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Llyn Padarn

The lake below Snowdon at Llanberis, with the bathing water on its northern shore.

We do not read the water company's overflow data here yet, so storm overflows within 3 km of Llyn Padarn are not shown.

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Lake level
-
Bathing sites
1
1 Excellent
Overflows within 3 km
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Spills nearby, 30 days
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  • Llyn Padarn
  • Excellent or Good
  • Sufficient
  • Poor

Designated bathing sites

Llyn Padarn

Excellent · 2025 Out of season

Latest sample 18 Sep 2026: E. coli 36, enterococci <10 per 100 ml.

11 May E. coli per 100 ml, log scale 18 Sep
Classifications and description

The cleanest samples over the last four seasons.

Past years: 2025 Excellent · 2024 Excellent · 2023 Excellent · 2022 Excellent · 2021 Excellent · 2020 Excellent

The bathing water is located on the western side of Llyn Padarn, which is a fresh water lake in Eryri (Snowdonia). It is located close to the village of Llanberis with its cafes and other tourist attractions. The beach has a shallow slope and then once in the water it gets deep quite quickly – up to 1 metre deep within 1.5 metres of entering the water. The beach is gravelly. Once in the water the substrate consists of gravel and small pieces of slate which turns into stones and larger slates within a metre or two of entering the water. The site has a jetty which was previously used in the London Olympics.

Natural Resources Wales profile

Storm overflows within 3 km

Nearest first, straight-line distance.

We do not read the water company's overflow data here yet, so overflows within 3 km are not shown.