All swimming spots › Cornwall, England
Can I swim at Long Rock?
Cornwall, England · Coastal
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 91 per 100ml, on 28 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.
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.
Long Rock 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 regulator records this as a bathing water whose quality can be affected by heavy rain, which is why rainfall in the last 24 hours is shown above.
The rest of its file
What the regulator holds for this place. None of it describes the water today.
- Water
- Coastal
- Area
- Cornwall, England
- Monitored outfalls within 5km
- 10 (nearest 0.2km)
- Affected by heavy rain
- Yes, per the regulator
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
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 120m away in a straight line (Long Rock). 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. It is tagged as charging a fee, as the mappers wrote it.
What is mapped at this beach
- Dee Dee's Family Café about 380m away
Straight-line distances from OpenStreetMap, not walking distances, and only what volunteers have mapped — something missing here may still be there.
Getting here without a car
- Nearest bus stop Mexico Inn (E-bound), Riverside, about 400m away
- Nearest railway station Penzance Rail Station, 2.0 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 6 monitored overflows the Environment Agency lists against this bathing water spilled 236 times, for about 577 hours in total. Over the 2025 bathing season alone, 1 May to 30 September, 49 of those spills happened — 21% of the year.
- 2020298 spills · 1,077 hours
- 2021261 spills · 874 hours
- 2022251 spills · 556 hours
- 2023254 spills · 552 hours
- 2024246 spills · 559 hours
- 2025236 spills · 577 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
Mounts Bay is on the south coast of Cornwall. There are four designated bathing waters located around the bay - Wherry Town, Penzance, Long Rock and Marazion. All the beaches are sandy resorts backed by sea defences. Heliport beach is approximately one kilometre wide. The Ponsandane Brook flows onto the western end of Heliport beach.
What drains into it
The catchment surrounding Long Rock is approximately 2,315 hectares. There are a number of streams which drain to this part of Mount's Bay. The Chy-an-dour Brook at the western end of the beach is approximately five and a half kilometres long and flows through mining country before skirting the eastern edge of Penzance and entering the bay just east of the harbour. The Trevaylor Stream is approximately seven kilometres long and joins with the Rosemorran Stream to form the Ponsandane Brook (Trevaylor Stream) which passes through the urban area of Trevarrack before entering the bay 400 metres (m) to the west of the Environment Agency monitoring point. A small stream approximately one and a half kilometres long also drains through an underground channel 200m east of the Environment Agency monitoring point. In total the river network in the catchment is approximately 22km including major tributaries. The catchment rises in the moorland close to the northern coast and slopes steeply in the headwaters then fairly gently south to the coast. The catchment is a patchwork of improved and unimproved grassland, arable and heath. The catchment lies within part of the Cornwall Area of Outstanding Natural Beauty (AONB).
More from the profile
Where the sewage works discharges
Sewage from the Penzance area is pumped to Hayle STW for treatment, and discharges to the sea off the North Cornwall coast. This discharge is designed to protect bathing water quality.
What has been done about it
In the past there were a number of private discharges and combined sewer overflows (CSO) that affected this bathing water, as well as the general contamination of Penzance Bay from numerous sources. 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. In 1998, further improvements were also made to CSOs at Long Rock, and Marazion pumping station CSO was sealed in November 2001. Storm overflow event duration monitoring (EDM) was installed at six CSOs in Penzance 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 Long Rock 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 1% of visits, with 48% of visits noting the presence of litter. Tarry residue was not noted at this site.
The council's part
The urban area of Penzance immediately behind the beach is served by a combined (surface and sewer) system.
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.
Long Rock'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 Long RockOr put today’s verdict on your own site.
Put this beach on your own site
A small card showing today’s verdict for Long Rock, 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.