Downstream Holmsley A35, Avon Water
EA name: DOWNSTREAM HOLMSLEY A35, AVON WATER
Environment Agency sampling point SO-G0009013 · 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
- 10 Sep 2026, 14:3721 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 4 since 3 Jun 2026 Imported periods: 1 Oct 2023 – 30 Sep 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Planned investigation (local monitoring)
- Where
- National Grid 423193, 100461As 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
- Avon WaterPlaced by position alone (the only river line close by), 7 m from the line.
- Next gauge downstream
- None tracedIts water reaches the sea without passing a gauge.
- Why it was sampled
- Planned investigation (local monitoring) (4 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
88.8%
Sampled 10 Sep 2026, 21 days ago · 4 results banked
Every result (4)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Sep 2026, 14:37 | 88.8 | 88.8% |
| 14 Aug 2026, 11:26 | 90.7 | 90.7% |
| 31 Jul 2026, 14:46 | 90.7 | 90.7% |
| 3 Jun 2026, 13:05 | 85.5 | 85.5% |
Dissolved oxygen
as O2 · code 9924 · mg/l
9.21 mg/l
Sampled 10 Sep 2026, 21 days ago · 4 results banked
Every result (4)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Sep 2026, 14:37 | 9.21 | 9.21 mg/l |
| 14 Aug 2026, 11:26 | 9.12 | 9.12 mg/l |
| 31 Jul 2026, 14:46 | 8.99 | 8.99 mg/l |
| 3 Jun 2026, 13:05 | 8.83 | 8.83 mg/l |
Water temperature
code 0076 · °C
13.6 °C
Sampled 10 Sep 2026, 21 days ago · 4 results banked
Every result (4)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Sep 2026, 14:37 | 13.6 | 13.6 °C |
| 14 Aug 2026, 11:26 | 15 | 15 °C |
| 31 Jul 2026, 14:46 | 15.7 | 15.7 °C |
| 3 Jun 2026, 13:05 | 13.8 | 13.8 °C |
pH
code 0061
6.72
Sampled 10 Sep 2026, 21 days ago · 4 results banked
Every result (4)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Sep 2026, 14:37 | 6.72 | 6.72 |
| 14 Aug 2026, 11:26 | 6.56 | 6.56 |
| 31 Jul 2026, 14:46 | 7.11 | 7.11 |
| 3 Jun 2026, 13:05 | 6.37 | 6.37 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.0034 mg/l
Sampled 10 Sep 2026, 21 days ago · 4 results banked
Every result (4)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Sep 2026, 14:37 | 0.0034 | 0.0034 mg/l |
| 14 Aug 2026, 11:26 | 0.0036 | 0.0036 mg/l |
| 31 Jul 2026, 14:46 | 0.0097 | 0.0097 mg/l |
| 3 Jun 2026, 13:05 | 0.011 | 0.011 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
0.368 mg/l
Sampled 10 Sep 2026, 21 days ago · 4 results banked
Every result (4)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Sep 2026, 14:37 | 0.368 | 0.368 mg/l |
| 14 Aug 2026, 11:26 | 0.489 | 0.489 mg/l |
| 31 Jul 2026, 14:46 | 0.489 | 0.489 mg/l |
| 3 Jun 2026, 13:05 | 0.239 | 0.239 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
below 0.002 mg/l (not detected above this)
Sampled 10 Sep 2026, 21 days ago · 4 results banked
Every result (4)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Sep 2026, 14:37 | <0.002 | below 0.002 mg/l (not detected above this) |
| 14 Aug 2026, 11:26 | 0.0013 | 0.0013 mg/l |
| 31 Jul 2026, 14:46 | 0.0013 | 0.0013 mg/l |
| 3 Jun 2026, 13:05 | 0.0026 | 0.0026 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
185 µS/cm
Sampled 10 Sep 2026, 21 days ago · 4 results banked
Every result (4)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Sep 2026, 14:37 | 185 | 185 µS/cm |
| 14 Aug 2026, 11:26 | 141 | 141 µS/cm |
| 31 Jul 2026, 14:46 | 205 | 205 µS/cm |
| 3 Jun 2026, 13:05 | 145 | 145 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 | 4 | Jun 2026 – Sep 2026 | 88.8% 10 Sep 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 4 | Jun 2026 – Sep 2026 | 9.21 mg/l 10 Sep 2026 |
| Temperature of Water 0076 | River water | 4 | Jun 2026 – Sep 2026 | 13.6 °C 10 Sep 2026 |
| pH 0061 | River water | 4 | Jun 2026 – Sep 2026 | 6.72 10 Sep 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 4 | Jun 2026 – Sep 2026 | 0.0034 mg/l 10 Sep 2026 |
| Nitrate as N 0117 | River water | 4 | Jun 2026 – Sep 2026 | 0.368 mg/l 10 Sep 2026 |
| Orthophosphate, reactive as P 0180 | River water | 4 | Jun 2026 – Sep 2026 | below 0.002 mg/l 10 Sep 2026 |
| Conductivity at 25 C 0077 | River water | 4 | Jun 2026 – Sep 2026 | 185 µS/cm 10 Sep 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 4 | Jun 2026 – Sep 2026 | 11 mg/l 10 Sep 2026 |
| Ammonia un-ionised as N 0119 | River water | 4 | Jun 2026 – Sep 2026 | below 0.00001 mg/l 10 Sep 2026 |
| BOD : 5 Day ATU 0085 | River water | 4 | Jun 2026 – Sep 2026 | below 3 mg/l 10 Sep 2026 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 4 | Jun 2026 – Sep 2026 | 3.7 mg/l 10 Sep 2026 |
| Nitrite as N 0118 | River water | 4 | Jun 2026 – Sep 2026 | below 0.002 mg/l 10 Sep 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 4 | Jun 2026 – Sep 2026 | 0.37 mg/l 10 Sep 2026 |
| Solids, Suspended at 105 C 0135 | River water | 4 | Jun 2026 – Sep 2026 | below 3 mg/l 10 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.