Wey (North) at Hatch Mill, Farnham
EA name: WEY ( NORTH ) AT HATCH MILL, FARNHAM
Environment Agency sampling point TH-PWER0022 · 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
- 12 Mar 2026, 13:157 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
- 28 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 484560, 147030As published, to the nearest 10 m. Open in a map
- River, by its own name
- Wey
- River, by the map
- River Wey (North Branch)Placed on the river its name gives, 1 m from the line.
- Next gauge downstream
- Tilford On the River Wey · 8.6 km along the river
- Nearest gauge upstream
- Farnham On the River Wey · 1.3 km along the river
- Why it was sampled
- Environmental monitoring statutory (EU directives) (28 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
106.6%
Sampled 12 Mar 2026, 7 months ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Mar 2026, 13:15 | 106.6 | 106.6% |
| 4 Feb 2026, 10:26 | 94.1 | 94.1% |
| 8 Jan 2026, 12:41 | 97.2 | 97.2% |
| 10 Dec 2025, 11:16 | 92.6 | 92.6% |
| 24 Nov 2025, 12:52 | 98.3 | 98.3% |
| 13 Oct 2025, 12:46 | 95.7 | 95.7% |
| 2 Sep 2025, 11:19 | 93.1 | 93.1% |
| 1 Aug 2025, 16:09 | 104.4 | 104.4% |
| 15 Jul 2025, 15:16 | 110.2 | 110.2% |
| 3 Jun 2025, 13:28 | 97.2 | 97.2% |
| 12 May 2025, 14:43 | 104.7 | 104.7% |
| 3 Apr 2025, 11:56 | 121 | 121% |
| 3 Mar 2025, 10:50 | 99.8 | 99.8% |
| 3 Feb 2025, 11:35 | 97.6 | 97.6% |
| 13 Jan 2025, 10:19 | 99.5 | 99.5% |
| 6 Dec 2024, 12:03 | 97.3 | 97.3% |
| 5 Nov 2024, 11:53 | 97.8 | 97.8% |
| 11 Oct 2024, 14:23 | 99 | 99% |
| 20 Sep 2024, 13:31 | 94.3 | 94.3% |
| 22 Aug 2024, 14:06 | 98.2 | 98.2% |
| 4 Jul 2024, 10:32 | 103.2 | 103.2% |
| 6 Jun 2024, 10:23 | 100 | 100% |
| 5 Mar 2024, 11:47 | 100 | 100% |
| 7 Feb 2024, 11:34 | 98 | 98% |
| 3 Jan 2024, 13:08 | 89.6 | 89.6% |
| 6 Dec 2023, 11:20 | 97.5 | 97.5% |
| 8 Nov 2023, 12:23 | 95.6 | 95.6% |
| 4 Oct 2023, 10:11 | 95.8 | 95.8% |
Dissolved oxygen
as O2 · code 9924 · mg/l
12.1 mg/l
Sampled 12 Mar 2026, 7 months ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Mar 2026, 13:15 | 12.1 | 12.1 mg/l |
| 4 Feb 2026, 10:26 | 11.3 | 11.3 mg/l |
| 8 Jan 2026, 12:41 | 12 | 12 mg/l |
| 10 Dec 2025, 11:16 | 10.4 | 10.4 mg/l |
| 24 Nov 2025, 12:52 | 11.7 | 11.7 mg/l |
| 13 Oct 2025, 12:46 | 10.2 | 10.2 mg/l |
| 2 Sep 2025, 11:19 | 9.36 | 9.36 mg/l |
| 1 Aug 2025, 16:09 | 9.84 | 9.84 mg/l |
| 15 Jul 2025, 15:16 | 10.2 | 10.2 mg/l |
| 3 Jun 2025, 13:28 | 9.84 | 9.84 mg/l |
| 12 May 2025, 14:43 | 10.2 | 10.2 mg/l |
| 3 Apr 2025, 11:56 | 13.2 | 13.2 mg/l |
| 3 Mar 2025, 10:50 | 12.1 | 12.1 mg/l |
| 3 Feb 2025, 11:35 | 11.9 | 11.9 mg/l |
| 13 Jan 2025, 10:19 | 12.1 | 12.1 mg/l |
| 6 Dec 2024, 12:03 | 11.3 | 11.3 mg/l |
| 5 Nov 2024, 11:53 | 10.8 | 10.8 mg/l |
| 11 Oct 2024, 14:23 | 10.8 | 10.8 mg/l |
| 20 Sep 2024, 13:31 | 9.24 | 9.24 mg/l |
| 22 Aug 2024, 14:06 | 9.71 | 9.71 mg/l |
| 4 Jul 2024, 10:32 | 10.4 | 10.4 mg/l |
| 6 Jun 2024, 10:23 | 10.5 | 10.5 mg/l |
| 5 Mar 2024, 11:47 | 11.6 | 11.6 mg/l |
| 7 Feb 2024, 11:34 | 11.2 | 11.2 mg/l |
| 3 Jan 2024, 13:08 | 10.3 | 10.3 mg/l |
| 6 Dec 2023, 11:20 | 11.7 | 11.7 mg/l |
| 8 Nov 2023, 12:23 | 10.6 | 10.6 mg/l |
| 4 Oct 2023, 10:11 | 9.91 | 9.91 mg/l |
Water temperature
code 0076 · °C
9.8 °C
Sampled 12 Mar 2026, 7 months ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Mar 2026, 13:15 | 9.8 | 9.8 °C |
| 4 Feb 2026, 10:26 | 7.2 | 7.2 °C |
| 8 Jan 2026, 12:41 | 6.2 | 6.2 °C |
| 10 Dec 2025, 11:16 | 10.1 | 10.1 °C |
| 24 Nov 2025, 12:52 | 7.6 | 7.6 °C |
| 13 Oct 2025, 12:46 | 12.4 | 12.4 °C |
| 2 Sep 2025, 11:19 | 15 | 15 °C |
| 1 Aug 2025, 16:09 | 18.1 | 18.1 °C |
| 15 Jul 2025, 15:16 | 19 | 19 °C |
| 3 Jun 2025, 13:28 | 14.7 | 14.7 °C |
| 12 May 2025, 14:43 | 16.3 | 16.3 °C |
| 3 Apr 2025, 11:56 | 11.3 | 11.3 °C |
| 3 Mar 2025, 10:50 | 7.1 | 7.1 °C |
| 3 Feb 2025, 11:35 | 6.8 | 6.8 °C |
| 13 Jan 2025, 10:19 | 6.9 | 6.9 °C |
| 6 Dec 2024, 12:03 | 8.6 | 8.6 °C |
| 5 Nov 2024, 11:53 | 11 | 11 °C |
| 11 Oct 2024, 14:23 | 11.2 | 11.2 °C |
| 20 Sep 2024, 13:31 | 16.2 | 16.2 °C |
| 22 Aug 2024, 14:06 | 15.8 | 15.8 °C |
| 4 Jul 2024, 10:32 | 14.9 | 14.9 °C |
| 6 Jun 2024, 10:23 | 13 | 13 °C |
| 5 Mar 2024, 11:47 | 8.7 | 8.7 °C |
| 7 Feb 2024, 11:34 | 9.3 | 9.3 °C |
| 3 Jan 2024, 13:08 | 9 | 9 °C |
| 6 Dec 2023, 11:20 | 7.4 | 7.4 °C |
| 8 Nov 2023, 12:23 | 10.5 | 10.5 °C |
| 4 Oct 2023, 10:11 | 13.7 | 13.7 °C |
pH
code 0061
8.36
Sampled 12 Mar 2026, 7 months ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Mar 2026, 13:15 | 8.36 | 8.36 |
| 4 Feb 2026, 10:26 | 7.91 | 7.91 |
| 8 Jan 2026, 12:41 | 8.2 | 8.2 |
| 10 Dec 2025, 11:16 | 7.76 | 7.76 |
| 24 Nov 2025, 12:52 | 7.77 | 7.77 |
| 13 Oct 2025, 12:46 | 8.05 | 8.05 |
| 2 Sep 2025, 11:19 | 8.03 | 8.03 |
| 1 Aug 2025, 16:09 | 8.15 | 8.15 |
| 15 Jul 2025, 15:16 | 8.36 | 8.36 |
| 3 Jun 2025, 13:28 | 8.15 | 8.15 |
| 12 May 2025, 14:43 | 8.25 | 8.25 |
| 3 Apr 2025, 11:56 | 8.41 | 8.41 |
| 3 Mar 2025, 10:50 | 8.24 | 8.24 |
| 3 Feb 2025, 11:35 | 8.15 | 8.15 |
| 13 Jan 2025, 10:19 | 8.13 | 8.13 |
| 6 Dec 2024, 12:03 | 7.95 | 7.95 |
| 5 Nov 2024, 11:53 | 8.16 | 8.16 |
| 11 Oct 2024, 14:23 | 8.05 | 8.05 |
| 20 Sep 2024, 13:31 | 8.12 | 8.12 |
| 22 Aug 2024, 14:06 | 8.23 | 8.23 |
| 4 Jul 2024, 10:32 | 8.41 | 8.41 |
| 6 Jun 2024, 10:23 | 8.28 | 8.28 |
| 5 Mar 2024, 11:47 | 8.18 | 8.18 |
| 7 Feb 2024, 11:34 | 8.23 | 8.23 |
| 3 Jan 2024, 13:08 | 7.82 | 7.82 |
| 6 Dec 2023, 11:20 | 8.02 | 8.02 |
| 8 Nov 2023, 12:23 | 8.03 | 8.03 |
| 4 Oct 2023, 10:11 | 8.17 | 8.17 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 12 Mar 2026, 7 months ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Mar 2026, 13:15 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Feb 2026, 10:26 | <0.03 | below 0.03 mg/l (not detected above this) |
| 8 Jan 2026, 12:41 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Dec 2025, 11:16 | <0.03 | below 0.03 mg/l (not detected above this) |
| 24 Nov 2025, 12:52 | 0.065 | 0.065 mg/l |
| 13 Oct 2025, 12:46 | 0.033 | 0.033 mg/l |
| 2 Sep 2025, 11:19 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Aug 2025, 16:09 | <0.03 | below 0.03 mg/l (not detected above this) |
| 15 Jul 2025, 15:16 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Jun 2025, 13:28 | <0.03 | below 0.03 mg/l (not detected above this) |
| 12 May 2025, 14:43 | 0.032 | 0.032 mg/l |
| 3 Mar 2025, 10:50 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Feb 2025, 11:35 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 Jan 2025, 10:19 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Nov 2024, 11:53 | <0.03 | below 0.03 mg/l (not detected above this) |
| 11 Oct 2024, 14:23 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 Sep 2024, 13:31 | 0.22 | 0.22 mg/l |
| 22 Aug 2024, 14:06 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Jul 2024, 10:32 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 Jun 2024, 10:23 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Mar 2024, 11:47 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 Feb 2024, 11:34 | 0.036 | 0.036 mg/l |
| 3 Jan 2024, 13:08 | 0.045 | 0.045 mg/l |
| 6 Dec 2023, 11:20 | <0.03 | below 0.03 mg/l (not detected above this) |
| 8 Nov 2023, 12:23 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Oct 2023, 10:11 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
6.69 mg/l
Sampled 12 Mar 2026, 7 months ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Mar 2026, 13:15 | 6.69 | 6.69 mg/l |
| 4 Feb 2026, 10:26 | 3.69 | 3.69 mg/l |
| 8 Jan 2026, 12:41 | 8.25 | 8.25 mg/l |
| 10 Dec 2025, 11:16 | 5.58 | 5.58 mg/l |
| 24 Nov 2025, 12:52 | 9.35 | 9.35 mg/l |
| 13 Oct 2025, 12:46 | 13 | 13 mg/l |
| 2 Sep 2025, 11:19 | 11 | 11 mg/l |
| 1 Aug 2025, 16:09 | 9.98 | 9.98 mg/l |
| 15 Jul 2025, 15:16 | 11 | 11 mg/l |
| 3 Jun 2025, 13:28 | 8.87 | 8.87 mg/l |
| 12 May 2025, 14:43 | 8.08 | 8.08 mg/l |
| 3 Mar 2025, 10:50 | 6.89 | 6.89 mg/l |
| 3 Feb 2025, 11:35 | 6.48 | 6.48 mg/l |
| 13 Jan 2025, 10:19 | 6.99 | 6.99 mg/l |
| 5 Nov 2024, 11:53 | 7.99 | 7.99 mg/l |
| 11 Oct 2024, 14:23 | 5.79 | 5.79 mg/l |
| 20 Sep 2024, 13:31 | 4.28 | 4.28 mg/l |
| 22 Aug 2024, 14:06 | 9.39 | 9.39 mg/l |
| 4 Jul 2024, 10:32 | 7.98 | 7.98 mg/l |
| 6 Jun 2024, 10:23 | 7.47 | 7.47 mg/l |
| 5 Mar 2024, 11:47 | 5.28 | 5.28 mg/l |
| 7 Feb 2024, 11:34 | 6.18 | 6.18 mg/l |
| 3 Jan 2024, 13:08 | 4.18 | 4.18 mg/l |
| 6 Dec 2023, 11:20 | 5.68 | 5.68 mg/l |
| 8 Nov 2023, 12:23 | 5.48 | 5.48 mg/l |
| 4 Oct 2023, 10:11 | 9.89 | 9.89 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.18 mg/l
Sampled 12 Mar 2026, 7 months ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Mar 2026, 13:15 | 0.18 | 0.18 mg/l |
| 4 Feb 2026, 10:26 | 0.25 | 0.25 mg/l |
| 8 Jan 2026, 12:41 | 0.33 | 0.33 mg/l |
| 10 Dec 2025, 11:16 | 0.37 | 0.37 mg/l |
| 24 Nov 2025, 12:52 | 0.42 | 0.42 mg/l |
| 13 Oct 2025, 12:46 | 0.57 | 0.57 mg/l |
| 2 Sep 2025, 11:19 | 0.47 | 0.47 mg/l |
| 1 Aug 2025, 16:09 | 0.56 | 0.56 mg/l |
| 15 Jul 2025, 15:16 | 0.52 | 0.52 mg/l |
| 3 Jun 2025, 13:28 | 0.46 | 0.46 mg/l |
| 12 May 2025, 14:43 | 0.32 | 0.32 mg/l |
| 3 Mar 2025, 10:50 | 0.18 | 0.18 mg/l |
| 3 Feb 2025, 11:35 | 0.2 | 0.2 mg/l |
| 13 Jan 2025, 10:19 | 0.23 | 0.23 mg/l |
| 5 Nov 2024, 11:53 | 0.29 | 0.29 mg/l |
| 11 Oct 2024, 14:23 | 0.33 | 0.33 mg/l |
| 20 Sep 2024, 13:31 | 0.29 | 0.29 mg/l |
| 22 Aug 2024, 14:06 | 0.46 | 0.46 mg/l |
| 4 Jul 2024, 10:32 | 0.33 | 0.33 mg/l |
| 6 Jun 2024, 10:23 | 0.27 | 0.27 mg/l |
| 5 Mar 2024, 11:47 | 0.18 | 0.18 mg/l |
| 3 Jan 2024, 13:08 | 0.27 | 0.27 mg/l |
| 6 Dec 2023, 11:20 | 0.25 | 0.25 mg/l |
| 8 Nov 2023, 12:23 | 0.27 | 0.27 mg/l |
| 4 Oct 2023, 10:11 | 0.49 | 0.49 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
623 µS/cm
Sampled 12 Mar 2026, 7 months ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Mar 2026, 13:15 | 623 | 623 µS/cm |
| 4 Feb 2026, 10:26 | 399 | 399 µS/cm |
| 8 Jan 2026, 12:41 | 697 | 697 µS/cm |
| 10 Dec 2025, 11:16 | 437 | 437 µS/cm |
| 24 Nov 2025, 12:52 | 682 | 682 µS/cm |
| 13 Oct 2025, 12:46 | 744 | 744 µS/cm |
| 2 Sep 2025, 11:19 | 686 | 686 µS/cm |
| 1 Aug 2025, 16:09 | 644 | 644 µS/cm |
| 15 Jul 2025, 15:16 | 705 | 705 µS/cm |
| 3 Jun 2025, 13:28 | 670 | 670 µS/cm |
| 12 May 2025, 14:43 | 664 | 664 µS/cm |
| 3 Apr 2025, 11:56 | 646 | 646 µS/cm |
| 3 Mar 2025, 10:50 | 596 | 596 µS/cm |
| 3 Feb 2025, 11:35 | 616 | 616 µS/cm |
| 13 Jan 2025, 10:19 | 634 | 634 µS/cm |
| 6 Dec 2024, 12:03 | 473 | 473 µS/cm |
| 5 Nov 2024, 11:53 | 660 | 660 µS/cm |
| 11 Oct 2024, 14:23 | 553 | 553 µS/cm |
| 20 Sep 2024, 13:31 | 375 | 375 µS/cm |
| 22 Aug 2024, 14:06 | 692 | 692 µS/cm |
| 4 Jul 2024, 10:32 | 689 | 689 µS/cm |
| 6 Jun 2024, 10:23 | 659 | 659 µS/cm |
| 5 Mar 2024, 11:47 | 570 | 570 µS/cm |
| 7 Feb 2024, 11:34 | 599 | 599 µS/cm |
| 3 Jan 2024, 13:08 | 432 | 432 µS/cm |
| 6 Dec 2023, 11:20 | 519 | 519 µS/cm |
| 8 Nov 2023, 12:23 | 539 | 539 µS/cm |
| 4 Oct 2023, 10:11 | 721 | 721 µS/cm |
Everything measured here
13 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 13 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 28 | Oct 2023 – Mar 2026 | 106.6% 12 Mar 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 28 | Oct 2023 – Mar 2026 | 12.1 mg/l 12 Mar 2026 |
| Temperature of Water 0076 | River water | 28 | Oct 2023 – Mar 2026 | 9.8 °C 12 Mar 2026 |
| pH 0061 | River water | 28 | Oct 2023 – Mar 2026 | 8.36 12 Mar 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 26 | Oct 2023 – Mar 2026 | below 0.03 mg/l 12 Mar 2026 |
| Nitrate as N 0117 | River water | 26 | Oct 2023 – Mar 2026 | 6.69 mg/l 12 Mar 2026 |
| Orthophosphate, reactive as P 0180 | River water | 25 | Oct 2023 – Mar 2026 | 0.18 mg/l 12 Mar 2026 |
| Conductivity at 25 C 0077 | River water | 28 | Oct 2023 – Mar 2026 | 623 µS/cm 12 Mar 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 26 | Oct 2023 – Mar 2026 | 240 mg/l 12 Mar 2026 |
| Ammonia un-ionised as N 0119 | River water | 26 | Oct 2023 – Mar 2026 | below 0.00054 mg/l 12 Mar 2026 |
| BOD : 5 Day ATU 0085 | River water | 25 | Oct 2023 – Mar 2026 | 1.4 mg/l 12 Mar 2026 |
| Nitrite as N 0118 | River water | 26 | Oct 2023 – Mar 2026 | 0.013 mg/l 12 Mar 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 26 | Oct 2023 – Mar 2026 | 6.7 mg/l 12 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.