Nidd at Knaresborough Viaduct
EA name: NIDD AT KNARESBOROUGH VIADUCT
Environment Agency sampling point NE-49800260 · 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
- 14 Sep 2026, 12:1317 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 37 since 15 Jan 2025 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 434757, 457063As published, to the nearest 1 m. Open in a map
- River, by its own name
- Nidd
- River, by the map
- River NiddPlaced on the river its name gives, 21 m from the line.
- Next gauge downstream
- Hunsingore On the River Nidd · 18 km along the river
- Nearest gauge upstream
- Birstwith On the River Nidd · 17 km along the river
- Why it was sampled
- Planned investigation (local monitoring) (27 samples)
Monitoring (national agency policy) (10 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
96%
Sampled 10 Mar 2026, 7 months ago · 13 results banked
Every result (13)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Mar 2026, 14:40 | 96 | 96% |
| 18 Feb 2026, 14:45 | 100.1 | 100.1% |
| 23 Jan 2026, 13:47 | 96.1 | 96.1% |
| 22 Dec 2025, 16:00 | 95.8 | 95.8% |
| 17 Nov 2025, 14:52 | 101.8 | 101.8% |
| 20 Oct 2025, 14:50 | 94.4 | 94.4% |
| 18 Aug 2025, 14:47 | 81.1 | 81.1% |
| 18 Jun 2025, 13:57 | 66.7 | 66.7% |
| 6 May 2025, 14:19 | 83.7 | 83.7% |
| 22 Apr 2025, 14:10 | 93.4 | 93.4% |
| 18 Mar 2025, 13:50 | 97.2 | 97.2% |
| 25 Feb 2025, 14:41 | 100.6 | 100.6% |
| 15 Jan 2025, 15:45 | 99.6 | 99.6% |
Water temperature
code 0076 · °C
16.5 °C
Sampled 26 Aug 2026, 36 days ago · 15 results banked
Every result (15)
| Sampled | Result as published | Reads as |
|---|---|---|
| 26 Aug 2026, 14:34 | 16.5 | 16.5 °C |
| 15 Jul 2026, 15:02 | 19.9 | 19.9 °C |
| 10 Mar 2026, 14:40 | 8.7 | 8.7 °C |
| 18 Feb 2026, 14:45 | 4.4 | 4.4 °C |
| 23 Jan 2026, 13:47 | 5.9 | 5.9 °C |
| 22 Dec 2025, 16:00 | 8 | 8 °C |
| 17 Nov 2025, 14:52 | 7.8 | 7.8 °C |
| 20 Oct 2025, 14:50 | 11.5 | 11.5 °C |
| 18 Aug 2025, 14:47 | 17.9 | 17.9 °C |
| 18 Jun 2025, 13:57 | 19.6 | 19.6 °C |
| 6 May 2025, 14:19 | 12.9 | 12.9 °C |
| 22 Apr 2025, 14:10 | 12.2 | 12.2 °C |
| 18 Mar 2025, 13:50 | 6.9 | 6.9 °C |
| 25 Feb 2025, 14:41 | 6.9 | 6.9 °C |
| 15 Jan 2025, 15:45 | 4.9 | 4.9 °C |
pH
code 0061
7.9
Sampled 26 Aug 2026, 36 days ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 26 Aug 2026, 14:34 | 7.9 | 7.9 |
| 15 Jul 2026, 15:02 | 7.7 | 7.7 |
| 10 Jun 2026, 14:11 | 7.52 | 7.52 |
| 13 May 2026, 13:39 | 7.6 | 7.6 |
| 20 Apr 2026, 15:46 | 7.64 | 7.64 |
| 10 Mar 2026, 14:40 | 7.7 | 7.7 |
| 18 Feb 2026, 14:45 | 7.6 | 7.6 |
| 23 Jan 2026, 13:47 | 7.4 | 7.4 |
| 22 Dec 2025, 16:00 | 7.5 | 7.5 |
| 17 Nov 2025, 14:52 | 7.5 | 7.5 |
| 20 Oct 2025, 14:50 | 6.9 | 6.9 |
| 18 Aug 2025, 14:47 | 7.7 | 7.7 |
| 18 Jun 2025, 13:57 | 7.6 | 7.6 |
| 6 May 2025, 14:19 | 7.6 | 7.6 |
| 22 Apr 2025, 14:10 | 7.92 | 7.92 |
| 18 Mar 2025, 13:50 | 7.7 | 7.7 |
| 25 Feb 2025, 14:41 | 7.8 | 7.8 |
| 15 Jan 2025, 15:45 | 7.5 | 7.5 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 26 Aug 2026, 36 days ago · 7 results banked
Every result (7)
| Sampled | Result as published | Reads as |
|---|---|---|
| 26 Aug 2026, 14:34 | <0.03 | below 0.03 mg/l (not detected above this) |
| 15 Jul 2026, 15:02 | 0.036 | 0.036 mg/l |
| 10 Mar 2026, 14:40 | 0.052 | 0.052 mg/l |
| 22 Dec 2025, 16:00 | 0.071 | 0.071 mg/l |
| 20 Oct 2025, 14:50 | 0.046 | 0.046 mg/l |
| 18 Mar 2025, 13:50 | 0.26 | 0.26 mg/l |
| 15 Jan 2025, 15:45 | 0.064 | 0.064 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.067 mg/l
Sampled 26 Aug 2026, 36 days ago · 7 results banked
Every result (7)
| Sampled | Result as published | Reads as |
|---|---|---|
| 26 Aug 2026, 14:34 | 0.067 | 0.067 mg/l |
| 15 Jul 2026, 15:02 | 0.063 | 0.063 mg/l |
| 10 Mar 2026, 14:40 | 0.043 | 0.043 mg/l |
| 22 Dec 2025, 16:00 | 0.054 | 0.054 mg/l |
| 20 Oct 2025, 14:50 | 0.07 | 0.07 mg/l |
| 18 Mar 2025, 13:50 | 0.069 | 0.069 mg/l |
| 15 Jan 2025, 15:45 | 0.032 | 0.032 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
281 µS/cm
Sampled 26 Aug 2026, 36 days ago · 15 results banked
Every result (15)
| Sampled | Result as published | Reads as |
|---|---|---|
| 26 Aug 2026, 14:34 | 281 | 281 µS/cm |
| 15 Jul 2026, 15:02 | 262 | 262 µS/cm |
| 10 Mar 2026, 14:40 | 207 | 207 µS/cm |
| 18 Feb 2026, 14:45 | 164 | 164 µS/cm |
| 23 Jan 2026, 13:47 | 123 | 123 µS/cm |
| 22 Dec 2025, 16:00 | 160 | 160 µS/cm |
| 17 Nov 2025, 14:52 | 151 | 151 µS/cm |
| 20 Oct 2025, 14:50 | 193 | 193 µS/cm |
| 18 Aug 2025, 14:47 | 284 | 284 µS/cm |
| 18 Jun 2025, 13:57 | 257 | 257 µS/cm |
| 6 May 2025, 14:19 | 312 | 312 µS/cm |
| 22 Apr 2025, 14:10 | 315 | 315 µS/cm |
| 18 Mar 2025, 13:50 | 272 | 272 µS/cm |
| 25 Feb 2025, 14:41 | 190 | 190 µS/cm |
| 15 Jan 2025, 15:45 | 143 | 143 µS/cm |
E. coli
confirmed, membrane filtration · code 2348 · per 100 ml
1800 per 100 ml
Sampled 14 Sep 2026, 17 days ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Sep 2026, 12:13 | 1800 | 1800 per 100 ml |
| 11 Sep 2026, 11:50 | 780 | 780 per 100 ml |
| 1 Sep 2026, 12:30 | 280 | 280 per 100 ml |
| 27 Aug 2026, 13:20 | 530 | 530 per 100 ml |
| 21 Aug 2026, 12:26 | 2700 | 2700 per 100 ml |
| 11 Aug 2026, 12:19 | 710 | 710 per 100 ml |
| 6 Aug 2026, 13:15 | 370 | 370 per 100 ml |
| 30 Jul 2026, 12:27 | 270 | 270 per 100 ml |
| 22 Jul 2026, 13:20 | 230 | 230 per 100 ml |
| 12 Jul 2026, 12:27 | 230 | 230 per 100 ml |
| 6 Jul 2026, 14:07 | 1100 | 1100 per 100 ml |
| 2 Jul 2026, 12:34 | 690 | 690 per 100 ml |
| 24 Jun 2026, 12:15 | 710 | 710 per 100 ml |
| 16 Jun 2026, 13:56 | 640 | 640 per 100 ml |
| 11 Jun 2026, 12:36 | 500 | 500 per 100 ml |
| 28 May 2026, 14:45 | 1100 | 1100 per 100 ml |
| 23 May 2026, 12:09 | 1400 | 1400 per 100 ml |
| 18 May 2026, 12:41 | 1500 | 1500 per 100 ml |
Everything measured here
62 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 62 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 13 | Jan 2025 – Mar 2026 | 96% 10 Mar 2026 |
| Temperature of Water 0076 | River water | 15 | Jan 2025 – Aug 2026 | 16.5 °C 26 Aug 2026 |
| pH 0061 | River water | 18 | Jan 2025 – Aug 2026 | 7.9 26 Aug 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 7 | Jan 2025 – Aug 2026 | below 0.03 mg/l 26 Aug 2026 |
| Orthophosphate, reactive as P 0180 | River water | 7 | Jan 2025 – Aug 2026 | 0.067 mg/l 26 Aug 2026 |
| Conductivity at 25 C 0077 | River water | 15 | Jan 2025 – Aug 2026 | 281 µS/cm 26 Aug 2026 |
| Escherichia coli : Confirmed : MF 2348 | River water | 18 | May 2026 – Sep 2026 | 1800 per 100 ml 14 Sep 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 7 | Jan 2025 – Aug 2026 | 73 mg/l 26 Aug 2026 |
| Aluminium, Dissolved 6037 | River water | 4 | Apr 2026 – Jul 2026 | 25 µg/l 15 Jul 2026 |
| Barium 6062 | River water | 7 | Jan 2025 – Aug 2026 | 98 µg/l 26 Aug 2026 |
| Barium, Dissolved 9446 | River water | 14 | Jan 2025 – Aug 2026 | 93 µg/l 26 Aug 2026 |
| Boron 6059 | River water | 7 | Jan 2025 – Aug 2026 | below 100 µg/l 26 Aug 2026 |
| Boron, Dissolved 9447 | River water | 14 | Jan 2025 – Aug 2026 | below 100 µg/l 26 Aug 2026 |
| Cadmium 0108 | River water | 15 | Jan 2025 – Aug 2026 | 0.055 µg/l 26 Aug 2026 |
| Cadmium, Dissolved 0106 | River water | 18 | Jan 2025 – Aug 2026 | 0.032 µg/l 26 Aug 2026 |
| Calcium 0241 | River water | 8 | Jan 2025 – Aug 2026 | 28 mg/l 26 Aug 2026 |
| Calcium, Dissolved 0239 | River water | 17 | Jan 2025 – Aug 2026 | 27 mg/l 26 Aug 2026 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 18 | Jan 2025 – Aug 2026 | 5.8 mg/l 26 Aug 2026 |
| Chloride 0172 | River water | 7 | Jan 2025 – Aug 2026 | 21 mg/l 26 Aug 2026 |
| Chromium 3164 | River water | 7 | Jan 2025 – Aug 2026 | below 0.5 µg/l 26 Aug 2026 |
| Chromium, Dissolved 3409 | River water | 10 | Jan 2025 – Aug 2026 | below 0.5 µg/l 26 Aug 2026 |
| Copper 6452 | River water | 15 | Jan 2025 – Aug 2026 | 1.1 µg/l 26 Aug 2026 |
| Copper : BLM Bioavailable 4821 | River water | 7 | Jan 2025 – Aug 2026 | 0.05 µg/l 26 Aug 2026 |
| Copper, Dissolved 6450 | River water | 18 | Jan 2025 – Aug 2026 | 0.97 µg/l 26 Aug 2026 |
| Enterococci: Intestinal: Confirmed: MF 3723 | River water | 18 | May 2026 – Sep 2026 | 170 colony forming units / 100ml 14 Sep 2026 |
| Enterococci: Intestinal: Presumptive: MF 3722 | River water | 18 | May 2026 – Sep 2026 | 190 colony forming units / 100ml 14 Sep 2026 |
| Hardness, Total as CaCO3 0158 | River water | 15 | Jan 2025 – Aug 2026 | 97.1 mg/l 26 Aug 2026 |
| Ionic Balance 7044 | River water | 7 | Jan 2025 – Aug 2026 | 1.65% 26 Aug 2026 |
| Iron 6051 | River water | 7 | Jan 2025 – Aug 2026 | 300 µg/l 26 Aug 2026 |
| Iron, Dissolved 6460 | River water | 14 | Jan 2025 – Aug 2026 | 160 µg/l 26 Aug 2026 |
| Lead 0050 | River water | 15 | Jan 2025 – Aug 2026 | 3 µg/l 26 Aug 2026 |
| Lead : BLM Bioavailable 3377 | River water | 7 | Jan 2025 – Aug 2026 | 0.21 µg/l 26 Aug 2026 |
| Lead, Dissolved 0052 | River water | 18 | Jan 2025 – Aug 2026 | 1.2 µg/l 26 Aug 2026 |
| Lithium 6064 | River water | 7 | Jan 2025 – Aug 2026 | below 100 µg/l 26 Aug 2026 |
| Lithium, Dissolved 4201 | River water | 14 | Jan 2025 – Aug 2026 | below 100 µg/l 26 Aug 2026 |
| Magnesium 0237 | River water | 8 | Jan 2025 – Aug 2026 | 7.3 mg/l 26 Aug 2026 |
| Magnesium, Dissolved 0235 | River water | 17 | Jan 2025 – Aug 2026 | 7.2 mg/l 26 Aug 2026 |
| Manganese 6050 | River water | 7 | Jan 2025 – Aug 2026 | 43 µg/l 26 Aug 2026 |
| Manganese : BLM Bioavailable 4820 | River water | 7 | Jan 2025 – Aug 2026 | 26 µg/l 26 Aug 2026 |
| Manganese, Dissolved 6458 | River water | 15 | Jan 2025 – Aug 2026 | 30 µg/l 26 Aug 2026 |
| MST Filtration 4926 | River water | 19 | May 2026 – Sep 2026 | DNA Stored 14 Sep 2026 |
| National Grid Reference : Whole : Field report 7434 | River water | 9 | Jan 2025 – Mar 2026 | 1 unitless value 10 Mar 2026 |
| Nickel 6462 | River water | 15 | Jan 2025 – Aug 2026 | 1.3 µg/l 26 Aug 2026 |
| Nickel : BLM Bioavailable 3878 | River water | 7 | Jan 2025 – Aug 2026 | 0.49 µg/l 26 Aug 2026 |
| Nickel, Dissolved 3410 | River water | 18 | Jan 2025 – Aug 2026 | 1.2 µg/l 26 Aug 2026 |
| Nitrite as N 0118 | River water | 7 | Jan 2025 – Aug 2026 | 0.039 mg/l 26 Aug 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 7 | Jan 2025 – Aug 2026 | 2.6 mg/l 26 Aug 2026 |
| pH : In Situ 3169 | River water | 10 | Feb 2025 – Mar 2026 | 7.77 10 Mar 2026 |
| Potassium 0211 | River water | 7 | Jan 2025 – Aug 2026 | 3.6 mg/l 26 Aug 2026 |
| Potassium, Dissolved 0209 | River water | 14 | Jan 2025 – Aug 2026 | 3.5 mg/l 26 Aug 2026 |
| Silica, reactive as SiO2 0182 | River water | 7 | Jan 2025 – Aug 2026 | 4.3 mg/l 26 Aug 2026 |
| Sodium 0207 | River water | 7 | Jan 2025 – Aug 2026 | 16 mg/l 26 Aug 2026 |
| Sodium, Dissolved 0205 | River water | 14 | Jan 2025 – Aug 2026 | 16 mg/l 26 Aug 2026 |
| Solids, Suspended at 105 C 0135 | River water | 15 | Jan 2025 – Aug 2026 | 3.2 mg/l 26 Aug 2026 |
| Strontium 6063 | River water | 7 | Jan 2025 – Aug 2026 | 170 µg/l 26 Aug 2026 |
| Strontium, Filtered 6693 | River water | 14 | Jan 2025 – Aug 2026 | 160 µg/l 26 Aug 2026 |
| Sulphate as SO4 0183 | River water | 7 | Jan 2025 – Aug 2026 | 22 mg/l 26 Aug 2026 |
| Sulphate, Dissolved as SO4 7859 | River water | 14 | Jan 2025 – Aug 2026 | 22 mg/l 26 Aug 2026 |
| Volume of Sample Filtered 4865 | River water | 19 | May 2026 – Sep 2026 | 900 millilitre 14 Sep 2026 |
| Zinc 6455 | River water | 15 | Jan 2025 – Aug 2026 | 8.8 µg/l 26 Aug 2026 |
| Zinc : BLM Bioavailable 4822 | River water | 7 | Jan 2025 – Aug 2026 | 3.5 µg/l 26 Aug 2026 |
| Zinc, Dissolved 3408 | River water | 18 | Jan 2025 – Aug 2026 | 10 µg/l 26 Aug 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.