River Itchen downstream of Eastleigh sewage treatment works
EA name: R ITCHEN D/S EASTLEIGH STW (also listed as “RIVER ITCHEN DOWNSTREAM OF EASTLEIGH SEWAGE TREATMENT WORKS”)
Environment Agency sampling point SO-G0003792 · 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
- 2 Sep 2026, 11:3736 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 18 since 8 Apr 2025 Imported periods: 1 Oct 2023 – 8 Oct 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Monitoring (national agency policy)
- Where
- National Grid 446820, 117830As published, to the nearest 10 m. Open in a map
- River, by its own name
- Itchen
- River, by the map
- River ItchenPlaced on the river its name gives, 2 m from the line.
- Next gauge downstream
- Mansbridge USGS 4.3 km along the river
- Nearest gauge upstream
- Bishopstoke On the River Itchen · 1.9 km along the river
- Why it was sampled
- Monitoring (national agency policy) (18 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
100.4%
Sampled 2 Sep 2026, 36 days ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 2 Sep 2026, 11:37 | 100.4 | 100.4% |
| 4 Aug 2026, 12:45 | 113 | 113% |
| 6 Jul 2026, 13:01 | 118 | 118% |
| 9 Jun 2026, 11:50 | 106.1 | 106.1% |
| 11 May 2026, 12:38 | 106.9 | 106.9% |
| 24 Apr 2026, 13:34 | 116.3 | 116.3% |
| 20 Mar 2026, 17:30 | 105.8 | 105.8% |
| 26 Feb 2026, 08:35 | 94.4 | 94.4% |
| 26 Jan 2026, 12:49 | 97.3 | 97.3% |
| 10 Dec 2025, 15:56 | 96.8 | 96.8% |
| 19 Nov 2025, 15:11 | 97.7 | 97.7% |
| 13 Oct 2025, 11:40 | 103.5 | 103.5% |
| 8 Sep 2025, 12:02 | 106.3 | 106.3% |
| 14 Aug 2025, 14:07 | 115.3 | 115.3% |
| 18 Jul 2025, 15:51 | 118.4 | 118.4% |
| 2 Jun 2025, 11:06 | 106.2 | 106.2% |
| 2 May 2025, 16:14 | 114.7 | 114.7% |
| 8 Apr 2025, 10:42 | 103.2 | 103.2% |
Dissolved oxygen
as O2 · code 9924 · mg/l
10 mg/l
Sampled 2 Sep 2026, 36 days ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 2 Sep 2026, 11:37 | 10 | 10 mg/l |
| 4 Aug 2026, 12:45 | 10.5 | 10.5 mg/l |
| 6 Jul 2026, 13:01 | 10.9 | 10.9 mg/l |
| 9 Jun 2026, 11:50 | 10.9 | 10.9 mg/l |
| 11 May 2026, 12:38 | 11.6 | 11.6 mg/l |
| 24 Apr 2026, 13:34 | 12 | 12 mg/l |
| 20 Mar 2026, 17:30 | 11.5 | 11.5 mg/l |
| 26 Feb 2026, 08:35 | 10.5 | 10.5 mg/l |
| 26 Jan 2026, 12:49 | 11.3 | 11.3 mg/l |
| 10 Dec 2025, 15:56 | 10.7 | 10.7 mg/l |
| 19 Nov 2025, 15:11 | 11.7 | 11.7 mg/l |
| 13 Oct 2025, 11:40 | 11 | 11 mg/l |
| 8 Sep 2025, 12:02 | 10.5 | 10.5 mg/l |
| 14 Aug 2025, 14:07 | 10.8 | 10.8 mg/l |
| 18 Jul 2025, 15:51 | 10.8 | 10.8 mg/l |
| 2 Jun 2025, 11:06 | 10.7 | 10.7 mg/l |
| 2 May 2025, 16:14 | 11 | 11 mg/l |
| 8 Apr 2025, 10:42 | 11.5 | 11.5 mg/l |
Water temperature
code 0076 · °C
15.4 °C
Sampled 2 Sep 2026, 36 days ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 2 Sep 2026, 11:37 | 15.4 | 15.4 °C |
| 4 Aug 2026, 12:45 | 19 | 19 °C |
| 6 Jul 2026, 13:01 | 19.3 | 19.3 °C |
| 9 Jun 2026, 11:50 | 14 | 14 °C |
| 11 May 2026, 12:38 | 11.7 | 11.7 °C |
| 24 Apr 2026, 13:34 | 13.8 | 13.8 °C |
| 20 Mar 2026, 17:30 | 11.4 | 11.4 °C |
| 26 Feb 2026, 08:35 | 10.7 | 10.7 °C |
| 26 Jan 2026, 12:49 | 8.7 | 8.7 °C |
| 10 Dec 2025, 15:56 | 10.9 | 10.9 °C |
| 19 Nov 2025, 15:11 | 7.5 | 7.5 °C |
| 13 Oct 2025, 11:40 | 12.4 | 12.4 °C |
| 8 Sep 2025, 12:02 | 15.9 | 15.9 °C |
| 14 Aug 2025, 14:07 | 18.6 | 18.6 °C |
| 18 Jul 2025, 15:51 | 19.9 | 19.9 °C |
| 2 Jun 2025, 11:06 | 15 | 15 °C |
| 2 May 2025, 16:14 | 17.1 | 17.1 °C |
| 8 Apr 2025, 10:42 | 10.6 | 10.6 °C |
pH
code 0061
8.27
Sampled 2 Sep 2026, 36 days ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 2 Sep 2026, 11:37 | 8.27 | 8.27 |
| 4 Aug 2026, 12:45 | 8.26 | 8.26 |
| 6 Jul 2026, 13:01 | 8.24 | 8.24 |
| 9 Jun 2026, 11:50 | 8.16 | 8.16 |
| 11 May 2026, 12:38 | 8.31 | 8.31 |
| 24 Apr 2026, 13:34 | 8.2 | 8.2 |
| 20 Mar 2026, 17:30 | 8.1 | 8.1 |
| 26 Feb 2026, 08:35 | 7.94 | 7.94 |
| 26 Jan 2026, 12:49 | 8.14 | 8.14 |
| 10 Dec 2025, 15:56 | 8.06 | 8.06 |
| 19 Nov 2025, 15:11 | 8.16 | 8.16 |
| 13 Oct 2025, 11:40 | 8.13 | 8.13 |
| 8 Sep 2025, 12:02 | 8.24 | 8.24 |
| 14 Aug 2025, 14:07 | 8.17 | 8.17 |
| 18 Jul 2025, 15:51 | 8.22 | 8.22 |
| 2 Jun 2025, 11:06 | 8.34 | 8.34 |
| 2 May 2025, 16:14 | 8.2 | 8.2 |
| 8 Apr 2025, 10:42 | 8.11 | 8.11 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 2 Sep 2026, 36 days ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 2 Sep 2026, 11:37 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Aug 2026, 12:45 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 Jul 2026, 13:01 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Jun 2026, 11:50 | <0.03 | below 0.03 mg/l (not detected above this) |
| 11 May 2026, 12:38 | <0.03 | below 0.03 mg/l (not detected above this) |
| 24 Apr 2026, 13:34 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 Mar 2026, 17:30 | <0.03 | below 0.03 mg/l (not detected above this) |
| 26 Feb 2026, 08:35 | <0.03 | below 0.03 mg/l (not detected above this) |
| 26 Jan 2026, 12:49 | 0.14 | 0.14 mg/l |
| 10 Dec 2025, 15:56 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 Nov 2025, 15:11 | 0.26 | 0.26 mg/l |
| 13 Oct 2025, 11:40 | <0.03 | below 0.03 mg/l (not detected above this) |
| 8 Sep 2025, 12:02 | 0.11 | 0.11 mg/l |
| 14 Aug 2025, 14:07 | <0.03 | below 0.03 mg/l (not detected above this) |
| 18 Jul 2025, 15:51 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Jun 2025, 11:06 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 May 2025, 16:14 | <0.03 | below 0.03 mg/l (not detected above this) |
| 8 Apr 2025, 10:42 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
7.79 mg/l
Sampled 2 Sep 2026, 36 days ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 2 Sep 2026, 11:37 | 7.79 | 7.79 mg/l |
| 4 Aug 2026, 12:45 | 9.18 | 9.18 mg/l |
| 6 Jul 2026, 13:01 | 9.58 | 9.58 mg/l |
| 9 Jun 2026, 11:50 | 8.78 | 8.78 mg/l |
| 11 May 2026, 12:38 | 8.88 | 8.88 mg/l |
| 24 Apr 2026, 13:34 | 8.99 | 8.99 mg/l |
| 20 Mar 2026, 17:30 | 8.99 | 8.99 mg/l |
| 26 Feb 2026, 08:35 | 8.48 | 8.48 mg/l |
| 26 Jan 2026, 12:49 | 7.99 | 7.99 mg/l |
| 10 Dec 2025, 15:56 | 8.39 | 8.39 mg/l |
| 19 Nov 2025, 15:11 | 8.88 | 8.88 mg/l |
| 13 Oct 2025, 11:40 | 9.69 | 9.69 mg/l |
| 8 Sep 2025, 12:02 | 9.27 | 9.27 mg/l |
| 14 Aug 2025, 14:07 | 9.18 | 9.18 mg/l |
| 18 Jul 2025, 15:51 | 9.28 | 9.28 mg/l |
| 2 Jun 2025, 11:06 | 9.98 | 9.98 mg/l |
| 2 May 2025, 16:14 | 9.58 | 9.58 mg/l |
| 8 Apr 2025, 10:42 | 8.89 | 8.89 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.035 mg/l
Sampled 2 Sep 2026, 36 days ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 2 Sep 2026, 11:37 | 0.035 | 0.035 mg/l |
| 4 Aug 2026, 12:45 | 0.048 | 0.048 mg/l |
| 6 Jul 2026, 13:01 | 0.066 | 0.066 mg/l |
| 9 Jun 2026, 11:50 | 0.065 | 0.065 mg/l |
| 11 May 2026, 12:38 | 0.06 | 0.06 mg/l |
| 24 Apr 2026, 13:34 | 0.04 | 0.04 mg/l |
| 20 Mar 2026, 17:30 | 0.04 | 0.04 mg/l |
| 26 Feb 2026, 08:35 | 0.058 | 0.058 mg/l |
| 26 Jan 2026, 12:49 | 0.074 | 0.074 mg/l |
| 10 Dec 2025, 15:56 | 0.096 | 0.096 mg/l |
| 19 Nov 2025, 15:11 | 0.059 | 0.059 mg/l |
| 13 Oct 2025, 11:40 | 0.048 | 0.048 mg/l |
| 8 Sep 2025, 12:02 | 0.054 | 0.054 mg/l |
| 14 Aug 2025, 14:07 | 0.045 | 0.045 mg/l |
| 18 Jul 2025, 15:51 | 0.05 | 0.05 mg/l |
| 2 Jun 2025, 11:06 | 0.046 | 0.046 mg/l |
| 2 May 2025, 16:14 | 0.05 | 0.05 mg/l |
| 8 Apr 2025, 10:42 | 0.04 | 0.04 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
609 µS/cm
Sampled 2 Sep 2026, 36 days ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 2 Sep 2026, 11:37 | 609 | 609 µS/cm |
| 4 Aug 2026, 12:45 | 619 | 619 µS/cm |
| 6 Jul 2026, 13:01 | 628 | 628 µS/cm |
| 9 Jun 2026, 11:50 | 606 | 606 µS/cm |
| 11 May 2026, 12:38 | 619 | 619 µS/cm |
| 24 Apr 2026, 13:34 | 613 | 613 µS/cm |
| 20 Mar 2026, 17:30 | 624 | 624 µS/cm |
| 26 Feb 2026, 08:35 | 627 | 627 µS/cm |
| 26 Jan 2026, 12:49 | 614 | 614 µS/cm |
| 10 Dec 2025, 15:56 | 609 | 609 µS/cm |
| 19 Nov 2025, 15:11 | 621 | 621 µS/cm |
| 13 Oct 2025, 11:40 | 638 | 638 µS/cm |
| 8 Sep 2025, 12:02 | 622 | 622 µS/cm |
| 14 Aug 2025, 14:07 | 610 | 610 µS/cm |
| 18 Jul 2025, 15:51 | 608 | 608 µS/cm |
| 2 Jun 2025, 11:06 | 624 | 624 µS/cm |
| 2 May 2025, 16:14 | 616 | 616 µS/cm |
| 8 Apr 2025, 10:42 | 627 | 627 µS/cm |
Everything measured here
12 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 12 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 18 | Apr 2025 – Sep 2026 | 100.4% 2 Sep 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 18 | Apr 2025 – Sep 2026 | 10 mg/l 2 Sep 2026 |
| Temperature of Water 0076 | River water | 18 | Apr 2025 – Sep 2026 | 15.4 °C 2 Sep 2026 |
| pH 0061 | River water | 18 | Apr 2025 – Sep 2026 | 8.27 2 Sep 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 18 | Apr 2025 – Sep 2026 | below 0.03 mg/l 2 Sep 2026 |
| Nitrate as N 0117 | River water | 18 | Apr 2025 – Sep 2026 | 7.79 mg/l 2 Sep 2026 |
| Orthophosphate, reactive as P 0180 | River water | 18 | Apr 2025 – Sep 2026 | 0.035 mg/l 2 Sep 2026 |
| Conductivity at 25 C 0077 | River water | 18 | Apr 2025 – Sep 2026 | 609 µS/cm 2 Sep 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 18 | Apr 2025 – Sep 2026 | 250 mg/l 2 Sep 2026 |
| Ammonia un-ionised as N 0119 | River water | 18 | Apr 2025 – Sep 2026 | below 0.00081 mg/l 2 Sep 2026 |
| Nitrite as N 0118 | River water | 18 | Apr 2025 – Sep 2026 | 0.011 mg/l 2 Sep 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 18 | Apr 2025 – Sep 2026 | 7.8 mg/l 2 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.