Porthilly Stream at Footbridge
EA name: PORTHILLY STREAM AT FOOTBRIDGE
Environment Agency sampling point SW-82513621 · 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, 10:315 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
- 23 since 25 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 193721, 75456As published, to the nearest 1 m. Open in a map
- River, by its own name
- Porthilly Stream
- 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 tracedIts water reaches the sea without passing a gauge.
- Why it was sampled
- Monitoring (national agency policy) (23 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
99.8%
Sampled 12 May 2026, 5 months ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 May 2026, 10:31 | 99.8 | 99.8% |
| 23 Apr 2026, 10:50 | 104.6 | 104.6% |
| 17 Mar 2026, 11:57 | 96.3 | 96.3% |
| 17 Feb 2026, 12:12 | 100.3 | 100.3% |
| 30 Jan 2026, 10:40 | 97.7 | 97.7% |
| 28 Mar 2025, 08:54 | 100 | 100% |
| 28 Feb 2025, 10:38 | 93 | 93% |
| 31 Jan 2025, 08:58 | 98.1 | 98.1% |
| 4 Dec 2024, 11:32 | 100 | 100% |
| 28 Nov 2024, 10:50 | 99.8 | 99.8% |
| 21 Oct 2024, 15:48 | 96.5 | 96.5% |
| 17 Sep 2024, 12:48 | 98 | 98% |
| 23 Aug 2024, 11:50 | 98.5 | 98.5% |
| 17 Jul 2024, 13:24 | 102.2 | 102.2% |
| 20 Jun 2024, 10:39 | 103.7 | 103.7% |
| 14 May 2024, 12:36 | 97.9 | 97.9% |
| 17 Apr 2024, 10:33 | 98.3 | 98.3% |
| 22 Mar 2024, 12:41 | 100.1 | 100.1% |
| 20 Feb 2024, 10:18 | 98.8 | 98.8% |
| 15 Jan 2024, 13:00 | 99 | 99% |
| 6 Dec 2023, 11:04 | 96.5 | 96.5% |
| 23 Nov 2023, 11:19 | 97.5 | 97.5% |
| 25 Oct 2023, 15:53 | 99.2 | 99.2% |
Dissolved oxygen
as O2 · code 9924 · mg/l
10.7 mg/l
Sampled 12 May 2026, 5 months ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 May 2026, 10:31 | 10.7 | 10.7 mg/l |
| 23 Apr 2026, 10:50 | 11.3 | 11.3 mg/l |
| 17 Mar 2026, 11:57 | 10.5 | 10.5 mg/l |
| 17 Feb 2026, 12:12 | 11.5 | 11.5 mg/l |
| 30 Jan 2026, 10:40 | 11.1 | 11.1 mg/l |
| 28 Mar 2025, 08:54 | 11.1 | 11.1 mg/l |
| 28 Feb 2025, 10:38 | 10.8 | 10.8 mg/l |
| 31 Jan 2025, 08:58 | 11.2 | 11.2 mg/l |
| 4 Dec 2024, 11:32 | 10.9 | 10.9 mg/l |
| 28 Nov 2024, 10:50 | 11.1 | 11.1 mg/l |
| 21 Oct 2024, 15:48 | 9.9 | 9.9 mg/l |
| 17 Sep 2024, 12:48 | 10.1 | 10.1 mg/l |
| 23 Aug 2024, 11:50 | 9.78 | 9.78 mg/l |
| 17 Jul 2024, 13:24 | 9.91 | 9.91 mg/l |
| 20 Jun 2024, 10:39 | 10.5 | 10.5 mg/l |
| 14 May 2024, 12:36 | 10.2 | 10.2 mg/l |
| 17 Apr 2024, 10:33 | 10.9 | 10.9 mg/l |
| 22 Mar 2024, 12:41 | 10.8 | 10.8 mg/l |
| 20 Feb 2024, 10:18 | 10.8 | 10.8 mg/l |
| 15 Jan 2024, 13:00 | 11.3 | 11.3 mg/l |
| 6 Dec 2023, 11:04 | 10.9 | 10.9 mg/l |
| 23 Nov 2023, 11:19 | 10.4 | 10.4 mg/l |
| 25 Oct 2023, 15:53 | 10.3 | 10.3 mg/l |
Water temperature
code 0076 · °C
12.1 °C
Sampled 12 May 2026, 5 months ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 May 2026, 10:31 | 12.1 | 12.1 °C |
| 23 Apr 2026, 10:50 | 11.9 | 11.9 °C |
| 17 Mar 2026, 11:57 | 11.4 | 11.4 °C |
| 17 Feb 2026, 12:12 | 9.4 | 9.4 °C |
| 30 Jan 2026, 10:40 | 9.6 | 9.6 °C |
| 28 Mar 2025, 08:54 | 10.7 | 10.7 °C |
| 28 Feb 2025, 10:38 | 8.9 | 8.9 °C |
| 31 Jan 2025, 08:58 | 9.4 | 9.4 °C |
| 4 Dec 2024, 11:32 | 11.3 | 11.3 °C |
| 28 Nov 2024, 10:50 | 10.6 | 10.6 °C |
| 21 Oct 2024, 15:48 | 14.1 | 14.1 °C |
| 17 Sep 2024, 12:48 | 14.1 | 14.1 °C |
| 23 Aug 2024, 11:50 | 15.6 | 15.6 °C |
| 17 Jul 2024, 13:24 | 16.7 | 16.7 °C |
| 20 Jun 2024, 10:39 | 14.8 | 14.8 °C |
| 14 May 2024, 12:36 | 13.5 | 13.5 °C |
| 17 Apr 2024, 10:33 | 10.8 | 10.8 °C |
| 22 Mar 2024, 12:41 | 11.8 | 11.8 °C |
| 20 Feb 2024, 10:18 | 11.2 | 11.2 °C |
| 15 Jan 2024, 13:00 | 9.4 | 9.4 °C |
| 6 Dec 2023, 11:04 | 10 | 10 °C |
| 23 Nov 2023, 11:19 | 12.4 | 12.4 °C |
| 25 Oct 2023, 15:53 | 13.4 | 13.4 °C |
pH
code 0061
8.24
Sampled 12 May 2026, 5 months ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 May 2026, 10:31 | 8.24 | 8.24 |
| 23 Apr 2026, 10:50 | 8.2 | 8.2 |
| 17 Mar 2026, 11:57 | 8.18 | 8.18 |
| 17 Feb 2026, 12:12 | 8.01 | 8.01 |
| 30 Jan 2026, 10:40 | 8.1 | 8.1 |
| 28 Mar 2025, 08:54 | 8.24 | 8.24 |
| 28 Feb 2025, 10:38 | 8.11 | 8.11 |
| 31 Jan 2025, 08:58 | 8.15 | 8.15 |
| 4 Dec 2024, 11:32 | 8.05 | 8.05 |
| 28 Nov 2024, 10:50 | 8.07 | 8.07 |
| 21 Oct 2024, 15:48 | 8 | 8 |
| 17 Sep 2024, 12:48 | 8.25 | 8.25 |
| 23 Aug 2024, 11:50 | 8.24 | 8.24 |
| 17 Jul 2024, 13:24 | 8.12 | 8.12 |
| 20 Jun 2024, 10:39 | 8.14 | 8.14 |
| 14 May 2024, 12:36 | 8.18 | 8.18 |
| 17 Apr 2024, 10:33 | 8.17 | 8.17 |
| 22 Mar 2024, 12:41 | 8.07 | 8.07 |
| 20 Feb 2024, 10:18 | 8.13 | 8.13 |
| 15 Jan 2024, 13:00 | 8.09 | 8.09 |
| 6 Dec 2023, 11:04 | 7.91 | 7.91 |
| 23 Nov 2023, 11:19 | 7.85 | 7.85 |
| 25 Oct 2023, 15:53 | 8.28 | 8.28 |
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 · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 May 2026, 10:31 | <0.03 | below 0.03 mg/l (not detected above this) |
| 23 Apr 2026, 10:50 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Mar 2026, 11:57 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Feb 2026, 12:12 | <0.03 | below 0.03 mg/l (not detected above this) |
| 30 Jan 2026, 10:40 | <0.03 | below 0.03 mg/l (not detected above this) |
| 28 Mar 2025, 08:54 | <0.03 | below 0.03 mg/l (not detected above this) |
| 28 Feb 2025, 10:38 | <0.03 | below 0.03 mg/l (not detected above this) |
| 31 Jan 2025, 08:58 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Dec 2024, 11:32 | <0.03 | below 0.03 mg/l (not detected above this) |
| 28 Nov 2024, 10:50 | <0.03 | below 0.03 mg/l (not detected above this) |
| 21 Oct 2024, 15:48 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Sep 2024, 12:48 | 0.08 | 0.08 mg/l |
| 23 Aug 2024, 11:50 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Jul 2024, 13:24 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 Jun 2024, 10:39 | <0.03 | below 0.03 mg/l (not detected above this) |
| 14 May 2024, 12:36 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Apr 2024, 10:33 | <0.03 | below 0.03 mg/l (not detected above this) |
| 22 Mar 2024, 12:41 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 Feb 2024, 10:18 | <0.03 | below 0.03 mg/l (not detected above this) |
| 15 Jan 2024, 13:00 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 Dec 2023, 11:04 | <0.03 | below 0.03 mg/l (not detected above this) |
| 23 Nov 2023, 11:19 | <0.03 | below 0.03 mg/l (not detected above this) |
| 25 Oct 2023, 15:53 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
3.89 mg/l
Sampled 12 May 2026, 5 months ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 May 2026, 10:31 | 3.89 | 3.89 mg/l |
| 23 Apr 2026, 10:50 | 5.19 | 5.19 mg/l |
| 17 Mar 2026, 11:57 | 7.5 | 7.5 mg/l |
| 17 Feb 2026, 12:12 | 7.9 | 7.9 mg/l |
| 30 Jan 2026, 10:40 | 7 | 7 mg/l |
| 28 Mar 2025, 08:54 | 7.09 | 7.09 mg/l |
| 28 Feb 2025, 10:38 | 9.29 | 9.29 mg/l |
| 31 Jan 2025, 08:58 | 9.5 | 9.5 mg/l |
| 4 Dec 2024, 11:32 | 9.39 | 9.39 mg/l |
| 28 Nov 2024, 10:50 | 8.89 | 8.89 mg/l |
| 21 Oct 2024, 15:48 | 7.79 | 7.79 mg/l |
| 17 Sep 2024, 12:48 | 2.29 | 2.29 mg/l |
| 23 Aug 2024, 11:50 | 2.1 | 2.1 mg/l |
| 17 Jul 2024, 13:24 | 3.39 | 3.39 mg/l |
| 20 Jun 2024, 10:39 | 4.88 | 4.88 mg/l |
| 14 May 2024, 12:36 | 6.48 | 6.48 mg/l |
| 17 Apr 2024, 10:33 | 8.69 | 8.69 mg/l |
| 22 Mar 2024, 12:41 | 8.49 | 8.49 mg/l |
| 20 Feb 2024, 10:18 | 9.39 | 9.39 mg/l |
| 15 Jan 2024, 13:00 | 11 | 11 mg/l |
| 6 Dec 2023, 11:04 | 9.99 | 9.99 mg/l |
| 23 Nov 2023, 11:19 | 11 | 11 mg/l |
| 25 Oct 2023, 15:53 | 5.29 | 5.29 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.034 mg/l
Sampled 12 May 2026, 5 months ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 May 2026, 10:31 | 0.034 | 0.034 mg/l |
| 23 Apr 2026, 10:50 | 0.02 | 0.02 mg/l |
| 17 Mar 2026, 11:57 | 0.014 | 0.014 mg/l |
| 17 Feb 2026, 12:12 | 0.018 | 0.018 mg/l |
| 30 Jan 2026, 10:40 | 0.034 | 0.034 mg/l |
| 28 Mar 2025, 08:54 | <0.01 | below 0.01 mg/l (not detected above this) |
| 28 Feb 2025, 10:38 | 0.016 | 0.016 mg/l |
| 31 Jan 2025, 08:58 | 0.014 | 0.014 mg/l |
| 4 Dec 2024, 11:32 | 0.014 | 0.014 mg/l |
| 28 Nov 2024, 10:50 | 0.017 | 0.017 mg/l |
| 21 Oct 2024, 15:48 | 0.026 | 0.026 mg/l |
| 17 Sep 2024, 12:48 | 0.064 | 0.064 mg/l |
| 23 Aug 2024, 11:50 | 0.034 | 0.034 mg/l |
| 17 Jul 2024, 13:24 | 0.021 | 0.021 mg/l |
| 20 Jun 2024, 10:39 | 0.022 | 0.022 mg/l |
| 14 May 2024, 12:36 | 0.025 | 0.025 mg/l |
| 17 Apr 2024, 10:33 | 0.014 | 0.014 mg/l |
| 22 Mar 2024, 12:41 | 0.011 | 0.011 mg/l |
| 20 Feb 2024, 10:18 | 0.026 | 0.026 mg/l |
| 15 Jan 2024, 13:00 | 0.014 | 0.014 mg/l |
| 6 Dec 2023, 11:04 | 0.019 | 0.019 mg/l |
| 23 Nov 2023, 11:19 | 0.018 | 0.018 mg/l |
| 25 Oct 2023, 15:53 | 0.038 | 0.038 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
665 µS/cm
Sampled 12 May 2026, 5 months ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 May 2026, 10:31 | 665 | 665 µS/cm |
| 23 Apr 2026, 10:50 | 680 | 680 µS/cm |
| 17 Mar 2026, 11:57 | 716 | 716 µS/cm |
| 17 Feb 2026, 12:12 | 717 | 717 µS/cm |
| 30 Jan 2026, 10:40 | 655 | 655 µS/cm |
| 28 Mar 2025, 08:54 | 693 | 693 µS/cm |
| 28 Feb 2025, 10:38 | 751 | 751 µS/cm |
| 31 Jan 2025, 08:58 | 727 | 727 µS/cm |
| 4 Dec 2024, 11:32 | 767 | 767 µS/cm |
| 28 Nov 2024, 10:50 | 757 | 757 µS/cm |
| 21 Oct 2024, 15:48 | 753 | 753 µS/cm |
| 17 Sep 2024, 12:48 | 712 | 712 µS/cm |
| 23 Aug 2024, 11:50 | 623 | 623 µS/cm |
| 17 Jul 2024, 13:24 | 706 | 706 µS/cm |
| 20 Jun 2024, 10:39 | 720 | 720 µS/cm |
| 14 May 2024, 12:36 | 691 | 691 µS/cm |
| 17 Apr 2024, 10:33 | 771 | 771 µS/cm |
| 22 Mar 2024, 12:41 | 754 | 754 µS/cm |
| 20 Feb 2024, 10:18 | 772 | 772 µS/cm |
| 15 Jan 2024, 13:00 | 791 | 791 µS/cm |
| 6 Dec 2023, 11:04 | 776 | 776 µS/cm |
| 23 Nov 2023, 11:19 | 785 | 785 µS/cm |
| 25 Oct 2023, 15:53 | 706 | 706 µS/cm |
Everything measured here
13 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 13 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 23 | Oct 2023 – May 2026 | 99.8% 12 May 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 23 | Oct 2023 – May 2026 | 10.7 mg/l 12 May 2026 |
| Temperature of Water 0076 | River water | 23 | Oct 2023 – May 2026 | 12.1 °C 12 May 2026 |
| pH 0061 | River water | 23 | Oct 2023 – May 2026 | 8.24 12 May 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 23 | Oct 2023 – May 2026 | below 0.03 mg/l 12 May 2026 |
| Nitrate as N 0117 | River water | 23 | Oct 2023 – May 2026 | 3.89 mg/l 12 May 2026 |
| Orthophosphate, reactive as P 0180 | River water | 23 | Oct 2023 – May 2026 | 0.034 mg/l 12 May 2026 |
| Conductivity at 25 C 0077 | River water | 23 | Oct 2023 – May 2026 | 665 µS/cm 12 May 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 23 | Oct 2023 – May 2026 | 260 mg/l 12 May 2026 |
| Ammonia un-ionised as N 0119 | River water | 23 | Oct 2023 – May 2026 | below 0.00064 mg/l 12 May 2026 |
| BOD : 5 Day ATU 0085 | River water | 18 | Feb 2024 – May 2026 | 1.1 mg/l 12 May 2026 |
| Nitrite as N 0118 | River water | 23 | Oct 2023 – May 2026 | 0.008 mg/l 12 May 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 23 | Oct 2023 – May 2026 | 3.9 mg/l 12 May 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.