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Hafren Dyfrdwy storm overflows

54 storm overflows · regulated by Natural Resources Wales.

Discharging now
—
No live feed is published
Spills in 2025
1,165
official, from 54 monitored overflows
Hours in 2025
8,475
total discharge time, 157 h per overflow
Average per overflow
21.6
spills each in 2025 · -40% on 2024 (35.9)

Discharging now

Hafren Dyfrdwy does not publish a live status for its overflows.

Year by year

Spills reported across all of Hafren Dyfrdwy's monitored overflows.

202349 sites
1,899 spills · 16k h
202454 sites
1,939 spills · 18k h
202554 sites
1,165 spills · 8,475 h

More overflows were monitored each year (49 in 2023, 54 in 2025), so part of any rise is more monitors, not only more spilling.

Hafren Dyfrdwy's annual Event Duration Monitoring return to Natural Resources Wales (12/24-hour spill count), as compiled by The Rivers Trust. Overflows with no usable monitor data in a year are left out of it, not counted as zero.

Most spills in 2025

The overflows that spilled most often. A red tag means discharging right now.

1
Llanwddyn Wastewater Treatment Works Watercourse not named
901,736 h
2
Knighton (STW) Watercourse not named
851,235 h
3
Pen-Y-Bont-Fawr Wastewater Treatment Works Watercourse not named
69627 h
4
Caersws Wastewater Treatment Works Watercourse not named
56615 h
5
Montgomery Waste Water Treatment Works Watercourse not named
46449 h
6
Carno (STW) Watercourse not named
44191 h
7
Caersws TPS Watercourse not named
4457 h
8
Trewern Wastewater Treatment Works Watercourse not named
43583 h
9
Guilsfield Wastewater Treatment Works Watercourse not named
4247 h
10
Llanfyllin Wastewater Treatment Works Watercourse not named
41387 h
11
Llanidloes - Longbridge South 2 (CSO) Watercourse not named
41 
12
Newtown - Ponthafren Longbridge (CSO) Watercourse not named
36108 h
13
Llanfair Caereinion Waste Water Treatment Works Watercourse not named
34122 h
14
Llanfair Caereinion - Railway Stn, Penybontfawr, Carno, Llanfyllin - Ffordd Y Cain (CSO) Watercourse not named
32220 h
15
Llanwddyn - Abertridwr (PS) Watercourse not named
32576 h
16
Welshpool (STW) Watercourse not named
30164 h
17
Llansantffraid (SPS) Watercourse not named
26144 h
18
Welshpool (STW) Watercourse not named
2524 h
19
Meifod Wastewater Treatment Works Watercourse not named
23380 h
20
CSO At Llanrhaeadr Waste Water Treatment Works Watercourse not named
22109 h
21
Llanidloes Wastewater Treatment Works Watercourse not named
21245 h
22
Newtown Outfall Sewer Adj WRW (CSO) Watercourse not named
20 
23
Newtown (CSO) Watercourse not named
1910 h
24
Church Stoke (SPS) Watercourse not named
19 
25
Llanidloes - Shortbridge Street, Longbridge South & Longbridge North (CSO) Watercourse not named
186 h

Concerned about an overflow?

Report pollution you can see to Natural Resources Wales on 0300 065 3000 — they log and investigate incidents. Complaints about a company's service go to the company first.

Complain to Hafren Dyfrdwy ↗ Report pollution ↗ All companies & rankings

Annual figures: The Rivers Trust EDM compilation, © Hafren Dyfrdwy, Open Government Licence. FloodRadar republishes the monitors' status and the published figures; it does not measure discharges itself, and a monitor reports a discharge, not its volume or its cause.