Downstream Mersham
EA name: DOWNSTREAM MERSHAM (also listed as “RSN1569 - DOWNSTREAM MERSHAM”)
Environment Agency sampling point SO-RSN1569 · 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
- 3 Sep 2026, 08:4228 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 37 since 16 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 605131, 140332As published, to the nearest 1 m. Open in a map
- River, by its own name
- Its name does not give one
- River, by the map
- An unnamed streamPlaced by position alone (the only river line close by), 1 m from the line.
- Next gauge downstream
- None tracedThe map stops before any gauge.
- Why it was sampled
- Monitoring (national agency policy) (37 samples)
13 visits found no water to sample (recorded as “No flow”).
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
99.3%
Sampled 12 Mar 2026, 7 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Mar 2026, 12:22 | 99.3 | 99.3% |
| 17 Feb 2026, 13:32 | 91.9 | 91.9% |
| 9 Jan 2026, 10:39 | 95.7 | 95.7% |
| 1 Dec 2025, 10:21 | 89.5 | 89.5% |
| 5 Nov 2025, 14:01 | 81.9 | 81.9% |
| 29 May 2025, 10:38 | 73.5 | 73.5% |
| 3 Apr 2025, 12:08 | 105.3 | 105.3% |
| 13 Mar 2025, 11:08 | 105.7 | 105.7% |
| 6 Feb 2025, 12:01 | 98.6 | 98.6% |
| 20 Jan 2025, 09:04 | 96.1 | 96.1% |
| 16 Dec 2024, 10:37 | 92.5 | 92.5% |
| 18 Nov 2024, 11:17 | 90.2 | 90.2% |
| 8 Oct 2024, 10:25 | 95.4 | 95.4% |
| 16 Sep 2024, 09:02 | 86.4 | 86.4% |
| 17 Jul 2024, 08:13 | 89.1 | 89.1% |
| 19 Jun 2024, 13:51 | 80 | 80% |
| 16 May 2024, 12:03 | 94.4 | 94.4% |
| 23 Apr 2024, 10:44 | 98.1 | 98.1% |
| 5 Apr 2024, 11:16 | 95.1 | 95.1% |
| 20 Mar 2024, 10:39 | 99.2 | 99.2% |
| 22 Feb 2024, 10:06 | 92.3 | 92.3% |
| 16 Jan 2024, 10:59 | 96.9 | 96.9% |
| 7 Dec 2023, 08:48 | 89.5 | 89.5% |
| 20 Nov 2023, 12:22 | 88.7 | 88.7% |
Dissolved oxygen
as O2 · code 9924 · mg/l
11.2 mg/l
Sampled 12 Mar 2026, 7 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Mar 2026, 12:22 | 11.2 | 11.2 mg/l |
| 17 Feb 2026, 13:32 | 11.1 | 11.1 mg/l |
| 9 Jan 2026, 10:39 | 12.8 | 12.8 mg/l |
| 1 Dec 2025, 10:21 | 10.5 | 10.5 mg/l |
| 5 Nov 2025, 14:01 | 8.51 | 8.51 mg/l |
| 29 May 2025, 10:38 | 7.47 | 7.47 mg/l |
| 3 Apr 2025, 12:08 | 10.8 | 10.8 mg/l |
| 13 Mar 2025, 11:08 | 12.6 | 12.6 mg/l |
| 6 Feb 2025, 12:01 | 12 | 12 mg/l |
| 20 Jan 2025, 09:04 | 12.4 | 12.4 mg/l |
| 16 Dec 2024, 10:37 | 10.6 | 10.6 mg/l |
| 18 Nov 2024, 11:17 | 10.3 | 10.3 mg/l |
| 8 Oct 2024, 10:25 | 9.76 | 9.76 mg/l |
| 16 Sep 2024, 09:02 | 8.9 | 8.9 mg/l |
| 17 Jul 2024, 08:13 | 8.92 | 8.92 mg/l |
| 19 Jun 2024, 13:51 | 7.99 | 7.99 mg/l |
| 16 May 2024, 12:03 | 9.85 | 9.85 mg/l |
| 23 Apr 2024, 10:44 | 11.3 | 11.3 mg/l |
| 5 Apr 2024, 11:16 | 10.2 | 10.2 mg/l |
| 20 Mar 2024, 10:39 | 10.9 | 10.9 mg/l |
| 22 Feb 2024, 10:06 | 10.5 | 10.5 mg/l |
| 16 Jan 2024, 10:59 | 13.2 | 13.2 mg/l |
| 7 Dec 2023, 08:48 | 11 | 11 mg/l |
| 20 Nov 2023, 12:22 | 9.83 | 9.83 mg/l |
Water temperature
code 0076 · °C
10.1 °C
Sampled 12 Mar 2026, 7 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Mar 2026, 12:22 | 10.1 | 10.1 °C |
| 17 Feb 2026, 13:32 | 7 | 7 °C |
| 9 Jan 2026, 10:39 | 3.2 | 3.2 °C |
| 1 Dec 2025, 10:21 | 8.5 | 8.5 °C |
| 5 Nov 2025, 14:01 | 13.5 | 13.5 °C |
| 29 May 2025, 10:38 | 14.5 | 14.5 °C |
| 3 Apr 2025, 12:08 | 14 | 14 °C |
| 13 Mar 2025, 11:08 | 7.7 | 7.7 °C |
| 6 Feb 2025, 12:01 | 6.8 | 6.8 °C |
| 20 Jan 2025, 09:04 | 4.4 | 4.4 °C |
| 16 Dec 2024, 10:37 | 9.1 | 9.1 °C |
| 18 Nov 2024, 11:17 | 9.4 | 9.4 °C |
| 8 Oct 2024, 10:25 | 14.2 | 14.2 °C |
| 16 Sep 2024, 09:02 | 13.9 | 13.9 °C |
| 17 Jul 2024, 08:13 | 15.2 | 15.2 °C |
| 19 Jun 2024, 13:51 | 15.3 | 15.3 °C |
| 16 May 2024, 12:03 | 13.3 | 13.3 °C |
| 23 Apr 2024, 10:44 | 8.9 | 8.9 °C |
| 5 Apr 2024, 11:16 | 12 | 12 °C |
| 20 Mar 2024, 10:39 | 11.1 | 11.1 °C |
| 22 Feb 2024, 10:06 | 9.4 | 9.4 °C |
| 16 Jan 2024, 10:59 | 2.5 | 2.5 °C |
| 7 Dec 2023, 08:48 | 6.6 | 6.6 °C |
| 20 Nov 2023, 12:22 | 10.7 | 10.7 °C |
pH
code 0061
8.21
Sampled 12 Mar 2026, 7 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Mar 2026, 12:22 | 8.21 | 8.21 |
| 17 Feb 2026, 13:32 | 7.97 | 7.97 |
| 9 Jan 2026, 10:39 | 7.75 | 7.75 |
| 1 Dec 2025, 10:21 | 7.85 | 7.85 |
| 5 Nov 2025, 14:01 | 7.72 | 7.72 |
| 29 May 2025, 10:38 | 8.04 | 8.04 |
| 3 Apr 2025, 12:08 | 8.27 | 8.27 |
| 13 Mar 2025, 11:08 | 8.32 | 8.32 |
| 6 Feb 2025, 12:01 | 8.1 | 8.1 |
| 20 Jan 2025, 09:04 | 8.06 | 8.06 |
| 16 Dec 2024, 10:37 | 7.96 | 7.96 |
| 18 Nov 2024, 11:17 | 7.99 | 7.99 |
| 8 Oct 2024, 10:25 | 8 | 8 |
| 16 Sep 2024, 09:02 | 8.04 | 8.04 |
| 17 Jul 2024, 08:13 | 8.1 | 8.1 |
| 19 Jun 2024, 13:51 | 8.1 | 8.1 |
| 16 May 2024, 12:03 | 8.02 | 8.02 |
| 23 Apr 2024, 10:44 | 8.16 | 8.16 |
| 5 Apr 2024, 11:16 | 7.93 | 7.93 |
| 20 Mar 2024, 10:39 | 8.04 | 8.04 |
| 22 Feb 2024, 10:06 | 7.95 | 7.95 |
| 16 Jan 2024, 10:59 | 8.12 | 8.12 |
| 7 Dec 2023, 08:48 | 7.77 | 7.77 |
| 20 Nov 2023, 12:22 | 7.82 | 7.82 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 12 Mar 2026, 7 months ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Mar 2026, 12:22 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Feb 2026, 13:32 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Jan 2026, 10:39 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Dec 2025, 10:21 | <0.03 | below 0.03 mg/l (not detected above this) |
| 29 May 2025, 10:38 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Apr 2025, 12:08 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 Mar 2025, 11:08 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 Feb 2025, 12:01 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 Jan 2025, 09:04 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Dec 2024, 10:37 | <0.03 | below 0.03 mg/l (not detected above this) |
| 18 Nov 2024, 11:17 | <0.03 | below 0.03 mg/l (not detected above this) |
| 8 Oct 2024, 10:25 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Sep 2024, 09:02 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Jul 2024, 08:13 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 Jun 2024, 13:51 | 0.094 | 0.094 mg/l |
| 16 May 2024, 12:03 | <0.03 | below 0.03 mg/l (not detected above this) |
| 23 Apr 2024, 10:44 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Apr 2024, 11:16 | 0.043 | 0.043 mg/l |
| 20 Mar 2024, 10:39 | <0.03 | below 0.03 mg/l (not detected above this) |
| 22 Feb 2024, 10:06 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Jan 2024, 10:59 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 Dec 2023, 08:48 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 Nov 2023, 12:22 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
0.996 mg/l
Sampled 12 Mar 2026, 7 months ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Mar 2026, 12:22 | 0.996 | 0.996 mg/l |
| 17 Feb 2026, 13:32 | 2.5 | 2.5 mg/l |
| 9 Jan 2026, 10:39 | 3.3 | 3.3 mg/l |
| 1 Dec 2025, 10:21 | 0.996 | 0.996 mg/l |
| 29 May 2025, 10:38 | 0.883 | 0.883 mg/l |
| 3 Apr 2025, 12:08 | 0.286 | 0.286 mg/l |
| 13 Mar 2025, 11:08 | 1.4 | 1.4 mg/l |
| 6 Feb 2025, 12:01 | 2.59 | 2.59 mg/l |
| 20 Jan 2025, 09:04 | 2.59 | 2.59 mg/l |
| 16 Dec 2024, 10:37 | 2.88 | 2.88 mg/l |
| 18 Nov 2024, 11:17 | <0.196 | below 0.196 mg/l (not detected above this) |
| 8 Oct 2024, 10:25 | 0.316 | 0.316 mg/l |
| 16 Sep 2024, 09:02 | 0.366 | 0.366 mg/l |
| 17 Jul 2024, 08:13 | 3.29 | 3.29 mg/l |
| 19 Jun 2024, 13:51 | 0.592 | 0.592 mg/l |
| 16 May 2024, 12:03 | 0.526 | 0.526 mg/l |
| 23 Apr 2024, 10:44 | 0.686 | 0.686 mg/l |
| 5 Apr 2024, 11:16 | 2.98 | 2.98 mg/l |
| 20 Mar 2024, 10:39 | 2.29 | 2.29 mg/l |
| 22 Feb 2024, 10:06 | 3.29 | 3.29 mg/l |
| 16 Jan 2024, 10:59 | 3.09 | 3.09 mg/l |
| 7 Dec 2023, 08:48 | 4.29 | 4.29 mg/l |
| 20 Nov 2023, 12:22 | 3.99 | 3.99 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.053 mg/l
Sampled 12 Mar 2026, 7 months ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Mar 2026, 12:22 | 0.053 | 0.053 mg/l |
| 17 Feb 2026, 13:32 | 0.051 | 0.051 mg/l |
| 9 Jan 2026, 10:39 | 0.13 | 0.13 mg/l |
| 1 Dec 2025, 10:21 | 0.088 | 0.088 mg/l |
| 29 May 2025, 10:38 | 0.064 | 0.064 mg/l |
| 3 Apr 2025, 12:08 | 0.027 | 0.027 mg/l |
| 13 Mar 2025, 11:08 | 0.042 | 0.042 mg/l |
| 6 Feb 2025, 12:01 | 0.048 | 0.048 mg/l |
| 20 Jan 2025, 09:04 | 0.054 | 0.054 mg/l |
| 16 Dec 2024, 10:37 | 0.057 | 0.057 mg/l |
| 18 Nov 2024, 11:17 | 0.11 | 0.11 mg/l |
| 8 Oct 2024, 10:25 | 0.076 | 0.076 mg/l |
| 16 Sep 2024, 09:02 | 0.087 | 0.087 mg/l |
| 17 Jul 2024, 08:13 | 0.084 | 0.084 mg/l |
| 19 Jun 2024, 13:51 | 0.095 | 0.095 mg/l |
| 16 May 2024, 12:03 | 0.089 | 0.089 mg/l |
| 23 Apr 2024, 10:44 | 0.036 | 0.036 mg/l |
| 5 Apr 2024, 11:16 | 0.053 | 0.053 mg/l |
| 20 Mar 2024, 10:39 | 0.069 | 0.069 mg/l |
| 22 Feb 2024, 10:06 | 0.063 | 0.063 mg/l |
| 16 Jan 2024, 10:59 | 0.055 | 0.055 mg/l |
| 7 Dec 2023, 08:48 | 0.056 | 0.056 mg/l |
| 20 Nov 2023, 12:22 | 0.062 | 0.062 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
617 µS/cm
Sampled 12 Mar 2026, 7 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Mar 2026, 12:22 | 617 | 617 µS/cm |
| 17 Feb 2026, 13:32 | 563 | 563 µS/cm |
| 9 Jan 2026, 10:39 | 452 | 452 µS/cm |
| 1 Dec 2025, 10:21 | 591 | 591 µS/cm |
| 5 Nov 2025, 14:01 | 525 | 525 µS/cm |
| 29 May 2025, 10:38 | 1327 | 1327 µS/cm |
| 3 Apr 2025, 12:08 | 655 | 655 µS/cm |
| 13 Mar 2025, 11:08 | 640 | 640 µS/cm |
| 6 Feb 2025, 12:01 | 638 | 638 µS/cm |
| 20 Jan 2025, 09:04 | 658 | 658 µS/cm |
| 16 Dec 2024, 10:37 | 644 | 644 µS/cm |
| 18 Nov 2024, 11:17 | 660 | 660 µS/cm |
| 8 Oct 2024, 10:25 | 562 | 562 µS/cm |
| 16 Sep 2024, 09:02 | 560 | 560 µS/cm |
| 17 Jul 2024, 08:13 | 638 | 638 µS/cm |
| 19 Jun 2024, 13:51 | 587 | 587 µS/cm |
| 16 May 2024, 12:03 | 681 | 681 µS/cm |
| 23 Apr 2024, 10:44 | 636 | 636 µS/cm |
| 5 Apr 2024, 11:16 | 599 | 599 µS/cm |
| 20 Mar 2024, 10:39 | 602 | 602 µS/cm |
| 22 Feb 2024, 10:06 | 567 | 567 µS/cm |
| 16 Jan 2024, 10:59 | 629 | 629 µS/cm |
| 7 Dec 2023, 08:48 | 562 | 562 µS/cm |
| 20 Nov 2023, 12:22 | 552 | 552 µS/cm |
Everything measured here
69 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 69 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 24 | Nov 2023 – Mar 2026 | 99.3% 12 Mar 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 24 | Nov 2023 – Mar 2026 | 11.2 mg/l 12 Mar 2026 |
| Temperature of Water 0076 | River water | 24 | Nov 2023 – Mar 2026 | 10.1 °C 12 Mar 2026 |
| pH 0061 | River water | 24 | Nov 2023 – Mar 2026 | 8.21 12 Mar 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 23 | Nov 2023 – Mar 2026 | below 0.03 mg/l 12 Mar 2026 |
| Nitrate as N 0117 | River water | 23 | Nov 2023 – Mar 2026 | 0.996 mg/l 12 Mar 2026 |
| Orthophosphate, reactive as P 0180 | River water | 23 | Nov 2023 – Mar 2026 | 0.053 mg/l 12 Mar 2026 |
| Conductivity at 25 C 0077 | River water | 24 | Nov 2023 – Mar 2026 | 617 µS/cm 12 Mar 2026 |
| 11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (F-53B Minor) 2993 | River water | 2 | Jul 2024 – Oct 2024 | below 0.001 µg/l 8 Oct 2024 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (B) 2942 | River water | 2 | Jul 2024 – Oct 2024 | below 0.001 µg/l 8 Oct 2024 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (L) 2991 | River water | 2 | Jul 2024 – Oct 2024 | below 0.001 µg/l 8 Oct 2024 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (B) 2943 | River water | 2 | Jul 2024 – Oct 2024 | below 0.002 µg/l 8 Oct 2024 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (L) 2990 | River water | 2 | Jul 2024 – Oct 2024 | below 0.0005 µg/l 8 Oct 2024 |
| 2H,2H,3H,3H-Perfluorooctanoic acid 2989 | River water | 2 | Jul 2024 – Oct 2024 | below 0.001 µg/l 8 Oct 2024 |
| 3-Perfluoroheptylpropanoic acid 2925 | River water | 2 | Jul 2024 – Oct 2024 | below 0.0005 µg/l 8 Oct 2024 |
| 3:3 Fluorotelomer carboxylic acid 2926 | River water | 2 | Jul 2024 – Oct 2024 | below 0.004 µg/l 8 Oct 2024 |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) 2988 | River water | 2 | Jul 2024 – Oct 2024 | below 0.005 µg/l 8 Oct 2024 |
| 4:2 Fluorotelomer sulfonic acid 2987 | River water | 2 | Jul 2024 – Oct 2024 | below 0.0005 µg/l 8 Oct 2024 |
| 6:2 Fluorotelomer sulfonic acid 2984 | River water | 2 | Jul 2024 – Oct 2024 | below 0.001 µg/l 8 Oct 2024 |
| 8:2 Fluorotelomer sulfonic acid 2983 | River water | 2 | Jul 2024 – Oct 2024 | below 0.001 µg/l 8 Oct 2024 |
| 9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid 2982 | River water | 2 | Jul 2024 – Oct 2024 | below 0.0005 µg/l 8 Oct 2024 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 23 | Nov 2023 – Mar 2026 | 270 mg/l 12 Mar 2026 |
| Ammonia un-ionised as N 0119 | River water | 23 | Nov 2023 – Mar 2026 | below 0.00055 mg/l 12 Mar 2026 |
| BOD : 5 Day ATU 0085 | River water | 14 | Feb 2024 – Jan 2026 | 1.7 mg/l 9 Jan 2026 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 22 | Nov 2023 – Mar 2026 | 3.9 mg/l 12 Mar 2026 |
| Chloride 0172 | River water | 22 | Nov 2023 – Mar 2026 | 26 mg/l 12 Mar 2026 |
| Flow Type 2896 | River water | 23 | Aug 2024 – Sep 2026 | Dry 3 Sep 2026 |
| GCMS Screen : Target Based multi-residue screening : Semi Quantitative 4994 | River water | 1 | Feb 2026 – Feb 2026 | 1 text result 17 Feb 2026 |
| Hexafluoropropylene oxide dimer acid (Gen X) 2981 | River water | 2 | Jul 2024 – Oct 2024 | below 0.001 µg/l 8 Oct 2024 |
| N-Ethylperfluorooctanesulfonamide 2977 | River water | 2 | Jul 2024 – Oct 2024 | below 0.002 µg/l 8 Oct 2024 |
| N-methylperfluorooctanesulfonamide 2975 | River water | 2 | Jul 2024 – Oct 2024 | below 0.002 µg/l 8 Oct 2024 |
| Nitrite as N 0118 | River water | 23 | Nov 2023 – Mar 2026 | below 0.004 mg/l 12 Mar 2026 |
| Nitrogen, Total as N 9686 | River water | 21 | Nov 2023 – Mar 2026 | 1.3 mg/l 12 Mar 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 23 | Nov 2023 – Mar 2026 | 1 mg/l 12 Mar 2026 |
| No flow /No sample 7668 | River water | 13 | Oct 2023 – Sep 2026 | No flow/discharge at sampling point 3 Sep 2026 |
| Perfluoro(2-ethoxyethane)sulfonic acid 2924 | River water | 2 | Jul 2024 – Oct 2024 | below 0.0005 µg/l 8 Oct 2024 |
| Perfluoro(4-methoxybutanoic) acid 2923 | River water | 2 | Jul 2024 – Oct 2024 | below 0.0005 µg/l 8 Oct 2024 |
| Perfluoro-3,6-dioxaheptanoic acid 2922 | River water | 2 | Jul 2024 – Oct 2024 | below 0.0005 µg/l 8 Oct 2024 |
| Perfluoro-3-methoxypropanoic acid 2921 | River water | 2 | Jul 2024 – Oct 2024 | below 0.0005 µg/l 8 Oct 2024 |
| Perfluoro-4-ethylcyclohexanesulfonic acid 2973 | River water | 2 | Jul 2024 – Oct 2024 | below 0.0005 µg/l 8 Oct 2024 |
| Perfluorobutanesulfonic acid 2972 | River water | 2 | Jul 2024 – Oct 2024 | below 0.001 µg/l 8 Oct 2024 |
| Perfluorobutanoic acid 2995 | River water | 2 | Jul 2024 – Oct 2024 | below 0.001 µg/l 8 Oct 2024 |
| Perfluorobutylsulfonamide (perfluorobutane sulfonamide) 2970 | River water | 2 | Jul 2024 – Oct 2024 | below 0.0005 µg/l 8 Oct 2024 |
| Perfluorodecanesulfonic acid 2969 | River water | 1 | Oct 2024 – Oct 2024 | below 0.002 µg/l 8 Oct 2024 |
| Perfluorodecanoic acid 8892 | River water | 2 | Jul 2024 – Oct 2024 | below 0.002 µg/l 8 Oct 2024 |
| Perfluorododecane sulfonic acid 2968 | River water | 2 | Jul 2024 – Oct 2024 | below 0.005 µg/l 8 Oct 2024 |
| Perfluorododecanoic acid 8894 | River water | 2 | Jul 2024 – Oct 2024 | below 0.002 µg/l 8 Oct 2024 |
| Perfluoroheptanesulfonic acid 2967 | River water | 2 | Jul 2024 – Oct 2024 | below 0.0005 µg/l 8 Oct 2024 |
| Perfluoroheptanoic acid 8889 | River water | 2 | Jul 2024 – Oct 2024 | below 0.001 µg/l 8 Oct 2024 |
| Perfluorohexanesulfonamide 2965 | River water | 2 | Jul 2024 – Oct 2024 | below 0.0005 µg/l 8 Oct 2024 |
| Perfluorohexanesulfonic acid (B) 2944 | River water | 2 | Jul 2024 – Oct 2024 | below 0.0005 µg/l 8 Oct 2024 |
| Perfluorohexanesulfonic acid (L) 2964 | River water | 2 | Jul 2024 – Oct 2024 | below 0.0005 µg/l 8 Oct 2024 |
| Perfluorohexanoic acid 8888 | River water | 2 | Jul 2024 – Oct 2024 | below 0.0005 µg/l 8 Oct 2024 |
| Perfluorononanesulfonic acid 2963 | River water | 2 | Jul 2024 – Oct 2024 | below 0.0005 µg/l 8 Oct 2024 |
| Perfluorononanoic acid 8891 | River water | 2 | Jul 2024 – Oct 2024 | below 0.001 µg/l 8 Oct 2024 |
| Perfluorooctadecanoic acid 2962 | River water | 2 | Jul 2024 – Oct 2024 | below 0.002 µg/l 8 Oct 2024 |
| Perfluorooctanesulfonamide 2961 | River water | 2 | Jul 2024 – Oct 2024 | below 0.001 µg/l 8 Oct 2024 |
| Perfluorooctanesulfonic acid (branched) 2960 | River water | 2 | Jul 2024 – Oct 2024 | below 0.0005 µg/l 8 Oct 2024 |
| Perfluorooctanesulfonic acid (linear) 2959 | River water | 2 | Jul 2024 – Oct 2024 | below 0.0005 µg/l 8 Oct 2024 |
| Perfluorooctanoic acid 8890 | River water | 2 | Jul 2024 – Oct 2024 | below 0.0005 µg/l 8 Oct 2024 |
| Perfluoropentanesulfonic acid 2957 | River water | 2 | Jul 2024 – Oct 2024 | below 0.0005 µg/l 8 Oct 2024 |
| Perfluoropentanoic acid 8887 | River water | 2 | Jul 2024 – Oct 2024 | below 0.001 µg/l 8 Oct 2024 |
| Perfluorotetradecanoic acid 8895 | River water | 2 | Jul 2024 – Oct 2024 | below 0.006 µg/l 8 Oct 2024 |
| Perfluorotridecanoic acid 2955 | River water | 2 | Jul 2024 – Oct 2024 | below 0.005 µg/l 8 Oct 2024 |
| Perfluoroundecane sulfonic acid 2953 | River water | 2 | Jul 2024 – Oct 2024 | below 0.004 µg/l 8 Oct 2024 |
| Perfluoroundecanoic acid 8893 | River water | 2 | Jul 2024 – Oct 2024 | below 0.002 µg/l 8 Oct 2024 |
| Phosphorus, Total as P 0348 | River water | 21 | Nov 2023 – Mar 2026 | 0.066 mg/l 12 Mar 2026 |
| Silica, reactive as SiO2 0182 | River water | 22 | Nov 2023 – Mar 2026 | 5.5 mg/l 12 Mar 2026 |
| Solids, Suspended at 105 C 0135 | River water | 4 | Dec 2025 – Mar 2026 | 9.7 mg/l 12 Mar 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.