All swimming spots › Cornwall, England
Can I swim at Porthkidney Sands?
Cornwall, England · Estuary
Checking…
Before you get in
A red flag means do not go in, whatever this page says.
If you get into trouble, float on your back until the cold shock passes. Full advice below.
In an emergency call 999 and ask for the Coastguard, or 112 in the Republic of Ireland.
Water quality today
The last fortnight
What this verdict covers
Independent site, not an official one. This verdict is about water quality. It does not tell you whether the water is safe to get into today.
How it has been rated
The annual classification for 2021 to 2025. Each one is calculated from samples taken over up to four bathing seasons, so these overlap and none of them describes today.
Every sample, 2024 to 2026
45 samples, 2024 to 2026. The highest E. coli count in them was 530 per 100ml, on 31 August 2024; the standard for Excellent is 250 or below and for Good 500 or below.
One bar for each sample, oldest on the left. The taller the bar, the more E. coli that bottle held.
The scale is the same on every beach on this site, which is why a clean beach looks flat — the bars are measured against the standard rather than against that beach’s own worst day. Hover or tap a bar for that day’s figures. A single count over a line is not a failed beach. The classification is worked out as the 90th and 95th percentile of four years of samples, so one bad morning does not decide it — and one good morning does not either. 1 of these is above the Good standard, so it is pinned to the top with a notch rather than the chart stretching to fit it.
What these bacteria mean for you
Neither one is what makes people ill by itself. They are markers: they live in the gut, so finding them means sewage or animal waste has reached the water, and whatever else came with it is likely there too.
The usual way to catch something is swallowing the water, and the usual result is a stomach upset. Ear, eye, chest and skin infections are the other common ones. Putting your head under and swimming with an open cut both raise the odds.
The riskiest time is the day or two after heavy rain, when storm overflows discharge and rain washes off farmland — including at beaches rated Excellent for the rest of the season. That is the whole reason this page shows you rainfall and discharges alongside the grade.
Porthkidney Sands was rated Excellent for 2025, the highest of the four grades in the Bathing Water Regulations. That grade comes from bacterial samples taken over several seasons, so it describes the beach's record rather than the water on any given day.
The Environment Agency issues a pollution risk forecast each morning during the bathing season for nearly every bathing water in England, and the water company publishes the status of its storm overflows every few minutes.
The rest of its file
What the regulator holds for this place. None of it describes the water today.
- Water
- Estuary
- Area
- Cornwall, England
- Monitored outfalls within 5km
- 5 (nearest 1.9km)
Sea, wind, tide and weather
The sea and the weather here today and for the week ahead. Not the water quality verdict above.
Today
Rain, the week behind and ahead
The weather for the week ahead
Lifeguards
The RNLI has a lifeguard unit at this beach.
They do not patrol all year, and this page cannot tell you whether anyone is on duty today. RNLI page for this beach.
Where it is, and what discharges near it
Directions to this bathing water
That is the Environment Agency’s sampling point, which is at the water rather than at a car park. Your maps app will take you to the nearest road it can reach.
The nearest mapped car park is about 470m away in a straight line. That is not a walking distance: OpenStreetMap knows where the car park is and nothing about the path, which may be longer, steeper or not there at all.
No toilet, drinking water or cafe is mapped within 500m of here in OpenStreetMap. That is a gap in the map as much as it is a fact about the place.
Getting here without a car
- Nearest bus stop Tyringham Road (SE-bound), about 1020m away
- Nearest railway station Lelant Rail Station, 1.1 km away
Straight-line distances to where the stop or station is, from the national registers of them. That a stop exists is not a promise that a bus calls at it — timetables are somebody else’s data and this page does not read them, so check the operator before you rely on it.
The record since 2020
In 2025, the 2 monitored overflows the Environment Agency lists against this bathing water spilled 49 times, for about 475 hours in total. Over the 2025 bathing season alone, 1 May to 30 September, 4 of those spills happened — 8% of the year.
- 202042 spills · 365 hours
- 202145 spills · 426 hours
- 202265 spills · 589 hours
- 202396 spills · 1,383 hours
- 202465 spills · 818 hours
- 202549 spills · 475 hours
These are annual totals for the whole year, not readings from today — today’s answer is the verdict at the top of the page. Figures come from the Environment Agency’s Event Duration Monitoring annual returns, which the water companies submit and the EA publishes, and the EA decides which overflows count as belonging to this bathing water.
What the regulator says about this beach
From the Environment Agency’s published bathing water profile for 2026. It describes the place and its catchment, not today’s water.
The beach itself
Porthkidney Sands is on the north coast of Cornwall. Porthkidney Sands is a large sandy remote beach, approximately 1.3 kilometres wide, backed by sand dunes and cliffs.
What drains into it
The catchment surrounding Porthkidney Sands is approximately 9,750 hectares. The bathing water is at the mouth of the Hayle Estuary. The River Hayle is approximately 19km long rising southwest of Crowan village. It flows west for approximately eight kilometres and through a steep wooded valley north of the granite high ground at Trescowe Common, formerly a mining area. The river turns north near the hamlet of Relubbus, and flows nine and a half kilometres passing St Erth before reaching the Hayle Estuary. Tributaries to the Hayle Estuary include the Nance Stream, the St Erth Stream and the Angarrack Stream, which extend the main river network in the catchment to approximately 42km. The Hayle Estuary encompasses a disused port on the east bank and a substantial area of salt marsh named Lelant Saltings to the west. This is an important habitat for birds and the Royal Society for the Protection of Birds runs a nature reserve there. Much of the estuary is designated as a Site of Special Scientific Interest (SSSI), including the area directly surrounding the bathing water. Land use is mostly arable with improved grassland concentrated in the southeast of the catchment. There is a significant amount of urban area concentrated at the coast including Hayle, Lelant and Connor Downs.
More from the profile
Where the sewage works discharges
Sewage from the Carbis Bay area is pumped to Hayle STW for treatment, and discharges to the sea four and a half kilometres from the bathing water. This discharge is designed to protect bathing water quality.
What has been done about it
The sewage treatment scheme for Penzance and St Ives was completed by South West Water in early 1995. The scheme included extensive sewerage, improvements to intermittent discharges and the removal of untreated sewage discharges. Wastewater from St Ives is pumped to Hayle sewage treatment works (STW), where it receives secondary treatment before its discharge through a 2.7km long sea outfall west of Godrevy Head. The Hayle STW was enlarged and upgraded in 1995 and again in 2000. Storm overflow event duration monitoring (EDM) was installed at the Porthgwidden pumping station and at five intermittent discharges to the Hayle estuary by December 2011.
What the samplers see on the sand
Environment Agency samplers make observations of litter present on the beach at every visit, this includes assessments of sewage debris, litter and tar. At Porthkidney Sands for the four year (2022-2025) assessment period where data is available, sewage debris was not noted at this site. Litter was assessed as being sufficient to be objectionable for 2% of visits, with 58% of visits noting the presence of litter. Tarry residue was not noted at this site.
Published by the Environment Agency under the Open Government Licence. The full profile carries more, including sections repeated for every beach that are not reproduced here.
Other swimming spots nearby
The closest bathing waters on the regulators’ lists, straight-line distance. Each has its own checks and its own verdict.
Check the official source
The regulator’s own page for this bathing water. If it disagrees with this one, believe theirs.
Porthkidney Sands's official page at the Environment Agency · See it on a map
This page is not official. It reads published data and presents it plainly; if a sign at the beach says otherwise, believe the sign.
If you get into trouble
This is the RNLI’s advice, not ours.
Float. Tilt your head back with your ears in the water. Relax and let your breathing settle. Move your hands and legs gently to stay level. Your legs may sink, and that is fine, everyone floats differently. The first shock of cold water passes in less than a minute, so do not try to swim straight away. Once it has passed, call for help or swim to safety.
Caught in a rip current? Do not swim against it, you will only tire yourself out. If you can stand, wade out of it. If the water is too deep to stand, swim parallel to the beach until you are clear of it, then head for shore. Raise your hand and shout for help.
Nobody publishes a rip current forecast for beaches in Britain or Ireland, so this site cannot show you one. The RNLI has one for its own lifeguards. The public does not. Look at the water before you get in, and look for a channel where the waves are not breaking.
In an emergency call 999 and ask for the Coastguard. In the Republic of Ireland call 112 or 999 and ask for the Coast Guard.
Where there are lifeguards, swim between the red and yellow flags. They put those flags where it is safest that day and move them as the sea changes. A red flag means do not go in, whatever this page says. An orange windsock means the wind is blowing offshore and inflatables should stay out of the water. Most places on this site have no lifeguard at all.
This advice is the RNLI’s. Their Float to Live pages are worth two minutes of anyone’s time.
Use this page elsewhere
One sheet of A4 with a QR code to this page, for a clubhouse, a campsite reception, a surf school or a harbour office. The address is printed underneath in words, so it still works for anybody who would rather not scan a code.
Print a sign for Porthkidney SandsOr put today’s verdict on your own site.
Put this beach on your own site
A small card showing today’s verdict for Porthkidney Sands, updating itself. Paste this where you want it to appear. It loads nothing of yours and sets no cookies, and it costs your visitors about ten kilobytes, most of it the readings themselves.
Click the box to select it all. There is also a feed for this beach, if you would rather be told than have to look.