Autherd Drain near Walkington
EA name: SSN1617 AUTHERD DRAIN NEAR WALKINGTON
Environment Agency sampling point NE-SSN1617 · 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
- 1 Sep 2026, 09:3530 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 25 since 14 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 501705, 437118As published, to the nearest 1 m. Open in a map
- River, by its own name
- Autherd Drain
- 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) (25 samples)
20 visits found no water to sample (recorded as “No flow”).
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
96.7%
Sampled 3 Feb 2026, 8 months ago · 5 results banked
Every result (5)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Feb 2026, 13:50 | 96.7 | 96.7% |
| 13 Jan 2026, 10:35 | 99.9 | 99.9% |
| 13 Mar 2025, 08:31 | 90.4 | 90.4% |
| 7 Feb 2025, 08:38 | 59.5 | 59.5% |
| 14 Jan 2025, 08:56 | 103 | 103% |
Dissolved oxygen
as O2 · code 9924 · mg/l
12.6 mg/l
Sampled 3 Feb 2026, 8 months ago · 5 results banked
Every result (5)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Feb 2026, 13:50 | 12.6 | 12.6 mg/l |
| 13 Jan 2026, 10:35 | 12.6 | 12.6 mg/l |
| 13 Mar 2025, 08:31 | 12 | 12 mg/l |
| 7 Feb 2025, 08:38 | 7.89 | 7.89 mg/l |
| 14 Jan 2025, 08:56 | 13.3 | 13.3 mg/l |
Water temperature
code 0076 · °C
4.2 °C
Sampled 3 Feb 2026, 8 months ago · 5 results banked
Every result (5)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Feb 2026, 13:50 | 4.2 | 4.2 °C |
| 13 Jan 2026, 10:35 | 5.5 | 5.5 °C |
| 13 Mar 2025, 08:31 | 3.6 | 3.6 °C |
| 7 Feb 2025, 08:38 | 3.5 | 3.5 °C |
| 14 Jan 2025, 08:56 | 4.5 | 4.5 °C |
pH
code 0061
8.41
Sampled 3 Feb 2026, 8 months ago · 5 results banked
Every result (5)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Feb 2026, 13:50 | 8.41 | 8.41 |
| 13 Jan 2026, 10:35 | 8.25 | 8.25 |
| 13 Mar 2025, 08:31 | 8.11 | 8.11 |
| 7 Feb 2025, 08:38 | 7.65 | 7.65 |
| 14 Jan 2025, 08:56 | 7.43 | 7.43 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 3 Feb 2026, 8 months ago · 5 results banked
Every result (5)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Feb 2026, 13:50 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 Jan 2026, 10:35 | 0.05 | 0.05 mg/l |
| 13 Mar 2025, 08:31 | 0.11 | 0.11 mg/l |
| 7 Feb 2025, 08:38 | <0.03 | below 0.03 mg/l (not detected above this) |
| 14 Jan 2025, 08:56 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
7 mg/l
Sampled 3 Feb 2026, 8 months ago · 5 results banked
Every result (5)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Feb 2026, 13:50 | 7 | 7 mg/l |
| 13 Jan 2026, 10:35 | 5.7 | 5.7 mg/l |
| 13 Mar 2025, 08:31 | 2.08 | 2.08 mg/l |
| 7 Feb 2025, 08:38 | 12 | 12 mg/l |
| 14 Jan 2025, 08:56 | 9.8 | 9.8 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.1 mg/l
Sampled 3 Feb 2026, 8 months ago · 5 results banked
Every result (5)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Feb 2026, 13:50 | 0.1 | 0.1 mg/l |
| 13 Jan 2026, 10:35 | 0.15 | 0.15 mg/l |
| 13 Mar 2025, 08:31 | 0.21 | 0.21 mg/l |
| 7 Feb 2025, 08:38 | 0.11 | 0.11 mg/l |
| 14 Jan 2025, 08:56 | 0.1 | 0.1 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
544 µS/cm
Sampled 3 Feb 2026, 8 months ago · 5 results banked
Every result (5)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Feb 2026, 13:50 | 544 | 544 µS/cm |
| 13 Jan 2026, 10:35 | 484 | 484 µS/cm |
| 13 Mar 2025, 08:31 | 368 | 368 µS/cm |
| 7 Feb 2025, 08:38 | 614 | 614 µS/cm |
| 14 Jan 2025, 08:56 | 614 | 614 µS/cm |
Everything measured here
47 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 47 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 5 | Jan 2025 – Feb 2026 | 96.7% 3 Feb 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 5 | Jan 2025 – Feb 2026 | 12.6 mg/l 3 Feb 2026 |
| Temperature of Water 0076 | River water | 5 | Jan 2025 – Feb 2026 | 4.2 °C 3 Feb 2026 |
| pH 0061 | River water | 5 | Jan 2025 – Feb 2026 | 8.41 3 Feb 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 5 | Jan 2025 – Feb 2026 | below 0.03 mg/l 3 Feb 2026 |
| Nitrate as N 0117 | River water | 5 | Jan 2025 – Feb 2026 | 7 mg/l 3 Feb 2026 |
| Orthophosphate, reactive as P 0180 | River water | 5 | Jan 2025 – Feb 2026 | 0.1 mg/l 3 Feb 2026 |
| Conductivity at 25 C 0077 | River water | 5 | Jan 2025 – Feb 2026 | 544 µS/cm 3 Feb 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 5 | Jan 2025 – Feb 2026 | 180 mg/l 3 Feb 2026 |
| Aluminium, Dissolved 6037 | River water | 1 | Jan 2026 – Jan 2026 | 1100 µg/l 13 Jan 2026 |
| Aminomethylphosphonic acid 7125 | River water | 2 | Jan 2026 – Feb 2026 | 0.28 µg/l 3 Feb 2026 |
| Ammonia un-ionised as N 0119 | River water | 5 | Jan 2025 – Feb 2026 | below 0.00036 mg/l 3 Feb 2026 |
| Barium, Dissolved 9446 | River water | 1 | Jan 2026 – Jan 2026 | 39 µg/l 13 Jan 2026 |
| Boron, Dissolved 9447 | River water | 1 | Jan 2026 – Jan 2026 | below 100 µg/l 13 Jan 2026 |
| Cadmium, Dissolved 0106 | River water | 1 | Jan 2026 – Jan 2026 | 0.021 µg/l 13 Jan 2026 |
| Calcium, Dissolved 0239 | River water | 1 | Jan 2026 – Jan 2026 | 66 mg/l 13 Jan 2026 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 5 | Jan 2025 – Feb 2026 | 1.7 mg/l 3 Feb 2026 |
| Chloride 0172 | River water | 5 | Jan 2025 – Feb 2026 | 35 mg/l 3 Feb 2026 |
| Chromium, Dissolved 3409 | River water | 1 | Jan 2026 – Jan 2026 | 2 µg/l 13 Jan 2026 |
| Copper : BLM Bioavailable 4821 | River water | 1 | Jan 2026 – Jan 2026 | 0.54 µg/l 13 Jan 2026 |
| Copper, Dissolved 6450 | River water | 1 | Jan 2026 – Jan 2026 | 6.6 µg/l 13 Jan 2026 |
| Flow Type 2896 | River water | 18 | Jan 2025 – Sep 2026 | Dry 1 Sep 2026 |
| Glyphosate 3007 | River water | 2 | Jan 2026 – Feb 2026 | 0.15 µg/l 3 Feb 2026 |
| Hardness, Calcium 0163 | River water | 1 | Jan 2026 – Jan 2026 | 165 mg/l 13 Jan 2026 |
| Hardness, Total as CaCO3 0158 | River water | 1 | Jan 2026 – Jan 2026 | 186 mg/l 13 Jan 2026 |
| Iron, Dissolved 6460 | River water | 1 | Jan 2026 – Jan 2026 | 1500 µg/l 13 Jan 2026 |
| Lead : BLM Bioavailable 3377 | River water | 1 | Jan 2026 – Jan 2026 | 0.47 µg/l 13 Jan 2026 |
| Lead, Dissolved 0052 | River water | 1 | Jan 2026 – Jan 2026 | 2.5 µg/l 13 Jan 2026 |
| Lithium, Dissolved 4201 | River water | 1 | Jan 2026 – Jan 2026 | below 100 µg/l 13 Jan 2026 |
| Magnesium, Dissolved 0235 | River water | 1 | Jan 2026 – Jan 2026 | 5.1 mg/l 13 Jan 2026 |
| Manganese : BLM Bioavailable 4820 | River water | 1 | Jan 2026 – Jan 2026 | 10 µg/l 13 Jan 2026 |
| Manganese, Dissolved 6458 | River water | 1 | Jan 2026 – Jan 2026 | 10 µg/l 13 Jan 2026 |
| Nickel : BLM Bioavailable 3878 | River water | 1 | Jan 2026 – Jan 2026 | 1 µg/l 13 Jan 2026 |
| Nickel, Dissolved 3410 | River water | 1 | Jan 2026 – Jan 2026 | 2.2 µg/l 13 Jan 2026 |
| Nitrite as N 0118 | River water | 5 | Jan 2025 – Feb 2026 | below 0.004 mg/l 3 Feb 2026 |
| Nitrogen, Total as N 9686 | River water | 5 | Jan 2025 – Feb 2026 | 7.9 mg/l 3 Feb 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 5 | Jan 2025 – Feb 2026 | 7 mg/l 3 Feb 2026 |
| No flow /No sample 7668 | River water | 20 | Mar 2025 – Sep 2026 | No flow/discharge at sampling point 1 Sep 2026 |
| Phosphorus, Total as P 0348 | River water | 5 | Jan 2025 – Feb 2026 | 0.14 mg/l 3 Feb 2026 |
| Potassium, Dissolved 0209 | River water | 1 | Jan 2026 – Jan 2026 | 3.9 mg/l 13 Jan 2026 |
| Silica, reactive as SiO2 0182 | River water | 5 | Jan 2025 – Feb 2026 | 8.6 mg/l 3 Feb 2026 |
| Sodium, Dissolved 0205 | River water | 1 | Jan 2026 – Jan 2026 | 24 mg/l 13 Jan 2026 |
| Solids, Suspended at 105 C 0135 | River water | 5 | Jan 2025 – Feb 2026 | 28 mg/l 3 Feb 2026 |
| Strontium, Filtered 6693 | River water | 1 | Jan 2026 – Jan 2026 | 140 µg/l 13 Jan 2026 |
| Sulphate, Dissolved as SO4 7859 | River water | 1 | Jan 2026 – Jan 2026 | 27 mg/l 13 Jan 2026 |
| Zinc : BLM Bioavailable 4822 | River water | 1 | Jan 2026 – Jan 2026 | 3.3 µg/l 13 Jan 2026 |
| Zinc, Dissolved 3408 | River water | 1 | Jan 2026 – Jan 2026 | 9.1 µg/l 13 Jan 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.