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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 2026 · records go back to 2020
Not spilling

The monitor is reporting and shows no discharge.

Last spill ended
8 Sept, 10:44
Counted spills, 2026
94
198 discharge events
Hours spilled, 2026
1,465
Is the feed working?
Working
Last checked 32 min ago · we poll SWW hourly
48h agonow
48/48 hourly readings received
Dry spills, 2026
0
None in 2026 · 134 since 2020
How a dry spill is decided →
Spilled before its STW, 2026
198
198 in 2026 · 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

2026: 94 spills · 198 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 — 2026 to date

Dry Wet weather
86Jan
76Feb
26Mar
4Apr
2May
3Jun
Jul
Aug
1Sep

Every spill in 2026, 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.

8 Sept, 09:00
1h 45m
17.1 mm
Wet weather
Not spilling — flagged before STW
→
6 Jun, 02:32
34m
15.2 mm
Wet weather
Not spilling — flagged before STW
→
1 Jun, 21:46
36m
17.5 mm
Wet weather
Not spilling — flagged before STW
→
1 Jun, 20:56
34m
17.5 mm
Wet weather
Not spilling — flagged before STW
→
19 May, 01:46
1h 20m
14.2 mm
Wet weather
Not spilling — flagged before STW
→
2 May, 13:50
1h 24m
12.2 mm
Wet weather
Not spilling — flagged before STW
→
15 Apr, 11:10
1h 24m
7.5 mm
Wet weather
Not spilling — flagged before STW
→
14 Apr, 08:02
1h 2m
6.4 mm
Wet weather
Not spilling — flagged before STW
→
11 Apr, 22:38
26m
10.3 mm
Wet weather
Not spilling — flagged before STW
→
11 Apr, 18:28
20m
10.3 mm
Wet weather
Not spilling — flagged before STW
→
24 Mar, 23:48
34m
4.3 mm
Wet weather
Not spilling — flagged before STW
→
16 Mar, 08:52
18m
2.7 mm
Wet weather
Not spilling — flagged before STW
→
16 Mar, 07:40
1h 8m
2.7 mm
Wet weather
Not spilling — flagged before STW
→
15 Mar, 07:48
14h 6m
2.7 mm
Wet weather
Not spilling — flagged before STW
→
13 Mar, 07:20
41h 12m
21.2 mm
Wet weather
Not spilling — flagged before STW
→
13 Mar, 00:58
6h 22m
21.2 mm
Wet weather
Not spilling — flagged before STW
→
12 Mar, 10:32
14h 26m
21.2 mm
Wet weather
Not spilling — flagged before STW
→
10 Mar, 03:38
54h 54m
6.7 mm
Wet weather
Not spilling — flagged before STW
→
9 Mar, 05:20
22h 18m
4.9 mm
Wet weather
Not spilling — flagged before STW
→
8 Mar, 09:28
19h 52m
4.9 mm
Wet weather
Not spilling — flagged before STW
→
7 Mar, 13:02
20h 26m
2.8 mm
Wet weather
Not spilling — flagged before STW
→
5 Mar, 19:10
41h 52m
1.4 mm
Wet weather
Not spilling — flagged before STW
→
5 Mar, 10:36
8h 34m
1.4 mm
Wet weather
Not spilling — flagged before STW
→
5 Mar, 10:20
16m
1.4 mm
Wet weather
Not spilling — flagged before STW
→
5 Mar, 04:04
6h 16m
1.4 mm
Wet weather
Not spilling — flagged before STW
→
5 Mar, 03:46
18m
1.4 mm
Wet weather
Not spilling — flagged before STW
→
4 Mar, 20:10
7h 36m
1.5 mm
Wet weather
Not spilling — flagged before STW
→
4 Mar, 18:56
1h 14m
1.5 mm
Wet weather
Not spilling — flagged before STW
→
4 Mar, 18:24
32m
1.5 mm
Wet weather
Not spilling — flagged before STW
→
4 Mar, 17:22
1h 2m
1.5 mm
Wet weather
Not spilling — flagged before STW
→
4 Mar, 01:24
15h 58m
1.5 mm
Wet weather
Not spilling — flagged before STW
→
4 Mar, 00:08
1h 16m
1.5 mm
Wet weather
Not spilling — flagged before STW
→
3 Mar, 22:10
1h 58m
1.5 mm
Wet weather
Not spilling — flagged before STW
→
3 Mar, 17:34
4h 36m
1.5 mm
Wet weather
Not spilling — flagged before STW
→
1 Mar, 07:54
57h 40m
8.0 mm
Wet weather
Not spilling — flagged before STW
→
1 Mar, 00:04
7h 50m
8.0 mm
Wet weather
Not spilling — flagged before STW
→
28 Feb, 16:06
7h 58m
8.6 mm
Wet weather
Not spilling — flagged before STW
→
28 Feb, 07:34
8h 32m
8.6 mm
Wet weather
Not spilling — flagged before STW
→
27 Feb, 22:10
9h 24m
21.7 mm
Wet weather
Not spilling — flagged before STW
→
27 Feb, 21:40
30m
21.7 mm
Wet weather
Not spilling — flagged before STW
→
26 Feb, 21:08
24h 28m
21.7 mm
Wet weather
Not spilling — flagged before STW
→
26 Feb, 02:44
18h 24m
21.7 mm
Wet weather
Not spilling — flagged before STW
→
25 Feb, 21:04
5h 40m
0.6 mm
Wet weather
Not spilling — flagged before STW
→
25 Feb, 18:58
2h 6m
0.6 mm
Wet weather
Not spilling — flagged before STW
→
25 Feb, 03:24
15h 34m
0.6 mm
Wet weather
Not spilling — flagged before STW
→
24 Feb, 19:52
7h 32m
0.6 mm
Wet weather
Not spilling — flagged before STW
→
24 Feb, 09:12
10h 40m
0.6 mm
Wet weather
Not spilling — flagged before STW
→
24 Feb, 04:58
4h 14m
0.6 mm
Wet weather
Not spilling — flagged before STW
→
24 Feb, 02:30
2h 28m
0.6 mm
Wet weather
Not spilling — flagged before STW
→
23 Feb, 16:26
10h 4m
2.0 mm
Wet weather
Not spilling — flagged before STW
→
23 Feb, 12:28
3h 58m
2.0 mm
Wet weather
Not spilling — flagged before STW
→
23 Feb, 11:54
32m
2.0 mm
Wet weather
Not spilling — flagged before STW
→
23 Feb, 08:14
3h 38m
2.0 mm
Wet weather
Not spilling — flagged before STW
→
23 Feb, 06:06
2h 8m
2.0 mm
Wet weather
Not spilling — flagged before STW
→
23 Feb, 04:32
1h 34m
2.0 mm
Wet weather
Not spilling — flagged before STW
→
23 Feb, 01:38
2h 54m
2.0 mm
Wet weather
Not spilling — flagged before STW
→
22 Feb, 20:18
5h 20m
5.8 mm
Wet weather
Not spilling — flagged before STW
→
22 Feb, 06:58
13h 20m
5.8 mm
Wet weather
Not spilling — flagged before STW
→
22 Feb, 01:20
5h 38m
5.8 mm
Wet weather
Not spilling — flagged before STW
→
22 Feb, 00:12
1h 8m
5.8 mm
Wet weather
Not spilling — flagged before STW
→
21 Feb, 17:26
6h 46m
5.8 mm
Wet weather
Not spilling — flagged before STW
→
21 Feb, 15:36
1h 50m
5.8 mm
Wet weather
Not spilling — flagged before STW
→
21 Feb, 14:04
1h 32m
5.8 mm
Wet weather
Not spilling — flagged before STW
→
21 Feb, 06:32
7h 32m
5.8 mm
Wet weather
Not spilling — flagged before STW
→
21 Feb, 04:16
2h 16m
5.8 mm
Wet weather
Not spilling — flagged before STW
→
20 Feb, 22:16
5h 52m
2.3 mm
Wet weather
Not spilling — flagged before STW
→
20 Feb, 21:56
20m
2.3 mm
Wet weather
Not spilling — flagged before STW
→
20 Feb, 13:12
8h 44m
2.3 mm
Wet weather
Not spilling — flagged before STW
→
20 Feb, 12:14
58m
2.3 mm
Wet weather
Not spilling — flagged before STW
→
20 Feb, 08:52
3h 22m
2.3 mm
Wet weather
Not spilling — flagged before STW
→
20 Feb, 03:04
5h 48m
2.3 mm
Wet weather
Not spilling — flagged before STW
→
19 Feb, 18:50
8h 14m
26.7 mm
Wet weather
Not spilling — flagged before STW
→
19 Feb, 12:22
6h 28m
26.7 mm
Wet weather
Not spilling — flagged before STW
→
19 Feb, 10:34
1h 48m
26.7 mm
Wet weather
Not spilling — flagged before STW
→
15 Feb, 16:12
20h 18m
10.4 mm
Wet weather
Not spilling — flagged before STW
→
15 Feb, 14:42
1h 12m
10.4 mm
Wet weather
Not spilling — flagged before STW
→
15 Feb, 13:06
1h 16m
10.4 mm
Wet weather
Not spilling — flagged before STW
→
14 Feb, 15:00
21h 50m
7.2 mm
Wet weather
Not spilling — flagged before STW
→
14 Feb, 13:28
1h 0m
7.2 mm
Wet weather
Not spilling — flagged before STW
→
14 Feb, 11:48
1h 12m
7.2 mm
Wet weather
Not spilling — flagged before STW
→

Showing the last 80 events of 198 in 2026.

96 brief spills under 15 minutes in 2026

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.

8 Sept, 06:32 · 6m4 Sept, 06:56 · 6m29 Aug, 07:44 · 2m6 Jun, 04:54 · 2m6 Jun, 04:54 · 2m6 Jun, 04:34 · 4m3 Jun, 08:08 · 10m1 Jun, 19:46 · 6m1 Jun, 17:06 · 4m17 May, 12:16 · 14m20 Mar, 09:50 · 10m18 Mar, 07:58 · 4m17 Mar, 08:32 · 2m17 Mar, 07:48 · 4m16 Mar, 11:40 · 10m16 Mar, 10:30 · 4m16 Mar, 09:50 · 4m16 Mar, 09:36 · 6m16 Mar, 09:12 · 10m16 Mar, 07:26 · 8m16 Mar, 07:14 · 8m15 Mar, 22:36 · 6m15 Mar, 07:28 · 10m15 Mar, 07:08 · 8m15 Mar, 01:54 · 6m15 Mar, 01:12 · 12m15 Mar, 00:42 · 10m27 Feb, 21:36 · 4m21 Feb, 04:08 · 8m16 Feb, 12:30 · 2m15 Feb, 14:32 · 8m15 Feb, 14:28 · 2m15 Feb, 14:24 · 2m15 Feb, 12:52 · 6m14 Feb, 14:54 · 2m14 Feb, 14:50 · 2m14 Feb, 14:46 · 2m14 Feb, 14:42 · 2m14 Feb, 14:32 · 2m14 Feb, 13:22 · 4m+56 more