Dunwich River Walberswick NNR
EA name: DUNWICH R. WALBERSWICK NNR (also listed as “DUNWICH R. WESTWOOD MARSHES WALBERSWICK NNR”)
Environment Agency sampling point AN-DUN020 · 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
- 5 Aug 2026, 11:1757 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 26 since 18 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 647104, 273511As 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
- Not placedTwo watercourses within reach (1 m and 65 m) and no name to choose by. The river map cannot say which watercourse this is.
- Next gauge downstream
- Not known
- Why it was sampled
- Planned investigation (local monitoring) (26 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
45.9%
Sampled 5 Aug 2026, 57 days ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Aug 2026, 11:17 | 45.9 | 45.9% |
| 2 Jun 2026, 10:09 | 44.1 | 44.1% |
| 21 May 2026, 11:13 | 68.5 | 68.5% |
| 30 Apr 2026, 09:24 | 57.5 | 57.5% |
| 26 Mar 2026, 09:41 | 48.7 | 48.7% |
| 11 Feb 2026, 10:09 | 39.5 | 39.5% |
| 28 Jan 2026, 10:46 | 47.6 | 47.6% |
| 2 Dec 2025, 11:00 | 31.6 | 31.6% |
| 11 Nov 2025, 10:25 | 32.9 | 32.9% |
| 9 Oct 2025, 09:23 | 42.1 | 42.1% |
| 3 Sep 2025, 12:16 | 43.5 | 43.5% |
| 13 Aug 2025, 08:49 | 21.8 | 21.8% |
| 23 Jul 2025, 09:08 | 26.5 | 26.5% |
| 24 Jun 2025, 12:05 | 43 | 43% |
| 29 May 2025, 13:27 | 93.6 | 93.6% |
| 24 Apr 2025, 11:56 | 85.2 | 85.2% |
| 18 Mar 2025, 11:44 | 57.4 | 57.4% |
| 25 Feb 2025, 11:10 | 42.8 | 42.8% |
| 30 Jan 2025, 11:09 | 56.5 | 56.5% |
| 29 Nov 2024, 11:52 | 45.5 | 45.5% |
| 2 Oct 2024, 11:38 | 51.9 | 51.9% |
| 10 Sep 2024, 10:07 | 29.2 | 29.2% |
| 14 Aug 2024, 11:34 | 36.9 | 36.9% |
| 2 Jul 2024, 12:15 | 39.9 | 39.9% |
| 18 Jun 2024, 13:05 | 71 | 71% |
Dissolved oxygen
as O2 · code 9924 · mg/l
4.32 mg/l
Sampled 5 Aug 2026, 57 days ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Aug 2026, 11:17 | 4.32 | 4.32 mg/l |
| 2 Jun 2026, 10:09 | 4.18 | 4.18 mg/l |
| 21 May 2026, 11:13 | 6.71 | 6.71 mg/l |
| 30 Apr 2026, 09:24 | 6.3 | 6.3 mg/l |
| 26 Mar 2026, 09:41 | 5.84 | 5.84 mg/l |
| 11 Feb 2026, 10:09 | 4.58 | 4.58 mg/l |
| 28 Jan 2026, 10:46 | 6.13 | 6.13 mg/l |
| 2 Dec 2025, 11:00 | 3.74 | 3.74 mg/l |
| 11 Nov 2025, 10:25 | 3.56 | 3.56 mg/l |
| 9 Oct 2025, 09:23 | 4.72 | 4.72 mg/l |
| 3 Sep 2025, 12:16 | 4.12 | 4.12 mg/l |
| 13 Aug 2025, 08:49 | 2.19 | 2.19 mg/l |
| 23 Jul 2025, 09:08 | 2.47 | 2.47 mg/l |
| 24 Jun 2025, 12:05 | 4.19 | 4.19 mg/l |
| 29 May 2025, 13:27 | 8.61 | 8.61 mg/l |
| 24 Apr 2025, 11:56 | 8.46 | 8.46 mg/l |
| 18 Mar 2025, 11:44 | 6.94 | 6.94 mg/l |
| 25 Feb 2025, 11:10 | 5 | 5 mg/l |
| 30 Jan 2025, 11:09 | 7.13 | 7.13 mg/l |
| 29 Nov 2024, 11:52 | 5.67 | 5.67 mg/l |
| 2 Oct 2024, 11:38 | 5.47 | 5.47 mg/l |
| 10 Sep 2024, 10:07 | 3.02 | 3.02 mg/l |
| 14 Aug 2024, 11:34 | 3.46 | 3.46 mg/l |
| 2 Jul 2024, 12:15 | 4.07 | 4.07 mg/l |
| 18 Jun 2024, 13:05 | 6.48 | 6.48 mg/l |
Water temperature
code 0076 · °C
18.2 °C
Sampled 5 Aug 2026, 57 days ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Aug 2026, 11:17 | 18.2 | 18.2 °C |
| 2 Jun 2026, 10:09 | 17.8 | 17.8 °C |
| 21 May 2026, 11:13 | 16.2 | 16.2 °C |
| 30 Apr 2026, 09:24 | 11.2 | 11.2 °C |
| 26 Mar 2026, 09:41 | 7.4 | 7.4 °C |
| 11 Feb 2026, 10:09 | 8.8 | 8.8 °C |
| 28 Jan 2026, 10:46 | 4.6 | 4.6 °C |
| 2 Dec 2025, 11:00 | 8 | 8 °C |
| 11 Nov 2025, 10:25 | 11.7 | 11.7 °C |
| 9 Oct 2025, 09:23 | 10.2 | 10.2 °C |
| 3 Sep 2025, 12:16 | 17.9 | 17.9 °C |
| 13 Aug 2025, 08:49 | 15 | 15 °C |
| 23 Jul 2025, 09:08 | 18.7 | 18.7 °C |
| 24 Jun 2025, 12:05 | 16.5 | 16.5 °C |
| 29 May 2025, 13:27 | 19.3 | 19.3 °C |
| 24 Apr 2025, 11:56 | 15.6 | 15.6 °C |
| 18 Mar 2025, 11:44 | 7.1 | 7.1 °C |
| 25 Feb 2025, 11:10 | 8.5 | 8.5 °C |
| 30 Jan 2025, 11:09 | 5.4 | 5.4 °C |
| 29 Nov 2024, 11:52 | 5.9 | 5.9 °C |
| 2 Oct 2024, 11:38 | 12.9 | 12.9 °C |
| 10 Sep 2024, 10:07 | 13.8 | 13.8 °C |
| 14 Aug 2024, 11:34 | 18.3 | 18.3 °C |
| 2 Jul 2024, 12:15 | 14.3 | 14.3 °C |
| 18 Jun 2024, 13:05 | 19.7 | 19.7 °C |
pH
code 0061
6.79
Sampled 5 Aug 2026, 57 days ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Aug 2026, 11:17 | 6.79 | 6.79 |
| 2 Jun 2026, 10:09 | 7.28 | 7.28 |
| 21 May 2026, 11:13 | 7.39 | 7.39 |
| 30 Apr 2026, 09:24 | 7.12 | 7.12 |
| 26 Mar 2026, 09:41 | 7.08 | 7.08 |
| 11 Feb 2026, 10:09 | 6.86 | 6.86 |
| 28 Jan 2026, 10:46 | 6.98 | 6.98 |
| 2 Dec 2025, 11:00 | 6.9 | 6.9 |
| 11 Nov 2025, 10:25 | 7.29 | 7.29 |
| 9 Oct 2025, 09:23 | 6.94 | 6.94 |
| 3 Sep 2025, 12:16 | 6.82 | 6.82 |
| 13 Aug 2025, 08:49 | 6.7 | 6.7 |
| 23 Jul 2025, 09:08 | 6.92 | 6.92 |
| 24 Jun 2025, 12:05 | 6.89 | 6.89 |
| 29 May 2025, 13:27 | 7.83 | 7.83 |
| 24 Apr 2025, 11:56 | 7.57 | 7.57 |
| 18 Mar 2025, 11:44 | 7.03 | 7.03 |
| 25 Feb 2025, 11:10 | 7.03 | 7.03 |
| 30 Jan 2025, 11:09 | 7.62 | 7.62 |
| 29 Nov 2024, 11:52 | 6.98 | 6.98 |
| 2 Oct 2024, 11:38 | 6.89 | 6.89 |
| 10 Sep 2024, 10:07 | 6.86 | 6.86 |
| 14 Aug 2024, 11:34 | 6.74 | 6.74 |
| 2 Jul 2024, 12:15 | 7.1 | 7.1 |
| 18 Jun 2024, 13:05 | 7.46 | 7.46 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.11 mg/l
Sampled 5 Aug 2026, 57 days ago · 22 results banked
Every result (22)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Aug 2026, 11:17 | 0.11 | 0.11 mg/l |
| 2 Jun 2026, 10:09 | 0.086 | 0.086 mg/l |
| 21 May 2026, 11:13 | 0.054 | 0.054 mg/l |
| 30 Apr 2026, 09:24 | <0.03 | below 0.03 mg/l (not detected above this) |
| 26 Mar 2026, 09:41 | <0.03 | below 0.03 mg/l (not detected above this) |
| 11 Feb 2026, 10:09 | 0.082 | 0.082 mg/l |
| 28 Jan 2026, 10:46 | 0.072 | 0.072 mg/l |
| 2 Dec 2025, 11:00 | 0.1 | 0.1 mg/l |
| 11 Nov 2025, 10:25 | 0.054 | 0.054 mg/l |
| 9 Oct 2025, 09:23 | 0.051 | 0.051 mg/l |
| 3 Sep 2025, 12:16 | 0.076 | 0.076 mg/l |
| 13 Aug 2025, 08:49 | 0.096 | 0.096 mg/l |
| 24 Apr 2025, 11:56 | <0.03 | below 0.03 mg/l (not detected above this) |
| 18 Mar 2025, 11:44 | <0.03 | below 0.03 mg/l (not detected above this) |
| 25 Feb 2025, 11:10 | <0.03 | below 0.03 mg/l (not detected above this) |
| 30 Jan 2025, 11:09 | <0.03 | below 0.03 mg/l (not detected above this) |
| 29 Nov 2024, 11:52 | 0.04 | 0.04 mg/l |
| 2 Oct 2024, 11:38 | 0.036 | 0.036 mg/l |
| 10 Sep 2024, 10:07 | 0.045 | 0.045 mg/l |
| 14 Aug 2024, 11:34 | 0.066 | 0.066 mg/l |
| 2 Jul 2024, 12:15 | 0.064 | 0.064 mg/l |
| 18 Jun 2024, 13:05 | 0.033 | 0.033 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
3.38 mg/l
Sampled 5 Aug 2026, 57 days ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Aug 2026, 11:17 | 3.38 | 3.38 mg/l |
| 2 Jun 2026, 10:09 | 0.276 | 0.276 mg/l |
| 21 May 2026, 11:13 | 0.276 | 0.276 mg/l |
| 30 Apr 2026, 09:24 | 0.954 | 0.954 mg/l |
| 26 Mar 2026, 09:41 | 0.996 | 0.996 mg/l |
| 11 Feb 2026, 10:09 | 1.37 | 1.37 mg/l |
| 28 Jan 2026, 10:46 | 1.39 | 1.39 mg/l |
| 2 Dec 2025, 11:00 | 1.09 | 1.09 mg/l |
| 11 Nov 2025, 10:25 | 0.877 | 0.877 mg/l |
| 9 Oct 2025, 09:23 | 1.18 | 1.18 mg/l |
| 3 Sep 2025, 12:16 | 1.29 | 1.29 mg/l |
| 13 Aug 2025, 08:49 | 1.58 | 1.58 mg/l |
| 23 Jul 2025, 09:08 | 0.206 | 0.206 mg/l |
| 24 Jun 2025, 12:05 | 0.547 | 0.547 mg/l |
| 29 May 2025, 13:27 | <0.196 | below 0.196 mg/l (not detected above this) |
| 24 Apr 2025, 11:56 | <0.196 | below 0.196 mg/l (not detected above this) |
| 18 Mar 2025, 11:44 | 1.9 | 1.9 mg/l |
| 25 Feb 2025, 11:10 | 1.3 | 1.3 mg/l |
| 30 Jan 2025, 11:09 | 1.49 | 1.49 mg/l |
| 20 Dec 2024, 11:39 | 1.19 | 1.19 mg/l |
| 29 Nov 2024, 11:52 | 1.39 | 1.39 mg/l |
| 2 Oct 2024, 11:38 | 0.842 | 0.842 mg/l |
| 10 Sep 2024, 10:07 | 1.28 | 1.28 mg/l |
| 14 Aug 2024, 11:34 | 1.48 | 1.48 mg/l |
| 2 Jul 2024, 12:15 | 1.49 | 1.49 mg/l |
| 18 Jun 2024, 13:05 | 0.286 | 0.286 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.16 mg/l
Sampled 2 Jun 2026, 4 months ago · 21 results banked
Every result (21)
| Sampled | Result as published | Reads as |
|---|---|---|
| 2 Jun 2026, 10:09 | 0.16 | 0.16 mg/l |
| 21 May 2026, 11:13 | 0.1 | 0.1 mg/l |
| 30 Apr 2026, 09:24 | 0.041 | 0.041 mg/l |
| 26 Mar 2026, 09:41 | 0.044 | 0.044 mg/l |
| 11 Feb 2026, 10:09 | 0.09 | 0.09 mg/l |
| 28 Jan 2026, 10:46 | 0.084 | 0.084 mg/l |
| 2 Dec 2025, 11:00 | 0.065 | 0.065 mg/l |
| 11 Nov 2025, 10:25 | 0.067 | 0.067 mg/l |
| 9 Oct 2025, 09:23 | 0.063 | 0.063 mg/l |
| 3 Sep 2025, 12:16 | 0.076 | 0.076 mg/l |
| 13 Aug 2025, 08:49 | 0.071 | 0.071 mg/l |
| 24 Apr 2025, 11:56 | 0.071 | 0.071 mg/l |
| 18 Mar 2025, 11:44 | 0.038 | 0.038 mg/l |
| 25 Feb 2025, 11:10 | 0.044 | 0.044 mg/l |
| 30 Jan 2025, 11:09 | 0.038 | 0.038 mg/l |
| 29 Nov 2024, 11:52 | 0.047 | 0.047 mg/l |
| 2 Oct 2024, 11:38 | 0.072 | 0.072 mg/l |
| 10 Sep 2024, 10:07 | 0.054 | 0.054 mg/l |
| 14 Aug 2024, 11:34 | 0.046 | 0.046 mg/l |
| 2 Jul 2024, 12:15 | 0.04 | 0.04 mg/l |
| 18 Jun 2024, 13:05 | 0.13 | 0.13 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
526 µS/cm
Sampled 5 Aug 2026, 57 days ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Aug 2026, 11:17 | 526 | 526 µS/cm |
| 2 Jun 2026, 10:09 | 768 | 768 µS/cm |
| 21 May 2026, 11:13 | 646 | 646 µS/cm |
| 30 Apr 2026, 09:24 | 492 | 492 µS/cm |
| 26 Mar 2026, 09:41 | 469 | 469 µS/cm |
| 11 Feb 2026, 10:09 | 381 | 381 µS/cm |
| 28 Jan 2026, 10:46 | 429 | 429 µS/cm |
| 2 Dec 2025, 11:00 | 457 | 457 µS/cm |
| 11 Nov 2025, 10:25 | 621 | 621 µS/cm |
| 9 Oct 2025, 09:23 | 559 | 559 µS/cm |
| 3 Sep 2025, 12:16 | 590 | 590 µS/cm |
| 13 Aug 2025, 08:49 | 556 | 556 µS/cm |
| 23 Jul 2025, 09:08 | 728 | 728 µS/cm |
| 24 Jun 2025, 12:05 | 577 | 577 µS/cm |
| 29 May 2025, 13:27 | 858 | 858 µS/cm |
| 24 Apr 2025, 11:56 | 759 | 759 µS/cm |
| 18 Mar 2025, 11:44 | 477 | 477 µS/cm |
| 25 Feb 2025, 11:10 | 426 | 426 µS/cm |
| 30 Jan 2025, 11:09 | 516 | 516 µS/cm |
| 29 Nov 2024, 11:52 | 389 | 389 µS/cm |
| 2 Oct 2024, 11:38 | 459 | 459 µS/cm |
| 10 Sep 2024, 10:07 | 523 | 523 µS/cm |
| 14 Aug 2024, 11:34 | 527 | 527 µS/cm |
| 2 Jul 2024, 12:15 | 828 | 828 µS/cm |
| 18 Jun 2024, 13:05 | 724 | 724 µS/cm |
Everything measured here
12 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 12 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 25 | Jun 2024 – Aug 2026 | 45.9% 5 Aug 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 25 | Jun 2024 – Aug 2026 | 4.32 mg/l 5 Aug 2026 |
| Temperature of Water 0076 | River water | 25 | Jun 2024 – Aug 2026 | 18.2 °C 5 Aug 2026 |
| pH 0061 | River water | 25 | Jun 2024 – Aug 2026 | 6.79 5 Aug 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 22 | Jun 2024 – Aug 2026 | 0.11 mg/l 5 Aug 2026 |
| Nitrate as N 0117 | River water | 26 | Jun 2024 – Aug 2026 | 3.38 mg/l 5 Aug 2026 |
| Orthophosphate, reactive as P 0180 | River water | 21 | Jun 2024 – Jun 2026 | 0.16 mg/l 2 Jun 2026 |
| Conductivity at 25 C 0077 | River water | 25 | Jun 2024 – Aug 2026 | 526 µS/cm 5 Aug 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 23 | Jun 2024 – Aug 2026 | 130 mg/l 5 Aug 2026 |
| Ammonia un-ionised as N 0119 | River water | 22 | Jun 2024 – Aug 2026 | 0.00023 mg/l 5 Aug 2026 |
| Nitrite as N 0118 | River water | 26 | Jun 2024 – Aug 2026 | 0.025 mg/l 5 Aug 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 26 | Jun 2024 – Aug 2026 | 3.4 mg/l 5 Aug 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.