St Austell Bay Boat Club - Members Launching Facility in St Austell

Water Quality & Storm Overflows

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Water Quality & Storm Overflows

St Austell Bay is surrounded by beautiful coastal waters and several designated bathing beaches. Keeping informed about local water quality is essential for all members, whether launching boats, kayaking or enjoying a swim. This page brings together bathing water quality data from the Environment Agency for beaches from Polkerris and Par Sands round to Mevagissey and Gorran Haven, alongside storm overflow activity from South West Water.

Bathing water quality can be affected by weather events, seasonal rainfall and localised land runoff. Annual classifications cover the May to September bathing season, while daily pollution risk forecasts and storm overflow status update far more often. We encourage all members and visitors to check these regularly before taking to the water.


Loading water quality & storm overflow data . . .

St Austell Bay & Mevagissey — Bathing Water Quality
(Source: Environment Agency & Defra)

Bathing Water Quality

Beach
Latest Annual Rating
Latest Results
Alerts
Polkerris
Excellent
(2025)
Wed 5 Aug 2026
★☆☆☆
E.coli 930 · IE 160 cfu/100ml
Rain affected Rain affected Swimfo
Par Sands
Good
(2025)
Wed 5 Aug 2026
★★★★
E.coli <10 · IE <10 cfu/100ml
Rain affected Rain affected Swimfo
Shorthorn (Central Carlyon Bay)
Excellent
(2025)
Wed 5 Aug 2026
★★★★
E.coli <10 · IE <10 cfu/100ml
Rain affected Rain affected Swimfo
Crinnis (East Carlyon Bay)
Excellent
(2025)
Wed 5 Aug 2026
★★★★
E.coli <10 · IE <10 cfu/100ml
Rain affected Rain affected Swimfo
Charlestown
Excellent
(2025)
Wed 5 Aug 2026
★★★★
E.coli <10 · IE <10 cfu/100ml
— Swimfo
Duporth
Excellent
(2025)
Wed 5 Aug 2026
★★★★
E.coli <10 · IE <10 cfu/100ml
— Swimfo
Porthpean
Excellent
(2025)
Wed 5 Aug 2026
★★★★
E.coli <10 · IE <10 cfu/100ml
Rain affected Rain affected Swimfo
Pentewan
Excellent
(2025)
Thu 6 Aug 2026
★★★★
E.coli <10 · IE <10 cfu/100ml
— Swimfo
Polstreath, Mevagissey
Excellent
(2025)
Thu 6 Aug 2026
★★★★
E.coli <10 · IE <10 cfu/100ml
— Swimfo
Portmellon
Excellent
(2025)
Thu 6 Aug 2026
★★★★
E.coli <10 · IE <10 cfu/100ml
Rain affected Rain affected Swimfo
Gorran Haven
Excellent
(2025)
Thu 6 Aug 2026
★★★★
E.coli <10 · IE <10 cfu/100ml
Rain affected Rain affected Swimfo

Water quality classifications are assessed annually (May–September bathing season) by the Environment Agency under the Bathing Water Regulations 2013. Data provided under the Open Government Licence v3.0.

Updated 3 hours ago



St Austell Bay & Mevagissey — Storm Overflows
(Source: South West Water)

Storm Overflows

Location
Watercourse
Status
Latest Event
Gorran Churchtown
Portmellon Stream(S)
No discharge
Mon 1 Jun 2026 @ 8:19 pm – 8:32 pm
(13min)
Gorran Haven
Atlantic Ocean (C)
No discharge
Mon 1 Jun 2026 @ 9:02 pm – 9:10 pm
(7min)
Portmellon
Stream (S)
No discharge
Tue 4 Nov 2025 @ 12:33 pm – 12:34 pm
(1min)
Mevagissey
Mevagissey Bay
No discharge
Sun 12 Apr 2026 @ 3:23 pm – 3:27 pm
(3min)
St Ewe
Caerhays Stream
No discharge
Thu 21 May 2026 @ 1:15 pm – 1:17 pm
(1min)
Nansladron, Pentewan Valley
Tributary Of White River
No discharge
Tue 7 Jul 2026 @ 12:35 pm – 1:16 pm
(40min)
Pentewan (Sconhoe)
St Austell River (S)
No discharge
Sat 20 Dec 2025 @ 6:38 pm – 6:46 pm
(8min)
St Mewan
Polgooth Stream
No discharge
Thu 21 May 2026 @ 10:48 am – 10:51 am
(2min)
Pentewan Valley (upper)
St Austell River(S)
No discharge
Fri 15 May 2026 @ 10:24 am – 10:25 am
(1min)
Pentewan Valley, Tregorrick (lower)
St Austell River
No discharge
Sat 6 Jun 2026 @ 8:57 am – 12:45 pm
(3hr 47min)
Higher Porthpean
St Austell Bay (C)
No discharge
Thu 23 Oct 2025 @ 8:41 am – 8:42 am
(1min)
Winsford, near Charlestown
Winsford Stream
No discharge
Fri 1 May 2026 @ 10:15 am – 10:18 am
(2min)
Charlestown / Higher Porthpean
St Austell Bay (C)
No discharge
Wed 3 Jun 2026 @ 8:53 pm – 9:06 pm
(12min)
Boscoppa Stream, St Austell
Sandy River
No discharge
Wed 22 Jul 2026 @ 1:38 pm – 1:43 pm
(5min)
Spit Point, Par
(C) St Austell Bay
No discharge
Sun 1 Feb 2026 @ 4:16 am – 4:35 am
(19min)
St Blazey Stream, Par
St Blazey Stream
No discharge
Fri 8 May 2026 @ 11:24 am – 11:25 am
(1min)
Par Harbour (River Par)
River Par
No discharge
Tue 19 May 2026 @ 2:54 pm – 3:49 pm
(55min)
Polkerris
St Austell Bay (C)
No discharge
Wed 3 Jun 2026 @ 8:59 pm – 9:10 pm
(10min)
Readymoney Cove, Fowey
River Fowey Estuary(E)
No discharge
Thu 23 Apr 2026 @ 9:18 am – 9:20 am
(1min)
Ready Money Corner, Fowey
River Fowey Estuary(E)
No discharge
Tue 20 Jan 2026 @ 10:11 am – 10:23 am
(11min)
Polruan
River Fowey Estuary(E)
No discharge
Mon 27 Apr 2026 @ 12:22 pm – 12:24 pm
(2min)
Esplanade, Fowey
River Fowey Estuary(E)
No discharge
Mon 20 Apr 2026 @ 10:35 am – 10:37 am
(2min)
Town Quay, Fowey
River Fowey Estuary (E)
No discharge
Sat 15 Aug 2026 @ 8:07 pm – 10:57 pm
(2hr 50min)
Passage Street, Fowey
River Fowey Estuary(E)
No discharge
Sat 15 Aug 2026 @ 7:47 pm – 10:02 pm
(2hr 15min)
Bodinnick Ferry Slip, Fowey
Fowey Estuary (E)
No discharge
Sat 15 Aug 2026 @ 11:18 pm – 1:41 am
(2hr 22min)
Bodinnick / Polruan
River Fowey Estuary
No discharge
Wed 18 Feb 2026 @ 5:25 pm – 5:46 pm
(20min)
Golant, River Fowey (upper estuary)
River Fowey Estuary (E)
No discharge
Sat 15 Aug 2026 @ 9:52 pm – 9:53 pm
(0min)

Data from South West Water's National Storm Overflow Hub, refreshed every ~10 minutes.

Updated 22 mins ago
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