Caerhays Stream at Porthluney Beach
EA name: CAERHAYS STREAM AT PORTHLUNEY BEACH
Environment Agency sampling point SW-81811103 · 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
- 21 Sep 2026, 13:1510 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 72 since 4 Apr 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) · results completed 25 Sep 2026
- Where
- National Grid 197484, 41314As published, to the nearest 1 m. Open in a map
- River, by its own name
- Caerhays Stream
- River, by the map
- An unnamed streamPlaced by position alone (the only river line close by), 3 m from the line.
- Next gauge downstream
- None tracedThe map stops before any gauge.
- Why it was sampled
- Planned investigation (local monitoring) (70 samples)
Unplanned reactive monitoring (pollution incidents) (2 samples)
Results here were completed a median of 4 days after the sample was taken (2 to 12 days, 32 samples).
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
41.1%
Sampled 3 Sep 2026, 28 days ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Sep 2026, 11:40 | 41.1 | 41.1% |
| 26 Aug 2026, 12:59 | 87 | 87% |
| 20 Jul 2026, 13:30 | 96.6 | 96.6% |
| 1 Jun 2026, 11:02 | 96 | 96% |
| 8 May 2026, 11:28 | 96.8 | 96.8% |
| 24 Apr 2026, 09:08 | 92.3 | 92.3% |
| 19 Mar 2026, 11:17 | 99.9 | 99.9% |
| 10 Feb 2026, 11:02 | 96.5 | 96.5% |
| 5 Jan 2026, 13:22 | 93.9 | 93.9% |
| 2 Dec 2025, 10:33 | 93.8 | 93.8% |
| 12 Nov 2025, 10:22 | 90.6 | 90.6% |
| 7 Oct 2025, 12:14 | 103.5 | 103.5% |
| 4 Sep 2025, 10:57 | 92 | 92% |
| 1 Aug 2025, 11:15 | 93 | 93% |
| 2 Jul 2025, 12:28 | 95.9 | 95.9% |
| 3 Jun 2025, 11:20 | 94.5 | 94.5% |
| 27 May 2025, 13:11 | 93.4 | 93.4% |
| 8 Apr 2025, 11:05 | 96.6 | 96.6% |
| 21 Aug 2024, 13:00 | 105 | 105% |
| 4 Apr 2024, 14:10 | 98.5 | 98.5% |
Dissolved oxygen
as O2 · code 9924 · mg/l
3.89 mg/l
Sampled 3 Sep 2026, 28 days ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Sep 2026, 11:40 | 3.89 | 3.89 mg/l |
| 26 Aug 2026, 12:59 | 8.21 | 8.21 mg/l |
| 20 Jul 2026, 13:30 | 9.07 | 9.07 mg/l |
| 1 Jun 2026, 11:02 | 9.61 | 9.61 mg/l |
| 8 May 2026, 11:28 | 10.4 | 10.4 mg/l |
| 24 Apr 2026, 09:08 | 10.2 | 10.2 mg/l |
| 19 Mar 2026, 11:17 | 11.1 | 11.1 mg/l |
| 10 Feb 2026, 11:02 | 10.7 | 10.7 mg/l |
| 5 Jan 2026, 13:22 | 11.6 | 11.6 mg/l |
| 2 Dec 2025, 10:33 | 10.7 | 10.7 mg/l |
| 12 Nov 2025, 10:22 | 9.46 | 9.46 mg/l |
| 7 Oct 2025, 12:14 | 10.8 | 10.8 mg/l |
| 4 Sep 2025, 10:57 | 9.29 | 9.29 mg/l |
| 1 Aug 2025, 11:15 | 9.04 | 9.04 mg/l |
| 2 Jul 2025, 12:28 | 9.23 | 9.23 mg/l |
| 3 Jun 2025, 11:20 | 9.84 | 9.84 mg/l |
| 27 May 2025, 13:11 | 9.64 | 9.64 mg/l |
| 8 Apr 2025, 11:05 | 11.3 | 11.3 mg/l |
Water temperature
code 0076 · °C
17.9 °C
Sampled 3 Sep 2026, 28 days ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Sep 2026, 11:40 | 17.9 | 17.9 °C |
| 26 Aug 2026, 12:59 | 18 | 18 °C |
| 20 Jul 2026, 13:30 | 18.3 | 18.3 °C |
| 1 Jun 2026, 11:02 | 15.2 | 15.2 °C |
| 8 May 2026, 11:28 | 12.1 | 12.1 °C |
| 24 Apr 2026, 09:08 | 10.7 | 10.7 °C |
| 19 Mar 2026, 11:17 | 10.5 | 10.5 °C |
| 10 Feb 2026, 11:02 | 10.5 | 10.5 °C |
| 5 Jan 2026, 13:22 | 6.4 | 6.4 °C |
| 2 Dec 2025, 10:33 | 9.5 | 9.5 °C |
| 12 Nov 2025, 10:22 | 13.3 | 13.3 °C |
| 7 Oct 2025, 12:14 | 13.5 | 13.5 °C |
| 4 Sep 2025, 10:57 | 14.8 | 14.8 °C |
| 1 Aug 2025, 11:15 | 16.6 | 16.6 °C |
| 2 Jul 2025, 12:28 | 17.1 | 17.1 °C |
| 3 Jun 2025, 11:20 | 13.4 | 13.4 °C |
| 27 May 2025, 13:11 | 13.8 | 13.8 °C |
| 8 Apr 2025, 11:05 | 8.6 | 8.6 °C |
| 21 Aug 2024, 13:00 | 15.1 | 15.1 °C |
| 4 Apr 2024, 14:10 | 11.9 | 11.9 °C |
pH
code 0061
7.46
Sampled 3 Sep 2026, 28 days ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Sep 2026, 11:40 | 7.46 | 7.46 |
| 26 Aug 2026, 12:59 | 8.08 | 8.08 |
| 20 Jul 2026, 13:30 | 8.13 | 8.13 |
| 1 Jun 2026, 11:02 | 7.86 | 7.86 |
| 8 May 2026, 11:28 | 7.73 | 7.73 |
| 24 Apr 2026, 09:08 | 8 | 8 |
| 19 Mar 2026, 11:17 | 7.83 | 7.83 |
| 10 Feb 2026, 11:02 | 7.39 | 7.39 |
| 5 Jan 2026, 13:22 | 7.52 | 7.52 |
| 2 Dec 2025, 10:33 | 7.48 | 7.48 |
| 12 Nov 2025, 10:22 | 7.35 | 7.35 |
| 7 Oct 2025, 12:14 | 7.82 | 7.82 |
| 4 Sep 2025, 10:57 | 7.85 | 7.85 |
| 1 Aug 2025, 11:15 | 7.97 | 7.97 |
| 2 Jul 2025, 12:28 | 8.14 | 8.14 |
| 3 Jun 2025, 11:20 | 7.73 | 7.73 |
| 27 May 2025, 13:11 | 7.63 | 7.63 |
| 8 Apr 2025, 11:05 | 7.77 | 7.77 |
| 21 Aug 2024, 13:00 | 7.99 | 7.99 |
| 4 Apr 2024, 14:10 | 7.33 | 7.33 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.07 mg/l
Sampled 3 Sep 2026, 28 days ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Sep 2026, 11:40 | 0.07 | 0.07 mg/l |
| 26 Aug 2026, 12:59 | 0.042 | 0.042 mg/l |
| 20 Jul 2026, 13:30 | 0.033 | 0.033 mg/l |
| 1 Jun 2026, 11:02 | <0.03 | below 0.03 mg/l (not detected above this) |
| 8 May 2026, 11:28 | 0.031 | 0.031 mg/l |
| 24 Apr 2026, 09:08 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 Mar 2026, 11:17 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Feb 2026, 11:02 | 0.033 | 0.033 mg/l |
| 5 Jan 2026, 13:22 | 0.2 | 0.2 mg/l |
| 2 Dec 2025, 10:33 | 0.062 | 0.062 mg/l |
| 12 Nov 2025, 10:22 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 Oct 2025, 12:14 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Sep 2025, 10:57 | 0.04 | 0.04 mg/l |
| 1 Aug 2025, 11:15 | 0.037 | 0.037 mg/l |
| 2 Jul 2025, 12:28 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Jun 2025, 11:20 | <0.03 | below 0.03 mg/l (not detected above this) |
| 27 May 2025, 13:11 | <0.03 | below 0.03 mg/l (not detected above this) |
| 8 Apr 2025, 11:05 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
1.1 mg/l
Sampled 3 Sep 2026, 28 days ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Sep 2026, 11:40 | 1.1 | 1.1 mg/l |
| 26 Aug 2026, 12:59 | 6.18 | 6.18 mg/l |
| 20 Jul 2026, 13:30 | 5.79 | 5.79 mg/l |
| 1 Jun 2026, 11:02 | 6.89 | 6.89 mg/l |
| 8 May 2026, 11:28 | 6.48 | 6.48 mg/l |
| 24 Apr 2026, 09:08 | 6.79 | 6.79 mg/l |
| 19 Mar 2026, 11:17 | 6.69 | 6.69 mg/l |
| 10 Feb 2026, 11:02 | 6.79 | 6.79 mg/l |
| 5 Jan 2026, 13:22 | 6.67 | 6.67 mg/l |
| 2 Dec 2025, 10:33 | 6.39 | 6.39 mg/l |
| 12 Nov 2025, 10:22 | 3.6 | 3.6 mg/l |
| 7 Oct 2025, 12:14 | 4.49 | 4.49 mg/l |
| 4 Sep 2025, 10:57 | 3.69 | 3.69 mg/l |
| 1 Aug 2025, 11:15 | 6.88 | 6.88 mg/l |
| 2 Jul 2025, 12:28 | 7.27 | 7.27 mg/l |
| 3 Jun 2025, 11:20 | 7.69 | 7.69 mg/l |
| 27 May 2025, 13:11 | 6.99 | 6.99 mg/l |
| 8 Apr 2025, 11:05 | 7.59 | 7.59 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.017 mg/l
Sampled 3 Sep 2026, 28 days ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Sep 2026, 11:40 | 0.017 | 0.017 mg/l |
| 26 Aug 2026, 12:59 | 0.052 | 0.052 mg/l |
| 20 Jul 2026, 13:30 | 0.039 | 0.039 mg/l |
| 1 Jun 2026, 11:02 | 0.041 | 0.041 mg/l |
| 8 May 2026, 11:28 | 0.024 | 0.024 mg/l |
| 24 Apr 2026, 09:08 | 0.016 | 0.016 mg/l |
| 19 Mar 2026, 11:17 | 0.017 | 0.017 mg/l |
| 10 Feb 2026, 11:02 | 0.025 | 0.025 mg/l |
| 5 Jan 2026, 13:22 | 0.018 | 0.018 mg/l |
| 2 Dec 2025, 10:33 | 0.045 | 0.045 mg/l |
| 12 Nov 2025, 10:22 | 0.047 | 0.047 mg/l |
| 7 Oct 2025, 12:14 | 0.052 | 0.052 mg/l |
| 4 Sep 2025, 10:57 | 0.069 | 0.069 mg/l |
| 1 Aug 2025, 11:15 | 0.05 | 0.05 mg/l |
| 2 Jul 2025, 12:28 | 0.048 | 0.048 mg/l |
| 3 Jun 2025, 11:20 | 0.029 | 0.029 mg/l |
| 27 May 2025, 13:11 | 0.017 | 0.017 mg/l |
| 8 Apr 2025, 11:05 | 0.011 | 0.011 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
3724 µS/cm
Sampled 3 Sep 2026, 28 days ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Sep 2026, 11:40 | 3724 | 3724 µS/cm |
| 26 Aug 2026, 12:59 | 792 | 792 µS/cm |
| 20 Jul 2026, 13:30 | 1060 | 1060 µS/cm |
| 1 Jun 2026, 11:02 | 564 | 564 µS/cm |
| 8 May 2026, 11:28 | 377 | 377 µS/cm |
| 24 Apr 2026, 09:08 | 335 | 335 µS/cm |
| 19 Mar 2026, 11:17 | 300 | 300 µS/cm |
| 10 Feb 2026, 11:02 | 288 | 288 µS/cm |
| 5 Jan 2026, 13:22 | 408 | 408 µS/cm |
| 2 Dec 2025, 10:33 | 312 | 312 µS/cm |
| 12 Nov 2025, 10:22 | 245 | 245 µS/cm |
| 7 Oct 2025, 12:14 | 2166 | 2166 µS/cm |
| 4 Sep 2025, 10:57 | 771 | 771 µS/cm |
| 1 Aug 2025, 11:15 | 539 | 539 µS/cm |
| 2 Jul 2025, 12:28 | 455 | 455 µS/cm |
| 3 Jun 2025, 11:20 | 324 | 324 µS/cm |
| 27 May 2025, 13:11 | 844 | 844 µS/cm |
| 8 Apr 2025, 11:05 | 393 | 393 µS/cm |
| 21 Aug 2024, 13:00 | 2906 | 2906 µS/cm |
| 4 Apr 2024, 14:10 | 278 | 278 µS/cm |
E. coli
confirmed, membrane filtration · code 2348 · per 100 ml
15000 per 100 ml
Sampled 21 Sep 2026, 10 days ago · 62 results banked
Every result (62)
| Sampled | Result as published | Reads as |
|---|---|---|
| 21 Sep 2026, 13:15 | 15000 | 15000 per 100 ml |
| 16 Sep 2026, 13:25 | 12000 | 12000 per 100 ml |
| 9 Sep 2026, 10:14 | 55000 | 55000 per 100 ml |
| 3 Sep 2026, 11:40 | 4400 | 4400 per 100 ml |
| 26 Aug 2026, 12:59 | 7800 | 7800 per 100 ml |
| 18 Aug 2026, 12:30 | 6000 | 6000 per 100 ml |
| 14 Aug 2026, 11:20 | 8500 | 8500 per 100 ml |
| 6 Aug 2026, 14:03 | 3500 | 3500 per 100 ml |
| 26 Jul 2026, 10:44 | 2300 | 2300 per 100 ml |
| 20 Jul 2026, 13:30 | 1000 | 1000 per 100 ml |
| 14 Jul 2026, 10:51 | 1500 | 1500 per 100 ml |
| 10 Jul 2026, 11:10 | 1100 | 1100 per 100 ml |
| 30 Jun 2026, 10:47 | 2700 | 2700 per 100 ml |
| 23 Jun 2026, 11:40 | 2100 | 2100 per 100 ml |
| 18 Jun 2026, 11:16 | 820 | 820 per 100 ml |
| 8 Jun 2026, 14:11 | 680 | 680 per 100 ml |
| 1 Jun 2026, 11:02 | 1100 | 1100 per 100 ml |
| 27 May 2026, 11:49 | 910 | 910 per 100 ml |
| 21 May 2026, 11:50 | 240 | 240 per 100 ml |
| 16 May 2026, 13:05 | 480 | 480 per 100 ml |
| 17 Sep 2025, 11:10 | 6700 | 6700 per 100 ml |
| 8 Sep 2025, 13:06 | 5400 | 5400 per 100 ml |
| 4 Sep 2025, 10:57 | 8400 | 8400 per 100 ml |
| 28 Aug 2025, 10:27 | 23000 | 23000 per 100 ml |
| 19 Aug 2025, 15:31 | 24000 | 24000 per 100 ml |
| 15 Aug 2025, 10:20 | 28000 | 28000 per 100 ml |
| 5 Aug 2025, 13:11 | 12000 | 12000 per 100 ml |
| 1 Aug 2025, 11:15 | 20000 | 20000 per 100 ml |
| 21 Jul 2025, 12:30 | 5500 | 5500 per 100 ml |
| 15 Jul 2025, 12:21 | 3000 | 3000 per 100 ml |
| 11 Jul 2025, 11:05 | 3300 | 3300 per 100 ml |
| 2 Jul 2025, 12:28 | 1000 | 1000 per 100 ml |
| 27 Jun 2025, 12:24 | 3700 | 3700 per 100 ml |
| 22 Jun 2025, 11:49 | 2400 | 2400 per 100 ml |
| 9 Jun 2025, 12:22 | 2600 | 2600 per 100 ml |
| 3 Jun 2025, 11:20 | 6100 | 6100 per 100 ml |
| 28 May 2025, 11:56 | 1500 | 1500 per 100 ml |
| 23 May 2025, 12:15 | 410 | 410 per 100 ml |
| 18 May 2025, 11:05 | 350 | 350 per 100 ml |
| 3 May 2025, 12:35 | 830 | 830 per 100 ml |
| 20 Sep 2024, 12:34 | 5500 | 5500 per 100 ml |
| 10 Sep 2024, 13:03 | 3400 | 3400 per 100 ml |
| 3 Sep 2024, 13:10 | 19000 | 19000 per 100 ml |
| 26 Aug 2024, 12:09 | 6200 | 6200 per 100 ml |
| 23 Aug 2024, 11:02 | 13000 | 13000 per 100 ml |
| 21 Aug 2024, 13:00 | 5500 | 5500 per 100 ml |
| 13 Aug 2024, 13:37 | 21000 | 21000 per 100 ml |
| 8 Aug 2024, 12:53 | 24000 | 24000 per 100 ml |
| 29 Jul 2024, 14:40 | 2300 | 2300 per 100 ml |
| 24 Jul 2024, 11:10 | 2700 | 2700 per 100 ml |
| 21 Jul 2024, 14:50 | 1700 | 1700 per 100 ml |
| 8 Jul 2024, 11:32 | 2000 | 2000 per 100 ml |
| 3 Jul 2024, 13:21 | 1100 | 1100 per 100 ml |
| 24 Jun 2024, 11:50 | 1100 | 1100 per 100 ml |
| 17 Jun 2024, 11:18 | 890 | 890 per 100 ml |
| 11 Jun 2024, 13:19 | 760 | 760 per 100 ml |
| 4 Jun 2024, 12:40 | 430 | 430 per 100 ml |
| 31 May 2024, 11:40 | 470 | 470 per 100 ml |
| 25 May 2024, 12:06 | 380 | 380 per 100 ml |
| 17 May 2024, 11:55 | 480 | 480 per 100 ml |
| 3 May 2024, 12:36 | 430 | 430 per 100 ml |
| 4 Apr 2024, 14:10 | 1000 | 1000 per 100 ml |
Everything measured here
22 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 22 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 20 | Apr 2024 – Sep 2026 | 41.1% 3 Sep 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 18 | Apr 2025 – Sep 2026 | 3.89 mg/l 3 Sep 2026 |
| Temperature of Water 0076 | River water | 20 | Apr 2024 – Sep 2026 | 17.9 °C 3 Sep 2026 |
| pH 0061 | River water | 20 | Apr 2024 – Sep 2026 | 7.46 3 Sep 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 18 | Apr 2025 – Sep 2026 | 0.07 mg/l 3 Sep 2026 |
| Nitrate as N 0117 | River water | 18 | Apr 2025 – Sep 2026 | 1.1 mg/l 3 Sep 2026 |
| Orthophosphate, reactive as P 0180 | River water | 18 | Apr 2025 – Sep 2026 | 0.017 mg/l 3 Sep 2026 |
| Conductivity at 25 C 0077 | River water | 20 | Apr 2024 – Sep 2026 | 3724 µS/cm 3 Sep 2026 |
| Escherichia coli : Confirmed : MF 2348 | River water | 62 | Apr 2024 – Sep 2026 | 15000 per 100 ml 21 Sep 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 18 | Apr 2025 – Sep 2026 | 92 mg/l 3 Sep 2026 |
| Ammonia un-ionised as N 0119 | River water | 18 | Apr 2025 – Sep 2026 | 0.00067 mg/l 3 Sep 2026 |
| Bacteroides HF183 primer 5886 | River water | 3 | Aug 2024 – Aug 2024 | Present / 100ml 23 Aug 2024 |
| Bacteroidetes Marker : Human copy number 3820 | River water | 3 | Aug 2024 – Aug 2024 | 4.1 log (10) gene copies / 100ml 23 Aug 2024 |
| Bacteroidetes Marker : Ruminant 4906 | River water | 3 | Aug 2024 – Aug 2024 | Present 23 Aug 2024 |
| Bacteroidetes Marker : Ruminant copy number 3819 | River water | 3 | Aug 2024 – Aug 2024 | 5.3 log (10) gene copies / 100ml 23 Aug 2024 |
| Enterococci: Intestinal: Presumptive: MF 3722 | River water | 62 | Apr 2024 – Sep 2026 | 5300 colony forming units / 100ml 21 Sep 2026 |
| Microbial Source Tracking 4876 | River water | 3 | Aug 2024 – Aug 2024 | 1 text result 23 Aug 2024 |
| MST Filtration 4926 | River water | 62 | Apr 2024 – Sep 2026 | DNA Stored 21 Sep 2026 |
| Nitrite as N 0118 | River water | 18 | Apr 2025 – Sep 2026 | 1.7 mg/l 3 Sep 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 18 | Apr 2025 – Sep 2026 | 2.8 mg/l 3 Sep 2026 |
| Preparation: DNA 5923 | River water | 3 | Aug 2024 – Aug 2024 | Done 23 Aug 2024 |
| Volume of Sample Filtered 4865 | River water | 62 | Apr 2024 – Sep 2026 | 730 millilitre 21 Sep 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.