For anglers · Sun, 20 Sep 2026
No sampling points are scoring all-green for anglers. 129 are amber, 177 red. The most common failure modes are elevated ammonia from sewage / agricultural runoff and active spills nearby.
Use the postcode finder above
Enter your postcode to see every overflow, sampling point and recent flag within 5 km of where you fish.
Switch to all-purpose mode
Our main safe-spots register shows 0 sampling points with all-green chemistry — useful for getting a feel for general river health even where nutrient readings are sparse.
Check your local angling association
The Angling Trust's Water Quality Monitoring Network trains volunteers to test nutrient pollution — adds high-frequency citizen-science readings on top of the EA feed.
Storm overflows currently discharging. Avoid fishing within 5 km downstream until conditions settle (typically 48 hours after heavy rain). Fish kills downstream of dry-weather spills are a direct ammonia-toxicity signal worth reporting.
Severn Trent Water · SVT01679 · spilling for 19 weeks
Dwr Cymru Welsh Water · Cwm Penmachno WwTW Storm Overflow · spilling for 6 days
Dwr Cymru Welsh Water · Commins Coch Storm Overflow · spilling for 4 days
Dwr Cymru Welsh Water · Maple Avenue Storm Overflow · spilling for 2 days
Dwr Cymru Welsh Water · Beddgelert WwTW Storm Overflow · spilling for 2 days
Dwr Cymru Welsh Water · Waterston WwTW Storm Overflow · spilling for 2 days
Dwr Cymru Welsh Water · Llan Ffestiniog WwTW Inlet Storm Overflow · spilling for 45 h
Dwr Cymru Welsh Water · Blaenau Ffestiniog WwTW Point 1 Storm Overflow · spilling for 44.1 h
Dwr Cymru Welsh Water · Llan Ffestiniog WwTW Settled Storm Overflow · spilling for 43.8 h
Dwr Cymru Welsh Water · Cwm Penmachno Storm Overflow · spilling for 43.1 h
Dwr Cymru Welsh Water · Waunfawr WwTW Storm Overflow · spilling for 43.1 h
Dwr Cymru Welsh Water · Dolwyddelan WwTW Storm Overflow · spilling for 42.9 h
Dwr Cymru Welsh Water · Llanwrtyd Wells Storm Overflow · spilling for 38.6 h
Dwr Cymru Welsh Water · Crosshands WwTW Storm Overflow · spilling for 36.9 h
Dwr Cymru Welsh Water · Cemetery Road Ogmore Vale Storm Overflow · spilling for 28.8 h
Yorkshire Water · YWS02298 · spilling for 28.6 h
Dwr Cymru Welsh Water · Llangeinor Bettws Street Storm Overflow · spilling for 27.6 h
Dwr Cymru Welsh Water · Cwmgwili WwTW Storm Overflow · spilling for 24.3 h
Dwr Cymru Welsh Water · Chain Road Storm Overflow · spilling for 7.1 h
Dwr Cymru Welsh Water · Chirk Bank Storm Overflow · spilling for 5.1 h
Dwr Cymru Welsh Water · Llanelltyd Storm Overflow · spilling for 5 h
Dwr Cymru Welsh Water · Cardigan WwTW Storm Overflow · spilling for 1.6 h
Dwr Cymru Welsh Water · Llanbrynmair Tafolwern WwTW Storm Overflow · spilling for 1.5 h
South West Water · SBB00409 · spilling for 1.1 h
Note: dissolved oxygen — the single most important indicator for fish — is published by the EA via the Hydrology API (continuous sondes), not WIMS (lab samples). We surface DO data directly on relevant overflow pages where a sonde is in range. Lab DO from WIMS is intermittent across the inland network and isn't in our safe-spot scoring as a result.