Yarrow / Lostock Catchment
EA name: YARROW / LOSTOCK CATCHMENT
Environment Agency sampling point NW-88023591 · 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
- 9 Jul 2026, 10:103 months ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 21 since 26 May 2024 Imported periods: 1 Oct 2023 – 30 Sep 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Unplanned reactive monitoring (pollution incidents)
- Where
- National Grid 500000, 4As 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
- 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
- Unplanned reactive monitoring (pollution incidents) (16 samples)
Unplanned reactive monitoring formal (pollution incidents) (5 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
68%
Sampled 25 Jan 2025, 20 months ago · 2 results banked
Also measured in percentage on another sample material (4ZZZ): 2 results, kept apart (see the table).
Also measured in percentage on another sample material (4BZZ): 1 result, kept apart (see the table).
Every result (2)
| Sampled | Result as published | Reads as |
|---|---|---|
| 25 Jan 2025, 14:46 | 68 | 68% |
| 13 Jul 2024, 10:30 | 93.9 | 93.9% |
Water temperature
code 0076 · °C
6.2 °C
Sampled 25 Jan 2025, 20 months ago · 2 results banked
Also measured in celsius on another sample material (4ZZZ): 2 results, kept apart (see the table).
Also measured in celsius on another sample material (4BZZ): 1 result, kept apart (see the table).
Every result (2)
| Sampled | Result as published | Reads as |
|---|---|---|
| 25 Jan 2025, 14:46 | 6.2 | 6.2 °C |
| 13 Jul 2024, 10:30 | 13.6 | 13.6 °C |
pH
code 0061
7.61
Sampled 25 Jan 2025, 20 months ago · 2 results banked
Also measured in ph units on another sample material (4ZZZ): 2 results, kept apart (see the table).
Also measured in ph units on another sample material (4BZZ): 1 result, kept apart (see the table).
Every result (2)
| Sampled | Result as published | Reads as |
|---|---|---|
| 25 Jan 2025, 14:46 | 7.61 | 7.61 |
| 13 Jul 2024, 10:30 | 7.96 | 7.96 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 9 Jul 2026, 3 months ago · 16 results banked
Also measured in milligram per litre on another sample material (4ZZZ): 2 results, kept apart (see the table).
Also measured in milligram per litre on another sample material (6ZZZ): 1 result, kept apart (see the table).
Also measured in milligram per litre on another sample material (4BZZ): 1 result, kept apart (see the table).
Every result (16)
| Sampled | Result as published | Reads as |
|---|---|---|
| 9 Jul 2026, 10:10 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Jul 2026, 10:05 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Jul 2026, 10:00 | <0.03 | below 0.03 mg/l (not detected above this) |
| 8 Jun 2026, 13:40 | 0.3 | 0.3 mg/l |
| 8 Jun 2026, 13:30 | 0.15 | 0.15 mg/l |
| 12 May 2026, 13:35 | 0.67 | 0.67 mg/l |
| 31 Mar 2026, 09:50 | <0.03 | below 0.03 mg/l (not detected above this) |
| 23 Jan 2026, 10:35 | 0.14 | 0.14 mg/l |
| 23 Jan 2026, 10:30 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 May 2025, 10:10 | 31 | 31 mg/l |
| 13 Mar 2025, 14:00 | 0.11 | 0.11 mg/l |
| 25 Jan 2025, 14:46 | 25 | 25 mg/l |
| 15 Nov 2024, 14:10 | 7.1 | 7.1 mg/l |
| 26 May 2024, 17:05 | 0.15 | 0.15 mg/l |
| 26 May 2024, 16:55 | 0.14 | 0.14 mg/l |
| 26 May 2024, 16:36 | 0.14 | 0.14 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.16 mg/l
Sampled 9 Jul 2026, 3 months ago · 16 results banked
Also measured in milligram per litre on another sample material (6ZZZ): 1 result, kept apart (see the table).
Also measured in milligram per litre on another sample material (4BZZ): 1 result, kept apart (see the table).
Every result (16)
| Sampled | Result as published | Reads as |
|---|---|---|
| 9 Jul 2026, 10:10 | 0.16 | 0.16 mg/l |
| 9 Jul 2026, 10:05 | 0.16 | 0.16 mg/l |
| 9 Jul 2026, 10:00 | 0.16 | 0.16 mg/l |
| 8 Jun 2026, 13:40 | 0.37 | 0.37 mg/l |
| 8 Jun 2026, 13:30 | 0.15 | 0.15 mg/l |
| 12 May 2026, 13:35 | <0.01 | below 0.01 mg/l (not detected above this) |
| 31 Mar 2026, 09:50 | 0.032 | 0.032 mg/l |
| 23 Jan 2026, 10:35 | 0.13 | 0.13 mg/l |
| 23 Jan 2026, 10:30 | 0.21 | 0.21 mg/l |
| 2 May 2025, 10:10 | 3.9 | 3.9 mg/l |
| 13 Mar 2025, 14:00 | 0.052 | 0.052 mg/l |
| 25 Jan 2025, 14:46 | 2.1 | 2.1 mg/l |
| 15 Nov 2024, 14:10 | 0.034 | 0.034 mg/l |
| 26 May 2024, 17:05 | 0.1 | 0.1 mg/l |
| 26 May 2024, 16:55 | 0.1 | 0.1 mg/l |
| 26 May 2024, 16:36 | 0.11 | 0.11 mg/l |
Turbidity
code 6396 · NTU
3.4 NTU
Sampled 31 Mar 2026, 6 months ago · 10 results banked
Every result (10)
| Sampled | Result as published | Reads as |
|---|---|---|
| 31 Mar 2026, 09:50 | 3.4 | 3.4 NTU |
| 23 Jan 2026, 10:35 | 18 | 18 NTU |
| 23 Jan 2026, 10:30 | 11 | 11 NTU |
| 2 May 2025, 10:10 | 50 | 50 NTU |
| 13 Mar 2025, 14:00 | 170 | 170 NTU |
| 25 Jan 2025, 14:46 | 23 | 23 NTU |
| 15 Nov 2024, 14:10 | 19 | 19 NTU |
| 26 May 2024, 17:05 | 23 | 23 NTU |
| 26 May 2024, 16:55 | 21 | 21 NTU |
| 26 May 2024, 16:36 | 21 | 21 NTU |
Conductivity
at 25 °C · code 0077 · µS/cm
653 µS/cm
Sampled 25 Jan 2025, 20 months ago · 1 result banked
Also measured in microsiemens per centimetre on another sample material (4ZZZ): 1 result, kept apart (see the table).
Also measured in microsiemens per centimetre on another sample material (4BZZ): 1 result, kept apart (see the table).
Every result (1)
| Sampled | Result as published | Reads as |
|---|---|---|
| 25 Jan 2025, 14:46 | 653 | 653 µS/cm |
E. coli
confirmed, membrane filtration · code 2348 · per 100 ml
26000 per 100 ml
Sampled 8 Jun 2026, 4 months ago · 2 results banked
Every result (2)
| Sampled | Result as published | Reads as |
|---|---|---|
| 8 Jun 2026, 13:40 | 26000 | 26000 per 100 ml |
| 8 Jun 2026, 13:30 | 30000 | 30000 per 100 ml |
Everything measured here
22 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 54 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 2 | Jul 2024 – Jan 2025 | 68% 25 Jan 2025 |
| Oxygen, Dissolved, % Saturation 9901 | Any sewage | 2 | Mar 2026 – Mar 2026 | 73.9% 26 Mar 2026 |
| Oxygen, Dissolved, % Saturation 9901 | Crude sewage | 1 | Jun 2026 – Jun 2026 | 41.6% 19 Jun 2026 |
| Temperature of Water 0076 | River water | 2 | Jul 2024 – Jan 2025 | 6.2 °C 25 Jan 2025 |
| Temperature of Water 0076 | Any sewage | 2 | Mar 2026 – Mar 2026 | 12 °C 26 Mar 2026 |
| Temperature of Water 0076 | Crude sewage | 1 | Jun 2026 – Jun 2026 | 15.9 °C 19 Jun 2026 |
| pH 0061 | River water | 2 | Jul 2024 – Jan 2025 | 7.61 25 Jan 2025 |
| pH 0061 | Any sewage | 2 | Mar 2026 – Mar 2026 | 7.33 26 Mar 2026 |
| pH 0061 | Crude sewage | 1 | Jun 2026 – Jun 2026 | 7.71 19 Jun 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 16 | May 2024 – Jul 2026 | below 0.03 mg/l 9 Jul 2026 |
| Ammoniacal Nitrogen as N 0111 | Any leachate | 1 | Feb 2025 – Feb 2025 | 420 mg/l 13 Feb 2025 |
| Ammoniacal Nitrogen as N 0111 | Any sewage | 2 | Mar 2026 – Mar 2026 | 9.7 mg/l 26 Mar 2026 |
| Ammoniacal Nitrogen as N 0111 | Crude sewage | 1 | Jun 2026 – Jun 2026 | 44 mg/l 19 Jun 2026 |
| Orthophosphate, reactive as P 0180 | River water | 16 | May 2024 – Jul 2026 | 0.16 mg/l 9 Jul 2026 |
| Orthophosphate, reactive as P 0180 | Any leachate | 1 | Feb 2025 – Feb 2025 | 0.92 mg/l 13 Feb 2025 |
| Orthophosphate, reactive as P 0180 | Crude sewage | 1 | Jun 2026 – Jun 2026 | 5.3 mg/l 19 Jun 2026 |
| Turbidity 6396 | River water | 10 | May 2024 – Mar 2026 | 3.4 NTU 31 Mar 2026 |
| Conductivity at 25 C 0077 | River water | 1 | Jan 2025 – Jan 2025 | 653 µS/cm 25 Jan 2025 |
| Conductivity at 25 C 0077 | Any sewage | 1 | Mar 2026 – Mar 2026 | 285.5 µS/cm 26 Mar 2026 |
| Conductivity at 25 C 0077 | Crude sewage | 1 | Jun 2026 – Jun 2026 | 1010 µS/cm 19 Jun 2026 |
| Escherichia coli : Confirmed : MF 2348 | River water | 2 | Jun 2026 – Jun 2026 | 26000 per 100 ml 8 Jun 2026 |
| Ammonia un-ionised as N 0119 | River water | 1 | Jan 2025 – Jan 2025 | 0.142 mg/l 25 Jan 2025 |
| BOD : 5 Day ATU 0085 | River water | 16 | May 2024 – Jul 2026 | 1.7 mg/l 9 Jul 2026 |
| Chemical Oxygen Demand :- {COD} 0092 | River water | 5 | Mar 2025 – Jul 2026 | 21 mg/l 9 Jul 2026 |
| Chloride 0172 | River water | 16 | May 2024 – Jul 2026 | 53 mg/l 9 Jul 2026 |
| Enterococci: Intestinal: Confirmed: MF 3723 | River water | 2 | Jun 2026 – Jun 2026 | 35000 colony forming units / 100ml 8 Jun 2026 |
| Enterococci: Intestinal: Presumptive: MF 3722 | River water | 2 | Jun 2026 – Jun 2026 | 50000 colony forming units / 100ml 8 Jun 2026 |
| GCMS Screen : Semi-Volatile Screen: Semi Quantitative 3106 | River water | 1 | Nov 2024 – Nov 2024 | 1 unitless value 15 Nov 2024 |
| National Grid Reference : Whole : Field report 7434 | River water | 9 | May 2024 – Jun 2026 | 1 unitless value 8 Jun 2026 |
| Nitrite as N 0118 | River water | 7 | Mar 2025 – Jul 2026 | below 0.004 mg/l 9 Jul 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 16 | May 2024 – Jul 2026 | 0.79 mg/l 9 Jul 2026 |
| Oil Type : Qualitative 3372 | River water | 1 | Nov 2024 – Nov 2024 | 1 unitless value 15 Nov 2024 |
| Oils, Grease and Fats 0666 | River water | 2 | Jul 2024 – Nov 2024 | below 1 mg/l 15 Nov 2024 |
| Salinity : In Situ 7608 | River water | 1 | Jan 2025 – Jan 2025 | 0.32 parts per thousand 25 Jan 2025 |
| Solids, Suspended at 105 C 0135 | River water | 7 | Mar 2025 – Jul 2026 | 32 mg/l 9 Jul 2026 |
| Ammonia un-ionised as N 0119 | Crude sewage | 1 | Jun 2026 – Jun 2026 | 0.642 mg/l 19 Jun 2026 |
| BOD : 5 Day ATU 0085 | Any leachate | 1 | Feb 2025 – Feb 2025 | 4400 mg/l 13 Feb 2025 |
| BOD : 5 Day ATU 0085 | Any sewage | 2 | Mar 2026 – Mar 2026 | 36 mg/l 26 Mar 2026 |
| BOD : 5 Day ATU 0085 | Crude sewage | 1 | Jun 2026 – Jun 2026 | 210 mg/l 19 Jun 2026 |
| Chemical Oxygen Demand :- {COD} 0092 | Any leachate | 1 | Feb 2025 – Feb 2025 | 2800 mg/l 13 Feb 2025 |
| Chemical Oxygen Demand :- {COD} 0092 | Any sewage | 2 | Mar 2026 – Mar 2026 | 190 mg/l 26 Mar 2026 |
| Chemical Oxygen Demand :- {COD} 0092 | Crude sewage | 1 | Jun 2026 – Jun 2026 | 380 mg/l 19 Jun 2026 |
| Chloride 0172 | Any leachate | 1 | Feb 2025 – Feb 2025 | 1100 mg/l 13 Feb 2025 |
| Chloride 0172 | Any sewage | 2 | Mar 2026 – Mar 2026 | 23 mg/l 26 Mar 2026 |
| Chloride 0172 | Crude sewage | 1 | Jun 2026 – Jun 2026 | 56 mg/l 19 Jun 2026 |
| National Grid Reference : Whole : Field report 7434 | Any sewage | 2 | Mar 2026 – Mar 2026 | 1 unitless value 26 Mar 2026 |
| National Grid Reference : Whole : Field report 7434 | Crude sewage | 1 | Jun 2026 – Jun 2026 | 1 unitless value 19 Jun 2026 |
| Nitrite as N 0118 | Crude sewage | 1 | Jun 2026 – Jun 2026 | below 0.1 mg/l 19 Jun 2026 |
| Nitrogen, Total Oxidised as N 0116 | Any leachate | 1 | Feb 2025 – Feb 2025 | below 1 mg/l 13 Feb 2025 |
| Nitrogen, Total Oxidised as N 0116 | Crude sewage | 1 | Jun 2026 – Jun 2026 | below 1 mg/l 19 Jun 2026 |
| Salinity : In Situ 7608 | Crude sewage | 1 | Jun 2026 – Jun 2026 | 0.5 parts per thousand 19 Jun 2026 |
| Solids, Suspended at 105 C 0135 | Any leachate | 1 | Feb 2025 – Feb 2025 | 400 mg/l 13 Feb 2025 |
| Solids, Suspended at 105 C 0135 | Any sewage | 2 | Mar 2026 – Mar 2026 | 310 mg/l 26 Mar 2026 |
| Solids, Suspended at 105 C 0135 | Crude sewage | 1 | Jun 2026 – Jun 2026 | 220 mg/l 19 Jun 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.