Orcheston Down
EA name: SSN0062 ORCHESTON DOWN
Environment Agency sampling point SW-SSN0062 · 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
- 27 Aug 2026, 08:4035 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 20 since 8 Jan 2025 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 404781, 145977As published, to the nearest 1 m. Open in a map
- River, by its own name
- Its name does not give one
- River, by the map
- Not placedNo mapped watercourse within 500 m. The river map cannot say which watercourse this is.
- Next gauge downstream
- Not known
- Why it was sampled
- Monitoring (national agency policy) (20 samples)
16 visits found no water to sample (recorded as “No flow”).
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
98.8%
Sampled 13 Feb 2026, 8 months ago · 3 results banked
Every result (3)
| Sampled | Result as published | Reads as |
|---|---|---|
| 13 Feb 2026, 11:59 | 98.8 | 98.8% |
| 19 Mar 2025, 13:09 | 160.8 | 160.8% |
| 3 Feb 2025, 12:15 | 92.9 | 92.9% |
Dissolved oxygen
as O2 · code 9924 · mg/l
11.3 mg/l
Sampled 13 Feb 2026, 8 months ago · 3 results banked
Every result (3)
| Sampled | Result as published | Reads as |
|---|---|---|
| 13 Feb 2026, 11:59 | 11.3 | 11.3 mg/l |
| 19 Mar 2025, 13:09 | 17.1 | 17.1 mg/l |
| 3 Feb 2025, 12:15 | 10.7 | 10.7 mg/l |
Water temperature
code 0076 · °C
9.3 °C
Sampled 13 Feb 2026, 8 months ago · 3 results banked
Every result (3)
| Sampled | Result as published | Reads as |
|---|---|---|
| 13 Feb 2026, 11:59 | 9.3 | 9.3 °C |
| 19 Mar 2025, 13:09 | 12.5 | 12.5 °C |
| 3 Feb 2025, 12:15 | 8.9 | 8.9 °C |
pH
code 0061
7.59
Sampled 13 Feb 2026, 8 months ago · 3 results banked
Every result (3)
| Sampled | Result as published | Reads as |
|---|---|---|
| 13 Feb 2026, 11:59 | 7.59 | 7.59 |
| 19 Mar 2025, 13:09 | 8.55 | 8.55 |
| 3 Feb 2025, 12:15 | 7.77 | 7.77 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 13 Feb 2026, 8 months ago · 3 results banked
Every result (3)
| Sampled | Result as published | Reads as |
|---|---|---|
| 13 Feb 2026, 11:59 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 Mar 2025, 13:09 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Feb 2025, 12:15 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
5.4 mg/l
Sampled 13 Feb 2026, 8 months ago · 3 results banked
Every result (3)
| Sampled | Result as published | Reads as |
|---|---|---|
| 13 Feb 2026, 11:59 | 5.4 | 5.4 mg/l |
| 19 Mar 2025, 13:09 | 4.19 | 4.19 mg/l |
| 3 Feb 2025, 12:15 | 5.59 | 5.59 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.2 mg/l
Sampled 13 Feb 2026, 8 months ago · 3 results banked
Every result (3)
| Sampled | Result as published | Reads as |
|---|---|---|
| 13 Feb 2026, 11:59 | 0.2 | 0.2 mg/l |
| 19 Mar 2025, 13:09 | 0.099 | 0.099 mg/l |
| 3 Feb 2025, 12:15 | 0.18 | 0.18 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
582 µS/cm
Sampled 13 Feb 2026, 8 months ago · 3 results banked
Every result (3)
| Sampled | Result as published | Reads as |
|---|---|---|
| 13 Feb 2026, 11:59 | 582 | 582 µS/cm |
| 19 Mar 2025, 13:09 | 555 | 555 µS/cm |
| 3 Feb 2025, 12:15 | 606 | 606 µS/cm |
Everything measured here
23 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 23 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 3 | Feb 2025 – Feb 2026 | 98.8% 13 Feb 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 3 | Feb 2025 – Feb 2026 | 11.3 mg/l 13 Feb 2026 |
| Temperature of Water 0076 | River water | 3 | Feb 2025 – Feb 2026 | 9.3 °C 13 Feb 2026 |
| pH 0061 | River water | 3 | Feb 2025 – Feb 2026 | 7.59 13 Feb 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 3 | Feb 2025 – Feb 2026 | below 0.03 mg/l 13 Feb 2026 |
| Nitrate as N 0117 | River water | 3 | Feb 2025 – Feb 2026 | 5.4 mg/l 13 Feb 2026 |
| Orthophosphate, reactive as P 0180 | River water | 3 | Feb 2025 – Feb 2026 | 0.2 mg/l 13 Feb 2026 |
| Conductivity at 25 C 0077 | River water | 3 | Feb 2025 – Feb 2026 | 582 µS/cm 13 Feb 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 3 | Feb 2025 – Feb 2026 | 240 mg/l 13 Feb 2026 |
| Aminomethylphosphonic acid 7125 | River water | 1 | Feb 2026 – Feb 2026 | below 0.1 µg/l 13 Feb 2026 |
| Ammonia un-ionised as N 0119 | River water | 3 | Feb 2025 – Feb 2026 | below 0.0002 mg/l 13 Feb 2026 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 3 | Feb 2025 – Feb 2026 | 2.1 mg/l 13 Feb 2026 |
| Chloride 0172 | River water | 3 | Feb 2025 – Feb 2026 | 18 mg/l 13 Feb 2026 |
| eDNA Report 3047 | River water | 1 | Feb 2025 – Feb 2025 | 1 text result 6 Feb 2025 |
| Flow Type 2896 | River water | 14 | Jan 2025 – Aug 2026 | Dry 27 Aug 2026 |
| Glyphosate 3007 | River water | 1 | Feb 2026 – Feb 2026 | below 0.1 µg/l 13 Feb 2026 |
| Nitrite as N 0118 | River water | 3 | Feb 2025 – Feb 2026 | below 0.004 mg/l 13 Feb 2026 |
| Nitrogen, Total as N 9686 | River water | 3 | Feb 2025 – Feb 2026 | 5.6 mg/l 13 Feb 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 3 | Feb 2025 – Feb 2026 | 5.4 mg/l 13 Feb 2026 |
| No flow /No sample 7668 | River water | 16 | Jan 2025 – Aug 2026 | No flow/discharge at sampling point 27 Aug 2026 |
| Phosphorus, Total as P 0348 | River water | 3 | Feb 2025 – Feb 2026 | 0.19 mg/l 13 Feb 2026 |
| Silica, reactive as SiO2 0182 | River water | 3 | Feb 2025 – Feb 2026 | 11 mg/l 13 Feb 2026 |
| Solids, Suspended at 105 C 0135 | River water | 3 | Feb 2025 – Feb 2026 | 3.2 mg/l 13 Feb 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.