Mevagissey Stream at Harbour
EA name: MEVAGISSEY STREAM AT HARBOUR
Environment Agency sampling point SW-81810602 · 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
- 16 Mar 2026, 10:207 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
- 24 since 18 Jul 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 201511, 44844As published, to the nearest 1 m. Open in a map
- River, by its own name
- Mevagissey Stream
- River, by the map
- Mevagissey StreamPlaced on the river its name gives, 3 m from the line.
- Next gauge downstream
- None tracedThe map stops before any gauge.
- Nearest gauge upstream
- Mevagissey On the Mevagissey Stream · 0.5 km along the river
- Why it was sampled
- Planned investigation (local monitoring) (24 samples)
2 visits found no water to sample (recorded as “No flow”).
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
98.2%
Sampled 16 Mar 2026, 7 months ago · 17 results banked
Every result (17)
| Sampled | Result as published | Reads as |
|---|---|---|
| 16 Mar 2026, 10:20 | 98.2 | 98.2% |
| 13 Feb 2026, 09:00 | 99 | 99% |
| 16 Jan 2026, 09:50 | 98.7 | 98.7% |
| 18 Dec 2025, 09:00 | 99 | 99% |
| 17 Nov 2025, 08:50 | 98 | 98% |
| 24 Oct 2025, 12:15 | 96.8 | 96.8% |
| 9 Sep 2025, 15:45 | 95.5 | 95.5% |
| 24 Apr 2025, 10:57 | 100 | 100% |
| 15 Apr 2025, 14:49 | 98.9 | 98.9% |
| 13 Mar 2025, 11:11 | 101.2 | 101.2% |
| 25 Feb 2025, 09:50 | 99 | 99% |
| 16 Jan 2025, 10:00 | 99 | 99% |
| 10 Dec 2024, 12:05 | 100 | 100% |
| 13 Nov 2024, 11:35 | 99.5 | 99.5% |
| 29 Oct 2024, 11:00 | 98.7 | 98.7% |
| 25 Sep 2024, 11:47 | 94.5 | 94.5% |
| 18 Jul 2024, 10:18 | 99.8 | 99.8% |
Dissolved oxygen
as O2 · code 9924 · mg/l
11.1 mg/l
Sampled 16 Mar 2026, 7 months ago · 17 results banked
Every result (17)
| Sampled | Result as published | Reads as |
|---|---|---|
| 16 Mar 2026, 10:20 | 11.1 | 11.1 mg/l |
| 13 Feb 2026, 09:00 | 11.4 | 11.4 mg/l |
| 16 Jan 2026, 09:50 | 11.5 | 11.5 mg/l |
| 18 Dec 2025, 09:00 | 10.7 | 10.7 mg/l |
| 17 Nov 2025, 08:50 | 10.8 | 10.8 mg/l |
| 24 Oct 2025, 12:15 | 10.6 | 10.6 mg/l |
| 9 Sep 2025, 15:45 | 9.67 | 9.67 mg/l |
| 24 Apr 2025, 10:57 | 10.9 | 10.9 mg/l |
| 15 Apr 2025, 14:49 | 11.3 | 11.3 mg/l |
| 13 Mar 2025, 11:11 | 12.1 | 12.1 mg/l |
| 25 Feb 2025, 09:50 | 11.2 | 11.2 mg/l |
| 16 Jan 2025, 10:00 | 11.3 | 11.3 mg/l |
| 10 Dec 2024, 12:05 | 11.4 | 11.4 mg/l |
| 13 Nov 2024, 11:35 | 11.1 | 11.1 mg/l |
| 29 Oct 2024, 11:00 | 10.4 | 10.4 mg/l |
| 25 Sep 2024, 11:47 | 9.65 | 9.65 mg/l |
| 18 Jul 2024, 10:18 | 9.95 | 9.95 mg/l |
Water temperature
code 0076 · °C
9.9 °C
Sampled 16 Mar 2026, 7 months ago · 17 results banked
Every result (17)
| Sampled | Result as published | Reads as |
|---|---|---|
| 16 Mar 2026, 10:20 | 9.9 | 9.9 °C |
| 13 Feb 2026, 09:00 | 9 | 9 °C |
| 16 Jan 2026, 09:50 | 8.7 | 8.7 °C |
| 18 Dec 2025, 09:00 | 11.6 | 11.6 °C |
| 17 Nov 2025, 08:50 | 11 | 11 °C |
| 24 Oct 2025, 12:15 | 11.1 | 11.1 °C |
| 9 Sep 2025, 15:45 | 14.7 | 14.7 °C |
| 24 Apr 2025, 10:57 | 11.3 | 11.3 °C |
| 15 Apr 2025, 14:49 | 9.5 | 9.5 °C |
| 13 Mar 2025, 11:11 | 7.5 | 7.5 °C |
| 25 Feb 2025, 09:50 | 9.9 | 9.9 °C |
| 16 Jan 2025, 10:00 | 9.3 | 9.3 °C |
| 10 Dec 2024, 12:05 | 9.4 | 9.4 °C |
| 13 Nov 2024, 11:35 | 10.5 | 10.5 °C |
| 29 Oct 2024, 11:00 | 12.9 | 12.9 °C |
| 25 Sep 2024, 11:47 | 14.3 | 14.3 °C |
| 18 Jul 2024, 10:18 | 15.4 | 15.4 °C |
pH
code 0061
7.58
Sampled 16 Mar 2026, 7 months ago · 17 results banked
Every result (17)
| Sampled | Result as published | Reads as |
|---|---|---|
| 16 Mar 2026, 10:20 | 7.58 | 7.58 |
| 13 Feb 2026, 09:00 | 7.65 | 7.65 |
| 16 Jan 2026, 09:50 | 7.71 | 7.71 |
| 18 Dec 2025, 09:00 | 7.32 | 7.32 |
| 17 Nov 2025, 08:50 | 7.43 | 7.43 |
| 24 Oct 2025, 12:15 | 7.36 | 7.36 |
| 9 Sep 2025, 15:45 | 7.62 | 7.62 |
| 24 Apr 2025, 10:57 | 7.55 | 7.55 |
| 15 Apr 2025, 14:49 | 7.45 | 7.45 |
| 13 Mar 2025, 11:11 | 7.67 | 7.67 |
| 25 Feb 2025, 09:50 | 7.31 | 7.31 |
| 16 Jan 2025, 10:00 | 7.61 | 7.61 |
| 10 Dec 2024, 12:05 | 7.46 | 7.46 |
| 13 Nov 2024, 11:35 | 7.71 | 7.71 |
| 29 Oct 2024, 11:00 | 7.57 | 7.57 |
| 25 Sep 2024, 11:47 | 7.37 | 7.37 |
| 18 Jul 2024, 10:18 | 7.8 | 7.8 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.048 mg/l
Sampled 16 Mar 2026, 7 months ago · 17 results banked
Every result (17)
| Sampled | Result as published | Reads as |
|---|---|---|
| 16 Mar 2026, 10:20 | 0.048 | 0.048 mg/l |
| 13 Feb 2026, 09:00 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Jan 2026, 09:50 | <0.03 | below 0.03 mg/l (not detected above this) |
| 18 Dec 2025, 09:00 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Nov 2025, 08:50 | <0.03 | below 0.03 mg/l (not detected above this) |
| 24 Oct 2025, 12:15 | 0.042 | 0.042 mg/l |
| 9 Sep 2025, 15:45 | 0.07 | 0.07 mg/l |
| 24 Apr 2025, 10:57 | 0.036 | 0.036 mg/l |
| 15 Apr 2025, 14:49 | 0.073 | 0.073 mg/l |
| 13 Mar 2025, 11:11 | <0.03 | below 0.03 mg/l (not detected above this) |
| 25 Feb 2025, 09:50 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Jan 2025, 10:00 | 0.035 | 0.035 mg/l |
| 10 Dec 2024, 12:05 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 Nov 2024, 11:35 | 0.031 | 0.031 mg/l |
| 29 Oct 2024, 11:00 | 0.033 | 0.033 mg/l |
| 25 Sep 2024, 11:47 | 0.38 | 0.38 mg/l |
| 18 Jul 2024, 10:18 | 0.036 | 0.036 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
5.6 mg/l
Sampled 16 Mar 2026, 7 months ago · 17 results banked
Every result (17)
| Sampled | Result as published | Reads as |
|---|---|---|
| 16 Mar 2026, 10:20 | 5.6 | 5.6 mg/l |
| 13 Feb 2026, 09:00 | 6.1 | 6.1 mg/l |
| 16 Jan 2026, 09:50 | 6.6 | 6.6 mg/l |
| 18 Dec 2025, 09:00 | 6.4 | 6.4 mg/l |
| 17 Nov 2025, 08:50 | 5.9 | 5.9 mg/l |
| 24 Oct 2025, 12:15 | 3.79 | 3.79 mg/l |
| 9 Sep 2025, 15:45 | 3.09 | 3.09 mg/l |
| 24 Apr 2025, 10:57 | 4.5 | 4.5 mg/l |
| 15 Apr 2025, 14:49 | 2.09 | 2.09 mg/l |
| 13 Mar 2025, 11:11 | 5.69 | 5.69 mg/l |
| 25 Feb 2025, 09:50 | 4.8 | 4.8 mg/l |
| 16 Jan 2025, 10:00 | 5.9 | 5.9 mg/l |
| 10 Dec 2024, 12:05 | 5.4 | 5.4 mg/l |
| 13 Nov 2024, 11:35 | 5.09 | 5.09 mg/l |
| 29 Oct 2024, 11:00 | 5.59 | 5.59 mg/l |
| 25 Sep 2024, 11:47 | 1.89 | 1.89 mg/l |
| 18 Jul 2024, 10:18 | 5.29 | 5.29 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.016 mg/l
Sampled 16 Mar 2026, 7 months ago · 17 results banked
Every result (17)
| Sampled | Result as published | Reads as |
|---|---|---|
| 16 Mar 2026, 10:20 | 0.016 | 0.016 mg/l |
| 13 Feb 2026, 09:00 | 0.016 | 0.016 mg/l |
| 16 Jan 2026, 09:50 | 0.015 | 0.015 mg/l |
| 18 Dec 2025, 09:00 | 0.018 | 0.018 mg/l |
| 17 Nov 2025, 08:50 | 0.021 | 0.021 mg/l |
| 24 Oct 2025, 12:15 | 0.024 | 0.024 mg/l |
| 9 Sep 2025, 15:45 | 0.033 | 0.033 mg/l |
| 24 Apr 2025, 10:57 | 0.015 | 0.015 mg/l |
| 15 Apr 2025, 14:49 | 0.04 | 0.04 mg/l |
| 13 Mar 2025, 11:11 | 0.015 | 0.015 mg/l |
| 25 Feb 2025, 09:50 | 0.015 | 0.015 mg/l |
| 16 Jan 2025, 10:00 | 0.019 | 0.019 mg/l |
| 10 Dec 2024, 12:05 | 0.011 | 0.011 mg/l |
| 13 Nov 2024, 11:35 | 0.018 | 0.018 mg/l |
| 29 Oct 2024, 11:00 | 0.014 | 0.014 mg/l |
| 25 Sep 2024, 11:47 | 0.047 | 0.047 mg/l |
| 18 Jul 2024, 10:18 | 0.027 | 0.027 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
298 µS/cm
Sampled 16 Mar 2026, 7 months ago · 17 results banked
Every result (17)
| Sampled | Result as published | Reads as |
|---|---|---|
| 16 Mar 2026, 10:20 | 298 | 298 µS/cm |
| 13 Feb 2026, 09:00 | 289 | 289 µS/cm |
| 16 Jan 2026, 09:50 | 460 | 460 µS/cm |
| 18 Dec 2025, 09:00 | 294 | 294 µS/cm |
| 17 Nov 2025, 08:50 | 435 | 435 µS/cm |
| 24 Oct 2025, 12:15 | 592 | 592 µS/cm |
| 9 Sep 2025, 15:45 | 800 | 800 µS/cm |
| 24 Apr 2025, 10:57 | 315 | 315 µS/cm |
| 15 Apr 2025, 14:49 | 232 | 232 µS/cm |
| 13 Mar 2025, 11:11 | 518 | 518 µS/cm |
| 25 Feb 2025, 09:50 | 276 | 276 µS/cm |
| 16 Jan 2025, 10:00 | 536 | 536 µS/cm |
| 10 Dec 2024, 12:05 | 6100 | 6100 µS/cm |
| 13 Nov 2024, 11:35 | 338 | 338 µS/cm |
| 29 Oct 2024, 11:00 | 331 | 331 µS/cm |
| 25 Sep 2024, 11:47 | 6852 | 6852 µS/cm |
| 18 Jul 2024, 10:18 | 344 | 344 µS/cm |
E. coli
confirmed, membrane filtration · code 2348 · per 100 ml
5800 per 100 ml
Sampled 16 Mar 2026, 7 months ago · 22 results banked
Every result (22)
| Sampled | Result as published | Reads as |
|---|---|---|
| 16 Mar 2026, 10:20 | 5800 | 5800 per 100 ml |
| 13 Feb 2026, 09:00 | 3000 | 3000 per 100 ml |
| 16 Jan 2026, 09:50 | 430 | 430 per 100 ml |
| 18 Dec 2025, 09:00 | 1400 | 1400 per 100 ml |
| 17 Nov 2025, 08:50 | 820 | 820 per 100 ml |
| 24 Oct 2025, 12:15 | 8500 | 8500 per 100 ml |
| 9 Sep 2025, 15:45 | 10000 | 10000 per 100 ml |
| 8 Sep 2025, 10:53 | 39000 | 39000 per 100 ml |
| 28 Aug 2025, 13:24 | 42000 | 42000 per 100 ml |
| 26 Jun 2025, 12:02 | 3100 | 3100 per 100 ml |
| 29 May 2025, 12:05 | 740 | 740 per 100 ml |
| 24 Apr 2025, 10:57 | 560 | 560 per 100 ml |
| 15 Apr 2025, 14:49 | 13000 | 13000 per 100 ml |
| 13 Mar 2025, 11:11 | 330 | 330 per 100 ml |
| 25 Feb 2025, 09:50 | 210 | 210 per 100 ml |
| 29 Jan 2025, 10:43 | 1000 | 1000 per 100 ml |
| 16 Jan 2025, 10:00 | 170 | 170 per 100 ml |
| 10 Dec 2024, 12:05 | 250 | 250 per 100 ml |
| 13 Nov 2024, 11:35 | 770 | 770 per 100 ml |
| 29 Oct 2024, 11:00 | 2500 | 2500 per 100 ml |
| 25 Sep 2024, 11:47 | 26000 | 26000 per 100 ml |
| 18 Jul 2024, 10:18 | 4300 | 4300 per 100 ml |
Everything measured here
26 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 26 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 17 | Jul 2024 – Mar 2026 | 98.2% 16 Mar 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 17 | Jul 2024 – Mar 2026 | 11.1 mg/l 16 Mar 2026 |
| Temperature of Water 0076 | River water | 17 | Jul 2024 – Mar 2026 | 9.9 °C 16 Mar 2026 |
| pH 0061 | River water | 17 | Jul 2024 – Mar 2026 | 7.58 16 Mar 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 17 | Jul 2024 – Mar 2026 | 0.048 mg/l 16 Mar 2026 |
| Nitrate as N 0117 | River water | 17 | Jul 2024 – Mar 2026 | 5.6 mg/l 16 Mar 2026 |
| Orthophosphate, reactive as P 0180 | River water | 17 | Jul 2024 – Mar 2026 | 0.016 mg/l 16 Mar 2026 |
| Conductivity at 25 C 0077 | River water | 17 | Jul 2024 – Mar 2026 | 298 µS/cm 16 Mar 2026 |
| Escherichia coli : Confirmed : MF 2348 | River water | 22 | Jul 2024 – Mar 2026 | 5800 per 100 ml 16 Mar 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 16 | Jul 2024 – Mar 2026 | 54 mg/l 16 Mar 2026 |
| Ammonia un-ionised as N 0119 | River water | 17 | Jul 2024 – Mar 2026 | 0.00033 mg/l 16 Mar 2026 |
| Bacteroides HF183 primer 5886 | River water | 1 | Apr 2025 – Apr 2025 | Present / 100ml 15 Apr 2025 |
| Bacteroidetes Marker : Human copy number 3820 | River water | 1 | Apr 2025 – Apr 2025 | 5.9 log (10) gene copies / 100ml 15 Apr 2025 |
| Bacteroidetes Marker : Ruminant 4906 | River water | 1 | Apr 2025 – Apr 2025 | Present 15 Apr 2025 |
| Bacteroidetes Marker : Ruminant copy number 3819 | River water | 1 | Apr 2025 – Apr 2025 | 6.3 log (10) gene copies / 100ml 15 Apr 2025 |
| Enterococci: Intestinal: Presumptive: MF 3722 | River water | 22 | Jul 2024 – Mar 2026 | 780 colony forming units / 100ml 16 Mar 2026 |
| Microbial Source Tracking 4876 | River water | 1 | Apr 2025 – Apr 2025 | 1 text result 15 Apr 2025 |
| MST Filtration 4926 | River water | 22 | Jul 2024 – Mar 2026 | DNA Stored 16 Mar 2026 |
| Nitrite as N 0118 | River water | 17 | Jul 2024 – Mar 2026 | below 0.004 mg/l 16 Mar 2026 |
| Nitrogen, Total as N 9686 | River water | 16 | Jul 2024 – Mar 2026 | 5.8 mg/l 16 Mar 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 17 | Jul 2024 – Mar 2026 | 5.6 mg/l 16 Mar 2026 |
| No flow /No sample 7668 | River water | 2 | Aug 2024 – Oct 2024 | Sample pnt inaccessible eg flooding etc 7 Oct 2024 |
| Phosphorus, Total as P 0348 | River water | 16 | Jul 2024 – Mar 2026 | 0.028 mg/l 16 Mar 2026 |
| Preparation: DNA 5923 | River water | 1 | Apr 2025 – Apr 2025 | Done 15 Apr 2025 |
| Solids, Suspended at 105 C 0135 | River water | 17 | Jul 2024 – Mar 2026 | 5.1 mg/l 16 Mar 2026 |
| Volume of Sample Filtered 4865 | River water | 22 | Jul 2024 – Mar 2026 | 930 millilitre 16 Mar 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.