River Vyrnwy - Melverley Chur
EA name: RIVER VYRNWY - MELVERLEY CHUR (also listed as “RIVER VYRNWY - MELVERLEY CHURCH VYRNWY CONFLUENCE TO DAM”)
Environment Agency sampling point MD-30653040 · 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
- 17 Sep 2026, 12:2714 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 51 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) · results completed 22 Sep 2026
- Where
- National Grid 333230, 316480As published, to the nearest 10 m. Open in a map
- River, by its own name
- Vyrnwy
- River, by the map
- Afon EfyrnwyPlaced on the river its name gives, 24 m from the line.
- Next gauge downstream
- Crew Green On the River Severn · 1.3 km along the river
- Nearest gauge upstream
- Llanymynech River Station On the Vyrnwy · 17 km along the river
- Why it was sampled
- Planned investigation (local monitoring) (31 samples)
Monitoring (national agency policy) (20 samples)
Results here were completed a median of 5 days after the sample was taken (5 to 20 days, 25 samples).
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
98.4%
Sampled 15 Apr 2026, 6 months ago · 19 results banked
Every result (19)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Apr 2026, 13:04 | 98.4 | 98.4% |
| 6 Mar 2026, 10:29 | 92.5 | 92.5% |
| 8 Jan 2026, 12:00 | 98.8 | 98.8% |
| 28 Nov 2025, 11:57 | 96 | 96% |
| 10 Oct 2025, 12:16 | 94.5 | 94.5% |
| 1 Sep 2025, 10:39 | 93.1 | 93.1% |
| 8 Aug 2025, 12:06 | 100.1 | 100.1% |
| 17 Jul 2025, 11:31 | 92.7 | 92.7% |
| 21 May 2025, 12:26 | 92.4 | 92.4% |
| 4 Apr 2025, 12:49 | 106.1 | 106.1% |
| 13 Mar 2025, 13:17 | 97.9 | 97.9% |
| 20 Feb 2025, 11:35 | 101.6 | 101.6% |
| 20 Jan 2025, 10:47 | 97.1 | 97.1% |
| 4 Dec 2024, 07:45 | 92.8 | 92.8% |
| 20 Nov 2024, 10:43 | 93.5 | 93.5% |
| 14 Oct 2024, 10:00 | 95.4 | 95.4% |
| 19 Aug 2024, 13:09 | 94.3 | 94.3% |
| 16 Jul 2024, 12:33 | 89.9 | 89.9% |
| 18 Jun 2024, 12:46 | 92.1 | 92.1% |
Dissolved oxygen
as O2 · code 9924 · mg/l
11 mg/l
Sampled 15 Apr 2026, 6 months ago · 19 results banked
Every result (19)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Apr 2026, 13:04 | 11 | 11 mg/l |
| 6 Mar 2026, 10:29 | 10.9 | 10.9 mg/l |
| 8 Jan 2026, 12:00 | 12.9 | 12.9 mg/l |
| 28 Nov 2025, 11:57 | 11 | 11 mg/l |
| 10 Oct 2025, 12:16 | 10.1 | 10.1 mg/l |
| 1 Sep 2025, 10:39 | 9.18 | 9.18 mg/l |
| 8 Aug 2025, 12:06 | 9.53 | 9.53 mg/l |
| 17 Jul 2025, 11:31 | 8.79 | 8.79 mg/l |
| 21 May 2025, 12:26 | 8.93 | 8.93 mg/l |
| 4 Apr 2025, 12:49 | 11.2 | 11.2 mg/l |
| 13 Mar 2025, 13:17 | 11.9 | 11.9 mg/l |
| 20 Feb 2025, 11:35 | 12.3 | 12.3 mg/l |
| 20 Jan 2025, 10:47 | 12.5 | 12.5 mg/l |
| 4 Dec 2024, 07:45 | 11.5 | 11.5 mg/l |
| 20 Nov 2024, 10:43 | 12.1 | 12.1 mg/l |
| 14 Oct 2024, 10:00 | 11.1 | 11.1 mg/l |
| 19 Aug 2024, 13:09 | 9.28 | 9.28 mg/l |
| 16 Jul 2024, 12:33 | 8.91 | 8.91 mg/l |
| 18 Jun 2024, 12:46 | 9.43 | 9.43 mg/l |
Water temperature
code 0076 · °C
10.2 °C
Sampled 15 Apr 2026, 6 months ago · 19 results banked
Every result (19)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Apr 2026, 13:04 | 10.2 | 10.2 °C |
| 6 Mar 2026, 10:29 | 8 | 8 °C |
| 8 Jan 2026, 12:00 | 4 | 4 °C |
| 28 Nov 2025, 11:57 | 9.4 | 9.4 °C |
| 10 Oct 2025, 12:16 | 12.4 | 12.4 °C |
| 1 Sep 2025, 10:39 | 15.9 | 15.9 °C |
| 8 Aug 2025, 12:06 | 17.6 | 17.6 °C |
| 17 Jul 2025, 11:31 | 17.8 | 17.8 °C |
| 21 May 2025, 12:26 | 16.9 | 16.9 °C |
| 4 Apr 2025, 12:49 | 12.8 | 12.8 °C |
| 13 Mar 2025, 13:17 | 7 | 7 °C |
| 20 Feb 2025, 11:35 | 7.2 | 7.2 °C |
| 20 Jan 2025, 10:47 | 4.5 | 4.5 °C |
| 4 Dec 2024, 07:45 | 6 | 6 °C |
| 20 Nov 2024, 10:43 | 4.3 | 4.3 °C |
| 14 Oct 2024, 10:00 | 8.5 | 8.5 °C |
| 19 Aug 2024, 13:09 | 16 | 16 °C |
| 16 Jul 2024, 12:33 | 15.7 | 15.7 °C |
| 18 Jun 2024, 12:46 | 14.2 | 14.2 °C |
pH
code 0061
7.67
Sampled 15 Apr 2026, 6 months ago · 19 results banked
Every result (19)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Apr 2026, 13:04 | 7.67 | 7.67 |
| 6 Mar 2026, 10:29 | 7.67 | 7.67 |
| 8 Jan 2026, 12:00 | 8.17 | 8.17 |
| 28 Nov 2025, 11:57 | 7.49 | 7.49 |
| 10 Oct 2025, 12:16 | 7.54 | 7.54 |
| 1 Sep 2025, 10:39 | 7.91 | 7.91 |
| 8 Aug 2025, 12:06 | 8.01 | 8.01 |
| 17 Jul 2025, 11:31 | 7.45 | 7.45 |
| 21 May 2025, 12:26 | 7.71 | 7.71 |
| 4 Apr 2025, 12:49 | 8.03 | 8.03 |
| 13 Mar 2025, 13:17 | 7.95 | 7.95 |
| 20 Feb 2025, 11:35 | 8.04 | 8.04 |
| 20 Jan 2025, 10:47 | 7.45 | 7.45 |
| 4 Dec 2024, 07:45 | 7.45 | 7.45 |
| 20 Nov 2024, 10:43 | 7.79 | 7.79 |
| 14 Oct 2024, 10:00 | 7.89 | 7.89 |
| 19 Aug 2024, 13:09 | 7.53 | 7.53 |
| 16 Jul 2024, 12:33 | 7.79 | 7.79 |
| 18 Jun 2024, 12:46 | 7.9 | 7.9 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 15 Apr 2026, 6 months ago · 19 results banked
Every result (19)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Apr 2026, 13:04 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 Mar 2026, 10:29 | 0.2 | 0.2 mg/l |
| 8 Jan 2026, 12:00 | 0.11 | 0.11 mg/l |
| 28 Nov 2025, 11:57 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Oct 2025, 12:16 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Sep 2025, 10:39 | <0.03 | below 0.03 mg/l (not detected above this) |
| 8 Aug 2025, 12:06 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Jul 2025, 11:31 | <0.03 | below 0.03 mg/l (not detected above this) |
| 21 May 2025, 12:26 | 0.041 | 0.041 mg/l |
| 4 Apr 2025, 12:49 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 Mar 2025, 13:17 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 Feb 2025, 11:35 | 0.054 | 0.054 mg/l |
| 20 Jan 2025, 10:47 | 0.045 | 0.045 mg/l |
| 4 Dec 2024, 07:45 | 0.085 | 0.085 mg/l |
| 20 Nov 2024, 10:43 | 0.077 | 0.077 mg/l |
| 14 Oct 2024, 10:00 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 Aug 2024, 13:09 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Jul 2024, 12:33 | 0.084 | 0.084 mg/l |
| 18 Jun 2024, 12:46 | 0.033 | 0.033 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
1.3 mg/l
Sampled 15 Apr 2026, 6 months ago · 19 results banked
Every result (19)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Apr 2026, 13:04 | 1.3 | 1.3 mg/l |
| 6 Mar 2026, 10:29 | 2.19 | 2.19 mg/l |
| 8 Jan 2026, 12:00 | 1.49 | 1.49 mg/l |
| 28 Nov 2025, 11:57 | 1.3 | 1.3 mg/l |
| 10 Oct 2025, 12:16 | 0.996 | 0.996 mg/l |
| 1 Sep 2025, 10:39 | 1.2 | 1.2 mg/l |
| 8 Aug 2025, 12:06 | 0.776 | 0.776 mg/l |
| 17 Jul 2025, 11:31 | 0.666 | 0.666 mg/l |
| 21 May 2025, 12:26 | 1.59 | 1.59 mg/l |
| 4 Apr 2025, 12:49 | 1.87 | 1.87 mg/l |
| 13 Mar 2025, 13:17 | 2.09 | 2.09 mg/l |
| 20 Feb 2025, 11:35 | 2.29 | 2.29 mg/l |
| 20 Jan 2025, 10:47 | 1.79 | 1.79 mg/l |
| 4 Dec 2024, 07:45 | 1.49 | 1.49 mg/l |
| 20 Nov 2024, 10:43 | 1.59 | 1.59 mg/l |
| 14 Oct 2024, 10:00 | 1.1 | 1.1 mg/l |
| 19 Aug 2024, 13:09 | 1.2 | 1.2 mg/l |
| 16 Jul 2024, 12:33 | 1.78 | 1.78 mg/l |
| 18 Jun 2024, 12:46 | 1.19 | 1.19 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.014 mg/l
Sampled 15 Apr 2026, 6 months ago · 19 results banked
Every result (19)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Apr 2026, 13:04 | 0.014 | 0.014 mg/l |
| 6 Mar 2026, 10:29 | 0.043 | 0.043 mg/l |
| 8 Jan 2026, 12:00 | 0.032 | 0.032 mg/l |
| 28 Nov 2025, 11:57 | 0.048 | 0.048 mg/l |
| 10 Oct 2025, 12:16 | 0.021 | 0.021 mg/l |
| 1 Sep 2025, 10:39 | 0.021 | 0.021 mg/l |
| 8 Aug 2025, 12:06 | 0.031 | 0.031 mg/l |
| 17 Jul 2025, 11:31 | 0.03 | 0.03 mg/l |
| 21 May 2025, 12:26 | 0.029 | 0.029 mg/l |
| 4 Apr 2025, 12:49 | <0.01 | below 0.01 mg/l (not detected above this) |
| 13 Mar 2025, 13:17 | 0.03 | 0.03 mg/l |
| 20 Feb 2025, 11:35 | 0.057 | 0.057 mg/l |
| 20 Jan 2025, 10:47 | 0.2 | 0.2 mg/l |
| 4 Dec 2024, 07:45 | 0.05 | 0.05 mg/l |
| 20 Nov 2024, 10:43 | 0.064 | 0.064 mg/l |
| 14 Oct 2024, 10:00 | 0.024 | 0.024 mg/l |
| 19 Aug 2024, 13:09 | 0.13 | 0.13 mg/l |
| 16 Jul 2024, 12:33 | 0.16 | 0.16 mg/l |
| 18 Jun 2024, 12:46 | 0.045 | 0.045 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
149 µS/cm
Sampled 15 Apr 2026, 6 months ago · 19 results banked
Every result (19)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Apr 2026, 13:04 | 149 | 149 µS/cm |
| 6 Mar 2026, 10:29 | 179 | 179 µS/cm |
| 8 Jan 2026, 12:00 | 161 | 161 µS/cm |
| 28 Nov 2025, 11:57 | 126 | 126 µS/cm |
| 10 Oct 2025, 12:16 | 133 | 133 µS/cm |
| 1 Sep 2025, 10:39 | 214 | 214 µS/cm |
| 8 Aug 2025, 12:06 | 176 | 176 µS/cm |
| 17 Jul 2025, 11:31 | 114 | 114 µS/cm |
| 21 May 2025, 12:26 | 226 | 226 µS/cm |
| 4 Apr 2025, 12:49 | 243 | 243 µS/cm |
| 13 Mar 2025, 13:17 | 217 | 217 µS/cm |
| 20 Feb 2025, 11:35 | 223 | 223 µS/cm |
| 20 Jan 2025, 10:47 | 168 | 168 µS/cm |
| 4 Dec 2024, 07:45 | 155 | 155 µS/cm |
| 20 Nov 2024, 10:43 | 171 | 171 µS/cm |
| 14 Oct 2024, 10:00 | 146 | 146 µS/cm |
| 19 Aug 2024, 13:09 | 165 | 165 µS/cm |
| 16 Jul 2024, 12:33 | 199 | 199 µS/cm |
| 18 Jun 2024, 12:46 | 157 | 157 µS/cm |
E. coli
confirmed, membrane filtration · code 2348 · per 100 ml
690 per 100 ml
Sampled 17 Sep 2026, 14 days ago · 32 results banked
Every result (32)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Sep 2026, 12:27 | 690 | 690 per 100 ml |
| 8 Sep 2026, 12:53 | 200 | 200 per 100 ml |
| 3 Sep 2026, 14:08 | 150 | 150 per 100 ml |
| 27 Aug 2026, 13:20 | 200 | 200 per 100 ml |
| 23 Aug 2026, 11:57 | 63 | 63 per 100 ml |
| 19 Aug 2026, 11:05 | 99 | 99 per 100 ml |
| 11 Aug 2026, 11:21 | 63 | 63 per 100 ml |
| 5 Aug 2026, 13:06 | 72 | 72 per 100 ml |
| 28 Jul 2026, 13:53 | 200 | 200 per 100 ml |
| 22 Jul 2026, 13:24 | 90 | 90 per 100 ml |
| 7 Jul 2026, 10:39 | 72 | 72 per 100 ml |
| 1 Jul 2026, 12:33 | 240 | 240 per 100 ml |
| 10 Jun 2026, 12:49 | 1000 | 1000 per 100 ml |
| 2 Jun 2026, 10:33 | 410 | 410 per 100 ml |
| 20 May 2026, 12:50 | 3000 | 3000 per 100 ml |
| 24 Sep 2025, 13:05 | 530 | 530 per 100 ml |
| 12 Sep 2025, 12:11 | 5600 | 5600 per 100 ml |
| 8 Sep 2025, 11:07 | 480 | 480 per 100 ml |
| 28 Aug 2025, 11:16 | 570 | 570 per 100 ml |
| 26 Aug 2025, 13:08 | 200 | 200 per 100 ml |
| 22 Aug 2025, 10:55 | 330 | 330 per 100 ml |
| 13 Aug 2025, 14:18 | 280 | 280 per 100 ml |
| 10 Aug 2025, 11:05 | 360 | 360 per 100 ml |
| 28 Jul 2025, 11:04 | 660 | 660 per 100 ml |
| 25 Jul 2025, 13:04 | 240 | 240 per 100 ml |
| 15 Jul 2025, 14:00 | 430 | 430 per 100 ml |
| 10 Jul 2025, 11:26 | 280 | 280 per 100 ml |
| 26 Jun 2025, 12:22 | 990 | 990 per 100 ml |
| 16 Jun 2025, 11:03 | 2100 | 2100 per 100 ml |
| 30 May 2025, 12:40 | 1100 | 1100 per 100 ml |
| 27 May 2025, 13:52 | 3400 | 3400 per 100 ml |
| 12 May 2025, 10:32 | 81 | 81 per 100 ml |
Everything measured here
18 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 18 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 19 | Jun 2024 – Apr 2026 | 98.4% 15 Apr 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 19 | Jun 2024 – Apr 2026 | 11 mg/l 15 Apr 2026 |
| Temperature of Water 0076 | River water | 19 | Jun 2024 – Apr 2026 | 10.2 °C 15 Apr 2026 |
| pH 0061 | River water | 19 | Jun 2024 – Apr 2026 | 7.67 15 Apr 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 19 | Jun 2024 – Apr 2026 | below 0.03 mg/l 15 Apr 2026 |
| Nitrate as N 0117 | River water | 19 | Jun 2024 – Apr 2026 | 1.3 mg/l 15 Apr 2026 |
| Orthophosphate, reactive as P 0180 | River water | 19 | Jun 2024 – Apr 2026 | 0.014 mg/l 15 Apr 2026 |
| Conductivity at 25 C 0077 | River water | 19 | Jun 2024 – Apr 2026 | 149 µS/cm 15 Apr 2026 |
| Escherichia coli : Confirmed : MF 2348 | River water | 32 | May 2025 – Sep 2026 | 690 per 100 ml 17 Sep 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 19 | Jun 2024 – Apr 2026 | 41 mg/l 15 Apr 2026 |
| Ammonia un-ionised as N 0119 | River water | 19 | Jun 2024 – Apr 2026 | below 0.00026 mg/l 15 Apr 2026 |
| BOD : 5 Day ATU 0085 | River water | 19 | Jun 2024 – Apr 2026 | 1.6 mg/l 15 Apr 2026 |
| Enterococci: Intestinal: Confirmed: MF 3723 | River water | 32 | May 2025 – Sep 2026 | 380 colony forming units / 100ml 17 Sep 2026 |
| Enterococci: Intestinal: Presumptive: MF 3722 | River water | 32 | May 2025 – Sep 2026 | 420 colony forming units / 100ml 17 Sep 2026 |
| MST Filtration 4926 | River water | 32 | May 2025 – Sep 2026 | DNA Stored 17 Sep 2026 |
| Nitrite as N 0118 | River water | 19 | Jun 2024 – Apr 2026 | 0.0044 mg/l 15 Apr 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 19 | Jun 2024 – Apr 2026 | 1.3 mg/l 15 Apr 2026 |
| Volume of Sample Filtered 4865 | River water | 32 | May 2025 – Sep 2026 | 310 millilitre 17 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.