Piddle Brook Seaford

EA name: PIDDLE BROOK SEAFORD
Environment Agency sampling point MD-06611280 · 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
15 May 2026, 13:355 months ago · time as the Environment Agency records it (UK clock time; the source gives no time zone). Not sampled since, as far as the archive shows: the Environment Agency was asked up to 30 Sep 2026 and had nothing newer.
Samples banked
22 since 2 Jul 2024 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 395920, 251290As published, to the nearest 10 m. Open in a map
River, by its own name
Piddle Brook
River, by the map
Piddle BrookPlaced on the river its name gives, 3 m from the line.
Next gauge downstream
Wyre Piddle On the Piddle Brook · 4.8 km along the river
Why it was sampled
Monitoring (national agency policy) (13 samples)
Environmental monitoring statutory (EU directives) (9 samples)

Main measurements, river water

Dissolved oxygen

% saturation · code 9901 · %

101.5%

Sampled 15 May 2026, 5 months ago · 22 results banked

6080100120140%2024202520262 Jul 2024, 13:07: 86.6%9 Aug 2024, 11:43: 90.2%10 Sep 2024, 12:30: 77.9%9 Oct 2024, 11:31: 78.7%5 Nov 2024, 10:13: 82.2%3 Dec 2024, 10:51: 89.2%14 Jan 2025, 11:20: 96.7%4 Feb 2025, 11:11: 91.9%6 Mar 2025, 13:17: 100.6%21 May 2025, 11:31: 93.4%25 Jun 2025, 13:12: 97.6%21 Jul 2025, 14:10: 94.5%12 Aug 2025, 08:43: 79.9%10 Sep 2025, 13:01: 85.4%21 Oct 2025, 12:59: 85.3%11 Nov 2025, 12:05: 79.2%5 Dec 2025, 10:44: 91.6%21 Jan 2026, 14:26: 95.7%4 Feb 2026, 09:53: 93%17 Mar 2026, 11:05: 95.6%15 Apr 2026, 14:34: 120.6%15 May 2026, 13:35: 101.5%
Every result (22)
SampledResult as publishedReads as
15 May 2026, 13:35101.5 101.5%
15 Apr 2026, 14:34120.6 120.6%
17 Mar 2026, 11:0595.6 95.6%
4 Feb 2026, 09:5393 93%
21 Jan 2026, 14:2695.7 95.7%
5 Dec 2025, 10:4491.6 91.6%
11 Nov 2025, 12:0579.2 79.2%
21 Oct 2025, 12:5985.3 85.3%
10 Sep 2025, 13:0185.4 85.4%
12 Aug 2025, 08:4379.9 79.9%
21 Jul 2025, 14:1094.5 94.5%
25 Jun 2025, 13:1297.6 97.6%
21 May 2025, 11:3193.4 93.4%
6 Mar 2025, 13:17100.6 100.6%
4 Feb 2025, 11:1191.9 91.9%
14 Jan 2025, 11:2096.7 96.7%
3 Dec 2024, 10:5189.2 89.2%
5 Nov 2024, 10:1382.2 82.2%
9 Oct 2024, 11:3178.7 78.7%
10 Sep 2024, 12:3077.9 77.9%
9 Aug 2024, 11:4390.2 90.2%
2 Jul 2024, 13:0786.6 86.6%

Dissolved oxygen

as O2 · code 9924 · mg/l

11.2 mg/l

Sampled 15 May 2026, 5 months ago · 22 results banked

68101214mg/l2024202520262 Jul 2024, 13:07: 8.81 mg/l9 Aug 2024, 11:43: 8.57 mg/l10 Sep 2024, 12:30: 7.94 mg/l9 Oct 2024, 11:31: 8.27 mg/l5 Nov 2024, 10:13: 8.96 mg/l3 Dec 2024, 10:51: 10.5 mg/l14 Jan 2025, 11:20: 12.2 mg/l4 Feb 2025, 11:11: 11.1 mg/l6 Mar 2025, 13:17: 11.9 mg/l21 May 2025, 11:31: 9.62 mg/l25 Jun 2025, 13:12: 8.77 mg/l21 Jul 2025, 14:10: 8.81 mg/l12 Aug 2025, 08:43: 7.65 mg/l10 Sep 2025, 13:01: 8.57 mg/l21 Oct 2025, 12:59: 8.95 mg/l11 Nov 2025, 12:05: 8.65 mg/l5 Dec 2025, 10:44: 11.3 mg/l21 Jan 2026, 14:26: 11.5 mg/l4 Feb 2026, 09:53: 11.7 mg/l17 Mar 2026, 11:05: 11 mg/l15 Apr 2026, 14:34: 13.1 mg/l15 May 2026, 13:35: 11.2 mg/l
Every result (22)
SampledResult as publishedReads as
15 May 2026, 13:3511.2 11.2 mg/l
15 Apr 2026, 14:3413.1 13.1 mg/l
17 Mar 2026, 11:0511 11 mg/l
4 Feb 2026, 09:5311.7 11.7 mg/l
21 Jan 2026, 14:2611.5 11.5 mg/l
5 Dec 2025, 10:4411.3 11.3 mg/l
11 Nov 2025, 12:058.65 8.65 mg/l
21 Oct 2025, 12:598.95 8.95 mg/l
10 Sep 2025, 13:018.57 8.57 mg/l
12 Aug 2025, 08:437.65 7.65 mg/l
21 Jul 2025, 14:108.81 8.81 mg/l
25 Jun 2025, 13:128.77 8.77 mg/l
21 May 2025, 11:319.62 9.62 mg/l
6 Mar 2025, 13:1711.9 11.9 mg/l
4 Feb 2025, 11:1111.1 11.1 mg/l
14 Jan 2025, 11:2012.2 12.2 mg/l
3 Dec 2024, 10:5110.5 10.5 mg/l
5 Nov 2024, 10:138.96 8.96 mg/l
9 Oct 2024, 11:318.27 8.27 mg/l
10 Sep 2024, 12:307.94 7.94 mg/l
9 Aug 2024, 11:438.57 8.57 mg/l
2 Jul 2024, 13:078.81 8.81 mg/l

Water temperature

code 0076 · °C

10.8 °C

Sampled 15 May 2026, 5 months ago · 22 results banked

510152025°C2024202520262 Jul 2024, 13:07: 14.5 °C9 Aug 2024, 11:43: 17.7 °C10 Sep 2024, 12:30: 14.4 °C9 Oct 2024, 11:31: 13 °C5 Nov 2024, 10:13: 11.4 °C3 Dec 2024, 10:51: 8.1 °C14 Jan 2025, 11:20: 5.4 °C4 Feb 2025, 11:11: 7 °C6 Mar 2025, 13:17: 8.1 °C21 May 2025, 11:31: 13.9 °C25 Jun 2025, 13:12: 20.5 °C21 Jul 2025, 14:10: 18.6 °C12 Aug 2025, 08:43: 17.3 °C10 Sep 2025, 13:01: 15.1 °C21 Oct 2025, 12:59: 13.1 °C11 Nov 2025, 12:05: 11.3 °C5 Dec 2025, 10:44: 6.2 °C21 Jan 2026, 14:26: 7.2 °C4 Feb 2026, 09:53: 5.4 °C17 Mar 2026, 11:05: 9.3 °C15 Apr 2026, 14:34: 11.5 °C15 May 2026, 13:35: 10.8 °C
Every result (22)
SampledResult as publishedReads as
15 May 2026, 13:3510.8 10.8 °C
15 Apr 2026, 14:3411.5 11.5 °C
17 Mar 2026, 11:059.3 9.3 °C
4 Feb 2026, 09:535.4 5.4 °C
21 Jan 2026, 14:267.2 7.2 °C
5 Dec 2025, 10:446.2 6.2 °C
11 Nov 2025, 12:0511.3 11.3 °C
21 Oct 2025, 12:5913.1 13.1 °C
10 Sep 2025, 13:0115.1 15.1 °C
12 Aug 2025, 08:4317.3 17.3 °C
21 Jul 2025, 14:1018.6 18.6 °C
25 Jun 2025, 13:1220.5 20.5 °C
21 May 2025, 11:3113.9 13.9 °C
6 Mar 2025, 13:178.1 8.1 °C
4 Feb 2025, 11:117 7 °C
14 Jan 2025, 11:205.4 5.4 °C
3 Dec 2024, 10:518.1 8.1 °C
5 Nov 2024, 10:1311.4 11.4 °C
9 Oct 2024, 11:3113 13 °C
10 Sep 2024, 12:3014.4 14.4 °C
9 Aug 2024, 11:4317.7 17.7 °C
2 Jul 2024, 13:0714.5 14.5 °C

pH

code 0061

8.35

Sampled 15 May 2026, 5 months ago · 22 results banked

7.67.888.28.48.62024202520262 Jul 2024, 13:07: 8.39 Aug 2024, 11:43: 8.1210 Sep 2024, 12:30: 8.019 Oct 2024, 11:31: 7.685 Nov 2024, 10:13: 7.933 Dec 2024, 10:51: 8.0514 Jan 2025, 11:20: 8.234 Feb 2025, 11:11: 8.126 Mar 2025, 13:17: 8.2921 May 2025, 11:31: 8.0925 Jun 2025, 13:12: 8.1121 Jul 2025, 14:10: 8.1912 Aug 2025, 08:43: 7.9210 Sep 2025, 13:01: 7.9121 Oct 2025, 12:59: 7.9111 Nov 2025, 12:05: 7.85 Dec 2025, 10:44: 7.8921 Jan 2026, 14:26: 8.154 Feb 2026, 09:53: 7.9417 Mar 2026, 11:05: 8.0715 Apr 2026, 14:34: 8.4615 May 2026, 13:35: 8.35
Every result (22)
SampledResult as publishedReads as
15 May 2026, 13:358.35 8.35
15 Apr 2026, 14:348.46 8.46
17 Mar 2026, 11:058.07 8.07
4 Feb 2026, 09:537.94 7.94
21 Jan 2026, 14:268.15 8.15
5 Dec 2025, 10:447.89 7.89
11 Nov 2025, 12:057.8 7.8
21 Oct 2025, 12:597.91 7.91
10 Sep 2025, 13:017.91 7.91
12 Aug 2025, 08:437.92 7.92
21 Jul 2025, 14:108.19 8.19
25 Jun 2025, 13:128.11 8.11
21 May 2025, 11:318.09 8.09
6 Mar 2025, 13:178.29 8.29
4 Feb 2025, 11:118.12 8.12
14 Jan 2025, 11:208.23 8.23
3 Dec 2024, 10:518.05 8.05
5 Nov 2024, 10:137.93 7.93
9 Oct 2024, 11:317.68 7.68
10 Sep 2024, 12:308.01 8.01
9 Aug 2024, 11:438.12 8.12
2 Jul 2024, 13:078.3 8.3

Ammonia

ammoniacal nitrogen as N · code 0111 · mg/l

below 0.03 mg/l (not detected above this)

Sampled 15 May 2026, 5 months ago · 22 results banked

0.030.040.05mg/l2024202520262 Jul 2024, 13:07: below 0.03 mg/l (not detected above this)9 Aug 2024, 11:43: below 0.03 mg/l (not detected above this)10 Sep 2024, 12:30: below 0.03 mg/l (not detected above this)9 Oct 2024, 11:31: below 0.03 mg/l (not detected above this)5 Nov 2024, 10:13: below 0.03 mg/l (not detected above this)3 Dec 2024, 10:51: below 0.03 mg/l (not detected above this)14 Jan 2025, 11:20: 0.05 mg/l4 Feb 2025, 11:11: 0.034 mg/l6 Mar 2025, 13:17: 0.034 mg/l21 May 2025, 11:31: below 0.03 mg/l (not detected above this)25 Jun 2025, 13:12: below 0.03 mg/l (not detected above this)21 Jul 2025, 14:10: below 0.03 mg/l (not detected above this)12 Aug 2025, 08:43: below 0.03 mg/l (not detected above this)10 Sep 2025, 13:01: below 0.03 mg/l (not detected above this)21 Oct 2025, 12:59: below 0.03 mg/l (not detected above this)11 Nov 2025, 12:05: below 0.03 mg/l (not detected above this)5 Dec 2025, 10:44: below 0.03 mg/l (not detected above this)21 Jan 2026, 14:26: below 0.03 mg/l (not detected above this)4 Feb 2026, 09:53: below 0.03 mg/l (not detected above this)17 Mar 2026, 11:05: below 0.03 mg/l (not detected above this)15 Apr 2026, 14:34: below 0.03 mg/l (not detected above this)15 May 2026, 13:35: below 0.03 mg/l (not detected above this)
Every result (22)
SampledResult as publishedReads as
15 May 2026, 13:35<0.03 below 0.03 mg/l (not detected above this)
15 Apr 2026, 14:34<0.03 below 0.03 mg/l (not detected above this)
17 Mar 2026, 11:05<0.03 below 0.03 mg/l (not detected above this)
4 Feb 2026, 09:53<0.03 below 0.03 mg/l (not detected above this)
21 Jan 2026, 14:26<0.03 below 0.03 mg/l (not detected above this)
5 Dec 2025, 10:44<0.03 below 0.03 mg/l (not detected above this)
11 Nov 2025, 12:05<0.03 below 0.03 mg/l (not detected above this)
21 Oct 2025, 12:59<0.03 below 0.03 mg/l (not detected above this)
10 Sep 2025, 13:01<0.03 below 0.03 mg/l (not detected above this)
12 Aug 2025, 08:43<0.03 below 0.03 mg/l (not detected above this)
21 Jul 2025, 14:10<0.03 below 0.03 mg/l (not detected above this)
25 Jun 2025, 13:12<0.03 below 0.03 mg/l (not detected above this)
21 May 2025, 11:31<0.03 below 0.03 mg/l (not detected above this)
6 Mar 2025, 13:170.034 0.034 mg/l
4 Feb 2025, 11:110.034 0.034 mg/l
14 Jan 2025, 11:200.05 0.05 mg/l
3 Dec 2024, 10:51<0.03 below 0.03 mg/l (not detected above this)
5 Nov 2024, 10:13<0.03 below 0.03 mg/l (not detected above this)
9 Oct 2024, 11:31<0.03 below 0.03 mg/l (not detected above this)
10 Sep 2024, 12:30<0.03 below 0.03 mg/l (not detected above this)
9 Aug 2024, 11:43<0.03 below 0.03 mg/l (not detected above this)
2 Jul 2024, 13:07<0.03 below 0.03 mg/l (not detected above this)

Nitrate

as nitrogen (N) · code 0117 · mg/l

6.38 mg/l

Sampled 15 May 2026, 5 months ago · 22 results banked

2.557.51012.5mg/l2024202520262 Jul 2024, 13:07: 7.29 mg/l9 Aug 2024, 11:43: 6.89 mg/l10 Sep 2024, 12:30: 5.79 mg/l9 Oct 2024, 11:31: 8.88 mg/l5 Nov 2024, 10:13: 4.99 mg/l3 Dec 2024, 10:51: 4.59 mg/l14 Jan 2025, 11:20: 5.38 mg/l4 Feb 2025, 11:11: 4.79 mg/l6 Mar 2025, 13:17: 5.49 mg/l21 May 2025, 11:31: 6.47 mg/l25 Jun 2025, 13:12: 5.48 mg/l21 Jul 2025, 14:10: 5.29 mg/l12 Aug 2025, 08:43: 5.08 mg/l10 Sep 2025, 13:01: 4.39 mg/l21 Oct 2025, 12:59: 5.69 mg/l11 Nov 2025, 12:05: 3.68 mg/l5 Dec 2025, 10:44: 11 mg/l21 Jan 2026, 14:26: 4.29 mg/l4 Feb 2026, 09:53: 2.59 mg/l17 Mar 2026, 11:05: 3.69 mg/l15 Apr 2026, 14:34: 5.98 mg/l15 May 2026, 13:35: 6.38 mg/l
Every result (22)
SampledResult as publishedReads as
15 May 2026, 13:356.38 6.38 mg/l
15 Apr 2026, 14:345.98 5.98 mg/l
17 Mar 2026, 11:053.69 3.69 mg/l
4 Feb 2026, 09:532.59 2.59 mg/l
21 Jan 2026, 14:264.29 4.29 mg/l
5 Dec 2025, 10:4411 11 mg/l
11 Nov 2025, 12:053.68 3.68 mg/l
21 Oct 2025, 12:595.69 5.69 mg/l
10 Sep 2025, 13:014.39 4.39 mg/l
12 Aug 2025, 08:435.08 5.08 mg/l
21 Jul 2025, 14:105.29 5.29 mg/l
25 Jun 2025, 13:125.48 5.48 mg/l
21 May 2025, 11:316.47 6.47 mg/l
6 Mar 2025, 13:175.49 5.49 mg/l
4 Feb 2025, 11:114.79 4.79 mg/l
14 Jan 2025, 11:205.38 5.38 mg/l
3 Dec 2024, 10:514.59 4.59 mg/l
5 Nov 2024, 10:134.99 4.99 mg/l
9 Oct 2024, 11:318.88 8.88 mg/l
10 Sep 2024, 12:305.79 5.79 mg/l
9 Aug 2024, 11:436.89 6.89 mg/l
2 Jul 2024, 13:077.29 7.29 mg/l

Phosphate

orthophosphate, reactive, as P · code 0180 · mg/l

0.28 mg/l

Sampled 15 May 2026, 5 months ago · 22 results banked

00.20.40.60.8mg/l2024202520262 Jul 2024, 13:07: 0.37 mg/l9 Aug 2024, 11:43: 0.36 mg/l10 Sep 2024, 12:30: 0.42 mg/l9 Oct 2024, 11:31: 0.22 mg/l5 Nov 2024, 10:13: 0.32 mg/l3 Dec 2024, 10:51: 0.16 mg/l14 Jan 2025, 11:20: 0.17 mg/l4 Feb 2025, 11:11: 0.17 mg/l6 Mar 2025, 13:17: 0.19 mg/l21 May 2025, 11:31: 0.47 mg/l25 Jun 2025, 13:12: 0.68 mg/l21 Jul 2025, 14:10: 0.74 mg/l12 Aug 2025, 08:43: 0.65 mg/l10 Sep 2025, 13:01: 0.66 mg/l21 Oct 2025, 12:59: 0.59 mg/l11 Nov 2025, 12:05: 0.56 mg/l5 Dec 2025, 10:44: 0.17 mg/l21 Jan 2026, 14:26: 0.14 mg/l4 Feb 2026, 09:53: 0.15 mg/l17 Mar 2026, 11:05: 0.17 mg/l15 Apr 2026, 14:34: 0.16 mg/l15 May 2026, 13:35: 0.28 mg/l
Every result (22)
SampledResult as publishedReads as
15 May 2026, 13:350.28 0.28 mg/l
15 Apr 2026, 14:340.16 0.16 mg/l
17 Mar 2026, 11:050.17 0.17 mg/l
4 Feb 2026, 09:530.15 0.15 mg/l
21 Jan 2026, 14:260.14 0.14 mg/l
5 Dec 2025, 10:440.17 0.17 mg/l
11 Nov 2025, 12:050.56 0.56 mg/l
21 Oct 2025, 12:590.59 0.59 mg/l
10 Sep 2025, 13:010.66 0.66 mg/l
12 Aug 2025, 08:430.65 0.65 mg/l
21 Jul 2025, 14:100.74 0.74 mg/l
25 Jun 2025, 13:120.68 0.68 mg/l
21 May 2025, 11:310.47 0.47 mg/l
6 Mar 2025, 13:170.19 0.19 mg/l
4 Feb 2025, 11:110.17 0.17 mg/l
14 Jan 2025, 11:200.17 0.17 mg/l
3 Dec 2024, 10:510.16 0.16 mg/l
5 Nov 2024, 10:130.32 0.32 mg/l
9 Oct 2024, 11:310.22 0.22 mg/l
10 Sep 2024, 12:300.42 0.42 mg/l
9 Aug 2024, 11:430.36 0.36 mg/l
2 Jul 2024, 13:070.37 0.37 mg/l

Conductivity

at 25 °C · code 0077 · µS/cm

1403 µS/cm

Sampled 15 May 2026, 5 months ago · 22 results banked

0500100015002000µS/cm2024202520262 Jul 2024, 13:07: 1449 µS/cm9 Aug 2024, 11:43: 1523 µS/cm10 Sep 2024, 12:30: 1406 µS/cm9 Oct 2024, 11:31: 632 µS/cm5 Nov 2024, 10:13: 1181 µS/cm3 Dec 2024, 10:51: 737 µS/cm14 Jan 2025, 11:20: 985 µS/cm4 Feb 2025, 11:11: 926 µS/cm6 Mar 2025, 13:17: 1077 µS/cm21 May 2025, 11:31: 1451 µS/cm25 Jun 2025, 13:12: 1498 µS/cm21 Jul 2025, 14:10: 1520 µS/cm12 Aug 2025, 08:43: 1595 µS/cm10 Sep 2025, 13:01: 1438 µS/cm21 Oct 2025, 12:59: 1562 µS/cm11 Nov 2025, 12:05: 1444 µS/cm5 Dec 2025, 10:44: 877 µS/cm21 Jan 2026, 14:26: 545 µS/cm4 Feb 2026, 09:53: 442 µS/cm17 Mar 2026, 11:05: 844 µS/cm15 Apr 2026, 14:34: 1265 µS/cm15 May 2026, 13:35: 1403 µS/cm
Every result (22)
SampledResult as publishedReads as
15 May 2026, 13:351403 1403 µS/cm
15 Apr 2026, 14:341265 1265 µS/cm
17 Mar 2026, 11:05844 844 µS/cm
4 Feb 2026, 09:53442 442 µS/cm
21 Jan 2026, 14:26545 545 µS/cm
5 Dec 2025, 10:44877 877 µS/cm
11 Nov 2025, 12:051444 1444 µS/cm
21 Oct 2025, 12:591562 1562 µS/cm
10 Sep 2025, 13:011438 1438 µS/cm
12 Aug 2025, 08:431595 1595 µS/cm
21 Jul 2025, 14:101520 1520 µS/cm
25 Jun 2025, 13:121498 1498 µS/cm
21 May 2025, 11:311451 1451 µS/cm
6 Mar 2025, 13:171077 1077 µS/cm
4 Feb 2025, 11:11926 926 µS/cm
14 Jan 2025, 11:20985 985 µS/cm
3 Dec 2024, 10:51737 737 µS/cm
5 Nov 2024, 10:131181 1181 µS/cm
9 Oct 2024, 11:31632 632 µS/cm
10 Sep 2024, 12:301406 1406 µS/cm
9 Aug 2024, 11:431523 1523 µS/cm
2 Jul 2024, 13:071449 1449 µS/cm

Everything measured here

13 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 13 rows
DeterminandMaterialResults First – lastLatest result
Oxygen, Dissolved, % Saturation 9901 River water 22 Jul 2024 – May 2026 101.5% 15 May 2026
Oxygen, Dissolved as O2 9924 River water 22 Jul 2024 – May 2026 11.2 mg/l 15 May 2026
Temperature of Water 0076 River water 22 Jul 2024 – May 2026 10.8 °C 15 May 2026
pH 0061 River water 22 Jul 2024 – May 2026 8.35 15 May 2026
Ammoniacal Nitrogen as N 0111 River water 22 Jul 2024 – May 2026 below 0.03 mg/l 15 May 2026
Nitrate as N 0117 River water 22 Jul 2024 – May 2026 6.38 mg/l 15 May 2026
Orthophosphate, reactive as P 0180 River water 22 Jul 2024 – May 2026 0.28 mg/l 15 May 2026
Conductivity at 25 C 0077 River water 22 Jul 2024 – May 2026 1403 µS/cm 15 May 2026
Alkalinity to pH 4.5 as CaCO3 0162 River water 22 Jul 2024 – May 2026 290 mg/l 15 May 2026
Ammonia un-ionised as N 0119 River water 22 Jul 2024 – May 2026 below 0.00058 mg/l 15 May 2026
BOD : 5 Day ATU 0085 River water 20 Sep 2024 – May 2026 1.8 mg/l 15 May 2026
Nitrite as N 0118 River water 22 Jul 2024 – May 2026 0.018 mg/l 15 May 2026
Nitrogen, Total Oxidised as N 0116 River water 22 Jul 2024 – May 2026 6.4 mg/l 15 May 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.