Mill Stream Minor Road Bridge Llwyntidmon Hall
EA name: MILL STRM MINOR RD BRG LLWYNTIDMON HALL (also listed as “MILL STREAM - AT THE MINOR ROAD BRIDGE LLWYNTIDMON HALL”)
Environment Agency sampling point MD-30702200 · 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, 12:4514 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 54 since 5 Oct 2023 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 329330, 320560As published, to the nearest 10 m. Open in a map
- River, by its own name
- Mill Stream
- River, by the map
- Not placedNearest line is 124 m away and its name does not agree. The river map cannot say which watercourse this is.
- Next gauge downstream
- Not known
- Why it was sampled
- Planned investigation (local monitoring) (32 samples)
Environmental monitoring statutory (EU directives) (18 samples)
Unplanned reactive monitoring (pollution incidents) (4 samples)
Results here were completed a median of 5 days after the sample was taken (3 to 13 days, 23 samples).
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
95.9%
Sampled 3 Sep 2026, 28 days ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Sep 2026, 14:39 | 95.9 | 95.9% |
| 1 Jul 2026, 12:47 | 98.2 | 98.2% |
| 28 May 2026, 12:30 | 105.6 | 105.6% |
| 15 Apr 2026, 12:36 | 99.9 | 99.9% |
| 13 Mar 2025, 12:41 | 99.4 | 99.4% |
| 19 Feb 2025, 11:35 | 99.3 | 99.3% |
| 31 Jan 2025, 15:09 | 97.1 | 97.1% |
| 4 Dec 2024, 08:08 | 91.4 | 91.4% |
| 5 Nov 2024, 12:15 | 95.3 | 95.3% |
| 31 Oct 2024, 09:38 | 92 | 92% |
| 3 Sep 2024, 14:40 | 90.6 | 90.6% |
| 6 Aug 2024, 12:21 | 101.3 | 101.3% |
| 9 Jul 2024, 13:22 | 86.7 | 86.7% |
| 18 Jun 2024, 12:01 | 98.5 | 98.5% |
| 6 Mar 2024, 12:12 | 95.4 | 95.4% |
| 5 Feb 2024, 11:42 | 94.6 | 94.6% |
| 12 Jan 2024, 12:55 | 93.8 | 93.8% |
| 21 Dec 2023, 13:52 | 95.5 | 95.5% |
| 17 Nov 2023, 12:35 | 91.4 | 91.4% |
| 5 Oct 2023, 12:14 | 88.4 | 88.4% |
Dissolved oxygen
as O2 · code 9924 · mg/l
9.11 mg/l
Sampled 3 Sep 2026, 28 days ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Sep 2026, 14:39 | 9.11 | 9.11 mg/l |
| 1 Jul 2026, 12:47 | 9.43 | 9.43 mg/l |
| 28 May 2026, 12:30 | 9.81 | 9.81 mg/l |
| 15 Apr 2026, 12:36 | 10.9 | 10.9 mg/l |
| 13 Mar 2025, 12:41 | 12 | 12 mg/l |
| 19 Feb 2025, 11:35 | 12.6 | 12.6 mg/l |
| 31 Jan 2025, 15:09 | 11.8 | 11.8 mg/l |
| 4 Dec 2024, 08:08 | 11.2 | 11.2 mg/l |
| 5 Nov 2024, 12:15 | 10.4 | 10.4 mg/l |
| 31 Oct 2024, 09:38 | 10 | 10 mg/l |
| 3 Sep 2024, 14:40 | 9 | 9 mg/l |
| 6 Aug 2024, 12:21 | 9.74 | 9.74 mg/l |
| 9 Jul 2024, 13:22 | 8.66 | 8.66 mg/l |
| 18 Jun 2024, 12:01 | 10.2 | 10.2 mg/l |
| 6 Mar 2024, 12:12 | 11.8 | 11.8 mg/l |
| 5 Feb 2024, 11:42 | 11.1 | 11.1 mg/l |
| 12 Jan 2024, 12:55 | 11.5 | 11.5 mg/l |
| 21 Dec 2023, 13:52 | 10.9 | 10.9 mg/l |
| 17 Nov 2023, 12:35 | 10.7 | 10.7 mg/l |
| 5 Oct 2023, 12:14 | 9.27 | 9.27 mg/l |
Water temperature
code 0076 · °C
17.7 °C
Sampled 3 Sep 2026, 28 days ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Sep 2026, 14:39 | 17.7 | 17.7 °C |
| 1 Jul 2026, 12:47 | 17.2 | 17.2 °C |
| 28 May 2026, 12:30 | 18.8 | 18.8 °C |
| 15 Apr 2026, 12:36 | 11.2 | 11.2 °C |
| 13 Mar 2025, 12:41 | 7.2 | 7.2 °C |
| 19 Feb 2025, 11:35 | 5.2 | 5.2 °C |
| 31 Jan 2025, 15:09 | 7 | 7 °C |
| 4 Dec 2024, 08:08 | 6.5 | 6.5 °C |
| 5 Nov 2024, 12:15 | 11.3 | 11.3 °C |
| 31 Oct 2024, 09:38 | 11.4 | 11.4 °C |
| 3 Sep 2024, 14:40 | 15.6 | 15.6 °C |
| 6 Aug 2024, 12:21 | 17.1 | 17.1 °C |
| 9 Jul 2024, 13:22 | 15.3 | 15.3 °C |
| 18 Jun 2024, 12:01 | 13.5 | 13.5 °C |
| 6 Mar 2024, 12:12 | 6.3 | 6.3 °C |
| 5 Feb 2024, 11:42 | 8.3 | 8.3 °C |
| 12 Jan 2024, 12:55 | 6.4 | 6.4 °C |
| 21 Dec 2023, 13:52 | 9.5 | 9.5 °C |
| 17 Nov 2023, 12:35 | 8.4 | 8.4 °C |
| 5 Oct 2023, 12:14 | 13.1 | 13.1 °C |
pH
code 0061
8.02
Sampled 3 Sep 2026, 28 days ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Sep 2026, 14:39 | 8.02 | 8.02 |
| 1 Jul 2026, 12:47 | 8.09 | 8.09 |
| 28 May 2026, 12:30 | 8.21 | 8.21 |
| 15 Apr 2026, 12:36 | 7.99 | 7.99 |
| 13 Mar 2025, 12:41 | 8.15 | 8.15 |
| 19 Feb 2025, 11:35 | 8.13 | 8.13 |
| 31 Jan 2025, 15:09 | 8.02 | 8.02 |
| 4 Dec 2024, 08:08 | 7.61 | 7.61 |
| 5 Nov 2024, 12:15 | 8 | 8 |
| 31 Oct 2024, 09:38 | 8.08 | 8.08 |
| 3 Sep 2024, 14:40 | 7.8 | 7.8 |
| 6 Aug 2024, 12:21 | 8.22 | 8.22 |
| 9 Jul 2024, 13:22 | 7.92 | 7.92 |
| 18 Jun 2024, 12:01 | 8.14 | 8.14 |
| 6 Mar 2024, 12:12 | 7.96 | 7.96 |
| 5 Feb 2024, 11:42 | 7.9 | 7.9 |
| 12 Jan 2024, 12:55 | 7.85 | 7.85 |
| 21 Dec 2023, 13:52 | 7.98 | 7.98 |
| 17 Nov 2023, 12:35 | 7.76 | 7.76 |
| 5 Oct 2023, 12:14 | 7.6 | 7.6 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 3 Sep 2026, 28 days ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Sep 2026, 14:39 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Jul 2026, 12:47 | 0.031 | 0.031 mg/l |
| 28 May 2026, 12:30 | <0.03 | below 0.03 mg/l (not detected above this) |
| 15 Apr 2026, 12:36 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 Mar 2025, 12:41 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 Feb 2025, 11:35 | <0.03 | below 0.03 mg/l (not detected above this) |
| 31 Jan 2025, 15:09 | 0.05 | 0.05 mg/l |
| 4 Dec 2024, 08:08 | 0.041 | 0.041 mg/l |
| 5 Nov 2024, 12:15 | <0.03 | below 0.03 mg/l (not detected above this) |
| 31 Oct 2024, 09:38 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Sep 2024, 14:40 | 0.054 | 0.054 mg/l |
| 6 Aug 2024, 12:21 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Jul 2024, 13:22 | 0.083 | 0.083 mg/l |
| 18 Jun 2024, 12:01 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 Mar 2024, 12:12 | 0.062 | 0.062 mg/l |
| 5 Feb 2024, 11:42 | 0.036 | 0.036 mg/l |
| 12 Jan 2024, 12:55 | 0.058 | 0.058 mg/l |
| 21 Dec 2023, 13:52 | 0.043 | 0.043 mg/l |
| 17 Nov 2023, 12:35 | 0.036 | 0.036 mg/l |
| 5 Oct 2023, 12:14 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
7.18 mg/l
Sampled 3 Sep 2026, 28 days ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Sep 2026, 14:39 | 7.18 | 7.18 mg/l |
| 1 Jul 2026, 12:47 | 5.87 | 5.87 mg/l |
| 28 May 2026, 12:30 | 5.97 | 5.97 mg/l |
| 15 Apr 2026, 12:36 | 3.49 | 3.49 mg/l |
| 13 Mar 2025, 12:41 | 4.59 | 4.59 mg/l |
| 19 Feb 2025, 11:35 | 3.99 | 3.99 mg/l |
| 31 Jan 2025, 15:09 | 3.88 | 3.88 mg/l |
| 4 Dec 2024, 08:08 | 3.49 | 3.49 mg/l |
| 5 Nov 2024, 12:15 | 3.89 | 3.89 mg/l |
| 31 Oct 2024, 09:38 | 3.69 | 3.69 mg/l |
| 3 Sep 2024, 14:40 | 2.98 | 2.98 mg/l |
| 6 Aug 2024, 12:21 | 4.88 | 4.88 mg/l |
| 9 Jul 2024, 13:22 | 3.17 | 3.17 mg/l |
| 18 Jun 2024, 12:01 | 3.09 | 3.09 mg/l |
| 6 Mar 2024, 12:12 | 4.27 | 4.27 mg/l |
| 5 Feb 2024, 11:42 | 4.47 | 4.47 mg/l |
| 12 Jan 2024, 12:55 | 4.47 | 4.47 mg/l |
| 21 Dec 2023, 13:52 | 4.07 | 4.07 mg/l |
| 17 Nov 2023, 12:35 | 3.88 | 3.88 mg/l |
| 5 Oct 2023, 12:14 | 3.29 | 3.29 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.062 mg/l
Sampled 3 Sep 2026, 28 days ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Sep 2026, 14:39 | 0.062 | 0.062 mg/l |
| 1 Jul 2026, 12:47 | 0.057 | 0.057 mg/l |
| 28 May 2026, 12:30 | 0.085 | 0.085 mg/l |
| 15 Apr 2026, 12:36 | 0.018 | 0.018 mg/l |
| 13 Mar 2025, 12:41 | 0.031 | 0.031 mg/l |
| 19 Feb 2025, 11:35 | 0.055 | 0.055 mg/l |
| 31 Jan 2025, 15:09 | 0.067 | 0.067 mg/l |
| 4 Dec 2024, 08:08 | 0.056 | 0.056 mg/l |
| 5 Nov 2024, 12:15 | 0.04 | 0.04 mg/l |
| 31 Oct 2024, 09:38 | 0.039 | 0.039 mg/l |
| 3 Sep 2024, 14:40 | 0.42 | 0.42 mg/l |
| 6 Aug 2024, 12:21 | 0.44 | 0.44 mg/l |
| 9 Jul 2024, 13:22 | 0.48 | 0.48 mg/l |
| 18 Jun 2024, 12:01 | 0.19 | 0.19 mg/l |
| 6 Mar 2024, 12:12 | 0.16 | 0.16 mg/l |
| 5 Feb 2024, 11:42 | 0.22 | 0.22 mg/l |
| 12 Jan 2024, 12:55 | 0.27 | 0.27 mg/l |
| 21 Dec 2023, 13:52 | 0.11 | 0.11 mg/l |
| 17 Nov 2023, 12:35 | 0.11 | 0.11 mg/l |
| 5 Oct 2023, 12:14 | 0.5 | 0.5 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
602 µS/cm
Sampled 3 Sep 2026, 28 days ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Sep 2026, 14:39 | 602 | 602 µS/cm |
| 1 Jul 2026, 12:47 | 599 | 599 µS/cm |
| 28 May 2026, 12:30 | 556 | 556 µS/cm |
| 15 Apr 2026, 12:36 | 395 | 395 µS/cm |
| 13 Mar 2025, 12:41 | 493 | 493 µS/cm |
| 19 Feb 2025, 11:35 | 437 | 437 µS/cm |
| 31 Jan 2025, 15:09 | 458 | 458 µS/cm |
| 4 Dec 2024, 08:08 | 433 | 433 µS/cm |
| 5 Nov 2024, 12:15 | 503 | 503 µS/cm |
| 31 Oct 2024, 09:38 | 455 | 455 µS/cm |
| 3 Sep 2024, 14:40 | 353 | 353 µS/cm |
| 6 Aug 2024, 12:21 | 470 | 470 µS/cm |
| 9 Jul 2024, 13:22 | 330 | 330 µS/cm |
| 18 Jun 2024, 12:01 | 397 | 397 µS/cm |
| 6 Mar 2024, 12:12 | 484 | 484 µS/cm |
| 5 Feb 2024, 11:42 | 491 | 491 µS/cm |
| 12 Jan 2024, 12:55 | 486 | 486 µS/cm |
| 21 Dec 2023, 13:52 | 482 | 482 µS/cm |
| 17 Nov 2023, 12:35 | 460 | 460 µS/cm |
| 5 Oct 2023, 12:14 | 335 | 335 µS/cm |
E. coli
confirmed, membrane filtration · code 2348 · per 100 ml
1300 per 100 ml
Sampled 17 Sep 2026, 14 days ago · 36 results banked
Every result (36)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Sep 2026, 12:45 | 1300 | 1300 per 100 ml |
| 8 Sep 2026, 13:21 | 3600 | 3600 per 100 ml |
| 3 Sep 2026, 14:39 | 3200 | 3200 per 100 ml |
| 27 Aug 2026, 13:40 | 3300 | 3300 per 100 ml |
| 23 Aug 2026, 11:40 | 570 | 570 per 100 ml |
| 19 Aug 2026, 10:42 | 950 | 950 per 100 ml |
| 11 Aug 2026, 10:54 | 620 | 620 per 100 ml |
| 5 Aug 2026, 13:27 | 2000 | 2000 per 100 ml |
| 28 Jul 2026, 14:17 | 1800 | 1800 per 100 ml |
| 22 Jul 2026, 13:49 | 820 | 820 per 100 ml |
| 7 Jul 2026, 10:06 | 1700 | 1700 per 100 ml |
| 1 Jul 2026, 12:47 | 11000 | 11000 per 100 ml |
| 19 Jun 2026, 13:20 | 790 | 790 per 100 ml |
| 10 Jun 2026, 12:25 | 910 | 910 per 100 ml |
| 2 Jun 2026, 10:07 | 7500 | 7500 per 100 ml |
| 26 May 2026, 12:50 | 610 | 610 per 100 ml |
| 20 May 2026, 13:24 | 1500 | 1500 per 100 ml |
| 24 Sep 2025, 13:27 | 1400 | 1400 per 100 ml |
| 12 Sep 2025, 12:28 | 1200 | 1200 per 100 ml |
| 8 Sep 2025, 11:23 | 9200 | 9200 per 100 ml |
| 28 Aug 2025, 10:56 | 6800 | 6800 per 100 ml |
| 26 Aug 2025, 12:52 | 1300 | 1300 per 100 ml |
| 22 Aug 2025, 11:10 | 2000 | 2000 per 100 ml |
| 13 Aug 2025, 14:35 | 1600 | 1600 per 100 ml |
| 10 Aug 2025, 11:24 | 930 | 930 per 100 ml |
| 28 Jul 2025, 10:53 | 2500 | 2500 per 100 ml |
| 25 Jul 2025, 12:47 | 930 | 930 per 100 ml |
| 15 Jul 2025, 13:41 | 2000 | 2000 per 100 ml |
| 13 Jul 2025, 12:23 | 2100 | 2100 per 100 ml |
| 10 Jul 2025, 11:10 | 1000 | 1000 per 100 ml |
| 26 Jun 2025, 12:05 | 2000 | 2000 per 100 ml |
| 16 Jun 2025, 11:18 | 190 | 190 per 100 ml |
| 10 Jun 2025, 12:31 | 980 | 980 per 100 ml |
| 30 May 2025, 12:22 | 630 | 630 per 100 ml |
| 27 May 2025, 13:01 | 10000 | 10000 per 100 ml |
| 12 May 2025, 10:15 | 1000 | 1000 per 100 ml |
Everything measured here
31 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 31 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 20 | Oct 2023 – Sep 2026 | 95.9% 3 Sep 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 20 | Oct 2023 – Sep 2026 | 9.11 mg/l 3 Sep 2026 |
| Temperature of Water 0076 | River water | 20 | Oct 2023 – Sep 2026 | 17.7 °C 3 Sep 2026 |
| pH 0061 | River water | 20 | Oct 2023 – Sep 2026 | 8.02 3 Sep 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 20 | Oct 2023 – Sep 2026 | below 0.03 mg/l 3 Sep 2026 |
| Nitrate as N 0117 | River water | 20 | Oct 2023 – Sep 2026 | 7.18 mg/l 3 Sep 2026 |
| Orthophosphate, reactive as P 0180 | River water | 20 | Oct 2023 – Sep 2026 | 0.062 mg/l 3 Sep 2026 |
| Conductivity at 25 C 0077 | River water | 20 | Oct 2023 – Sep 2026 | 602 µS/cm 3 Sep 2026 |
| Escherichia coli : Confirmed : MF 2348 | River water | 36 | May 2025 – Sep 2026 | 1300 per 100 ml 17 Sep 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 20 | Oct 2023 – Sep 2026 | 180 mg/l 3 Sep 2026 |
| Ammonia un-ionised as N 0119 | River water | 20 | Oct 2023 – Sep 2026 | below 0.00096 mg/l 3 Sep 2026 |
| Bacteroides HF183 primer 5886 | River water | 2 | May 2025 – Jul 2025 | Present / 100ml 13 Jul 2025 |
| Bacteroidetes Marker : Human copy number 3820 | River water | 2 | May 2025 – Jul 2025 | 3.4 log (10) gene copies / 100ml 13 Jul 2025 |
| Bacteroidetes Marker : Ruminant 4906 | River water | 2 | May 2025 – Jul 2025 | Present 13 Jul 2025 |
| Bacteroidetes Marker : Ruminant copy number 3819 | River water | 2 | May 2025 – Jul 2025 | 6.4 log (10) gene copies / 100ml 13 Jul 2025 |
| Enterococci: Intestinal: Confirmed: MF 3723 | River water | 36 | May 2025 – Sep 2026 | 680 colony forming units / 100ml 17 Sep 2026 |
| Enterococci: Intestinal: Presumptive: MF 3722 | River water | 36 | May 2025 – Sep 2026 | 680 colony forming units / 100ml 17 Sep 2026 |
| Microbial Source Tracking 4876 | River water | 2 | May 2025 – Jul 2025 | 1 text result 13 Jul 2025 |
| Mitochondrial Marker : Avian 4871 | River water | 1 | May 2025 – May 2025 | Not found 27 May 2025 |
| Mitochondrial Marker : Avian copy number 3817 | River water | 1 | May 2025 – May 2025 | below 2 log (10) gene copies / 100ml 27 May 2025 |
| Mitochondrial Marker : Cattle 4755 | River water | 1 | May 2025 – May 2025 | Present 27 May 2025 |
| Mitochondrial Marker : Cattle copy number 3789 | River water | 1 | May 2025 – May 2025 | 4.1 log (10) gene copies / 100ml 27 May 2025 |
| Mitochondrial Marker : Human 4869 | River water | 1 | May 2025 – May 2025 | Present 27 May 2025 |
| Mitochondrial Marker : Human copy number 3812 | River water | 1 | May 2025 – May 2025 | 3.7 log (10) gene copies / 100ml 27 May 2025 |
| Mitochondrial Marker : Sheep 4753 | River water | 1 | May 2025 – May 2025 | Present 27 May 2025 |
| Mitochondrial Marker : Sheep copy number 3778 | River water | 1 | May 2025 – May 2025 | 3.1 log (10) gene copies / 100ml 27 May 2025 |
| MST Filtration 4926 | River water | 36 | May 2025 – Sep 2026 | DNA Stored 17 Sep 2026 |
| Nitrite as N 0118 | River water | 20 | Oct 2023 – Sep 2026 | 0.021 mg/l 3 Sep 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 20 | Oct 2023 – Sep 2026 | 7.2 mg/l 3 Sep 2026 |
| Preparation: DNA 5923 | River water | 2 | May 2025 – Jul 2025 | Done 13 Jul 2025 |
| Volume of Sample Filtered 4865 | River water | 36 | May 2025 – Sep 2026 | 720 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.