Mother Drain, downstream of Balby sewage treatment works
EA name: MOTHER DRAIN, DS BALBY STW
Environment Agency sampling point MD-27300202 · 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
- 11 Aug 2026, 07:3051 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 29 since 2 Oct 2023 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 457361, 401418As published, to the nearest 1 m. Open in a map
- River, by its own name
- Mother 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
- Planned investigation (local monitoring) (29 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
75.8%
Sampled 11 Aug 2026, 51 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 Aug 2026, 07:30 | 75.8 | 75.8% |
| 7 May 2026, 11:12 | 81.7 | 81.7% |
| 4 Feb 2026, 14:13 | 73.1 | 73.1% |
| 2 Dec 2025, 08:10 | 82.4 | 82.4% |
| 5 Nov 2025, 08:55 | 76.5 | 76.5% |
| 13 Oct 2025, 15:57 | 77.9 | 77.9% |
| 4 Sep 2025, 14:16 | 72.7 | 72.7% |
| 4 Aug 2025, 16:20 | 88.4 | 88.4% |
| 4 Jul 2025, 07:34 | 75.7 | 75.7% |
| 4 Jun 2025, 09:13 | 66.9 | 66.9% |
| 14 May 2025, 07:31 | 77.7 | 77.7% |
| 23 Apr 2025, 12:14 | 85.1 | 85.1% |
| 4 Mar 2025, 11:11 | 88.2 | 88.2% |
| 5 Feb 2025, 07:37 | 85.1 | 85.1% |
| 13 Jan 2025, 07:45 | 82 | 82% |
| 6 Dec 2024, 08:34 | 88 | 88% |
| 4 Nov 2024, 07:30 | 81 | 81% |
| 2 Oct 2024, 08:10 | 69.3 | 69.3% |
| 6 Sep 2024, 07:29 | 72.4 | 72.4% |
| 14 Aug 2024, 11:49 | 79.1 | 79.1% |
| 5 Jul 2024, 08:08 | 66.7 | 66.7% |
| 3 Jun 2024, 07:30 | 61.5 | 61.5% |
| 15 Mar 2024, 07:32 | 71.9 | 71.9% |
| 9 Feb 2024, 07:53 | 77.8 | 77.8% |
| 24 Jan 2024, 08:44 | 86.6 | 86.6% |
| 4 Dec 2023, 08:43 | 77.3 | 77.3% |
| 3 Nov 2023, 13:45 | 73.2 | 73.2% |
| 2 Oct 2023, 08:10 | 66.9 | 66.9% |
Dissolved oxygen
as O2 · code 9924 · mg/l
7.04 mg/l
Sampled 11 Aug 2026, 51 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 Aug 2026, 07:30 | 7.04 | 7.04 mg/l |
| 7 May 2026, 11:12 | 8.22 | 8.22 mg/l |
| 4 Feb 2026, 14:13 | 8.33 | 8.33 mg/l |
| 2 Dec 2025, 08:10 | 9 | 9 mg/l |
| 5 Nov 2025, 08:55 | 7.57 | 7.57 mg/l |
| 13 Oct 2025, 15:57 | 7.64 | 7.64 mg/l |
| 4 Sep 2025, 14:16 | 6.8 | 6.8 mg/l |
| 4 Aug 2025, 16:20 | 7.9 | 7.9 mg/l |
| 4 Jul 2025, 07:34 | 6.84 | 6.84 mg/l |
| 4 Jun 2025, 09:13 | 6.54 | 6.54 mg/l |
| 14 May 2025, 07:31 | 7.42 | 7.42 mg/l |
| 23 Apr 2025, 12:14 | 8.4 | 8.4 mg/l |
| 4 Mar 2025, 11:11 | 9.13 | 9.13 mg/l |
| 5 Feb 2025, 07:37 | 9.1 | 9.1 mg/l |
| 13 Jan 2025, 07:45 | 9.55 | 9.55 mg/l |
| 6 Dec 2024, 08:34 | 9.59 | 9.59 mg/l |
| 4 Nov 2024, 07:30 | 8.18 | 8.18 mg/l |
| 2 Oct 2024, 08:10 | 7.02 | 7.02 mg/l |
| 6 Sep 2024, 07:29 | 6.81 | 6.81 mg/l |
| 14 Aug 2024, 11:49 | 7.17 | 7.17 mg/l |
| 5 Jul 2024, 08:08 | 6.46 | 6.46 mg/l |
| 3 Jun 2024, 07:30 | 6.08 | 6.08 mg/l |
| 15 Mar 2024, 07:32 | 7.52 | 7.52 mg/l |
| 9 Feb 2024, 07:53 | 9.12 | 9.12 mg/l |
| 24 Jan 2024, 08:44 | 8.88 | 8.88 mg/l |
| 4 Dec 2023, 08:43 | 9.07 | 9.07 mg/l |
| 3 Nov 2023, 13:45 | 7.5 | 7.5 mg/l |
| 2 Oct 2023, 08:10 | 6.44 | 6.44 mg/l |
Water temperature
code 0076 · °C
18.8 °C
Sampled 11 Aug 2026, 51 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 Aug 2026, 07:30 | 18.8 | 18.8 °C |
| 7 May 2026, 11:12 | 14.9 | 14.9 °C |
| 4 Feb 2026, 14:13 | 9.5 | 9.5 °C |
| 2 Dec 2025, 08:10 | 11.3 | 11.3 °C |
| 5 Nov 2025, 08:55 | 15.7 | 15.7 °C |
| 13 Oct 2025, 15:57 | 16.2 | 16.2 °C |
| 4 Sep 2025, 14:16 | 18.5 | 18.5 °C |
| 4 Aug 2025, 16:20 | 20.7 | 20.7 °C |
| 4 Jul 2025, 07:34 | 20.2 | 20.2 °C |
| 4 Jun 2025, 09:13 | 16.3 | 16.3 °C |
| 14 May 2025, 07:31 | 17.4 | 17.4 °C |
| 23 Apr 2025, 12:14 | 15.9 | 15.9 °C |
| 4 Mar 2025, 11:11 | 13.7 | 13.7 °C |
| 5 Feb 2025, 07:37 | 12.2 | 12.2 °C |
| 13 Jan 2025, 07:45 | 8.6 | 8.6 °C |
| 6 Dec 2024, 08:34 | 11.4 | 11.4 °C |
| 4 Nov 2024, 07:30 | 14.8 | 14.8 °C |
| 2 Oct 2024, 08:10 | 14.7 | 14.7 °C |
| 6 Sep 2024, 07:29 | 18.2 | 18.2 °C |
| 14 Aug 2024, 11:49 | 20 | 20 °C |
| 5 Jul 2024, 08:08 | 16.8 | 16.8 °C |
| 3 Jun 2024, 07:30 | 15.8 | 15.8 °C |
| 15 Mar 2024, 07:32 | 13.2 | 13.2 °C |
| 9 Feb 2024, 07:53 | 8.3 | 8.3 °C |
| 24 Jan 2024, 08:44 | 14.1 | 14.1 °C |
| 4 Dec 2023, 08:43 | 8.3 | 8.3 °C |
| 3 Nov 2023, 13:45 | 14.1 | 14.1 °C |
| 2 Oct 2023, 08:10 | 17.1 | 17.1 °C |
pH
code 0061
7.53
Sampled 11 Aug 2026, 51 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 Aug 2026, 07:30 | 7.53 | 7.53 |
| 7 May 2026, 11:12 | 7.44 | 7.44 |
| 4 Feb 2026, 14:13 | 7.59 | 7.59 |
| 2 Dec 2025, 08:10 | 7.61 | 7.61 |
| 5 Nov 2025, 08:55 | 7.15 | 7.15 |
| 13 Oct 2025, 15:57 | 7.28 | 7.28 |
| 4 Sep 2025, 14:16 | 7.35 | 7.35 |
| 4 Aug 2025, 16:20 | 7.95 | 7.95 |
| 4 Jul 2025, 07:34 | 7.45 | 7.45 |
| 4 Jun 2025, 09:13 | 7.67 | 7.67 |
| 14 May 2025, 07:31 | 7.55 | 7.55 |
| 23 Apr 2025, 12:14 | 7.49 | 7.49 |
| 4 Mar 2025, 11:11 | 7.61 | 7.61 |
| 5 Feb 2025, 07:37 | 7.65 | 7.65 |
| 13 Jan 2025, 07:45 | 7.76 | 7.76 |
| 6 Dec 2024, 08:34 | 7.62 | 7.62 |
| 4 Nov 2024, 07:30 | 7.75 | 7.75 |
| 2 Oct 2024, 08:10 | 7.68 | 7.68 |
| 6 Sep 2024, 07:29 | 7.53 | 7.53 |
| 14 Aug 2024, 11:49 | 7.5 | 7.5 |
| 5 Jul 2024, 08:08 | 7.64 | 7.64 |
| 3 Jun 2024, 07:30 | 7.44 | 7.44 |
| 15 Mar 2024, 07:32 | 7.65 | 7.65 |
| 9 Feb 2024, 07:53 | 7.53 | 7.53 |
| 24 Jan 2024, 08:44 | 8.05 | 8.05 |
| 4 Dec 2023, 08:43 | 7.76 | 7.76 |
| 3 Nov 2023, 13:45 | 7.71 | 7.71 |
| 2 Oct 2023, 08:10 | 7.54 | 7.54 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.091 mg/l
Sampled 11 Aug 2026, 51 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 Aug 2026, 07:30 | 0.091 | 0.091 mg/l |
| 7 May 2026, 11:12 | 0.52 | 0.52 mg/l |
| 4 Feb 2026, 14:13 | 2 | 2 mg/l |
| 2 Dec 2025, 08:10 | 0.091 | 0.091 mg/l |
| 5 Nov 2025, 08:55 | 1.3 | 1.3 mg/l |
| 13 Oct 2025, 15:57 | 0.24 | 0.24 mg/l |
| 4 Sep 2025, 14:16 | 0.45 | 0.45 mg/l |
| 4 Aug 2025, 16:20 | 0.26 | 0.26 mg/l |
| 4 Jul 2025, 07:34 | 0.088 | 0.088 mg/l |
| 4 Jun 2025, 09:13 | 2.7 | 2.7 mg/l |
| 14 May 2025, 07:31 | 0.1 | 0.1 mg/l |
| 23 Apr 2025, 12:14 | 0.25 | 0.25 mg/l |
| 4 Mar 2025, 11:11 | 1.8 | 1.8 mg/l |
| 5 Feb 2025, 07:37 | 0.47 | 0.47 mg/l |
| 13 Jan 2025, 07:45 | 0.9 | 0.9 mg/l |
| 4 Nov 2024, 07:30 | 0.07 | 0.07 mg/l |
| 2 Oct 2024, 08:10 | 0.96 | 0.96 mg/l |
| 6 Sep 2024, 07:29 | 0.1 | 0.1 mg/l |
| 14 Aug 2024, 11:49 | 0.29 | 0.29 mg/l |
| 5 Jul 2024, 08:08 | 0.35 | 0.35 mg/l |
| 3 Jun 2024, 07:30 | 0.38 | 0.38 mg/l |
| 15 Mar 2024, 07:32 | 1 | 1 mg/l |
| 9 Feb 2024, 07:53 | 1.4 | 1.4 mg/l |
| 24 Jan 2024, 08:44 | 3 | 3 mg/l |
| 4 Dec 2023, 08:43 | 3.5 | 3.5 mg/l |
| 3 Nov 2023, 13:45 | 0.2 | 0.2 mg/l |
| 2 Oct 2023, 08:10 | 0.21 | 0.21 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
16.9 mg/l
Sampled 11 Aug 2026, 51 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 Aug 2026, 07:30 | 16.9 | 16.9 mg/l |
| 7 May 2026, 11:12 | 17.9 | 17.9 mg/l |
| 4 Feb 2026, 14:13 | 11.4 | 11.4 mg/l |
| 2 Dec 2025, 08:10 | 9.37 | 9.37 mg/l |
| 5 Nov 2025, 08:55 | 16.5 | 16.5 mg/l |
| 13 Oct 2025, 15:57 | 16.8 | 16.8 mg/l |
| 4 Sep 2025, 14:16 | 7.91 | 7.91 mg/l |
| 4 Aug 2025, 16:20 | 9.9 | 9.9 mg/l |
| 4 Jul 2025, 07:34 | 16.9 | 16.9 mg/l |
| 4 Jun 2025, 09:13 | 10.6 | 10.6 mg/l |
| 14 May 2025, 07:31 | 13.9 | 13.9 mg/l |
| 23 Apr 2025, 12:14 | 10.8 | 10.8 mg/l |
| 4 Mar 2025, 11:11 | 16.8 | 16.8 mg/l |
| 5 Feb 2025, 07:37 | 14.6 | 14.6 mg/l |
| 13 Jan 2025, 07:45 | 8.9 | 8.9 mg/l |
| 4 Nov 2024, 07:30 | 15.9 | 15.9 mg/l |
| 2 Oct 2024, 08:10 | 7.85 | 7.85 mg/l |
| 6 Sep 2024, 07:29 | 14.9 | 14.9 mg/l |
| 14 Aug 2024, 11:49 | 12.8 | 12.8 mg/l |
| 5 Jul 2024, 08:08 | 12.9 | 12.9 mg/l |
| 3 Jun 2024, 07:30 | 17.9 | 17.9 mg/l |
| 15 Mar 2024, 07:32 | 10.6 | 10.6 mg/l |
| 9 Feb 2024, 07:53 | 5.85 | 5.85 mg/l |
| 24 Jan 2024, 08:44 | 7.88 | 7.88 mg/l |
| 4 Dec 2023, 08:43 | 5.02 | 5.02 mg/l |
| 3 Nov 2023, 13:45 | 9.81 | 9.81 mg/l |
| 2 Oct 2023, 08:10 | 9.31 | 9.31 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.11 mg/l
Sampled 7 May 2026, 5 months ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 7 May 2026, 11:12 | 0.11 | 0.11 mg/l |
| 4 Feb 2026, 14:13 | 0.14 | 0.14 mg/l |
| 2 Dec 2025, 08:10 | 0.081 | 0.081 mg/l |
| 5 Nov 2025, 08:55 | 0.07 | 0.07 mg/l |
| 13 Oct 2025, 15:57 | 0.13 | 0.13 mg/l |
| 4 Sep 2025, 14:16 | 0.15 | 0.15 mg/l |
| 4 Aug 2025, 16:20 | 0.28 | 0.28 mg/l |
| 4 Jul 2025, 07:34 | 0.26 | 0.26 mg/l |
| 4 Jun 2025, 09:13 | 3.4 | 3.4 mg/l |
| 14 May 2025, 07:31 | 0.23 | 0.23 mg/l |
| 23 Apr 2025, 12:14 | 0.15 | 0.15 mg/l |
| 4 Mar 2025, 11:11 | 0.12 | 0.12 mg/l |
| 5 Feb 2025, 07:37 | 0.13 | 0.13 mg/l |
| 13 Jan 2025, 07:45 | 1.1 | 1.1 mg/l |
| 4 Nov 2024, 07:30 | 0.46 | 0.46 mg/l |
| 2 Oct 2024, 08:10 | 0.23 | 0.23 mg/l |
| 6 Sep 2024, 07:29 | 1.7 | 1.7 mg/l |
| 14 Aug 2024, 11:49 | 1.8 | 1.8 mg/l |
| 5 Jul 2024, 08:08 | 1.1 | 1.1 mg/l |
| 3 Jun 2024, 07:30 | 0.25 | 0.25 mg/l |
| 15 Mar 2024, 07:32 | 0.66 | 0.66 mg/l |
| 9 Feb 2024, 07:53 | 0.28 | 0.28 mg/l |
| 24 Jan 2024, 08:44 | 0.2 | 0.2 mg/l |
| 4 Dec 2023, 08:43 | 0.62 | 0.62 mg/l |
| 3 Nov 2023, 13:45 | 0.098 | 0.098 mg/l |
| 2 Oct 2023, 08:10 | 0.24 | 0.24 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
1115 µS/cm
Sampled 11 Aug 2026, 51 days ago · 11 results banked
Every result (11)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 Aug 2026, 07:30 | 1115 | 1115 µS/cm |
| 7 May 2026, 11:12 | 1156 | 1156 µS/cm |
| 4 Feb 2026, 14:13 | 924 | 924 µS/cm |
| 5 Nov 2025, 08:55 | 962 | 962 µS/cm |
| 4 Aug 2025, 16:20 | 1150 | 1150 µS/cm |
| 14 May 2025, 07:31 | 1198 | 1198 µS/cm |
| 5 Feb 2025, 07:37 | 1242 | 1242 µS/cm |
| 4 Nov 2024, 07:30 | 1000 | 1000 µS/cm |
| 14 Aug 2024, 11:49 | 1096 | 1096 µS/cm |
| 9 Feb 2024, 07:53 | 747 | 747 µS/cm |
| 3 Nov 2023, 13:45 | 960 | 960 µS/cm |
Everything measured here
24 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 24 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 28 | Oct 2023 – Aug 2026 | 75.8% 11 Aug 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 28 | Oct 2023 – Aug 2026 | 7.04 mg/l 11 Aug 2026 |
| Temperature of Water 0076 | River water | 28 | Oct 2023 – Aug 2026 | 18.8 °C 11 Aug 2026 |
| pH 0061 | River water | 28 | Oct 2023 – Aug 2026 | 7.53 11 Aug 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 27 | Oct 2023 – Aug 2026 | 0.091 mg/l 11 Aug 2026 |
| Nitrate as N 0117 | River water | 27 | Oct 2023 – Aug 2026 | 16.9 mg/l 11 Aug 2026 |
| Orthophosphate, reactive as P 0180 | River water | 26 | Oct 2023 – May 2026 | 0.11 mg/l 7 May 2026 |
| Conductivity at 25 C 0077 | River water | 11 | Nov 2023 – Aug 2026 | 1115 µS/cm 11 Aug 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 27 | Oct 2023 – Aug 2026 | 96 mg/l 11 Aug 2026 |
| Ammonia un-ionised as N 0119 | River water | 27 | Oct 2023 – Aug 2026 | 0.00109 mg/l 11 Aug 2026 |
| BOD : 5 Day ATU 0085 | River water | 23 | Oct 2023 – Dec 2025 | 4.3 mg/l 2 Dec 2025 |
| Calcium 0241 | River water | 11 | Nov 2023 – Aug 2026 | 110 mg/l 11 Aug 2026 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 11 | Nov 2023 – Aug 2026 | 5 mg/l 11 Aug 2026 |
| Chloride 0172 | River water | 11 | Nov 2023 – Aug 2026 | 95 mg/l 11 Aug 2026 |
| Magnesium 0237 | River water | 11 | Nov 2023 – Aug 2026 | 24 mg/l 11 Aug 2026 |
| Nitrite as N 0118 | River water | 27 | Oct 2023 – Aug 2026 | 0.066 mg/l 11 Aug 2026 |
| Nitrogen, Kjeldahl as N 0114 | River water | 11 | Nov 2023 – Aug 2026 | 5 mg/l 11 Aug 2026 |
| Nitrogen, Total as N 9686 | River water | 11 | Nov 2023 – Aug 2026 | 22 mg/l 11 Aug 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 27 | Oct 2023 – Aug 2026 | 17 mg/l 11 Aug 2026 |
| Potassium 0211 | River water | 11 | Nov 2023 – Aug 2026 | 15 mg/l 11 Aug 2026 |
| Sodium 0207 | River water | 11 | Nov 2023 – Aug 2026 | 62 mg/l 11 Aug 2026 |
| Solids, Suspended at 105 C 0135 | River water | 24 | Oct 2023 – Dec 2025 | 15 mg/l 2 Dec 2025 |
| Sulphate as SO4 0183 | River water | 11 | Nov 2023 – Aug 2026 | 240 mg/l 11 Aug 2026 |
| Visible oil or grease, significant trace: Present/Not found (1/0) 0664 | River water | 12 | Nov 2023 – Aug 2026 | Not found 11 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.