River Yarrow at SD472187
EA name: RIVER YARROW AT SD472187
Environment Agency sampling point NW-88023121 · 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 May 2026, 12:374 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
- 35 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 Monitoring (national agency policy)
- Where
- National Grid 347224, 418702As published, to the nearest 1 m. Open in a map
- River, by its own name
- Yarrow
- River, by the map
- River YarrowPlaced on the river its name gives, 3 m from the line. A tidal reach: water runs both ways, so no gauge order is claimed.
- Next gauge downstream
- Not known
- Why it was sampled
- Monitoring (national agency policy) (22 samples)
Planned investigation (local monitoring) (13 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
103.3%
Sampled 18 May 2026, 4 months ago · 22 results banked
Every result (22)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 May 2026, 12:37 | 103.3 | 103.3% |
| 24 Mar 2026, 14:22 | 94 | 94% |
| 20 Feb 2026, 10:51 | 95.9 | 95.9% |
| 12 Jan 2026, 10:27 | 96.6 | 96.6% |
| 4 Dec 2025, 09:43 | 96.1 | 96.1% |
| 11 Nov 2025, 10:53 | 90.6 | 90.6% |
| 29 Oct 2025, 14:23 | 85.3 | 85.3% |
| 24 Oct 2025, 12:39 | 89.7 | 89.7% |
| 25 Sep 2025, 09:25 | 91.6 | 91.6% |
| 22 Aug 2025, 12:33 | 75.4 | 75.4% |
| 20 May 2025, 10:11 | 116.2 | 116.2% |
| 22 Apr 2025, 10:09 | 104.8 | 104.8% |
| 26 Mar 2025, 09:45 | 95.2 | 95.2% |
| 21 Feb 2025, 09:21 | 95.4 | 95.4% |
| 28 Jan 2025, 15:40 | 95.8 | 95.8% |
| 17 Dec 2024, 12:40 | 86.5 | 86.5% |
| 13 Dec 2024, 10:00 | 94.8 | 94.8% |
| 26 Nov 2024, 10:00 | 92.5 | 92.5% |
| 18 Nov 2024, 13:00 | 89.6 | 89.6% |
| 31 Oct 2024, 10:14 | 93.7 | 93.7% |
| 23 Oct 2024, 14:57 | 96.5 | 96.5% |
| 30 Jul 2024, 11:26 | 108 | 108% |
Dissolved oxygen
as O2 · code 9924 · mg/l
10.9 mg/l
Sampled 18 May 2026, 4 months ago · 22 results banked
Every result (22)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 May 2026, 12:37 | 10.9 | 10.9 mg/l |
| 24 Mar 2026, 14:22 | 10.4 | 10.4 mg/l |
| 20 Feb 2026, 10:51 | 12 | 12 mg/l |
| 12 Jan 2026, 10:27 | 11.7 | 11.7 mg/l |
| 4 Dec 2025, 09:43 | 11.6 | 11.6 mg/l |
| 11 Nov 2025, 10:53 | 10 | 10 mg/l |
| 29 Oct 2025, 14:23 | 9.34 | 9.34 mg/l |
| 24 Oct 2025, 12:39 | 9.89 | 9.89 mg/l |
| 25 Sep 2025, 09:25 | 10 | 10 mg/l |
| 22 Aug 2025, 12:33 | 7.3 | 7.3 mg/l |
| 20 May 2025, 10:11 | 11.8 | 11.8 mg/l |
| 22 Apr 2025, 10:09 | 11.5 | 11.5 mg/l |
| 26 Mar 2025, 09:45 | 10.9 | 10.9 mg/l |
| 21 Feb 2025, 09:21 | 10.9 | 10.9 mg/l |
| 28 Jan 2025, 15:40 | 11.6 | 11.6 mg/l |
| 17 Dec 2024, 12:40 | 10 | 10 mg/l |
| 13 Dec 2024, 10:00 | 11.4 | 11.4 mg/l |
| 26 Nov 2024, 10:00 | 11.1 | 11.1 mg/l |
| 18 Nov 2024, 13:00 | 10.6 | 10.6 mg/l |
| 31 Oct 2024, 10:14 | 10 | 10 mg/l |
| 23 Oct 2024, 14:57 | 10.4 | 10.4 mg/l |
| 30 Jul 2024, 11:26 | 10.2 | 10.2 mg/l |
Water temperature
code 0076 · °C
12.9 °C
Sampled 18 May 2026, 4 months ago · 22 results banked
Every result (22)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 May 2026, 12:37 | 12.9 | 12.9 °C |
| 24 Mar 2026, 14:22 | 10.6 | 10.6 °C |
| 20 Feb 2026, 10:51 | 5.8 | 5.8 °C |
| 12 Jan 2026, 10:27 | 6.9 | 6.9 °C |
| 4 Dec 2025, 09:43 | 7.2 | 7.2 °C |
| 11 Nov 2025, 10:53 | 10.8 | 10.8 °C |
| 29 Oct 2025, 14:23 | 11.2 | 11.2 °C |
| 24 Oct 2025, 12:39 | 10.9 | 10.9 °C |
| 25 Sep 2025, 09:25 | 11.2 | 11.2 °C |
| 22 Aug 2025, 12:33 | 16.8 | 16.8 °C |
| 20 May 2025, 10:11 | 14.6 | 14.6 °C |
| 22 Apr 2025, 10:09 | 11.3 | 11.3 °C |
| 26 Mar 2025, 09:45 | 9.3 | 9.3 °C |
| 21 Feb 2025, 09:21 | 9.6 | 9.6 °C |
| 28 Jan 2025, 15:40 | 6.9 | 6.9 °C |
| 17 Dec 2024, 12:40 | 8.8 | 8.8 °C |
| 13 Dec 2024, 10:00 | 7.2 | 7.2 °C |
| 26 Nov 2024, 10:00 | 7.5 | 7.5 °C |
| 18 Nov 2024, 13:00 | 7.8 | 7.8 °C |
| 31 Oct 2024, 10:14 | 12.2 | 12.2 °C |
| 23 Oct 2024, 14:57 | 11.8 | 11.8 °C |
| 30 Jul 2024, 11:26 | 17.9 | 17.9 °C |
pH
code 0061
8.24
Sampled 18 May 2026, 4 months ago · 22 results banked
Every result (22)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 May 2026, 12:37 | 8.24 | 8.24 |
| 24 Mar 2026, 14:22 | 7.95 | 7.95 |
| 20 Feb 2026, 10:51 | 7.79 | 7.79 |
| 12 Jan 2026, 10:27 | 7.9 | 7.9 |
| 4 Dec 2025, 09:43 | 7.72 | 7.72 |
| 11 Nov 2025, 10:53 | 7.77 | 7.77 |
| 29 Oct 2025, 14:23 | 7.46 | 7.46 |
| 24 Oct 2025, 12:39 | 7.85 | 7.85 |
| 25 Sep 2025, 09:25 | 7.85 | 7.85 |
| 22 Aug 2025, 12:33 | 8.07 | 8.07 |
| 20 May 2025, 10:11 | 8.32 | 8.32 |
| 22 Apr 2025, 10:09 | 8.05 | 8.05 |
| 26 Mar 2025, 09:45 | 7.97 | 7.97 |
| 21 Feb 2025, 09:21 | 7.77 | 7.77 |
| 28 Jan 2025, 15:40 | 7.75 | 7.75 |
| 17 Dec 2024, 12:40 | 7.61 | 7.61 |
| 13 Dec 2024, 10:00 | 7.88 | 7.88 |
| 26 Nov 2024, 10:00 | 7.6 | 7.6 |
| 18 Nov 2024, 13:00 | 7.69 | 7.69 |
| 31 Oct 2024, 10:14 | 7.72 | 7.72 |
| 23 Oct 2024, 14:57 | 7.78 | 7.78 |
| 30 Jul 2024, 11:26 | 8.25 | 8.25 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.18 mg/l
Sampled 18 May 2026, 4 months ago · 22 results banked
Every result (22)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 May 2026, 12:37 | 0.18 | 0.18 mg/l |
| 24 Mar 2026, 14:22 | 0.55 | 0.55 mg/l |
| 20 Feb 2026, 10:51 | 0.2 | 0.2 mg/l |
| 12 Jan 2026, 10:27 | 0.43 | 0.43 mg/l |
| 4 Dec 2025, 09:43 | 0.13 | 0.13 mg/l |
| 11 Nov 2025, 10:53 | 0.22 | 0.22 mg/l |
| 29 Oct 2025, 14:23 | 0.51 | 0.51 mg/l |
| 24 Oct 2025, 12:39 | 0.34 | 0.34 mg/l |
| 25 Sep 2025, 09:25 | 0.19 | 0.19 mg/l |
| 22 Aug 2025, 12:33 | 0.17 | 0.17 mg/l |
| 20 May 2025, 10:11 | 0.32 | 0.32 mg/l |
| 22 Apr 2025, 10:09 | 0.83 | 0.83 mg/l |
| 26 Mar 2025, 09:45 | 0.2 | 0.2 mg/l |
| 21 Feb 2025, 09:21 | 0.25 | 0.25 mg/l |
| 28 Jan 2025, 15:40 | 0.25 | 0.25 mg/l |
| 17 Dec 2024, 12:40 | 0.22 | 0.22 mg/l |
| 13 Dec 2024, 10:00 | 0.16 | 0.16 mg/l |
| 26 Nov 2024, 10:00 | 0.13 | 0.13 mg/l |
| 18 Nov 2024, 13:00 | 0.1 | 0.1 mg/l |
| 31 Oct 2024, 10:14 | 0.15 | 0.15 mg/l |
| 23 Oct 2024, 14:57 | 0.14 | 0.14 mg/l |
| 30 Jul 2024, 11:26 | 0.16 | 0.16 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
5.34 mg/l
Sampled 18 May 2026, 4 months ago · 22 results banked
Every result (22)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 May 2026, 12:37 | 5.34 | 5.34 mg/l |
| 24 Mar 2026, 14:22 | 4.55 | 4.55 mg/l |
| 20 Feb 2026, 10:51 | 4.07 | 4.07 mg/l |
| 12 Jan 2026, 10:27 | 3.26 | 3.26 mg/l |
| 4 Dec 2025, 09:43 | 2.88 | 2.88 mg/l |
| 11 Nov 2025, 10:53 | 2.68 | 2.68 mg/l |
| 29 Oct 2025, 14:23 | 3.97 | 3.97 mg/l |
| 24 Oct 2025, 12:39 | 4.47 | 4.47 mg/l |
| 25 Sep 2025, 09:25 | 5.46 | 5.46 mg/l |
| 22 Aug 2025, 12:33 | 11.9 | 11.9 mg/l |
| 20 May 2025, 10:11 | 11.9 | 11.9 mg/l |
| 22 Apr 2025, 10:09 | 10.9 | 10.9 mg/l |
| 26 Mar 2025, 09:45 | 7.26 | 7.26 mg/l |
| 21 Feb 2025, 09:21 | 4.14 | 4.14 mg/l |
| 28 Jan 2025, 15:40 | 2.57 | 2.57 mg/l |
| 17 Dec 2024, 12:40 | 6.55 | 6.55 mg/l |
| 13 Dec 2024, 10:00 | 3.57 | 3.57 mg/l |
| 26 Nov 2024, 10:00 | 1.78 | 1.78 mg/l |
| 18 Nov 2024, 13:00 | 2.96 | 2.96 mg/l |
| 31 Oct 2024, 10:14 | 2.97 | 2.97 mg/l |
| 23 Oct 2024, 14:57 | 2.77 | 2.77 mg/l |
| 30 Jul 2024, 11:26 | 7.35 | 7.35 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.31 mg/l
Sampled 18 May 2026, 4 months ago · 22 results banked
Every result (22)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 May 2026, 12:37 | 0.31 | 0.31 mg/l |
| 24 Mar 2026, 14:22 | 0.23 | 0.23 mg/l |
| 20 Feb 2026, 10:51 | 0.19 | 0.19 mg/l |
| 12 Jan 2026, 10:27 | 0.18 | 0.18 mg/l |
| 4 Dec 2025, 09:43 | 0.15 | 0.15 mg/l |
| 11 Nov 2025, 10:53 | 0.18 | 0.18 mg/l |
| 29 Oct 2025, 14:23 | 0.21 | 0.21 mg/l |
| 24 Oct 2025, 12:39 | 0.23 | 0.23 mg/l |
| 25 Sep 2025, 09:25 | 0.27 | 0.27 mg/l |
| 22 Aug 2025, 12:33 | 3.6 | 3.6 mg/l |
| 20 May 2025, 10:11 | 0.76 | 0.76 mg/l |
| 22 Apr 2025, 10:09 | 0.52 | 0.52 mg/l |
| 26 Mar 2025, 09:45 | 0.24 | 0.24 mg/l |
| 21 Feb 2025, 09:21 | 0.25 | 0.25 mg/l |
| 28 Jan 2025, 15:40 | 0.17 | 0.17 mg/l |
| 17 Dec 2024, 12:40 | 0.72 | 0.72 mg/l |
| 13 Dec 2024, 10:00 | 0.14 | 0.14 mg/l |
| 26 Nov 2024, 10:00 | 0.18 | 0.18 mg/l |
| 18 Nov 2024, 13:00 | 0.29 | 0.29 mg/l |
| 31 Oct 2024, 10:14 | 0.25 | 0.25 mg/l |
| 23 Oct 2024, 14:57 | 0.21 | 0.21 mg/l |
| 30 Jul 2024, 11:26 | 1 | 1 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
619 µS/cm
Sampled 18 May 2026, 4 months ago · 22 results banked
Every result (22)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 May 2026, 12:37 | 619 | 619 µS/cm |
| 24 Mar 2026, 14:22 | 506 | 506 µS/cm |
| 20 Feb 2026, 10:51 | 467 | 467 µS/cm |
| 12 Jan 2026, 10:27 | 603 | 603 µS/cm |
| 4 Dec 2025, 09:43 | 400 | 400 µS/cm |
| 11 Nov 2025, 10:53 | 409 | 409 µS/cm |
| 29 Oct 2025, 14:23 | 404 | 404 µS/cm |
| 24 Oct 2025, 12:39 | 525 | 525 µS/cm |
| 25 Sep 2025, 09:25 | 585 | 585 µS/cm |
| 22 Aug 2025, 12:33 | 1092 | 1092 µS/cm |
| 20 May 2025, 10:11 | 776 | 776 µS/cm |
| 22 Apr 2025, 10:09 | 709 | 709 µS/cm |
| 26 Mar 2025, 09:45 | 697 | 697 µS/cm |
| 21 Feb 2025, 09:21 | 548 | 548 µS/cm |
| 28 Jan 2025, 15:40 | 435 | 435 µS/cm |
| 17 Dec 2024, 12:40 | 559 | 559 µS/cm |
| 13 Dec 2024, 10:00 | 425 | 425 µS/cm |
| 26 Nov 2024, 10:00 | 313 | 313 µS/cm |
| 18 Nov 2024, 13:00 | 408 | 408 µS/cm |
| 31 Oct 2024, 10:14 | 405 | 405 µS/cm |
| 23 Oct 2024, 14:57 | 401 | 401 µS/cm |
| 30 Jul 2024, 11:26 | 651 | 651 µS/cm |
E. coli
confirmed, membrane filtration · code 2348 · per 100 ml
1600 per 100 ml
Sampled 26 Mar 2025, 18 months ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 26 Mar 2025, 09:45 | 1600 | 1600 per 100 ml |
| 21 Feb 2025, 09:21 | 28000 | 28000 per 100 ml |
| 28 Jan 2025, 15:40 | 9200 | 9200 per 100 ml |
| 17 Dec 2024, 12:40 | 2100 | 2100 per 100 ml |
| 13 Dec 2024, 10:00 | 1200 | 1200 per 100 ml |
| 26 Nov 2024, 10:00 | 15000 | 15000 per 100 ml |
| 18 Nov 2024, 13:00 | 5200 | 5200 per 100 ml |
| 31 Oct 2024, 10:14 | 1300 | 1300 per 100 ml |
| 23 Oct 2024, 14:57 | 1300 | 1300 per 100 ml |
| 30 Jul 2024, 11:26 | 2600 | 2600 per 100 ml |
| 8 May 2024, 10:50 | 2300 | 2300 per 100 ml |
| 23 Apr 2024, 11:10 | 2200 | 2200 per 100 ml |
| 14 Mar 2024, 11:02 | 15000 | 15000 per 100 ml |
| 15 Feb 2024, 14:35 | 16000 | 16000 per 100 ml |
| 15 Feb 2024, 14:30 | 10000 | 10000 per 100 ml |
| 26 Jan 2024, 10:46 | 6700 | 6700 per 100 ml |
| 26 Jan 2024, 10:45 | 6800 | 6800 per 100 ml |
| 13 Dec 2023, 10:01 | 4900 | 4900 per 100 ml |
| 6 Dec 2023, 12:00 | 2700 | 2700 per 100 ml |
| 15 Nov 2023, 09:26 | 2000 | 2000 per 100 ml |
| 25 Oct 2023, 12:29 | 930 | 930 per 100 ml |
| 6 Oct 2023, 12:44 | 46000 | 46000 per 100 ml |
| 5 Oct 2023, 09:28 | 16000 | 16000 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 | 22 | Jul 2024 – May 2026 | 103.3% 18 May 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 22 | Jul 2024 – May 2026 | 10.9 mg/l 18 May 2026 |
| Temperature of Water 0076 | River water | 22 | Jul 2024 – May 2026 | 12.9 °C 18 May 2026 |
| pH 0061 | River water | 22 | Jul 2024 – May 2026 | 8.24 18 May 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 22 | Jul 2024 – May 2026 | 0.18 mg/l 18 May 2026 |
| Nitrate as N 0117 | River water | 22 | Jul 2024 – May 2026 | 5.34 mg/l 18 May 2026 |
| Orthophosphate, reactive as P 0180 | River water | 22 | Jul 2024 – May 2026 | 0.31 mg/l 18 May 2026 |
| Conductivity at 25 C 0077 | River water | 22 | Jul 2024 – May 2026 | 619 µS/cm 18 May 2026 |
| Escherichia coli : Confirmed : MF 2348 | River water | 23 | Oct 2023 – Mar 2025 | 1600 per 100 ml 26 Mar 2025 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 22 | Jul 2024 – May 2026 | 160 mg/l 18 May 2026 |
| Ammonia un-ionised as N 0119 | River water | 22 | Jul 2024 – May 2026 | 0.00406 mg/l 18 May 2026 |
| BOD : 5 Day ATU 0085 | River water | 22 | Jul 2024 – May 2026 | below 3 mg/l 18 May 2026 |
| Enterococci: Intestinal: Confirmed: MF 3723 | River water | 23 | Oct 2023 – Mar 2025 | 300 colony forming units / 100ml 26 Mar 2025 |
| Enterococci: Intestinal: Presumptive: MF 3722 | River water | 23 | Oct 2023 – Mar 2025 | 300 colony forming units / 100ml 26 Mar 2025 |
| MST Filtration 4926 | River water | 23 | Oct 2023 – Mar 2025 | DNA Stored 26 Mar 2025 |
| Nitrite as N 0118 | River water | 22 | Jul 2024 – May 2026 | 0.056 mg/l 18 May 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 22 | Jul 2024 – May 2026 | 5.4 mg/l 18 May 2026 |
| Volume of Sample Filtered 4865 | River water | 23 | Oct 2023 – Mar 2025 | 930 millilitre 26 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.