Bathing Water Quality Update (4pm June 25)

Tuesday, June 25, 2019
dlr County
Intro Text 

Dún Laoghaire-Rathdown County Council Water Quality Update 1600 June 25

Further to reports in media and social media about orange water at Sandycove Beach and immediate surrounds today, we have taken samples of the orange coloured water at Sandycove this morning. Results this afternoon show that this is not raw sewerage but is a micro-alga called Noctiluca scintillans. This is a benign, non-toxic, species - the ‘blooms’ are characteristically yellow, orange or orange/red.

The appearance of this algal bloom is not directly associated with the waste water overflows associated with the temporary bathing prohibition. We have been advised that this is a natural  summer phenomenon in response to long day length, high nutrients and warm water. These blooms have been reported along the east coast  for the past few weeks and are typical for this time of the year. The algal bloom exhibits bioluminescence, blue sparkles of light emitted when disturbed by waves on the shore or in the wake of a boat, hence the name Noctiluca, or Night Light.

We will be providing further updates on water quality tests at Seapoint, Sandycove Beach & the Forty Foot as soon as they are available.