St Lawrence Stream upstream of Pendewey Bridge
EA name: ST. LAWRENCE STREAM U/S PENDEWEY BRIDGE (also listed as “ST. LAWRENCE STREAM ABOVE PENDEWEY BRIDGE”)
Environment Agency sampling point SW-82521220 · 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, 10:0927 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 30 since 13 Oct 2023 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 204504, 66999As published, to the nearest 1 m. Open in a map
- River, by its own name
- St Lawrence Stream
- River, by the map
- An unnamed streamPlaced by position alone (the only river line close by), 13 m from the line.
- Next gauge downstream
- None tracedIts water reaches the sea without passing a gauge.
- Why it was sampled
- Planned investigation (local monitoring) (30 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
94.1%
Sampled 4 Sep 2026, 27 days ago · 30 results banked
Every result (30)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 10:09 | 94.1 | 94.1% |
| 14 Aug 2026, 10:58 | 94.1 | 94.1% |
| 3 Jul 2026, 09:31 | 94.8 | 94.8% |
| 15 Jun 2026, 12:08 | 96.2 | 96.2% |
| 13 May 2026, 10:53 | 95.4 | 95.4% |
| 10 Apr 2026, 14:45 | 98.7 | 98.7% |
| 9 Mar 2026, 12:27 | 99.1 | 99.1% |
| 4 Feb 2026, 14:21 | 99 | 99% |
| 2 Jan 2026, 14:46 | 98.5 | 98.5% |
| 9 Dec 2025, 12:32 | 99.1 | 99.1% |
| 3 Nov 2025, 08:36 | 93.5 | 93.5% |
| 6 Oct 2025, 09:07 | 90.2 | 90.2% |
| 1 Apr 2025, 09:56 | 101.5 | 101.5% |
| 17 Mar 2025, 12:21 | 99.5 | 99.5% |
| 3 Feb 2025, 09:58 | 99.3 | 99.3% |
| 2 Jan 2025, 10:56 | 97 | 97% |
| 4 Dec 2024, 14:39 | 100 | 100% |
| 4 Nov 2024, 09:52 | 99.2 | 99.2% |
| 2 Oct 2024, 15:21 | 99.5 | 99.5% |
| 3 Sep 2024, 12:13 | 95.8 | 95.8% |
| 28 Aug 2024, 10:02 | 94.7 | 94.7% |
| 13 Aug 2024, 10:20 | 96 | 96% |
| 3 Jul 2024, 15:48 | 98 | 98% |
| 5 Jun 2024, 13:58 | 96.3 | 96.3% |
| 7 Mar 2024, 14:36 | 97.8 | 97.8% |
| 1 Feb 2024, 10:38 | 94.6 | 94.6% |
| 15 Jan 2024, 10:56 | 97.6 | 97.6% |
| 1 Dec 2023, 15:06 | 94.8 | 94.8% |
| 8 Nov 2023, 16:38 | 96.8 | 96.8% |
| 13 Oct 2023, 13:57 | 94.2 | 94.2% |
Dissolved oxygen
as O2 · code 9924 · mg/l
9.03 mg/l
Sampled 4 Sep 2026, 27 days ago · 30 results banked
Every result (30)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 10:09 | 9.03 | 9.03 mg/l |
| 14 Aug 2026, 10:58 | 8.89 | 8.89 mg/l |
| 3 Jul 2026, 09:31 | 9.81 | 9.81 mg/l |
| 15 Jun 2026, 12:08 | 9.87 | 9.87 mg/l |
| 13 May 2026, 10:53 | 10.4 | 10.4 mg/l |
| 10 Apr 2026, 14:45 | 11 | 11 mg/l |
| 9 Mar 2026, 12:27 | 10.7 | 10.7 mg/l |
| 4 Feb 2026, 14:21 | 11.1 | 11.1 mg/l |
| 2 Jan 2026, 14:46 | 11.4 | 11.4 mg/l |
| 9 Dec 2025, 12:32 | 10.6 | 10.6 mg/l |
| 3 Nov 2025, 08:36 | 9.99 | 9.99 mg/l |
| 6 Oct 2025, 09:07 | 9.63 | 9.63 mg/l |
| 1 Apr 2025, 09:56 | 11.5 | 11.5 mg/l |
| 17 Mar 2025, 12:21 | 11.6 | 11.6 mg/l |
| 3 Feb 2025, 09:58 | 11.3 | 11.3 mg/l |
| 2 Jan 2025, 10:56 | 11.4 | 11.4 mg/l |
| 4 Dec 2024, 14:39 | 11 | 11 mg/l |
| 4 Nov 2024, 09:52 | 10.6 | 10.6 mg/l |
| 2 Oct 2024, 15:21 | 10.4 | 10.4 mg/l |
| 3 Sep 2024, 12:13 | 9.57 | 9.57 mg/l |
| 28 Aug 2024, 10:02 | 9.4 | 9.4 mg/l |
| 13 Aug 2024, 10:20 | 9.63 | 9.63 mg/l |
| 3 Jul 2024, 15:48 | 9.96 | 9.96 mg/l |
| 5 Jun 2024, 13:58 | 10.2 | 10.2 mg/l |
| 7 Mar 2024, 14:36 | 10.8 | 10.8 mg/l |
| 1 Feb 2024, 10:38 | 10.8 | 10.8 mg/l |
| 15 Jan 2024, 10:56 | 11.4 | 11.4 mg/l |
| 1 Dec 2023, 15:06 | 11.1 | 11.1 mg/l |
| 8 Nov 2023, 16:38 | 10.5 | 10.5 mg/l |
| 13 Oct 2023, 13:57 | 9.31 | 9.31 mg/l |
Water temperature
code 0076 · °C
17.2 °C
Sampled 4 Sep 2026, 27 days ago · 30 results banked
Every result (30)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 10:09 | 17.2 | 17.2 °C |
| 14 Aug 2026, 10:58 | 18 | 18 °C |
| 3 Jul 2026, 09:31 | 13.7 | 13.7 °C |
| 15 Jun 2026, 12:08 | 14.1 | 14.1 °C |
| 13 May 2026, 10:53 | 11.2 | 11.2 °C |
| 10 Apr 2026, 14:45 | 10.3 | 10.3 °C |
| 9 Mar 2026, 12:27 | 11.7 | 11.7 °C |
| 4 Feb 2026, 14:21 | 10.3 | 10.3 °C |
| 2 Jan 2026, 14:46 | 8.7 | 8.7 °C |
| 9 Dec 2025, 12:32 | 12.3 | 12.3 °C |
| 3 Nov 2025, 08:36 | 12.3 | 12.3 °C |
| 6 Oct 2025, 09:07 | 12.3 | 12.3 °C |
| 1 Apr 2025, 09:56 | 9.6 | 9.6 °C |
| 17 Mar 2025, 12:21 | 8.6 | 8.6 °C |
| 3 Feb 2025, 09:58 | 9.4 | 9.4 °C |
| 2 Jan 2025, 10:56 | 8.4 | 8.4 °C |
| 4 Dec 2024, 14:39 | 11.1 | 11.1 °C |
| 4 Nov 2024, 09:52 | 12.2 | 12.2 °C |
| 2 Oct 2024, 15:21 | 13.1 | 13.1 °C |
| 3 Sep 2024, 12:13 | 15.3 | 15.3 °C |
| 28 Aug 2024, 10:02 | 15.6 | 15.6 °C |
| 13 Aug 2024, 10:20 | 15.1 | 15.1 °C |
| 3 Jul 2024, 15:48 | 14.5 | 14.5 °C |
| 5 Jun 2024, 13:58 | 12.7 | 12.7 °C |
| 7 Mar 2024, 14:36 | 11 | 11 °C |
| 1 Feb 2024, 10:38 | 9.4 | 9.4 °C |
| 15 Jan 2024, 10:56 | 8.4 | 8.4 °C |
| 1 Dec 2023, 15:06 | 8.5 | 8.5 °C |
| 8 Nov 2023, 16:38 | 11.8 | 11.8 °C |
| 13 Oct 2023, 13:57 | 15.8 | 15.8 °C |
pH
code 0061
7.74
Sampled 4 Sep 2026, 27 days ago · 30 results banked
Every result (30)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 10:09 | 7.74 | 7.74 |
| 14 Aug 2026, 10:58 | 7.48 | 7.48 |
| 3 Jul 2026, 09:31 | 7.39 | 7.39 |
| 15 Jun 2026, 12:08 | 7.54 | 7.54 |
| 13 May 2026, 10:53 | 7.3 | 7.3 |
| 10 Apr 2026, 14:45 | 7.28 | 7.28 |
| 9 Mar 2026, 12:27 | 7.24 | 7.24 |
| 4 Feb 2026, 14:21 | 7.49 | 7.49 |
| 2 Jan 2026, 14:46 | 7.22 | 7.22 |
| 9 Dec 2025, 12:32 | 7.06 | 7.06 |
| 3 Nov 2025, 08:36 | 7.36 | 7.36 |
| 6 Oct 2025, 09:07 | 7.27 | 7.27 |
| 1 Apr 2025, 09:56 | 7.58 | 7.58 |
| 17 Mar 2025, 12:21 | 7.42 | 7.42 |
| 3 Feb 2025, 09:58 | 7.27 | 7.27 |
| 2 Jan 2025, 10:56 | 7.3 | 7.3 |
| 4 Dec 2024, 14:39 | 7.22 | 7.22 |
| 4 Nov 2024, 09:52 | 7.31 | 7.31 |
| 2 Oct 2024, 15:21 | 7.33 | 7.33 |
| 3 Sep 2024, 12:13 | 7.47 | 7.47 |
| 28 Aug 2024, 10:02 | 7.34 | 7.34 |
| 13 Aug 2024, 10:20 | 7.86 | 7.86 |
| 3 Jul 2024, 15:48 | 7.51 | 7.51 |
| 5 Jun 2024, 13:58 | 7.5 | 7.5 |
| 7 Mar 2024, 14:36 | 7.12 | 7.12 |
| 1 Feb 2024, 10:38 | 7.5 | 7.5 |
| 15 Jan 2024, 10:56 | 7.29 | 7.29 |
| 1 Dec 2023, 15:06 | 7.14 | 7.14 |
| 8 Nov 2023, 16:38 | 6.9 | 6.9 |
| 13 Oct 2023, 13:57 | 7.29 | 7.29 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 14 Aug 2026, 48 days ago · 29 results banked
Every result (29)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Aug 2026, 10:58 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Jul 2026, 09:31 | <0.03 | below 0.03 mg/l (not detected above this) |
| 15 Jun 2026, 12:08 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 May 2026, 10:53 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Apr 2026, 14:45 | 0.042 | 0.042 mg/l |
| 9 Mar 2026, 12:27 | 0.046 | 0.046 mg/l |
| 4 Feb 2026, 14:21 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Jan 2026, 14:46 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Dec 2025, 12:32 | 0.099 | 0.099 mg/l |
| 3 Nov 2025, 08:36 | 0.067 | 0.067 mg/l |
| 6 Oct 2025, 09:07 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Apr 2025, 09:56 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Mar 2025, 12:21 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Feb 2025, 09:58 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Jan 2025, 10:56 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Dec 2024, 14:39 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Nov 2024, 09:52 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Oct 2024, 15:21 | 0.033 | 0.033 mg/l |
| 3 Sep 2024, 12:13 | <0.03 | below 0.03 mg/l (not detected above this) |
| 28 Aug 2024, 10:02 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 Aug 2024, 10:20 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Jul 2024, 15:48 | 0.034 | 0.034 mg/l |
| 5 Jun 2024, 13:58 | 0.032 | 0.032 mg/l |
| 7 Mar 2024, 14:36 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Feb 2024, 10:38 | 0.032 | 0.032 mg/l |
| 15 Jan 2024, 10:56 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Dec 2023, 15:06 | 0.036 | 0.036 mg/l |
| 8 Nov 2023, 16:38 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 Oct 2023, 13:57 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
3.5 mg/l
Sampled 14 Aug 2026, 48 days ago · 29 results banked
Every result (29)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Aug 2026, 10:58 | 3.5 | 3.5 mg/l |
| 3 Jul 2026, 09:31 | 3.8 | 3.8 mg/l |
| 15 Jun 2026, 12:08 | 3.69 | 3.69 mg/l |
| 13 May 2026, 10:53 | 4.39 | 4.39 mg/l |
| 10 Apr 2026, 14:45 | 4.69 | 4.69 mg/l |
| 9 Mar 2026, 12:27 | 5.08 | 5.08 mg/l |
| 4 Feb 2026, 14:21 | 4.99 | 4.99 mg/l |
| 2 Jan 2026, 14:46 | 5.19 | 5.19 mg/l |
| 9 Dec 2025, 12:32 | 2.89 | 2.89 mg/l |
| 3 Nov 2025, 08:36 | 3.95 | 3.95 mg/l |
| 6 Oct 2025, 09:07 | 3.2 | 3.2 mg/l |
| 1 Apr 2025, 09:56 | 5 | 5 mg/l |
| 17 Mar 2025, 12:21 | 5.2 | 5.2 mg/l |
| 3 Feb 2025, 09:58 | 5.3 | 5.3 mg/l |
| 2 Jan 2025, 10:56 | 4.29 | 4.29 mg/l |
| 4 Dec 2024, 14:39 | 5.3 | 5.3 mg/l |
| 4 Nov 2024, 09:52 | 5.4 | 5.4 mg/l |
| 2 Oct 2024, 15:21 | 3.7 | 3.7 mg/l |
| 3 Sep 2024, 12:13 | 3.9 | 3.9 mg/l |
| 28 Aug 2024, 10:02 | 3.8 | 3.8 mg/l |
| 13 Aug 2024, 10:20 | 4.2 | 4.2 mg/l |
| 3 Jul 2024, 15:48 | 4.69 | 4.69 mg/l |
| 5 Jun 2024, 13:58 | 4.79 | 4.79 mg/l |
| 7 Mar 2024, 14:36 | 5.4 | 5.4 mg/l |
| 1 Feb 2024, 10:38 | 4.99 | 4.99 mg/l |
| 15 Jan 2024, 10:56 | 5.49 | 5.49 mg/l |
| 1 Dec 2023, 15:06 | 5.59 | 5.59 mg/l |
| 8 Nov 2023, 16:38 | 4.4 | 4.4 mg/l |
| 13 Oct 2023, 13:57 | 3.29 | 3.29 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.021 mg/l
Sampled 3 Jul 2026, 3 months ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Jul 2026, 09:31 | 0.021 | 0.021 mg/l |
| 15 Jun 2026, 12:08 | 0.025 | 0.025 mg/l |
| 13 May 2026, 10:53 | 0.026 | 0.026 mg/l |
| 10 Apr 2026, 14:45 | 0.026 | 0.026 mg/l |
| 9 Mar 2026, 12:27 | 0.025 | 0.025 mg/l |
| 4 Feb 2026, 14:21 | 0.025 | 0.025 mg/l |
| 2 Jan 2026, 14:46 | 0.02 | 0.02 mg/l |
| 9 Dec 2025, 12:32 | 0.056 | 0.056 mg/l |
| 3 Nov 2025, 08:36 | 0.031 | 0.031 mg/l |
| 6 Oct 2025, 09:07 | 0.022 | 0.022 mg/l |
| 1 Apr 2025, 09:56 | <0.01 | below 0.01 mg/l (not detected above this) |
| 17 Mar 2025, 12:21 | 0.014 | 0.014 mg/l |
| 3 Feb 2025, 09:58 | 0.015 | 0.015 mg/l |
| 2 Jan 2025, 10:56 | 0.011 | 0.011 mg/l |
| 4 Dec 2024, 14:39 | 0.013 | 0.013 mg/l |
| 4 Nov 2024, 09:52 | 0.01 | 0.01 mg/l |
| 2 Oct 2024, 15:21 | 0.025 | 0.025 mg/l |
| 3 Sep 2024, 12:13 | 0.027 | 0.027 mg/l |
| 28 Aug 2024, 10:02 | 0.029 | 0.029 mg/l |
| 13 Aug 2024, 10:20 | 0.026 | 0.026 mg/l |
| 3 Jul 2024, 15:48 | 0.023 | 0.023 mg/l |
| 5 Jun 2024, 13:58 | 0.019 | 0.019 mg/l |
| 7 Mar 2024, 14:36 | 0.012 | 0.012 mg/l |
| 1 Feb 2024, 10:38 | 0.021 | 0.021 mg/l |
| 15 Jan 2024, 10:56 | 0.013 | 0.013 mg/l |
| 1 Dec 2023, 15:06 | 0.016 | 0.016 mg/l |
| 8 Nov 2023, 16:38 | 0.015 | 0.015 mg/l |
| 13 Oct 2023, 13:57 | 0.053 | 0.053 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
241 µS/cm
Sampled 4 Sep 2026, 27 days ago · 30 results banked
Every result (30)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 10:09 | 241 | 241 µS/cm |
| 14 Aug 2026, 10:58 | 241 | 241 µS/cm |
| 3 Jul 2026, 09:31 | 242 | 242 µS/cm |
| 15 Jun 2026, 12:08 | 241 | 241 µS/cm |
| 13 May 2026, 10:53 | 242 | 242 µS/cm |
| 10 Apr 2026, 14:45 | 237 | 237 µS/cm |
| 9 Mar 2026, 12:27 | 240 | 240 µS/cm |
| 4 Feb 2026, 14:21 | 231 | 231 µS/cm |
| 2 Jan 2026, 14:46 | 244 | 244 µS/cm |
| 9 Dec 2025, 12:32 | 187 | 187 µS/cm |
| 3 Nov 2025, 08:36 | 244 | 244 µS/cm |
| 6 Oct 2025, 09:07 | 246 | 246 µS/cm |
| 1 Apr 2025, 09:56 | 237 | 237 µS/cm |
| 17 Mar 2025, 12:21 | 237 | 237 µS/cm |
| 3 Feb 2025, 09:58 | 267 | 267 µS/cm |
| 2 Jan 2025, 10:56 | 257 | 257 µS/cm |
| 4 Dec 2024, 14:39 | 236 | 236 µS/cm |
| 4 Nov 2024, 09:52 | 241 | 241 µS/cm |
| 2 Oct 2024, 15:21 | 242 | 242 µS/cm |
| 3 Sep 2024, 12:13 | 242 | 242 µS/cm |
| 28 Aug 2024, 10:02 | 243 | 243 µS/cm |
| 13 Aug 2024, 10:20 | 257 | 257 µS/cm |
| 3 Jul 2024, 15:48 | 246 | 246 µS/cm |
| 5 Jun 2024, 13:58 | 242 | 242 µS/cm |
| 7 Mar 2024, 14:36 | 238 | 238 µS/cm |
| 1 Feb 2024, 10:38 | 303 | 303 µS/cm |
| 15 Jan 2024, 10:56 | 241 | 241 µS/cm |
| 1 Dec 2023, 15:06 | 247 | 247 µS/cm |
| 8 Nov 2023, 16:38 | 229 | 229 µS/cm |
| 13 Oct 2023, 13:57 | 230 | 230 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 | 30 | Oct 2023 – Sep 2026 | 94.1% 4 Sep 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 30 | Oct 2023 – Sep 2026 | 9.03 mg/l 4 Sep 2026 |
| Temperature of Water 0076 | River water | 30 | Oct 2023 – Sep 2026 | 17.2 °C 4 Sep 2026 |
| pH 0061 | River water | 30 | Oct 2023 – Sep 2026 | 7.74 4 Sep 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 29 | Oct 2023 – Aug 2026 | below 0.03 mg/l 14 Aug 2026 |
| Nitrate as N 0117 | River water | 29 | Oct 2023 – Aug 2026 | 3.5 mg/l 14 Aug 2026 |
| Orthophosphate, reactive as P 0180 | River water | 28 | Oct 2023 – Jul 2026 | 0.021 mg/l 3 Jul 2026 |
| Conductivity at 25 C 0077 | River water | 30 | Oct 2023 – Sep 2026 | 241 µS/cm 4 Sep 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 29 | Oct 2023 – Aug 2026 | 34 mg/l 14 Aug 2026 |
| Ammonia un-ionised as N 0119 | River water | 29 | Oct 2023 – Aug 2026 | below 0.0003 mg/l 14 Aug 2026 |
| Nitrite as N 0118 | River water | 29 | Oct 2023 – Aug 2026 | below 0.004 mg/l 14 Aug 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 29 | Oct 2023 – Aug 2026 | 3.5 mg/l 14 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.