Grendon Brook Yardley Hastings
EA name: SSN1739 GRENDON BROOK YARDLEY HASTINGS (also listed as “SSN1739 GRENDON BROOK AT YARDLEY HASTINGS”)
Environment Agency sampling point AN-SSN1739 · 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
- 17 Sep 2026, 11:4814 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 11 since 20 Jan 2026 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) · results completed 19 Sep 2026
- Where
- National Grid 486595, 256888As published, to the nearest 1 m. Open in a map
- River, by its own name
- Grendon Brook
- River, by the map
- Grendon BrookPlaced on the river its name gives, 2 m from the line.
- Next gauge downstream
- Islip Sluice On the River Nene · 38 km along the river (the path rests on a repair to the map)
- Why it was sampled
- Monitoring (national agency policy) (11 samples)
Results here were completed a median of 9 days after the sample was taken (2 to 45 days, 11 samples). 3 visits found no water to sample (recorded as “No flow”).
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
68.5%
Sampled 3 Jul 2026, 3 months ago · 7 results banked
Every result (7)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Jul 2026, 10:45 | 68.5 | 68.5% |
| 3 Jun 2026, 12:10 | 65.4 | 65.4% |
| 28 May 2026, 12:56 | 87.4 | 87.4% |
| 22 May 2026, 10:08 | 81.2 | 81.2% |
| 3 Mar 2026, 11:47 | 103.2 | 103.2% |
| 4 Feb 2026, 10:37 | 102 | 102% |
| 20 Jan 2026, 11:46 | 100.1 | 100.1% |
Dissolved oxygen
as O2 · code 9924 · mg/l
6.68 mg/l
Sampled 3 Jul 2026, 3 months ago · 7 results banked
Every result (7)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Jul 2026, 10:45 | 6.68 | 6.68 mg/l |
| 3 Jun 2026, 12:10 | 6.6 | 6.6 mg/l |
| 28 May 2026, 12:56 | 7.83 | 7.83 mg/l |
| 22 May 2026, 10:08 | 8.11 | 8.11 mg/l |
| 3 Mar 2026, 11:47 | 12.1 | 12.1 mg/l |
| 4 Feb 2026, 10:37 | 12.6 | 12.6 mg/l |
| 20 Jan 2026, 11:46 | 12.1 | 12.1 mg/l |
Water temperature
code 0076 · °C
16.4 °C
Sampled 3 Jul 2026, 3 months ago · 7 results banked
Every result (7)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Jul 2026, 10:45 | 16.4 | 16.4 °C |
| 3 Jun 2026, 12:10 | 14.8 | 14.8 °C |
| 28 May 2026, 12:56 | 20.6 | 20.6 °C |
| 22 May 2026, 10:08 | 15.3 | 15.3 °C |
| 3 Mar 2026, 11:47 | 8.5 | 8.5 °C |
| 4 Feb 2026, 10:37 | 6.2 | 6.2 °C |
| 20 Jan 2026, 11:46 | 7 | 7 °C |
pH
code 0061
7.76
Sampled 3 Jul 2026, 3 months ago · 7 results banked
Every result (7)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Jul 2026, 10:45 | 7.76 | 7.76 |
| 3 Jun 2026, 12:10 | 7.32 | 7.32 |
| 28 May 2026, 12:56 | 7.63 | 7.63 |
| 22 May 2026, 10:08 | 7.59 | 7.59 |
| 3 Mar 2026, 11:47 | 8.3 | 8.3 |
| 4 Feb 2026, 10:37 | 8.37 | 8.37 |
| 20 Jan 2026, 11:46 | 8.12 | 8.12 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.12 mg/l
Sampled 3 Jul 2026, 3 months ago · 7 results banked
Every result (7)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Jul 2026, 10:45 | 0.12 | 0.12 mg/l |
| 3 Jun 2026, 12:10 | 0.14 | 0.14 mg/l |
| 28 May 2026, 12:56 | 0.3 | 0.3 mg/l |
| 22 May 2026, 10:08 | 0.18 | 0.18 mg/l |
| 3 Mar 2026, 11:47 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Feb 2026, 10:37 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 Jan 2026, 11:46 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
0.564 mg/l
Sampled 3 Jul 2026, 3 months ago · 7 results banked
Every result (7)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Jul 2026, 10:45 | 0.564 | 0.564 mg/l |
| 3 Jun 2026, 12:10 | 0.783 | 0.783 mg/l |
| 28 May 2026, 12:56 | 0.612 | 0.612 mg/l |
| 22 May 2026, 10:08 | 0.798 | 0.798 mg/l |
| 3 Mar 2026, 11:47 | 8.6 | 8.6 mg/l |
| 4 Feb 2026, 10:37 | 14 | 14 mg/l |
| 20 Jan 2026, 11:46 | 17 | 17 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.41 mg/l
Sampled 3 Jul 2026, 3 months ago · 7 results banked
Every result (7)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Jul 2026, 10:45 | 0.41 | 0.41 mg/l |
| 3 Jun 2026, 12:10 | 0.16 | 0.16 mg/l |
| 28 May 2026, 12:56 | 0.33 | 0.33 mg/l |
| 22 May 2026, 10:08 | 0.18 | 0.18 mg/l |
| 3 Mar 2026, 11:47 | 0.055 | 0.055 mg/l |
| 4 Feb 2026, 10:37 | 0.041 | 0.041 mg/l |
| 20 Jan 2026, 11:46 | 0.055 | 0.055 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
922 µS/cm
Sampled 3 Jul 2026, 3 months ago · 7 results banked
Every result (7)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Jul 2026, 10:45 | 922 | 922 µS/cm |
| 3 Jun 2026, 12:10 | 671 | 671 µS/cm |
| 28 May 2026, 12:56 | 809 | 809 µS/cm |
| 22 May 2026, 10:08 | 824 | 824 µS/cm |
| 3 Mar 2026, 11:47 | 613 | 613 µS/cm |
| 4 Feb 2026, 10:37 | 580 | 580 µS/cm |
| 20 Jan 2026, 11:46 | 633 | 633 µS/cm |
Everything measured here
49 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 49 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 7 | Jan 2026 – Jul 2026 | 68.5% 3 Jul 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 7 | Jan 2026 – Jul 2026 | 6.68 mg/l 3 Jul 2026 |
| Temperature of Water 0076 | River water | 7 | Jan 2026 – Jul 2026 | 16.4 °C 3 Jul 2026 |
| pH 0061 | River water | 7 | Jan 2026 – Jul 2026 | 7.76 3 Jul 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 7 | Jan 2026 – Jul 2026 | 0.12 mg/l 3 Jul 2026 |
| Nitrate as N 0117 | River water | 7 | Jan 2026 – Jul 2026 | 0.564 mg/l 3 Jul 2026 |
| Orthophosphate, reactive as P 0180 | River water | 7 | Jan 2026 – Jul 2026 | 0.41 mg/l 3 Jul 2026 |
| Conductivity at 25 C 0077 | River water | 7 | Jan 2026 – Jul 2026 | 922 µS/cm 3 Jul 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 7 | Jan 2026 – Jul 2026 | 320 mg/l 3 Jul 2026 |
| Aluminium, Dissolved 6037 | River water | 1 | Jan 2026 – Jan 2026 | below 20 µg/l 20 Jan 2026 |
| Aminomethylphosphonic acid 7125 | River water | 3 | Jan 2026 – Mar 2026 | below 0.1 µg/l 3 Mar 2026 |
| Ammonia un-ionised as N 0119 | River water | 7 | Jan 2026 – Jul 2026 | 0.00203 mg/l 3 Jul 2026 |
| Barium, Dissolved 9446 | River water | 1 | Jan 2026 – Jan 2026 | 19 µg/l 20 Jan 2026 |
| Boron, Dissolved 9447 | River water | 1 | Jan 2026 – Jan 2026 | below 100 µg/l 20 Jan 2026 |
| Cadmium, Dissolved 0106 | River water | 1 | Jan 2026 – Jan 2026 | below 0.01 µg/l 20 Jan 2026 |
| Calcium, Dissolved 0239 | River water | 1 | Jan 2026 – Jan 2026 | 110 mg/l 20 Jan 2026 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 7 | Jan 2026 – Jul 2026 | 4.4 mg/l 3 Jul 2026 |
| Chloride 0172 | River water | 7 | Jan 2026 – Jul 2026 | 42 mg/l 3 Jul 2026 |
| Chromium, Dissolved 3409 | River water | 1 | Jan 2026 – Jan 2026 | below 0.5 µg/l 20 Jan 2026 |
| Copper : BLM Bioavailable 4821 | River water | 1 | Jan 2026 – Jan 2026 | 0.15 µg/l 20 Jan 2026 |
| Copper, Dissolved 6450 | River water | 1 | Jan 2026 – Jan 2026 | 2.7 µg/l 20 Jan 2026 |
| Flow Type 2896 | River water | 9 | Jan 2026 – Sep 2026 | Ponded / Still 17 Sep 2026 |
| GCMS Screen : Target Based multi-residue screening : Semi Quantitative 4994 | River water | 1 | May 2026 – May 2026 | 1 text result 22 May 2026 |
| Glyphosate 3007 | River water | 3 | Jan 2026 – Mar 2026 | below 0.1 µg/l 3 Mar 2026 |
| Hardness, Calcium 0163 | River water | 1 | Jan 2026 – Jan 2026 | 275 mg/l 20 Jan 2026 |
| Hardness, Total as CaCO3 0158 | River water | 1 | Jan 2026 – Jan 2026 | 306 mg/l 20 Jan 2026 |
| Iron, Dissolved 6460 | River water | 1 | Jan 2026 – Jan 2026 | below 30 µg/l 20 Jan 2026 |
| LCMS Screen : Semi Quantitative 7299 | River water | 2 | Feb 2026 – May 2026 | 1 text result 22 May 2026 |
| Lead : BLM Bioavailable 3377 | River water | 1 | Jan 2026 – Jan 2026 | 0.01 µg/l 20 Jan 2026 |
| Lead, Dissolved 0052 | River water | 1 | Jan 2026 – Jan 2026 | below 0.1 µg/l 20 Jan 2026 |
| Lithium, Dissolved 4201 | River water | 1 | Jan 2026 – Jan 2026 | below 100 µg/l 20 Jan 2026 |
| Magnesium, Dissolved 0235 | River water | 1 | Jan 2026 – Jan 2026 | 7.5 mg/l 20 Jan 2026 |
| Manganese : BLM Bioavailable 4820 | River water | 1 | Jan 2026 – Jan 2026 | 3.5 µg/l 20 Jan 2026 |
| Manganese, Dissolved 6458 | River water | 1 | Jan 2026 – Jan 2026 | below 10 µg/l 20 Jan 2026 |
| Nickel : BLM Bioavailable 3878 | River water | 1 | Jan 2026 – Jan 2026 | 0.48 µg/l 20 Jan 2026 |
| Nickel, Dissolved 3410 | River water | 1 | Jan 2026 – Jan 2026 | 1.3 µg/l 20 Jan 2026 |
| Nitrite as N 0118 | River water | 7 | Jan 2026 – Jul 2026 | 0.056 mg/l 3 Jul 2026 |
| Nitrogen, Total as N 9686 | River water | 7 | Jan 2026 – Jul 2026 | 2 mg/l 3 Jul 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 7 | Jan 2026 – Jul 2026 | 0.62 mg/l 3 Jul 2026 |
| No flow /No sample 7668 | River water | 3 | Jul 2026 – Sep 2026 | No flow/discharge at sampling point 17 Sep 2026 |
| Phosphorus, Total as P 0348 | River water | 7 | Jan 2026 – Jul 2026 | 0.65 mg/l 3 Jul 2026 |
| Potassium, Dissolved 0209 | River water | 1 | Jan 2026 – Jan 2026 | 1.8 mg/l 20 Jan 2026 |
| Silica, reactive as SiO2 0182 | River water | 7 | Jan 2026 – Jul 2026 | 14 mg/l 3 Jul 2026 |
| Sodium, Dissolved 0205 | River water | 1 | Jan 2026 – Jan 2026 | 12 mg/l 20 Jan 2026 |
| Solids, Suspended at 105 C 0135 | River water | 7 | Jan 2026 – Jul 2026 | 66 mg/l 3 Jul 2026 |
| Strontium, Filtered 6693 | River water | 1 | Jan 2026 – Jan 2026 | 360 µg/l 20 Jan 2026 |
| Sulphate, Dissolved as SO4 7859 | River water | 1 | Jan 2026 – Jan 2026 | 75 mg/l 20 Jan 2026 |
| Zinc : BLM Bioavailable 4822 | River water | 1 | Jan 2026 – Jan 2026 | 0.68 µg/l 20 Jan 2026 |
| Zinc, Dissolved 3408 | River water | 1 | Jan 2026 – Jan 2026 | 2.1 µg/l 20 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.