Stevenage Brook at Frogmore Hall
EA name: STEVENAGE BROOK AT FROGMORE HALL
Environment Agency sampling point TH-PLER0140 · 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
- 4 Sep 2026, 15:0827 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 28 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 Planned investigation (local monitoring)
- Where
- National Grid 528742, 220355As published, to the nearest 1 m. Open in a map
- River, by its own name
- Stevenage Brook
- River, by the map
- Stevenage BrookPlaced on the river its name gives, 2 m from the line.
- Next gauge downstream
- Hertford, Hartham Park On the River Beane · 12 km along the river
- Nearest gauge upstream
- Bragbury Park On the Stevenage Brook · 1.7 km along the river
- Why it was sampled
- Monitoring (national agency policy) (24 samples)
Planned investigation (local monitoring) (4 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
57.8%
Sampled 4 Sep 2026, 27 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 15:08 | 57.8 | 57.8% |
| 10 Aug 2026, 12:59 | 94 | 94% |
| 2 Jul 2026, 07:47 | 72.7 | 72.7% |
| 4 Jun 2026, 12:59 | 78.4 | 78.4% |
| 6 May 2026, 07:45 | 75.1 | 75.1% |
| 8 Apr 2026, 10:13 | 90.1 | 90.1% |
| 5 Mar 2026, 07:27 | 88.9 | 88.9% |
| 5 Feb 2026, 08:24 | 92.7 | 92.7% |
| 8 Jan 2026, 10:37 | 90.1 | 90.1% |
| 2 Dec 2025, 10:43 | 83.1 | 83.1% |
| 6 Nov 2025, 07:31 | 51.1 | 51.1% |
| 13 Oct 2025, 12:27 | 86 | 86% |
| 3 Sep 2025, 08:02 | 73 | 73% |
| 14 Aug 2025, 07:41 | 68.1 | 68.1% |
| 2 Jul 2025, 10:03 | 75.1 | 75.1% |
| 5 Jun 2025, 11:08 | 76.2 | 76.2% |
| 19 May 2025, 12:08 | 100.4 | 100.4% |
| 24 Apr 2025, 10:00 | 85.9 | 85.9% |
| 13 Mar 2025, 13:39 | 96.5 | 96.5% |
| 4 Feb 2025, 09:26 | 86.7 | 86.7% |
| 21 Jan 2025, 09:39 | 84.1 | 84.1% |
| 4 Dec 2024, 12:01 | 87.7 | 87.7% |
| 18 Nov 2024, 10:24 | 63.7 | 63.7% |
| 14 Oct 2024, 08:22 | 81.9 | 81.9% |
| 17 Sep 2024, 10:40 | 80 | 80% |
| 22 Aug 2024, 11:45 | 78.8 | 78.8% |
| 15 Jul 2024, 12:14 | 84.7 | 84.7% |
| 17 Jun 2024, 07:56 | 76.4 | 76.4% |
Dissolved oxygen
as O2 · code 9924 · mg/l
5.44 mg/l
Sampled 4 Sep 2026, 27 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 15:08 | 5.44 | 5.44 mg/l |
| 10 Aug 2026, 12:59 | 8.88 | 8.88 mg/l |
| 2 Jul 2026, 07:47 | 6.99 | 6.99 mg/l |
| 4 Jun 2026, 12:59 | 7.9 | 7.9 mg/l |
| 6 May 2026, 07:45 | 8.42 | 8.42 mg/l |
| 8 Apr 2026, 10:13 | 10.2 | 10.2 mg/l |
| 5 Mar 2026, 07:27 | 10.6 | 10.6 mg/l |
| 5 Feb 2026, 08:24 | 11.3 | 11.3 mg/l |
| 8 Jan 2026, 10:37 | 11.8 | 11.8 mg/l |
| 2 Dec 2025, 10:43 | 9.66 | 9.66 mg/l |
| 6 Nov 2025, 07:31 | 5.44 | 5.44 mg/l |
| 13 Oct 2025, 12:27 | 9.16 | 9.16 mg/l |
| 3 Sep 2025, 08:02 | 7.13 | 7.13 mg/l |
| 14 Aug 2025, 07:41 | 6.54 | 6.54 mg/l |
| 2 Jul 2025, 10:03 | 7.3 | 7.3 mg/l |
| 5 Jun 2025, 11:08 | 7.97 | 7.97 mg/l |
| 19 May 2025, 12:08 | 10.7 | 10.7 mg/l |
| 24 Apr 2025, 10:00 | 9.61 | 9.61 mg/l |
| 13 Mar 2025, 13:39 | 11 | 11 mg/l |
| 4 Feb 2025, 09:26 | 10.5 | 10.5 mg/l |
| 21 Jan 2025, 09:39 | 10.5 | 10.5 mg/l |
| 4 Dec 2024, 12:01 | 10.3 | 10.3 mg/l |
| 18 Nov 2024, 10:24 | 7.39 | 7.39 mg/l |
| 14 Oct 2024, 08:22 | 9.23 | 9.23 mg/l |
| 17 Sep 2024, 10:40 | 8.64 | 8.64 mg/l |
| 22 Aug 2024, 11:45 | 8.05 | 8.05 mg/l |
| 15 Jul 2024, 12:14 | 8.71 | 8.71 mg/l |
| 17 Jun 2024, 07:56 | 8.14 | 8.14 mg/l |
Water temperature
code 0076 · °C
18.2 °C
Sampled 4 Sep 2026, 27 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 15:08 | 18.2 | 18.2 °C |
| 10 Aug 2026, 12:59 | 18 | 18 °C |
| 2 Jul 2026, 07:47 | 17.1 | 17.1 °C |
| 4 Jun 2026, 12:59 | 14.9 | 14.9 °C |
| 6 May 2026, 07:45 | 10.2 | 10.2 °C |
| 8 Apr 2026, 10:13 | 9.8 | 9.8 °C |
| 5 Mar 2026, 07:27 | 7.7 | 7.7 °C |
| 5 Feb 2026, 08:24 | 6.7 | 6.7 °C |
| 8 Jan 2026, 10:37 | 3.9 | 3.9 °C |
| 2 Dec 2025, 10:43 | 8.7 | 8.7 °C |
| 6 Nov 2025, 07:31 | 12.4 | 12.4 °C |
| 13 Oct 2025, 12:27 | 12.4 | 12.4 °C |
| 3 Sep 2025, 08:02 | 16.4 | 16.4 °C |
| 14 Aug 2025, 07:41 | 17.2 | 17.2 °C |
| 2 Jul 2025, 10:03 | 16.6 | 16.6 °C |
| 5 Jun 2025, 11:08 | 13.2 | 13.2 °C |
| 19 May 2025, 12:08 | 12.5 | 12.5 °C |
| 24 Apr 2025, 10:00 | 10.3 | 10.3 °C |
| 13 Mar 2025, 13:39 | 9.7 | 9.7 °C |
| 4 Feb 2025, 09:26 | 7 | 7 °C |
| 21 Jan 2025, 09:39 | 5.8 | 5.8 °C |
| 4 Dec 2024, 12:01 | 8.4 | 8.4 °C |
| 18 Nov 2024, 10:24 | 8.8 | 8.8 °C |
| 14 Oct 2024, 08:22 | 10 | 10 °C |
| 17 Sep 2024, 10:40 | 11.8 | 11.8 °C |
| 22 Aug 2024, 11:45 | 14.3 | 14.3 °C |
| 15 Jul 2024, 12:14 | 14 | 14 °C |
| 17 Jun 2024, 07:56 | 12.4 | 12.4 °C |
pH
code 0061
7.37
Sampled 4 Sep 2026, 27 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 15:08 | 7.37 | 7.37 |
| 10 Aug 2026, 12:59 | 8.11 | 8.11 |
| 2 Jul 2026, 07:47 | 7.75 | 7.75 |
| 4 Jun 2026, 12:59 | 7.79 | 7.79 |
| 6 May 2026, 07:45 | 7.66 | 7.66 |
| 8 Apr 2026, 10:13 | 7.88 | 7.88 |
| 5 Mar 2026, 07:27 | 7.82 | 7.82 |
| 5 Feb 2026, 08:24 | 8.2 | 8.2 |
| 8 Jan 2026, 10:37 | 7.98 | 7.98 |
| 2 Dec 2025, 10:43 | 7.72 | 7.72 |
| 6 Nov 2025, 07:31 | 7.61 | 7.61 |
| 13 Oct 2025, 12:27 | 7.81 | 7.81 |
| 3 Sep 2025, 08:02 | 7.96 | 7.96 |
| 14 Aug 2025, 07:41 | 7.76 | 7.76 |
| 2 Jul 2025, 10:03 | 7.69 | 7.69 |
| 5 Jun 2025, 11:08 | 7.6 | 7.6 |
| 19 May 2025, 12:08 | 7.82 | 7.82 |
| 24 Apr 2025, 10:00 | 7.56 | 7.56 |
| 13 Mar 2025, 13:39 | 7.81 | 7.81 |
| 4 Feb 2025, 09:26 | 7.72 | 7.72 |
| 21 Jan 2025, 09:39 | 7.67 | 7.67 |
| 4 Dec 2024, 12:01 | 7.68 | 7.68 |
| 18 Nov 2024, 10:24 | 7.53 | 7.53 |
| 14 Oct 2024, 08:22 | 7.76 | 7.76 |
| 17 Sep 2024, 10:40 | 7.58 | 7.58 |
| 22 Aug 2024, 11:45 | 7.79 | 7.79 |
| 15 Jul 2024, 12:14 | 7.78 | 7.78 |
| 17 Jun 2024, 07:56 | 7.56 | 7.56 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.8 mg/l
Sampled 4 Sep 2026, 27 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 15:08 | 0.8 | 0.8 mg/l |
| 10 Aug 2026, 12:59 | 0.084 | 0.084 mg/l |
| 2 Jul 2026, 07:47 | 0.083 | 0.083 mg/l |
| 4 Jun 2026, 12:59 | 0.061 | 0.061 mg/l |
| 6 May 2026, 07:45 | 0.1 | 0.1 mg/l |
| 8 Apr 2026, 10:13 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Mar 2026, 07:27 | 0.081 | 0.081 mg/l |
| 5 Feb 2026, 08:24 | 0.049 | 0.049 mg/l |
| 8 Jan 2026, 10:37 | 0.068 | 0.068 mg/l |
| 2 Dec 2025, 10:43 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 Nov 2025, 07:31 | 0.051 | 0.051 mg/l |
| 13 Oct 2025, 12:27 | 0.046 | 0.046 mg/l |
| 3 Sep 2025, 08:02 | 0.056 | 0.056 mg/l |
| 14 Aug 2025, 07:41 | 0.046 | 0.046 mg/l |
| 2 Jul 2025, 10:03 | 0.11 | 0.11 mg/l |
| 5 Jun 2025, 11:08 | 0.036 | 0.036 mg/l |
| 19 May 2025, 12:08 | <0.03 | below 0.03 mg/l (not detected above this) |
| 24 Apr 2025, 10:00 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 Mar 2025, 13:39 | 0.05 | 0.05 mg/l |
| 4 Feb 2025, 09:26 | 0.05 | 0.05 mg/l |
| 21 Jan 2025, 09:39 | 0.044 | 0.044 mg/l |
| 4 Dec 2024, 12:01 | 0.054 | 0.054 mg/l |
| 18 Nov 2024, 10:24 | 0.35 | 0.35 mg/l |
| 14 Oct 2024, 08:22 | 0.03 | 0.03 mg/l |
| 17 Sep 2024, 10:40 | 0.058 | 0.058 mg/l |
| 22 Aug 2024, 11:45 | <0.03 | below 0.03 mg/l (not detected above this) |
| 15 Jul 2024, 12:14 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Jun 2024, 07:56 | 0.049 | 0.049 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
1.65 mg/l
Sampled 4 Sep 2026, 27 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 15:08 | 1.65 | 1.65 mg/l |
| 10 Aug 2026, 12:59 | 0.537 | 0.537 mg/l |
| 2 Jul 2026, 07:47 | 3.34 | 3.34 mg/l |
| 4 Jun 2026, 12:59 | 1.67 | 1.67 mg/l |
| 6 May 2026, 07:45 | 3.96 | 3.96 mg/l |
| 8 Apr 2026, 10:13 | 4.38 | 4.38 mg/l |
| 5 Mar 2026, 07:27 | 4.78 | 4.78 mg/l |
| 5 Feb 2026, 08:24 | 4.38 | 4.38 mg/l |
| 8 Jan 2026, 10:37 | 3.07 | 3.07 mg/l |
| 2 Dec 2025, 10:43 | 2.18 | 2.18 mg/l |
| 6 Nov 2025, 07:31 | 0.506 | 0.506 mg/l |
| 13 Oct 2025, 12:27 | 3.27 | 3.27 mg/l |
| 3 Sep 2025, 08:02 | 0.866 | 0.866 mg/l |
| 14 Aug 2025, 07:41 | 3.46 | 3.46 mg/l |
| 2 Jul 2025, 10:03 | 3.44 | 3.44 mg/l |
| 5 Jun 2025, 11:08 | 2.96 | 2.96 mg/l |
| 19 May 2025, 12:08 | 4.36 | 4.36 mg/l |
| 24 Apr 2025, 10:00 | 3.58 | 3.58 mg/l |
| 13 Mar 2025, 13:39 | 4.98 | 4.98 mg/l |
| 4 Feb 2025, 09:26 | 4.79 | 4.79 mg/l |
| 21 Jan 2025, 09:39 | 5.29 | 5.29 mg/l |
| 18 Nov 2024, 10:24 | 2.89 | 2.89 mg/l |
| 14 Oct 2024, 08:22 | 3.98 | 3.98 mg/l |
| 17 Sep 2024, 10:40 | 3.47 | 3.47 mg/l |
| 22 Aug 2024, 11:45 | 4.75 | 4.75 mg/l |
| 15 Jul 2024, 12:14 | 4.67 | 4.67 mg/l |
| 17 Jun 2024, 07:56 | 3.07 | 3.07 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.13 mg/l
Sampled 4 Sep 2026, 27 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 15:08 | 0.13 | 0.13 mg/l |
| 10 Aug 2026, 12:59 | 0.1 | 0.1 mg/l |
| 2 Jul 2026, 07:47 | 0.11 | 0.11 mg/l |
| 4 Jun 2026, 12:59 | 0.093 | 0.093 mg/l |
| 6 May 2026, 07:45 | 0.059 | 0.059 mg/l |
| 8 Apr 2026, 10:13 | 0.051 | 0.051 mg/l |
| 5 Mar 2026, 07:27 | 0.072 | 0.072 mg/l |
| 5 Feb 2026, 08:24 | 0.082 | 0.082 mg/l |
| 8 Jan 2026, 10:37 | 0.067 | 0.067 mg/l |
| 2 Dec 2025, 10:43 | 0.063 | 0.063 mg/l |
| 6 Nov 2025, 07:31 | 0.12 | 0.12 mg/l |
| 13 Oct 2025, 12:27 | 0.11 | 0.11 mg/l |
| 3 Sep 2025, 08:02 | 0.076 | 0.076 mg/l |
| 14 Aug 2025, 07:41 | 0.097 | 0.097 mg/l |
| 2 Jul 2025, 10:03 | 0.12 | 0.12 mg/l |
| 5 Jun 2025, 11:08 | 0.075 | 0.075 mg/l |
| 19 May 2025, 12:08 | 0.064 | 0.064 mg/l |
| 24 Apr 2025, 10:00 | 0.056 | 0.056 mg/l |
| 13 Mar 2025, 13:39 | 0.048 | 0.048 mg/l |
| 4 Feb 2025, 09:26 | 0.092 | 0.092 mg/l |
| 21 Jan 2025, 09:39 | 0.084 | 0.084 mg/l |
| 4 Dec 2024, 12:01 | 0.064 | 0.064 mg/l |
| 18 Nov 2024, 10:24 | 0.093 | 0.093 mg/l |
| 14 Oct 2024, 08:22 | 0.068 | 0.068 mg/l |
| 17 Sep 2024, 10:40 | 0.075 | 0.075 mg/l |
| 22 Aug 2024, 11:45 | 0.099 | 0.099 mg/l |
| 15 Jul 2024, 12:14 | 0.08 | 0.08 mg/l |
| 17 Jun 2024, 07:56 | 0.064 | 0.064 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
370 µS/cm
Sampled 4 Sep 2026, 27 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 15:08 | 370 | 370 µS/cm |
| 10 Aug 2026, 12:59 | 778 | 778 µS/cm |
| 2 Jul 2026, 07:47 | 711 | 711 µS/cm |
| 4 Jun 2026, 12:59 | 345 | 345 µS/cm |
| 6 May 2026, 07:45 | 617 | 617 µS/cm |
| 8 Apr 2026, 10:13 | 729 | 729 µS/cm |
| 5 Mar 2026, 07:27 | 745 | 745 µS/cm |
| 5 Feb 2026, 08:24 | 664 | 664 µS/cm |
| 8 Jan 2026, 10:37 | 1571 | 1571 µS/cm |
| 2 Dec 2025, 10:43 | 678 | 678 µS/cm |
| 6 Nov 2025, 07:31 | 636 | 636 µS/cm |
| 13 Oct 2025, 12:27 | 783 | 783 µS/cm |
| 3 Sep 2025, 08:02 | 247 | 247 µS/cm |
| 14 Aug 2025, 07:41 | 721 | 721 µS/cm |
| 2 Jul 2025, 10:03 | 663 | 663 µS/cm |
| 5 Jun 2025, 11:08 | 591 | 591 µS/cm |
| 19 May 2025, 12:08 | 699 | 699 µS/cm |
| 24 Apr 2025, 10:00 | 619 | 619 µS/cm |
| 13 Mar 2025, 13:39 | 781 | 781 µS/cm |
| 4 Feb 2025, 09:26 | 795 | 795 µS/cm |
| 21 Jan 2025, 09:39 | 766 | 766 µS/cm |
| 4 Dec 2024, 12:01 | 778 | 778 µS/cm |
| 18 Nov 2024, 10:24 | 569 | 569 µS/cm |
| 14 Oct 2024, 08:22 | 597 | 597 µS/cm |
| 17 Sep 2024, 10:40 | 579 | 579 µS/cm |
| 22 Aug 2024, 11:45 | 715 | 715 µS/cm |
| 15 Jul 2024, 12:14 | 721 | 721 µS/cm |
| 17 Jun 2024, 07:56 | 499 | 499 µS/cm |
Everything measured here
57 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 57 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 28 | Jun 2024 – Sep 2026 | 57.8% 4 Sep 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 28 | Jun 2024 – Sep 2026 | 5.44 mg/l 4 Sep 2026 |
| Temperature of Water 0076 | River water | 28 | Jun 2024 – Sep 2026 | 18.2 °C 4 Sep 2026 |
| pH 0061 | River water | 28 | Jun 2024 – Sep 2026 | 7.37 4 Sep 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 28 | Jun 2024 – Sep 2026 | 0.8 mg/l 4 Sep 2026 |
| Nitrate as N 0117 | River water | 27 | Jun 2024 – Sep 2026 | 1.65 mg/l 4 Sep 2026 |
| Orthophosphate, reactive as P 0180 | River water | 28 | Jun 2024 – Sep 2026 | 0.13 mg/l 4 Sep 2026 |
| Conductivity at 25 C 0077 | River water | 28 | Jun 2024 – Sep 2026 | 370 µS/cm 4 Sep 2026 |
| 11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (F-53B Minor) 2993 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 4 Dec 2024 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (B) 2942 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 4 Dec 2024 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (L) 2991 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 4 Dec 2024 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (B) 2943 | River water | 1 | Dec 2024 – Dec 2024 | below 0.002 µg/l 4 Dec 2024 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (L) 2990 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 4 Dec 2024 |
| 2H,2H,3H,3H-Perfluorooctanoic acid 2989 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 4 Dec 2024 |
| 3-Perfluoroheptylpropanoic acid 2925 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 4 Dec 2024 |
| 3:3 Fluorotelomer carboxylic acid 2926 | River water | 1 | Dec 2024 – Dec 2024 | below 0.004 µg/l 4 Dec 2024 |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) 2988 | River water | 1 | Dec 2024 – Dec 2024 | below 0.005 µg/l 4 Dec 2024 |
| 4:2 Fluorotelomer sulfonic acid 2987 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 4 Dec 2024 |
| 6:2 Fluorotelomer sulfonic acid 2984 | River water | 1 | Dec 2024 – Dec 2024 | 0.0017 µg/l 4 Dec 2024 |
| 8:2 Fluorotelomer sulfonic acid 2983 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 4 Dec 2024 |
| 9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid 2982 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 4 Dec 2024 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 28 | Jun 2024 – Sep 2026 | 110 mg/l 4 Sep 2026 |
| Ammonia un-ionised as N 0119 | River water | 28 | Jun 2024 – Sep 2026 | 0.00637 mg/l 4 Sep 2026 |
| BOD : 5 Day ATU 0085 | River water | 23 | Jun 2024 – May 2026 | 1.1 mg/l 6 May 2026 |
| Hexafluoropropylene oxide dimer acid (Gen X) 2981 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 4 Dec 2024 |
| N-Ethylperfluorooctanesulfonamide 2977 | River water | 1 | Dec 2024 – Dec 2024 | below 0.002 µg/l 4 Dec 2024 |
| N-methylperfluorooctanesulfonamide 2975 | River water | 1 | Dec 2024 – Dec 2024 | below 0.002 µg/l 4 Dec 2024 |
| Nitrite as N 0118 | River water | 28 | Jun 2024 – Sep 2026 | 0.15 mg/l 4 Sep 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 27 | Jun 2024 – Sep 2026 | 1.8 mg/l 4 Sep 2026 |
| Perfluoro(2-ethoxyethane)sulfonic acid 2924 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 4 Dec 2024 |
| Perfluoro(4-methoxybutanoic) acid 2923 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 4 Dec 2024 |
| Perfluoro-3,6-dioxaheptanoic acid 2922 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 4 Dec 2024 |
| Perfluoro-3-methoxypropanoic acid 2921 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 4 Dec 2024 |
| Perfluoro-4-ethylcyclohexanesulfonic acid 2973 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 4 Dec 2024 |
| Perfluorobutanesulfonic acid 2972 | River water | 1 | Dec 2024 – Dec 2024 | 0.0041 µg/l 4 Dec 2024 |
| Perfluorobutanoic acid 2995 | River water | 1 | Dec 2024 – Dec 2024 | 0.004 µg/l 4 Dec 2024 |
| Perfluorobutylsulfonamide (perfluorobutane sulfonamide) 2970 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 4 Dec 2024 |
| Perfluorodecanesulfonic acid 2969 | River water | 1 | Dec 2024 – Dec 2024 | below 0.002 µg/l 4 Dec 2024 |
| Perfluorodecanoic acid 8892 | River water | 1 | Dec 2024 – Dec 2024 | below 0.002 µg/l 4 Dec 2024 |
| Perfluorododecane sulfonic acid 2968 | River water | 1 | Dec 2024 – Dec 2024 | below 0.005 µg/l 4 Dec 2024 |
| Perfluorododecanoic acid 8894 | River water | 1 | Dec 2024 – Dec 2024 | below 0.002 µg/l 4 Dec 2024 |
| Perfluoroheptanoic acid 8889 | River water | 1 | Dec 2024 – Dec 2024 | 0.0028 µg/l 4 Dec 2024 |
| Perfluorohexanesulfonamide 2965 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 4 Dec 2024 |
| Perfluorohexanesulfonic acid (B) 2944 | River water | 1 | Dec 2024 – Dec 2024 | 0.0006 µg/l 4 Dec 2024 |
| Perfluorohexanoic acid 8888 | River water | 1 | Dec 2024 – Dec 2024 | 0.0038 µg/l 4 Dec 2024 |
| Perfluorononanesulfonic acid 2963 | River water | 1 | Dec 2024 – Dec 2024 | 0.0005 µg/l 4 Dec 2024 |
| Perfluorononanoic acid 8891 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 4 Dec 2024 |
| Perfluorooctadecanoic acid 2962 | River water | 1 | Dec 2024 – Dec 2024 | below 0.002 µg/l 4 Dec 2024 |
| Perfluorooctanesulfonamide 2961 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 4 Dec 2024 |
| Perfluorooctanesulfonic acid (branched) 2960 | River water | 1 | Dec 2024 – Dec 2024 | 0.0023 µg/l 4 Dec 2024 |
| Perfluorooctanesulfonic acid (linear) 2959 | River water | 1 | Dec 2024 – Dec 2024 | 0.0033 µg/l 4 Dec 2024 |
| Perfluorooctanoic acid 8890 | River water | 1 | Dec 2024 – Dec 2024 | 0.0029 µg/l 4 Dec 2024 |
| Perfluoropentanesulfonic acid 2957 | River water | 1 | Dec 2024 – Dec 2024 | 0.0013 µg/l 4 Dec 2024 |
| Perfluorotetradecanoic acid 8895 | River water | 1 | Dec 2024 – Dec 2024 | below 0.006 µg/l 4 Dec 2024 |
| Perfluorotridecanoic acid 2955 | River water | 1 | Dec 2024 – Dec 2024 | below 0.005 µg/l 4 Dec 2024 |
| Perfluoroundecane sulfonic acid 2953 | River water | 1 | Dec 2024 – Dec 2024 | below 0.004 µg/l 4 Dec 2024 |
| Perfluoroundecanoic acid 8893 | River water | 1 | Dec 2024 – Dec 2024 | below 0.002 µg/l 4 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.