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Compton Castle

SBB00301
Overflow on the network feeding Compton And Marldon STW · Combined sewer overflow
Shellfish water · Teign Estuary
Showing history for 2023 · records go back to 2020
Not spilling

The monitor is reporting and shows no discharge.

Last spill ended
8 Sept, 10:44
Counted spills, 2023
142
311 discharge events
Hours spilled, 2023
2,165
Is the feed working?
Working
Last checked 21 min ago · we poll SWW hourly
48h agonow
48/48 hourly readings received
Dry spills, 2023
19
19 in 2023 · 134 since 2020
How a dry spill is decided →
Spilled before its STW, 2023
281
281 in 2023 · 1424 since 2020
What this means →
Why this one spills

This looks like a fault, not a storm.

This overflow has discharged in dry weather 134 times since 2020 — spills with no rainfall to excuse them. Its treatment works is not itself over capacity, so a catchment-wide explanation does not hold. Applied to this record, the two-stage lawfulness test is hard to pass: a recurring dry-weather discharge is not an exceptional circumstance, and where the remedy is routine maintenance the disproportionate-cost exception is hard to run.

How this verdict is reached →

Can its works cope?

Full capacity view →

This overflow drains to Compton And Marldon STW, serving about 2,303 people.

—
of permitted flow
Not assessed

The works has headroom — so spills here point to another problem, often on that branch of the network (a blockage, a failed pump or infiltration).

Its permit

What the environmental permit sets for this overflow — and where the public record is silent, which is itself the finding.

Pass-forward flow
Not published
Spill frequency limit
None set
Monitoring tier
Not published
Assessment trigger
Crossed — over 10 spills/year

Is anyone acting on this?

Flagged problems
High spill frequency1,659 discharge events since 2020Very long spills645 hours in the last full yearDry spilling134 dry spills since 2020Spills before its works1424 times since 2020
Measures on record
  • Investigation to meet EnvAct INV4 Driver
    Investigationdue 2027
  • Reduction of spills to meet EnvAct_IMP drivers
    Improvementdue 2028
Verdict
Improvement under way

A physical improvement is committed against this overflow.

What you can do about this one

OPEN NOW

Ask for the data

Under the Environmental Information Regulations, Compton Castle's telemetry, the works' flow-to-full-treatment setting, and any spill investigations are emissions information — they cannot be withheld on commercial-confidentiality grounds. A written request is the fastest lever.

BY 30 APR 2027

Get it into the next programme

Investigations that will shape the 2030–35 environment programme must complete by this date. Putting this overflow on the record now — to South West Water and the Environment Agency — is what gets it considered.

BY 1 NOV 2027

Put it in the drainage plan

South West Water's draft Drainage & Wastewater Management Plan goes to a twelve-week consultation. A named overflow with evidence behind it is far harder to leave out.

The record since 2020

134 dry spills and 1424 pre-STW spills since 2020. Pick a year to see its events below.

Count by

2023: 142 spills · 311 discharge events

15320201122021110202214220231442024692025942026

Counted spills — the EA's 12/24-hour block method, the basis of the 10-a-year cap. Published annual return where available, computed the same way for the current year. Two ways to count →

Dry spills, every year

63 dry spills since 2020 · showing up to 12

31 Dec, 05:34
18h 26m
0.1
Not spilling
→
31 Dec, 04:56
28m
0.1
Not spilling
→
31 Dec, 04:22
26m
0.1
Not spilling
→
29 Dec, 12:12
40h 2m
0.1
Not spilling
→
13 Apr, 19:28
12h 2m
0.0
Not spilling
→
13 Apr, 05:30
13h 58m
0.0
Not spilling
→
12 Apr, 19:12
10h 18m
0.0
Not spilling
→
21 Mar, 16:38
28m
0.1
Not spilling
→
7 Mar, 06:24
259h 56m
0.1
Not spilling
→
19 Feb, 23:42
20m
0.2
Not spilling
→
19 Feb, 22:54
18m
0.2
Not spilling
→
19 Feb, 21:48
1h 6m
0.2
Not spilling
→

Spilled before its works

937 events since 2020 · started while Compton And Marldon STW stayed shut

8 Sept, 09:00
1h 45m
17.1
Stayed shut
→
6 Jun, 02:32
34m
15.2
Stayed shut
→
1 Jun, 21:46
36m
17.5
Stayed shut
→
1 Jun, 20:56
34m
17.5
Stayed shut
→
19 May, 01:46
1h 20m
14.2
Stayed shut
→
2 May, 13:50
1h 24m
12.2
Stayed shut
→
15 Apr, 11:10
1h 24m
7.5
Stayed shut
→
14 Apr, 08:02
1h 2m
6.4
Stayed shut
→
11 Apr, 22:38
26m
10.3
Stayed shut
→
11 Apr, 18:28
20m
10.3
Stayed shut
→
24 Mar, 23:48
34m
4.3
Stayed shut
→
16 Mar, 08:52
18m
2.7
Stayed shut
→

Spills by month, 2023

Dry Wet weather
43Jan
4Feb
27Mar
45Apr
18May
Jun
8Jul
1Aug
1Sep
17Oct
6Nov
141Dec

Every spill in 2023, most recent first

Each event checked against the nearest rain gauge and against the treatment works’ own overflow. Open any row for its evidence dossier.

30 Dec, 17:26
27h 58m
20.1 mm
Wet weather
Not spilling — flagged before STW
→
30 Dec, 07:22
52m
20.1 mm
Wet weather
Not spilling — flagged before STW
→
28 Dec, 11:50
16m
16.0 mm
Wet weather
Not spilling — flagged before STW
→
28 Dec, 09:36
1h 44m
16.0 mm
Wet weather
Not spilling — flagged before STW
→
27 Dec, 08:36
14h 38m
16.0 mm
Wet weather
Not spilling — flagged before STW
→
27 Dec, 07:16
40m
16.0 mm
Wet weather
Not spilling — flagged before STW
→
27 Dec, 04:40
30m
16.0 mm
Wet weather
Not spilling — flagged before STW
→
27 Dec, 00:42
1h 0m
16.0 mm
Wet weather
Not spilling — flagged before STW
→
26 Dec, 23:58
18m
8.1 mm
Wet weather
Not spilling — flagged before STW
→
26 Dec, 22:02
32m
8.1 mm
Wet weather
Not spilling — flagged before STW
→
26 Dec, 10:00
1h 12m
8.1 mm
Wet weather
Not spilling — flagged before STW
→
25 Dec, 17:58
4h 2m
5.5 mm
Wet weather
Not spilling — flagged before STW
→
25 Dec, 08:50
8h 30m
5.5 mm
Wet weather
Not spilling — flagged before STW
→
24 Dec, 08:56
3h 14m
2.9 mm
Wet weather
Not spilling — flagged before STW
→
23 Dec, 17:56
24m
1.6 mm
Wet weather
Not spilling — flagged before STW
→
23 Dec, 07:58
6h 10m
1.6 mm
Wet weather
Not spilling — flagged before STW
→
19 Dec, 20:54
73h 28m
6.2 mm
Wet weather
Not spilling — flagged before STW
→
19 Dec, 09:26
11h 28m
6.2 mm
Wet weather
Not spilling — flagged before STW
→
18 Dec, 08:40
24h 46m
6.2 mm
Wet weather
Not spilling — flagged before STW
→
17 Dec, 20:36
12h 4m
0.5 mm
Wet weather
Not spilling — flagged before STW
→
17 Dec, 11:58
8h 38m
0.5 mm
Wet weather
Not spilling — flagged before STW
→
17 Dec, 06:08
5h 50m
0.5 mm
Wet weather
Not spilling — flagged before STW
→
16 Dec, 00:52
29h 16m
0.5 mm
Wet weather
Not spilling — flagged before STW
→
15 Dec, 20:16
4h 36m
0.4 mm
Wet weather
Not spilling — flagged before STW
→
15 Dec, 15:44
4h 32m
0.4 mm
Wet weather
Not spilling — flagged before STW
→
15 Dec, 13:08
2h 36m
0.4 mm
Wet weather
Not spilling — flagged before STW
→
15 Dec, 10:20
2h 48m
0.4 mm
Wet weather
Not spilling — flagged before STW
→
14 Dec, 23:22
10h 58m
0.8 mm
Wet weather
Not spilling — flagged before STW
→
14 Dec, 19:36
3h 46m
0.8 mm
Wet weather
Not spilling — flagged before STW
→
14 Dec, 07:24
12h 12m
0.8 mm
Wet weather
Not spilling — flagged before STW
→
14 Dec, 04:44
2h 40m
0.8 mm
Wet weather
Not spilling — flagged before STW
→
14 Dec, 04:08
36m
0.8 mm
Wet weather
Not spilling — flagged before STW
→
14 Dec, 02:52
1h 8m
0.8 mm
Wet weather
Not spilling — flagged before STW
→
14 Dec, 02:14
38m
0.8 mm
Wet weather
Not spilling — flagged before STW
→
13 Dec, 22:18
3h 56m
7.5 mm
Wet weather
Not spilling — flagged before STW
→
13 Dec, 21:50
28m
7.5 mm
Wet weather
Not spilling — flagged before STW
→
13 Dec, 21:02
48m
7.5 mm
Wet weather
Not spilling — flagged before STW
→
13 Dec, 19:48
1h 14m
7.5 mm
Wet weather
Not spilling — flagged before STW
→
13 Dec, 18:42
1h 6m
7.5 mm
Wet weather
Not spilling — flagged before STW
→
13 Dec, 13:58
4h 44m
7.5 mm
Wet weather
Not spilling — flagged before STW
→
13 Dec, 12:00
1h 58m
7.5 mm
Wet weather
Not spilling — flagged before STW
→
13 Dec, 08:50
3h 10m
7.5 mm
Wet weather
Not spilling — flagged before STW
→
13 Dec, 07:46
1h 2m
7.5 mm
Wet weather
Not spilling — flagged before STW
→
13 Dec, 06:20
1h 26m
7.5 mm
Wet weather
Not spilling — flagged before STW
→
13 Dec, 05:20
1h 0m
7.5 mm
Wet weather
Not spilling — flagged before STW
→
13 Dec, 04:32
48m
7.5 mm
Wet weather
Not spilling — flagged before STW
→
12 Dec, 23:42
4h 50m
7.5 mm
Wet weather
Not spilling — flagged before STW
→
12 Dec, 21:46
1h 56m
7.5 mm
Wet weather
Not spilling — flagged before STW
→
12 Dec, 21:14
32m
7.5 mm
Wet weather
Not spilling — flagged before STW
→
12 Dec, 15:30
5h 24m
7.5 mm
Wet weather
Not spilling — flagged before STW
→
12 Dec, 12:48
2h 42m
7.5 mm
Wet weather
Not spilling — flagged before STW
→
12 Dec, 12:06
42m
7.5 mm
Wet weather
Not spilling — flagged before STW
→
12 Dec, 10:24
1h 38m
7.5 mm
Wet weather
Not spilling — flagged before STW
→
12 Dec, 09:14
1h 10m
7.5 mm
Wet weather
Not spilling — flagged before STW
→
12 Dec, 08:42
32m
7.5 mm
Wet weather
Not spilling — flagged before STW
→
12 Dec, 07:48
54m
7.5 mm
Wet weather
Not spilling — flagged before STW
→
12 Dec, 07:16
32m
7.5 mm
Wet weather
Not spilling — flagged before STW
→
12 Dec, 07:00
16m
7.5 mm
Wet weather
Not spilling — flagged before STW
→
12 Dec, 06:16
44m
7.5 mm
Wet weather
Not spilling — flagged before STW
→
12 Dec, 06:00
16m
7.5 mm
Wet weather
Not spilling — flagged before STW
→
12 Dec, 04:52
1h 8m
7.5 mm
Wet weather
Not spilling — flagged before STW
→
12 Dec, 04:08
44m
7.5 mm
Wet weather
Not spilling — flagged before STW
→
12 Dec, 03:48
20m
7.5 mm
Wet weather
Not spilling — flagged before STW
→
12 Dec, 02:46
1h 2m
7.5 mm
Wet weather
Not spilling — flagged before STW
→
12 Dec, 02:18
28m
7.5 mm
Wet weather
Not spilling — flagged before STW
→
12 Dec, 01:06
1h 12m
7.5 mm
Wet weather
Not spilling — flagged before STW
→
11 Dec, 23:56
50m
7.3 mm
Wet weather
Not spilling — flagged before STW
→
11 Dec, 21:46
2h 10m
7.3 mm
Wet weather
Not spilling — flagged before STW
→
11 Dec, 20:46
1h 0m
7.3 mm
Wet weather
Not spilling — flagged before STW
→
11 Dec, 17:28
3h 18m
7.3 mm
Wet weather
Not spilling — flagged before STW
→
11 Dec, 17:08
20m
7.3 mm
Wet weather
Not spilling — flagged before STW
→
11 Dec, 16:40
28m
7.3 mm
Wet weather
Not spilling — flagged before STW
→
11 Dec, 16:12
28m
7.3 mm
Wet weather
Not spilling — flagged before STW
→
11 Dec, 15:00
1h 4m
7.3 mm
Wet weather
Not spilling — flagged before STW
→
11 Dec, 14:24
36m
7.3 mm
Wet weather
Not spilling — flagged before STW
→
11 Dec, 14:02
22m
7.3 mm
Wet weather
Not spilling — flagged before STW
→
11 Dec, 12:38
1h 24m
7.3 mm
Wet weather
Not spilling — flagged before STW
→
11 Dec, 11:20
1h 18m
7.3 mm
Wet weather
Not spilling — flagged before STW
→
11 Dec, 09:32
1h 48m
7.3 mm
Wet weather
Not spilling — flagged before STW
→
11 Dec, 06:30
3h 2m
7.3 mm
Wet weather
Not spilling — flagged before STW
→

Showing the last 80 events of 311 in 2023.

143 brief spills under 15 minutes in 2023

Excluded from the counts, classification and flags above — too short to weigh against rainfall, and often an operational blip rather than a genuine discharge. Listed here for completeness. How we know.

31 Dec, 21:44 · 8m31 Dec, 21:26 · 14m30 Dec, 11:30 · 2m29 Dec, 10:30 · 2m29 Dec, 10:16 · 4m28 Dec, 22:20 · 2m28 Dec, 17:54 · 8m28 Dec, 13:06 · 4m28 Dec, 12:54 · 8m28 Dec, 12:18 · 4m28 Dec, 12:10 · 4m28 Dec, 11:36 · 8m28 Dec, 11:22 · 10m28 Dec, 09:26 · 6m27 Dec, 23:34 · 4m27 Dec, 23:18 · 10m27 Dec, 02:06 · 10m26 Dec, 11:14 · 4m26 Dec, 09:50 · 6m25 Dec, 17:48 · 4m25 Dec, 17:36 · 4m25 Dec, 17:22 · 8m25 Dec, 01:12 · 10m24 Dec, 18:16 · 6m24 Dec, 18:06 · 6m24 Dec, 17:52 · 2m24 Dec, 17:18 · 14m24 Dec, 17:04 · 4m24 Dec, 14:46 · 2m24 Dec, 12:56 · 4m24 Dec, 12:40 · 6m24 Dec, 12:30 · 2m24 Dec, 12:14 · 4m24 Dec, 08:48 · 4m24 Dec, 02:14 · 6m23 Dec, 21:30 · 4m23 Dec, 21:14 · 10m23 Dec, 21:00 · 8m23 Dec, 20:50 · 4m23 Dec, 20:00 · 6m+103 more