You should not swim for 48 hours after any heavy rain. Heavy rain can wash pollution into rivers, lakes and our seas and in some instances overwhelm sewage systems giving rise to the operation of storm overflows. The impacts of these events are generally very short-lived lasting typically 1 or 2 days. Swimming after heavy rainfall is best avoided as it carries an added risk of pollution. Learn more: www.beaches.ie/protect-your-health-with-the-48-hour-rule/