Hay Dulas Brook at Hay on Wye
EA name: HAY DULAS BROOK AT HAY ON WYE
Environment Agency sampling point MD-H0000090 · 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
- 18 Mar 2025, 09:5418 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
- 13 since 4 Oct 2023 Imported periods: 1 Oct 2023 – 30 Sep 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Environmental monitoring statutory (EU directives)
- Where
- National Grid 323034, 242776As published, to the nearest 1 m. Open in a map
- River, by its own name
- Hay Dulas Brook
- River, by the map
- Dulas BrookPlaced on a river whose name partly matches its own, 4 m from the line.
- Next gauge downstream
- Bredwardine On the River Wye · 22 km along the river
- Why it was sampled
- Environmental monitoring statutory (EU directives) (13 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
102.3%
Sampled 18 Mar 2025, 18 months ago · 13 results banked
Every result (13)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 Mar 2025, 09:54 | 102.3 | 102.3% |
| 22 Jan 2025, 10:28 | 101.8 | 101.8% |
| 18 Nov 2024, 09:55 | 99 | 99% |
| 31 Oct 2024, 09:51 | 97.5 | 97.5% |
| 21 Aug 2024, 10:08 | 103.8 | 103.8% |
| 3 Jul 2024, 10:18 | 102.8 | 102.8% |
| 22 Apr 2024, 10:26 | 102.6 | 102.6% |
| 11 Mar 2024, 10:42 | 101.3 | 101.3% |
| 22 Feb 2024, 10:49 | 103.7 | 103.7% |
| 24 Jan 2024, 11:10 | 99.8 | 99.8% |
| 6 Dec 2023, 10:41 | 102.9 | 102.9% |
| 14 Nov 2023, 11:06 | 96.9 | 96.9% |
| 4 Oct 2023, 11:31 | 100.4 | 100.4% |
Dissolved oxygen
as O2 · code 9924 · mg/l
13.1 mg/l
Sampled 18 Mar 2025, 18 months ago · 13 results banked
Every result (13)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 Mar 2025, 09:54 | 13.1 | 13.1 mg/l |
| 22 Jan 2025, 10:28 | 13 | 13 mg/l |
| 18 Nov 2024, 09:55 | 11.6 | 11.6 mg/l |
| 31 Oct 2024, 09:51 | 10.7 | 10.7 mg/l |
| 21 Aug 2024, 10:08 | 10.9 | 10.9 mg/l |
| 3 Jul 2024, 10:18 | 10.9 | 10.9 mg/l |
| 22 Apr 2024, 10:26 | 12.1 | 12.1 mg/l |
| 11 Mar 2024, 10:42 | 12.2 | 12.2 mg/l |
| 22 Feb 2024, 10:49 | 12.4 | 12.4 mg/l |
| 24 Jan 2024, 11:10 | 11.8 | 11.8 mg/l |
| 6 Dec 2023, 10:41 | 13 | 13 mg/l |
| 14 Nov 2023, 11:06 | 10.9 | 10.9 mg/l |
| 4 Oct 2023, 11:31 | 10.7 | 10.7 mg/l |
Water temperature
code 0076 · °C
4.7 °C
Sampled 18 Mar 2025, 18 months ago · 13 results banked
Every result (13)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 Mar 2025, 09:54 | 4.7 | 4.7 °C |
| 22 Jan 2025, 10:28 | 4.9 | 4.9 °C |
| 18 Nov 2024, 09:55 | 8.4 | 8.4 °C |
| 31 Oct 2024, 09:51 | 11.2 | 11.2 °C |
| 21 Aug 2024, 10:08 | 13.2 | 13.2 °C |
| 3 Jul 2024, 10:18 | 12.6 | 12.6 °C |
| 22 Apr 2024, 10:26 | 8.1 | 8.1 °C |
| 11 Mar 2024, 10:42 | 7.3 | 7.3 °C |
| 22 Feb 2024, 10:49 | 7.4 | 7.4 °C |
| 24 Jan 2024, 11:10 | 8.1 | 8.1 °C |
| 6 Dec 2023, 10:41 | 5.5 | 5.5 °C |
| 14 Nov 2023, 11:06 | 10 | 10 °C |
| 4 Oct 2023, 11:31 | 12.4 | 12.4 °C |
pH
code 0061
8.02
Sampled 18 Mar 2025, 18 months ago · 13 results banked
Every result (13)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 Mar 2025, 09:54 | 8.02 | 8.02 |
| 22 Jan 2025, 10:28 | 8.37 | 8.37 |
| 18 Nov 2024, 09:55 | 8.28 | 8.28 |
| 31 Oct 2024, 09:51 | 7.55 | 7.55 |
| 21 Aug 2024, 10:08 | 8.35 | 8.35 |
| 3 Jul 2024, 10:18 | 8.05 | 8.05 |
| 22 Apr 2024, 10:26 | 8.32 | 8.32 |
| 11 Mar 2024, 10:42 | 8.35 | 8.35 |
| 22 Feb 2024, 10:49 | 7.36 | 7.36 |
| 24 Jan 2024, 11:10 | 8.04 | 8.04 |
| 6 Dec 2023, 10:41 | 7.74 | 7.74 |
| 14 Nov 2023, 11:06 | 8.15 | 8.15 |
| 4 Oct 2023, 11:31 | 8.3 | 8.3 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 18 Mar 2025, 18 months ago · 13 results banked
Every result (13)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 Mar 2025, 09:54 | <0.03 | below 0.03 mg/l (not detected above this) |
| 22 Jan 2025, 10:28 | <0.03 | below 0.03 mg/l (not detected above this) |
| 18 Nov 2024, 09:55 | <0.03 | below 0.03 mg/l (not detected above this) |
| 31 Oct 2024, 09:51 | <0.03 | below 0.03 mg/l (not detected above this) |
| 21 Aug 2024, 10:08 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Jul 2024, 10:18 | <0.03 | below 0.03 mg/l (not detected above this) |
| 22 Apr 2024, 10:26 | <0.03 | below 0.03 mg/l (not detected above this) |
| 11 Mar 2024, 10:42 | 0.032 | 0.032 mg/l |
| 22 Feb 2024, 10:49 | <0.03 | below 0.03 mg/l (not detected above this) |
| 24 Jan 2024, 11:10 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 Dec 2023, 10:41 | <0.03 | below 0.03 mg/l (not detected above this) |
| 14 Nov 2023, 11:06 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Oct 2023, 11:31 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
1.6 mg/l
Sampled 18 Mar 2025, 18 months ago · 13 results banked
Every result (13)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 Mar 2025, 09:54 | 1.6 | 1.6 mg/l |
| 22 Jan 2025, 10:28 | 1.8 | 1.8 mg/l |
| 18 Nov 2024, 09:55 | 1.7 | 1.7 mg/l |
| 31 Oct 2024, 09:51 | 1.4 | 1.4 mg/l |
| 21 Aug 2024, 10:08 | 1.6 | 1.6 mg/l |
| 3 Jul 2024, 10:18 | 1.7 | 1.7 mg/l |
| 22 Apr 2024, 10:26 | 1.7 | 1.7 mg/l |
| 11 Mar 2024, 10:42 | 1.4 | 1.4 mg/l |
| 22 Feb 2024, 10:49 | 0.846 | 0.846 mg/l |
| 24 Jan 2024, 11:10 | 1.6 | 1.6 mg/l |
| 6 Dec 2023, 10:41 | 1.3 | 1.3 mg/l |
| 14 Nov 2023, 11:06 | 0.996 | 0.996 mg/l |
| 4 Oct 2023, 11:31 | 0.746 | 0.746 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.66 mg/l
Sampled 18 Mar 2025, 18 months ago · 13 results banked
Every result (13)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 Mar 2025, 09:54 | 0.66 | 0.66 mg/l |
| 22 Jan 2025, 10:28 | 0.021 | 0.021 mg/l |
| 18 Nov 2024, 09:55 | 0.027 | 0.027 mg/l |
| 31 Oct 2024, 09:51 | 0.8 | 0.8 mg/l |
| 21 Aug 2024, 10:08 | 0.032 | 0.032 mg/l |
| 3 Jul 2024, 10:18 | 0.031 | 0.031 mg/l |
| 22 Apr 2024, 10:26 | 0.011 | 0.011 mg/l |
| 11 Mar 2024, 10:42 | 0.016 | 0.016 mg/l |
| 22 Feb 2024, 10:49 | 0.041 | 0.041 mg/l |
| 24 Jan 2024, 11:10 | 0.024 | 0.024 mg/l |
| 6 Dec 2023, 10:41 | 0.017 | 0.017 mg/l |
| 14 Nov 2023, 11:06 | 0.021 | 0.021 mg/l |
| 4 Oct 2023, 11:31 | 0.017 | 0.017 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
410 µS/cm
Sampled 18 Mar 2025, 18 months ago · 13 results banked
Every result (13)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 Mar 2025, 09:54 | 410 | 410 µS/cm |
| 22 Jan 2025, 10:28 | 405 | 405 µS/cm |
| 18 Nov 2024, 09:55 | 411 | 411 µS/cm |
| 31 Oct 2024, 09:51 | 379 | 379 µS/cm |
| 21 Aug 2024, 10:08 | 444 | 444 µS/cm |
| 3 Jul 2024, 10:18 | 440 | 440 µS/cm |
| 22 Apr 2024, 10:26 | 404 | 404 µS/cm |
| 11 Mar 2024, 10:42 | 290 | 290 µS/cm |
| 22 Feb 2024, 10:49 | 194 | 194 µS/cm |
| 24 Jan 2024, 11:10 | 345 | 345 µS/cm |
| 6 Dec 2023, 10:41 | 300 | 300 µS/cm |
| 14 Nov 2023, 11:06 | 282 | 282 µS/cm |
| 4 Oct 2023, 11:31 | 326 | 326 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 | 13 | Oct 2023 – Mar 2025 | 102.3% 18 Mar 2025 |
| Oxygen, Dissolved as O2 9924 | River water | 13 | Oct 2023 – Mar 2025 | 13.1 mg/l 18 Mar 2025 |
| Temperature of Water 0076 | River water | 13 | Oct 2023 – Mar 2025 | 4.7 °C 18 Mar 2025 |
| pH 0061 | River water | 13 | Oct 2023 – Mar 2025 | 8.02 18 Mar 2025 |
| Ammoniacal Nitrogen as N 0111 | River water | 13 | Oct 2023 – Mar 2025 | below 0.03 mg/l 18 Mar 2025 |
| Nitrate as N 0117 | River water | 13 | Oct 2023 – Mar 2025 | 1.6 mg/l 18 Mar 2025 |
| Orthophosphate, reactive as P 0180 | River water | 13 | Oct 2023 – Mar 2025 | 0.66 mg/l 18 Mar 2025 |
| Conductivity at 25 C 0077 | River water | 13 | Oct 2023 – Mar 2025 | 410 µS/cm 18 Mar 2025 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 13 | Oct 2023 – Mar 2025 | 190 mg/l 18 Mar 2025 |
| Ammonia un-ionised as N 0119 | River water | 13 | Oct 2023 – Mar 2025 | below 0.00037 mg/l 18 Mar 2025 |
| Nitrite as N 0118 | River water | 13 | Oct 2023 – Mar 2025 | below 0.004 mg/l 18 Mar 2025 |
| Nitrogen, Total Oxidised as N 0116 | River water | 13 | Oct 2023 – Mar 2025 | 1.6 mg/l 18 Mar 2025 |
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.