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← All spills

Compton Castle

SBB00301
Overflow on the network feeding Compton And Marldon STW · Combined sewer overflow
Shellfish water · Teign Estuary
Showing history for 2025 · records go back to 2020
Not spilling

The monitor is reporting and shows no discharge.

Last spill ended
8 Sept, 10:44
Counted spills, 2025
69
232 discharge events
Hours spilled, 2025
645
Is the feed working?
Working
Last checked 21 min ago · we poll SWW hourly
48h agonow
48/48 hourly readings received
Dry spills, 2025
4
4 in 2025 · 134 since 2020
How a dry spill is decided →
Spilled before its STW, 2025
232
232 in 2025 · 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

2025: 69 spills · 232 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, 2025

Dry Wet weather
Jan
Feb
Mar
10Apr
2May
6Jun
Jul
8Aug
8Sep
4Oct
14Nov
180Dec

Every spill in 2025, 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.

31 Dec, 05:34
18h 26m
0.1 mm
Dry spill
Not spilling — flagged before STW
→
31 Dec, 04:56
28m
0.1 mm
Dry spill
Not spilling — flagged before STW
→
31 Dec, 04:22
26m
0.1 mm
Dry spill
Not spilling — flagged before STW
→
29 Dec, 12:12
40h 2m
0.1 mm
Dry spill
Not spilling — flagged before STW
→
24 Dec, 13:24
118h 48m
0.3 mm
Wet weather
Not spilling — flagged before STW
→
23 Dec, 21:56
15h 28m
1.9 mm
Wet weather
Not spilling — flagged before STW
→
23 Dec, 17:56
4h 0m
1.9 mm
Wet weather
Not spilling — flagged before STW
→
23 Dec, 13:12
4h 44m
1.9 mm
Wet weather
Not spilling — flagged before STW
→
23 Dec, 12:16
56m
1.9 mm
Wet weather
Not spilling — flagged before STW
→
23 Dec, 11:30
46m
1.9 mm
Wet weather
Not spilling — flagged before STW
→
23 Dec, 10:34
46m
1.9 mm
Wet weather
Not spilling — flagged before STW
→
23 Dec, 10:08
26m
1.9 mm
Wet weather
Not spilling — flagged before STW
→
23 Dec, 09:50
18m
1.9 mm
Wet weather
Not spilling — flagged before STW
→
23 Dec, 08:46
1h 4m
1.9 mm
Wet weather
Not spilling — flagged before STW
→
23 Dec, 08:16
30m
1.9 mm
Wet weather
Not spilling — flagged before STW
→
23 Dec, 07:04
1h 12m
1.9 mm
Wet weather
Not spilling — flagged before STW
→
23 Dec, 06:24
40m
1.9 mm
Wet weather
Not spilling — flagged before STW
→
23 Dec, 05:00
1h 24m
1.9 mm
Wet weather
Not spilling — flagged before STW
→
23 Dec, 04:08
52m
1.9 mm
Wet weather
Not spilling — flagged before STW
→
23 Dec, 02:36
1h 32m
1.9 mm
Wet weather
Not spilling — flagged before STW
→
23 Dec, 00:52
1h 44m
1.9 mm
Wet weather
Not spilling — flagged before STW
→
22 Dec, 23:20
1h 32m
7.8 mm
Wet weather
Not spilling — flagged before STW
→
22 Dec, 22:46
34m
7.8 mm
Wet weather
Not spilling — flagged before STW
→
22 Dec, 20:44
2h 2m
7.8 mm
Wet weather
Not spilling — flagged before STW
→
22 Dec, 18:24
2h 20m
7.8 mm
Wet weather
Not spilling — flagged before STW
→
22 Dec, 15:46
2h 38m
7.8 mm
Wet weather
Not spilling — flagged before STW
→
22 Dec, 14:18
1h 28m
7.8 mm
Wet weather
Not spilling — flagged before STW
→
22 Dec, 13:56
20m
7.8 mm
Wet weather
Not spilling — flagged before STW
→
22 Dec, 13:28
26m
7.8 mm
Wet weather
Not spilling — flagged before STW
→
22 Dec, 11:50
1h 36m
7.8 mm
Wet weather
Not spilling — flagged before STW
→
22 Dec, 10:44
40m
7.8 mm
Wet weather
Not spilling — flagged before STW
→
22 Dec, 10:12
30m
7.8 mm
Wet weather
Not spilling — flagged before STW
→
22 Dec, 09:12
58m
7.8 mm
Wet weather
Not spilling — flagged before STW
→
22 Dec, 08:44
26m
7.8 mm
Wet weather
Not spilling — flagged before STW
→
22 Dec, 08:12
30m
7.8 mm
Wet weather
Not spilling — flagged before STW
→
22 Dec, 02:50
5h 20m
7.8 mm
Wet weather
Not spilling — flagged before STW
→
22 Dec, 00:06
2h 42m
7.8 mm
Wet weather
Not spilling — flagged before STW
→
21 Dec, 23:38
26m
7.8 mm
Wet weather
Not spilling — flagged before STW
→
21 Dec, 21:54
1h 2m
7.8 mm
Wet weather
Not spilling — flagged before STW
→
21 Dec, 19:16
2h 28m
7.8 mm
Wet weather
Not spilling — flagged before STW
→
21 Dec, 18:34
42m
7.8 mm
Wet weather
Not spilling — flagged before STW
→
21 Dec, 17:50
40m
7.8 mm
Wet weather
Not spilling — flagged before STW
→
21 Dec, 16:52
58m
7.8 mm
Wet weather
Not spilling — flagged before STW
→
21 Dec, 15:32
1h 20m
7.8 mm
Wet weather
Not spilling — flagged before STW
→
21 Dec, 14:52
40m
7.8 mm
Wet weather
Not spilling — flagged before STW
→
21 Dec, 13:22
1h 30m
7.8 mm
Wet weather
Not spilling — flagged before STW
→
21 Dec, 12:26
56m
7.8 mm
Wet weather
Not spilling — flagged before STW
→
21 Dec, 11:40
30m
7.8 mm
Wet weather
Not spilling — flagged before STW
→
21 Dec, 09:58
1h 42m
7.8 mm
Wet weather
Not spilling — flagged before STW
→
21 Dec, 08:50
1h 8m
7.8 mm
Wet weather
Not spilling — flagged before STW
→
21 Dec, 08:28
22m
7.8 mm
Wet weather
Not spilling — flagged before STW
→
21 Dec, 08:08
20m
7.8 mm
Wet weather
Not spilling — flagged before STW
→
21 Dec, 07:42
26m
7.8 mm
Wet weather
Not spilling — flagged before STW
→
21 Dec, 07:26
16m
7.8 mm
Wet weather
Not spilling — flagged before STW
→
21 Dec, 05:38
1h 48m
7.8 mm
Wet weather
Not spilling — flagged before STW
→
21 Dec, 03:50
1h 48m
7.8 mm
Wet weather
Not spilling — flagged before STW
→
21 Dec, 03:28
22m
7.8 mm
Wet weather
Not spilling — flagged before STW
→
21 Dec, 02:36
52m
7.8 mm
Wet weather
Not spilling — flagged before STW
→
20 Dec, 22:56
3h 40m
3.6 mm
Wet weather
Not spilling — flagged before STW
→
20 Dec, 21:42
1h 2m
3.6 mm
Wet weather
Not spilling — flagged before STW
→
20 Dec, 20:34
1h 0m
3.6 mm
Wet weather
Not spilling — flagged before STW
→
20 Dec, 20:14
20m
3.6 mm
Wet weather
Not spilling — flagged before STW
→
20 Dec, 19:28
36m
3.6 mm
Wet weather
Not spilling — flagged before STW
→
20 Dec, 18:02
1h 26m
3.6 mm
Wet weather
Not spilling — flagged before STW
→
20 Dec, 16:40
1h 22m
3.6 mm
Wet weather
Not spilling — flagged before STW
→
20 Dec, 15:36
42m
3.6 mm
Wet weather
Not spilling — flagged before STW
→
20 Dec, 13:24
2h 12m
3.6 mm
Wet weather
Not spilling — flagged before STW
→
20 Dec, 12:32
52m
3.6 mm
Wet weather
Not spilling — flagged before STW
→
20 Dec, 09:08
3h 10m
3.6 mm
Wet weather
Not spilling — flagged before STW
→
20 Dec, 07:04
1h 48m
3.6 mm
Wet weather
Not spilling — flagged before STW
→
20 Dec, 06:16
32m
3.6 mm
Wet weather
Not spilling — flagged before STW
→
20 Dec, 04:16
2h 0m
3.6 mm
Wet weather
Not spilling — flagged before STW
→
20 Dec, 01:36
2h 40m
3.6 mm
Wet weather
Not spilling — flagged before STW
→
20 Dec, 00:44
52m
3.6 mm
Wet weather
Not spilling — flagged before STW
→
19 Dec, 23:58
46m
19.7 mm
Wet weather
Not spilling — flagged before STW
→
19 Dec, 22:48
40m
19.7 mm
Wet weather
Not spilling — flagged before STW
→
19 Dec, 21:26
1h 22m
19.7 mm
Wet weather
Not spilling — flagged before STW
→
19 Dec, 19:50
1h 20m
19.7 mm
Wet weather
Not spilling — flagged before STW
→
19 Dec, 18:28
1h 0m
19.7 mm
Wet weather
Not spilling — flagged before STW
→
19 Dec, 15:26
2h 52m
19.7 mm
Wet weather
Not spilling — flagged before STW
→

Showing the last 80 events of 232 in 2025.

105 brief spills under 15 minutes in 2025

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.

23 Dec, 11:20 · 10m22 Dec, 11:34 · 14m22 Dec, 11:30 · 2m22 Dec, 11:26 · 2m21 Dec, 23:22 · 14m21 Dec, 23:16 · 4m21 Dec, 23:10 · 4m21 Dec, 22:58 · 10m21 Dec, 21:44 · 6m21 Dec, 18:30 · 4m21 Dec, 12:22 · 4m21 Dec, 12:10 · 12m20 Dec, 22:44 · 12m20 Dec, 21:34 · 8m20 Dec, 20:04 · 10m20 Dec, 16:30 · 10m20 Dec, 16:26 · 4m20 Dec, 16:18 · 8m20 Dec, 12:18 · 14m20 Dec, 09:06 · 2m20 Dec, 08:52 · 14m20 Dec, 07:00 · 4m20 Dec, 06:48 · 12m19 Dec, 23:50 · 8m19 Dec, 23:42 · 8m19 Dec, 23:30 · 12m19 Dec, 21:20 · 6m19 Dec, 21:10 · 10m19 Dec, 19:42 · 8m19 Dec, 19:28 · 14m19 Dec, 18:18 · 10m19 Dec, 11:04 · 4m19 Dec, 02:48 · 12m19 Dec, 01:28 · 12m19 Dec, 01:22 · 6m19 Dec, 00:24 · 2m18 Dec, 21:02 · 14m18 Dec, 11:54 · 14m18 Dec, 08:44 · 12m18 Dec, 06:48 · 10m+65 more