Where can you find information on the sea water quality in Katwijk?
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Up-to-date information on the bathing water quality at Katwijk is available on zwemwater.nl.
- Status: good (safe to swim), warning (swimming allowed, possible health risk), negative swimming advice and swimming ban.
- Bathing season: from 1 May to 1 October the province measures the quality at the official bathing sites.
- Out of season: there are no measurements; you decide for yourself whether swimming is safe.

However, at a temperature lower than 18°C and/or rainfall free-running dogs are allowed on the