River Tone at Greenham
EA name: RIVER TONE AT GREENHAM (also listed as “GREENHAM”)
Environment Agency sampling point SW-E1002900 · 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 Sep 2026, 08:0213 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 22 since 2 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) · results completed 23 Sep 2026
- Where
- National Grid 307829, 120222As published, to the nearest 1 m. Open in a map
- River, by its own name
- Tone
- River, by the map
- River TonePlaced on the river its name gives, 2 m from the line.
- Next gauge downstream
- Greenham On the River Tone · 0.1 km along the river
- Why it was sampled
- Monitoring (national agency policy) (22 samples)
Results here were completed a median of 7 days after the sample was taken (3 to 48 days, 13 samples).
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
94.2%
Sampled 18 Sep 2026, 13 days ago · 22 results banked
Every result (22)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 Sep 2026, 08:02 | 94.2 | 94.2% |
| 26 Aug 2026, 09:14 | 94.7 | 94.7% |
| 14 Jul 2026, 08:21 | 91 | 91% |
| 10 Jun 2026, 09:27 | 102.8 | 102.8% |
| 21 May 2026, 10:44 | 98.9 | 98.9% |
| 29 Apr 2026, 09:14 | 101.8 | 101.8% |
| 2 Mar 2026, 11:13 | 103.5 | 103.5% |
| 3 Feb 2026, 13:49 | 101 | 101% |
| 6 Jan 2026, 15:24 | 99.6 | 99.6% |
| 3 Dec 2025, 08:17 | 102.6 | 102.6% |
| 13 Nov 2025, 12:01 | 99 | 99% |
| 2 Oct 2025, 11:57 | 96.2 | 96.2% |
| 15 Sep 2025, 09:59 | 97 | 97% |
| 5 Aug 2025, 11:33 | 96.5 | 96.5% |
| 9 Apr 2025, 12:19 | 108.3 | 108.3% |
| 6 Mar 2024, 09:47 | 101 | 101% |
| 1 Feb 2024, 09:30 | 99.7 | 99.7% |
| 3 Jan 2024, 08:56 | 98.8 | 98.8% |
| 5 Dec 2023, 08:33 | 99.5 | 99.5% |
| 17 Nov 2023, 09:13 | 101 | 101% |
| 1 Nov 2023, 11:18 | 99.7 | 99.7% |
| 2 Oct 2023, 10:16 | 97 | 97% |
Dissolved oxygen
as O2 · code 9924 · mg/l
9.92 mg/l
Sampled 18 Sep 2026, 13 days ago · 22 results banked
Every result (22)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 Sep 2026, 08:02 | 9.92 | 9.92 mg/l |
| 26 Aug 2026, 09:14 | 9.42 | 9.42 mg/l |
| 14 Jul 2026, 08:21 | 8.61 | 8.61 mg/l |
| 10 Jun 2026, 09:27 | 11.1 | 11.1 mg/l |
| 21 May 2026, 10:44 | 10.4 | 10.4 mg/l |
| 29 Apr 2026, 09:14 | 11.7 | 11.7 mg/l |
| 2 Mar 2026, 11:13 | 11.7 | 11.7 mg/l |
| 3 Feb 2026, 13:49 | 12 | 12 mg/l |
| 6 Jan 2026, 15:24 | 13.2 | 13.2 mg/l |
| 3 Dec 2025, 08:17 | 12.5 | 12.5 mg/l |
| 13 Nov 2025, 12:01 | 10.7 | 10.7 mg/l |
| 2 Oct 2025, 11:57 | 10.5 | 10.5 mg/l |
| 15 Sep 2025, 09:59 | 10.2 | 10.2 mg/l |
| 5 Aug 2025, 11:33 | 9.73 | 9.73 mg/l |
| 9 Apr 2025, 12:19 | 12.5 | 12.5 mg/l |
| 6 Mar 2024, 09:47 | 12.6 | 12.6 mg/l |
| 1 Feb 2024, 09:30 | 12.1 | 12.1 mg/l |
| 3 Jan 2024, 08:56 | 11.4 | 11.4 mg/l |
| 5 Dec 2023, 08:33 | 11.9 | 11.9 mg/l |
| 17 Nov 2023, 09:13 | 11.7 | 11.7 mg/l |
| 1 Nov 2023, 11:18 | 10.8 | 10.8 mg/l |
| 2 Oct 2023, 10:16 | 9.82 | 9.82 mg/l |
Water temperature
code 0076 · °C
12.9 °C
Sampled 18 Sep 2026, 13 days ago · 22 results banked
Every result (22)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 Sep 2026, 08:02 | 12.9 | 12.9 °C |
| 26 Aug 2026, 09:14 | 15.5 | 15.5 °C |
| 14 Jul 2026, 08:21 | 17.9 | 17.9 °C |
| 10 Jun 2026, 09:27 | 11.7 | 11.7 °C |
| 21 May 2026, 10:44 | 12.8 | 12.8 °C |
| 29 Apr 2026, 09:14 | 9.2 | 9.2 °C |
| 2 Mar 2026, 11:13 | 9.7 | 9.7 °C |
| 3 Feb 2026, 13:49 | 7.8 | 7.8 °C |
| 6 Jan 2026, 15:24 | 3.5 | 3.5 °C |
| 3 Dec 2025, 08:17 | 6.7 | 6.7 °C |
| 13 Nov 2025, 12:01 | 11.7 | 11.7 °C |
| 2 Oct 2025, 11:57 | 11.4 | 11.4 °C |
| 15 Sep 2025, 09:59 | 13.2 | 13.2 °C |
| 5 Aug 2025, 11:33 | 14.9 | 14.9 °C |
| 9 Apr 2025, 12:19 | 8.9 | 8.9 °C |
| 6 Mar 2024, 09:47 | 6 | 6 °C |
| 1 Feb 2024, 09:30 | 7.1 | 7.1 °C |
| 3 Jan 2024, 08:56 | 9 | 9 °C |
| 5 Dec 2023, 08:33 | 7.5 | 7.5 °C |
| 17 Nov 2023, 09:13 | 8.8 | 8.8 °C |
| 1 Nov 2023, 11:18 | 11.6 | 11.6 °C |
| 2 Oct 2023, 10:16 | 14.7 | 14.7 °C |
pH
code 0061
7.88
Sampled 18 Sep 2026, 13 days ago · 22 results banked
Every result (22)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 Sep 2026, 08:02 | 7.88 | 7.88 |
| 26 Aug 2026, 09:14 | 7.86 | 7.86 |
| 14 Jul 2026, 08:21 | 7.75 | 7.75 |
| 10 Jun 2026, 09:27 | 8.09 | 8.09 |
| 21 May 2026, 10:44 | 8 | 8 |
| 29 Apr 2026, 09:14 | 8.14 | 8.14 |
| 2 Mar 2026, 11:13 | 7.9 | 7.9 |
| 3 Feb 2026, 13:49 | 7.8 | 7.8 |
| 6 Jan 2026, 15:24 | 8.12 | 8.12 |
| 3 Dec 2025, 08:17 | 7.8 | 7.8 |
| 13 Nov 2025, 12:01 | 7.66 | 7.66 |
| 2 Oct 2025, 11:57 | 8 | 8 |
| 15 Sep 2025, 09:59 | 7.84 | 7.84 |
| 5 Aug 2025, 11:33 | 7.97 | 7.97 |
| 9 Apr 2025, 12:19 | 8.31 | 8.31 |
| 6 Mar 2024, 09:47 | 7.63 | 7.63 |
| 1 Feb 2024, 09:30 | 7.98 | 7.98 |
| 3 Jan 2024, 08:56 | 7.67 | 7.67 |
| 5 Dec 2023, 08:33 | 7.79 | 7.79 |
| 17 Nov 2023, 09:13 | 8.19 | 8.19 |
| 1 Nov 2023, 11:18 | 7.94 | 7.94 |
| 2 Oct 2023, 10:16 | 7.89 | 7.89 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 18 Sep 2026, 13 days ago · 22 results banked
Every result (22)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 Sep 2026, 08:02 | <0.03 | below 0.03 mg/l (not detected above this) |
| 26 Aug 2026, 09:14 | <0.03 | below 0.03 mg/l (not detected above this) |
| 14 Jul 2026, 08:21 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Jun 2026, 09:27 | <0.03 | below 0.03 mg/l (not detected above this) |
| 21 May 2026, 10:44 | 0.036 | 0.036 mg/l |
| 29 Apr 2026, 09:14 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Mar 2026, 11:13 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Feb 2026, 13:49 | 0.032 | 0.032 mg/l |
| 6 Jan 2026, 15:24 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Dec 2025, 08:17 | 0.076 | 0.076 mg/l |
| 13 Nov 2025, 12:01 | 0.3 | 0.3 mg/l |
| 2 Oct 2025, 11:57 | 0.28 | 0.28 mg/l |
| 15 Sep 2025, 09:59 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Aug 2025, 11:33 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Apr 2025, 12:19 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 Mar 2024, 09:47 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Feb 2024, 09:30 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Jan 2024, 08:56 | 0.21 | 0.21 mg/l |
| 5 Dec 2023, 08:33 | 0.049 | 0.049 mg/l |
| 17 Nov 2023, 09:13 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Nov 2023, 11:18 | 0.065 | 0.065 mg/l |
| 2 Oct 2023, 10:16 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
1.3 mg/l
Sampled 18 Sep 2026, 13 days ago · 22 results banked
Every result (22)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 Sep 2026, 08:02 | 1.3 | 1.3 mg/l |
| 26 Aug 2026, 09:14 | 1.4 | 1.4 mg/l |
| 14 Jul 2026, 08:21 | 1.6 | 1.6 mg/l |
| 10 Jun 2026, 09:27 | 1.79 | 1.79 mg/l |
| 21 May 2026, 10:44 | 1.69 | 1.69 mg/l |
| 29 Apr 2026, 09:14 | 1.99 | 1.99 mg/l |
| 2 Mar 2026, 11:13 | 2.3 | 2.3 mg/l |
| 3 Feb 2026, 13:49 | 2.6 | 2.6 mg/l |
| 6 Jan 2026, 15:24 | 3 | 3 mg/l |
| 3 Dec 2025, 08:17 | 3.3 | 3.3 mg/l |
| 13 Nov 2025, 12:01 | 2.89 | 2.89 mg/l |
| 2 Oct 2025, 11:57 | 1.6 | 1.6 mg/l |
| 15 Sep 2025, 09:59 | 1.6 | 1.6 mg/l |
| 5 Aug 2025, 11:33 | 1.4 | 1.4 mg/l |
| 9 Apr 2025, 12:19 | 2.29 | 2.29 mg/l |
| 6 Mar 2024, 09:47 | 2.2 | 2.2 mg/l |
| 1 Feb 2024, 09:30 | 2.3 | 2.3 mg/l |
| 3 Jan 2024, 08:56 | 2 | 2 mg/l |
| 5 Dec 2023, 08:33 | 2.4 | 2.4 mg/l |
| 17 Nov 2023, 09:13 | 2 | 2 mg/l |
| 1 Nov 2023, 11:18 | 2 | 2 mg/l |
| 2 Oct 2023, 10:16 | 2.09 | 2.09 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.047 mg/l
Sampled 18 Sep 2026, 13 days ago · 22 results banked
Every result (22)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 Sep 2026, 08:02 | 0.047 | 0.047 mg/l |
| 26 Aug 2026, 09:14 | 0.044 | 0.044 mg/l |
| 14 Jul 2026, 08:21 | 0.063 | 0.063 mg/l |
| 10 Jun 2026, 09:27 | 0.05 | 0.05 mg/l |
| 21 May 2026, 10:44 | 0.046 | 0.046 mg/l |
| 29 Apr 2026, 09:14 | 0.025 | 0.025 mg/l |
| 2 Mar 2026, 11:13 | 0.015 | 0.015 mg/l |
| 3 Feb 2026, 13:49 | 0.034 | 0.034 mg/l |
| 6 Jan 2026, 15:24 | 0.036 | 0.036 mg/l |
| 3 Dec 2025, 08:17 | 0.055 | 0.055 mg/l |
| 13 Nov 2025, 12:01 | 0.08 | 0.08 mg/l |
| 2 Oct 2025, 11:57 | 0.057 | 0.057 mg/l |
| 15 Sep 2025, 09:59 | <0.01 | below 0.01 mg/l (not detected above this) |
| 5 Aug 2025, 11:33 | <0.01 | below 0.01 mg/l (not detected above this) |
| 9 Apr 2025, 12:19 | <0.01 | below 0.01 mg/l (not detected above this) |
| 6 Mar 2024, 09:47 | 0.011 | 0.011 mg/l |
| 1 Feb 2024, 09:30 | 0.022 | 0.022 mg/l |
| 3 Jan 2024, 08:56 | 0.063 | 0.063 mg/l |
| 5 Dec 2023, 08:33 | 0.038 | 0.038 mg/l |
| 17 Nov 2023, 09:13 | 0.016 | 0.016 mg/l |
| 1 Nov 2023, 11:18 | 0.063 | 0.063 mg/l |
| 2 Oct 2023, 10:16 | 0.029 | 0.029 mg/l |
Turbidity
code 6396 · NTU
3.1 NTU
Sampled 2 Mar 2026, 7 months ago · 16 results banked
Every result (16)
| Sampled | Result as published | Reads as |
|---|---|---|
| 2 Mar 2026, 11:13 | 3.1 | 3.1 NTU |
| 3 Feb 2026, 13:49 | 5 | 5 NTU |
| 6 Jan 2026, 15:24 | 1.4 | 1.4 NTU |
| 3 Dec 2025, 08:17 | 6.6 | 6.6 NTU |
| 13 Nov 2025, 12:01 | 9.6 | 9.6 NTU |
| 2 Oct 2025, 11:57 | 2.7 | 2.7 NTU |
| 15 Sep 2025, 09:59 | 16 | 16 NTU |
| 5 Aug 2025, 11:33 | 6 | 6 NTU |
| 9 Apr 2025, 12:19 | <1 | below 1 NTU (not detected above this) |
| 6 Mar 2024, 09:47 | 1.8 | 1.8 NTU |
| 1 Feb 2024, 09:30 | 3.2 | 3.2 NTU |
| 3 Jan 2024, 08:56 | 23 | 23 NTU |
| 5 Dec 2023, 08:33 | 8.1 | 8.1 NTU |
| 17 Nov 2023, 09:13 | 6.7 | 6.7 NTU |
| 1 Nov 2023, 11:18 | 7.7 | 7.7 NTU |
| 2 Oct 2023, 10:16 | 2.5 | 2.5 NTU |
Conductivity
at 25 °C · code 0077 · µS/cm
224 µS/cm
Sampled 18 Sep 2026, 13 days ago · 22 results banked
Every result (22)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 Sep 2026, 08:02 | 224 | 224 µS/cm |
| 26 Aug 2026, 09:14 | 221 | 221 µS/cm |
| 14 Jul 2026, 08:21 | 237 | 237 µS/cm |
| 10 Jun 2026, 09:27 | 249 | 249 µS/cm |
| 21 May 2026, 10:44 | 239 | 239 µS/cm |
| 29 Apr 2026, 09:14 | 252 | 252 µS/cm |
| 2 Mar 2026, 11:13 | 178 | 178 µS/cm |
| 3 Feb 2026, 13:49 | 184 | 184 µS/cm |
| 6 Jan 2026, 15:24 | 257 | 257 µS/cm |
| 3 Dec 2025, 08:17 | 205 | 205 µS/cm |
| 13 Nov 2025, 12:01 | 212 | 212 µS/cm |
| 2 Oct 2025, 11:57 | 244 | 244 µS/cm |
| 15 Sep 2025, 09:59 | 224 | 224 µS/cm |
| 5 Aug 2025, 11:33 | 227 | 227 µS/cm |
| 9 Apr 2025, 12:19 | 262 | 262 µS/cm |
| 6 Mar 2024, 09:47 | 185 | 185 µS/cm |
| 1 Feb 2024, 09:30 | 203 | 203 µS/cm |
| 3 Jan 2024, 08:56 | 165 | 165 µS/cm |
| 5 Dec 2023, 08:33 | 216 | 216 µS/cm |
| 17 Nov 2023, 09:13 | 188 | 188 µS/cm |
| 1 Nov 2023, 11:18 | 226 | 226 µS/cm |
| 2 Oct 2023, 10:16 | 231 | 231 µS/cm |
Everything measured here
15 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 15 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 22 | Oct 2023 – Sep 2026 | 94.2% 18 Sep 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 22 | Oct 2023 – Sep 2026 | 9.92 mg/l 18 Sep 2026 |
| Temperature of Water 0076 | River water | 22 | Oct 2023 – Sep 2026 | 12.9 °C 18 Sep 2026 |
| pH 0061 | River water | 22 | Oct 2023 – Sep 2026 | 7.88 18 Sep 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 22 | Oct 2023 – Sep 2026 | below 0.03 mg/l 18 Sep 2026 |
| Nitrate as N 0117 | River water | 22 | Oct 2023 – Sep 2026 | 1.3 mg/l 18 Sep 2026 |
| Orthophosphate, reactive as P 0180 | River water | 22 | Oct 2023 – Sep 2026 | 0.047 mg/l 18 Sep 2026 |
| Turbidity 6396 | River water | 16 | Oct 2023 – Mar 2026 | 3.1 NTU 2 Mar 2026 |
| Conductivity at 25 C 0077 | River water | 22 | Oct 2023 – Sep 2026 | 224 µS/cm 18 Sep 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 22 | Oct 2023 – Sep 2026 | 78 mg/l 18 Sep 2026 |
| Ammonia un-ionised as N 0119 | River water | 22 | Oct 2023 – Sep 2026 | below 0.00052 mg/l 18 Sep 2026 |
| Chlorophyll : Acetone Extract 7887 | River water | 14 | Oct 2023 – Mar 2026 | 3.7 µg/l 2 Mar 2026 |
| Nitrite as N 0118 | River water | 22 | Oct 2023 – Sep 2026 | below 0.004 mg/l 18 Sep 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 22 | Oct 2023 – Sep 2026 | 1.3 mg/l 18 Sep 2026 |
| Solids, Suspended at 105 C 0135 | River water | 16 | Oct 2023 – Mar 2026 | 7.4 mg/l 2 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.