 |
| 9 Jun 2025, 11:25 | 7.84 | 7.84 |
| 8 May 2025, 09:44 | 8.04 | 8.04 |
| 10 Apr 2025, 12:06 | 7.87 | 7.87 |
| 19 Mar 2025, 10:36 | 7.93 | 7.93 |
| 21 Feb 2025, 10:23 | 7.66 | 7.66 |
| 29 Jan 2025, 10:31 | 7.56 | 7.56 |
| 11 Dec 2024, 13:00 | 7.25 | 7.25 |
| 25 Nov 2024, 11:01 | 7.44 | 7.44 |
| 30 Oct 2024, 09:59 | 7.53 | 7.53 |
| 18 Sep 2024, 09:59 | 7.32 | 7.32 |
| 23 Aug 2024, 12:00 | 7.85 | 7.85 |
| 19 Jul 2024, 09:54 | 7.91 | 7.91 |
| 17 Jun 2024, 09:30 | 7.95 | 7.95 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 12 May 2026, 5 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 May 2026, 09:39 | <0.03 | below 0.03 mg/l (not detected above this) |
| 24 Apr 2026, 10:04 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Mar 2026, 10:51 | <0.03 | below 0.03 mg/l (not detected above this) |
| 12 Feb 2026, 11:30 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 Jan 2026, 11:47 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Dec 2025, 13:49 | 0.12 | 0.12 mg/l |
| 14 Nov 2025, 12:34 | <0.03 | below 0.03 mg/l (not detected above this) |
| 14 Oct 2025, 12:34 | 0.14 | 0.14 mg/l |
| 22 Sep 2025, 13:07 | <0.03 | below 0.03 mg/l (not detected above this) |
| 27 Aug 2025, 12:42 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Jul 2025, 10:59 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Jun 2025, 11:25 | <0.03 | below 0.03 mg/l (not detected above this) |
| 8 May 2025, 09:44 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Apr 2025, 12:06 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 Mar 2025, 10:36 | <0.03 | below 0.03 mg/l (not detected above this) |
| 21 Feb 2025, 10:23 | 0.032 | 0.032 mg/l |
| 29 Jan 2025, 10:31 | <0.03 | below 0.03 mg/l (not detected above this) |
| 11 Dec 2024, 13:00 | 1 | 1 mg/l |
| 25 Nov 2024, 11:01 | 0.041 | 0.041 mg/l |
| 30 Oct 2024, 09:59 | <0.03 | below 0.03 mg/l (not detected above this) |
| 18 Sep 2024, 09:59 | <0.03 | below 0.03 mg/l (not detected above this) |
| 23 Aug 2024, 12:00 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 Jul 2024, 09:54 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Jun 2024, 09:30 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
0.524 mg/l
Sampled 12 May 2026, 5 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 May 2026, 09:39 | 0.524 | 0.524 mg/l |
| 24 Apr 2026, 10:04 | 0.474 | 0.474 mg/l |
| 16 Mar 2026, 10:51 | 0.836 | 0.836 mg/l |
| 12 Feb 2026, 11:30 | 1.19 | 1.19 mg/l |
| 20 Jan 2026, 11:47 | 1.39 | 1.39 mg/l |
| 2 Dec 2025, 13:49 | 1.91 | 1.91 mg/l |
| 14 Nov 2025, 12:34 | 1.29 | 1.29 mg/l |
| 14 Oct 2025, 12:34 | 0.455 | 0.455 mg/l |
| 22 Sep 2025, 13:07 | 0.316 | 0.316 mg/l |
| 27 Aug 2025, 12:42 | 0.306 | 0.306 mg/l |
| 1 Jul 2025, 10:59 | 0.414 | 0.414 mg/l |
| 9 Jun 2025, 11:25 | 0.542 | 0.542 mg/l |
| 8 May 2025, 09:44 | 0.445 | 0.445 mg/l |
| 10 Apr 2025, 12:06 | 0.412 | 0.412 mg/l |
| 19 Mar 2025, 10:36 | 0.456 | 0.456 mg/l |
| 21 Feb 2025, 10:23 | 0.742 | 0.742 mg/l |
| 29 Jan 2025, 10:31 | 1.39 | 1.39 mg/l |
| 11 Dec 2024, 13:00 | 9.21 | 9.21 mg/l |
| 25 Nov 2024, 11:01 | 1.69 | 1.69 mg/l |
| 30 Oct 2024, 09:59 | 0.336 | 0.336 mg/l |
| 18 Sep 2024, 09:59 | 0.406 | 0.406 mg/l |
| 23 Aug 2024, 12:00 | 0.436 | 0.436 mg/l |
| 19 Jul 2024, 09:54 | 0.576 | 0.576 mg/l |
| 17 Jun 2024, 09:30 | 0.653 | 0.653 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.067 mg/l
Sampled 12 May 2026, 5 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 May 2026, 09:39 | 0.067 | 0.067 mg/l |
| 24 Apr 2026, 10:04 | 0.057 | 0.057 mg/l |
| 16 Mar 2026, 10:51 | 0.042 | 0.042 mg/l |
| 12 Feb 2026, 11:30 | 0.05 | 0.05 mg/l |
| 20 Jan 2026, 11:47 | 0.061 | 0.061 mg/l |
| 2 Dec 2025, 13:49 | 0.064 | 0.064 mg/l |
| 14 Nov 2025, 12:34 | 0.058 | 0.058 mg/l |
| 14 Oct 2025, 12:34 | 0.072 | 0.072 mg/l |
| 22 Sep 2025, 13:07 | 0.08 | 0.08 mg/l |
| 27 Aug 2025, 12:42 | 0.094 | 0.094 mg/l |
| 1 Jul 2025, 10:59 | 0.09 | 0.09 mg/l |
| 9 Jun 2025, 11:25 | 0.063 | 0.063 mg/l |
| 8 May 2025, 09:44 | 0.058 | 0.058 mg/l |
| 10 Apr 2025, 12:06 | 0.039 | 0.039 mg/l |
| 19 Mar 2025, 10:36 | 0.03 | 0.03 mg/l |
| 21 Feb 2025, 10:23 | 0.036 | 0.036 mg/l |
| 29 Jan 2025, 10:31 | 0.048 | 0.048 mg/l |
| 11 Dec 2024, 13:00 | 0.28 | 0.28 mg/l |
| 25 Nov 2024, 11:01 | 0.09 | 0.09 mg/l |
| 30 Oct 2024, 09:59 | 0.047 | 0.047 mg/l |
| 18 Sep 2024, 09:59 | 0.051 | 0.051 mg/l |
| 23 Aug 2024, 12:00 | 0.075 | 0.075 mg/l |
| 19 Jul 2024, 09:54 | 0.053 | 0.053 mg/l |
| 17 Jun 2024, 09:30 | 0.062 | 0.062 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
514 µS/cm
Sampled 12 May 2026, 5 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 May 2026, 09:39 | 514 | 514 µS/cm |
| 24 Apr 2026, 10:04 | 469 | 469 µS/cm |
| 16 Mar 2026, 10:51 | 355 | 355 µS/cm |
| 12 Feb 2026, 11:30 | 325 | 325 µS/cm |
| 20 Jan 2026, 11:47 | 410 | 410 µS/cm |
| 2 Dec 2025, 13:49 | 478 | 478 µS/cm |
| 14 Nov 2025, 12:34 | 374 | 374 µS/cm |
| 14 Oct 2025, 12:34 | 568 | 568 µS/cm |
| 22 Sep 2025, 13:07 | 564 | 564 µS/cm |
| 27 Aug 2025, 12:42 | 581 | 581 µS/cm |
| 1 Jul 2025, 10:59 | 573 | 573 µS/cm |
| 9 Jun 2025, 11:25 | 504 | 504 µS/cm |
| 8 May 2025, 09:44 | 511 | 511 µS/cm |
| 10 Apr 2025, 12:06 | 446 | 446 µS/cm |
| 19 Mar 2025, 10:36 | 394 | 394 µS/cm |
| 21 Feb 2025, 10:23 | 368 | 368 µS/cm |
| 29 Jan 2025, 10:31 | 332 | 332 µS/cm |
| 11 Dec 2024, 13:00 | 302 | 302 µS/cm |
| 25 Nov 2024, 11:01 | 288 | 288 µS/cm |
| 30 Oct 2024, 09:59 | 419 | 419 µS/cm |
| 18 Sep 2024, 09:59 | 610 | 610 µS/cm |
| 23 Aug 2024, 12:00 | 473 | 473 µS/cm |
| 19 Jul 2024, 09:54 | 465 | 465 µS/cm |
| 17 Jun 2024, 09:30 | 477 | 477 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 | Jun 2024 – May 2026 | 93.3% 12 May 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 24 | Jun 2024 – May 2026 | 11.1 mg/l 12 May 2026 |
| Temperature of Water 0076 | River water | 24 | Jun 2024 – May 2026 | 7.9 °C 12 May 2026 |
| pH 0061 | River water | 24 | Jun 2024 – May 2026 | 7.87 12 May 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 24 | Jun 2024 – May 2026 | below 0.03 mg/l 12 May 2026 |
| Nitrate as N 0117 | River water | 24 | Jun 2024 – May 2026 | 0.524 mg/l 12 May 2026 |
| Orthophosphate, reactive as P 0180 | River water | 24 | Jun 2024 – May 2026 | 0.067 mg/l 12 May 2026 |
| Conductivity at 25 C 0077 | River water | 24 | Jun 2024 – May 2026 | 514 µS/cm 12 May 2026 |
| 11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (F-53B Minor) 2993 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 11 Dec 2024 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (B) 2942 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 11 Dec 2024 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (L) 2991 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 11 Dec 2024 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (B) 2943 | River water | 1 | Dec 2024 – Dec 2024 | below 0.002 µg/l 11 Dec 2024 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (L) 2990 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 11 Dec 2024 |
| 2H,2H,3H,3H-Perfluorooctanoic acid 2989 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 11 Dec 2024 |
| 3-Perfluoroheptylpropanoic acid 2925 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 11 Dec 2024 |
| 3:3 Fluorotelomer carboxylic acid 2926 | River water | 1 | Dec 2024 – Dec 2024 | below 0.004 µg/l 11 Dec 2024 |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) 2988 | River water | 1 | Dec 2024 – Dec 2024 | below 0.005 µg/l 11 Dec 2024 |
| 4:2 Fluorotelomer sulfonic acid 2987 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 11 Dec 2024 |
| 6:2 Fluorotelomer sulfonic acid 2984 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 11 Dec 2024 |
| 8:2 Fluorotelomer sulfonic acid 2983 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 11 Dec 2024 |
| 9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid 2982 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 11 Dec 2024 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 24 | Jun 2024 – May 2026 | 180 mg/l 12 May 2026 |
| Ammonia un-ionised as N 0119 | River water | 24 | Jun 2024 – May 2026 | below 0.00035 mg/l 12 May 2026 |
| BOD : 5 Day ATU 0085 | River water | 23 | Jun 2024 – May 2026 | 1.7 mg/l 12 May 2026 |
| Hexafluoropropylene oxide dimer acid (Gen X) 2981 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 11 Dec 2024 |
| N-Ethylperfluorooctanesulfonamide 2977 | River water | 1 | Dec 2024 – Dec 2024 | below 0.002 µg/l 11 Dec 2024 |
| N-methylperfluorooctanesulfonamide 2975 | River water | 1 | Dec 2024 – Dec 2024 | below 0.002 µg/l 11 Dec 2024 |
| Nitrite as N 0118 | River water | 24 | Jun 2024 – May 2026 | 0.0062 mg/l 12 May 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 24 | Jun 2024 – May 2026 | 0.53 mg/l 12 May 2026 |
| Perfluoro(2-ethoxyethane)sulfonic acid 2924 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 11 Dec 2024 |
| Perfluoro(4-methoxybutanoic) acid 2923 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 11 Dec 2024 |
| Perfluoro-3,6-dioxaheptanoic acid 2922 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 11 Dec 2024 |
| Perfluoro-3-methoxypropanoic acid 2921 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 11 Dec 2024 |
| Perfluoro-4-ethylcyclohexanesulfonic acid 2973 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 11 Dec 2024 |
| Perfluorobutanesulfonic acid 2972 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 11 Dec 2024 |
| Perfluorobutanoic acid 2995 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 11 Dec 2024 |
| Perfluorobutylsulfonamide (perfluorobutane sulfonamide) 2970 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 11 Dec 2024 |
| Perfluorodecanesulfonic acid 2969 | River water | 1 | Dec 2024 – Dec 2024 | below 0.002 µg/l 11 Dec 2024 |
| Perfluorodecanoic acid 8892 | River water | 1 | Dec 2024 – Dec 2024 | below 0.002 µg/l 11 Dec 2024 |
| Perfluorododecane sulfonic acid 2968 | River water | 1 | Dec 2024 – Dec 2024 | below 0.005 µg/l 11 Dec 2024 |
| Perfluorododecanoic acid 8894 | River water | 1 | Dec 2024 – Dec 2024 | below 0.002 µg/l 11 Dec 2024 |
| Perfluoroheptanesulfonic acid 2967 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 11 Dec 2024 |
| Perfluoroheptanoic acid 8889 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 11 Dec 2024 |
| Perfluorohexanesulfonamide 2965 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 11 Dec 2024 |
| Perfluorohexanesulfonic acid (B) 2944 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 11 Dec 2024 |
| Perfluorohexanesulfonic acid (L) 2964 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 11 Dec 2024 |
| Perfluorohexanoic acid 8888 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 11 Dec 2024 |
| Perfluorononanesulfonic acid 2963 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 11 Dec 2024 |
| Perfluorononanoic acid 8891 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 11 Dec 2024 |
| Perfluorooctadecanoic acid 2962 | River water | 1 | Dec 2024 – Dec 2024 | below 0.002 µg/l 11 Dec 2024 |
| Perfluorooctanesulfonamide 2961 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 11 Dec 2024 |
| Perfluorooctanesulfonic acid (branched) 2960 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 11 Dec 2024 |
| Perfluorooctanesulfonic acid (linear) 2959 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 11 Dec 2024 |
| Perfluorooctanoic acid 8890 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 11 Dec 2024 |
| Perfluoropentanesulfonic acid 2957 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 11 Dec 2024 |
| Perfluoropentanoic acid 8887 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 11 Dec 2024 |
| Perfluorotetradecanoic acid 8895 | River water | 1 | Dec 2024 – Dec 2024 | below 0.006 µg/l 11 Dec 2024 |
| Perfluorotridecanoic acid 2955 | River water | 1 | Dec 2024 – Dec 2024 | below 0.005 µg/l 11 Dec 2024 |
| Perfluoroundecane sulfonic acid 2953 | River water | 1 | Dec 2024 – Dec 2024 | below 0.004 µg/l 11 Dec 2024 |
| Perfluoroundecanoic acid 8893 | River water | 1 | Dec 2024 – Dec 2024 | below 0.002 µg/l 11 Dec 2024 |
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.