Sandycove Beach water discoloration as a result of micro-alga

Due to adverse weather conditions during a yellow weather warning event, which saw heavy rainfall in the Dublin area, there was a stormwater overflow from Ringsend Wastewater treatment plant. The stormwater overflow operated in compliance with plant design and regulations, and was fully screened and settled.

Dublin City Council in consultation with the Health Service Executive have put a bathing prohibition notice in place at Dollymount beach as of Monday, June 24, 2019.

Separately, Dún Laoghaire Rathdown County Council, following consultation with the Health Service Executive, also put bathing prohibitions in place for Seapoint, Sandycove, and the Forty Foot. The yellow weather warning rain impacted the pumping station on the West Pier affecting bathing waters around Dún Laoghaire. This is not connected to the stormwater overflow from the Ringsend wastewater treatment plant. Irish Water is liaising with Dún Laoghaire Rathdown County Council on this issue.

Storm water overflows are designed and operated in line with international best practice in order to safeguard public health. Without a storm water overflow, raw sewage could back up in the network during heavy rainfall and could flood homes and businesses.

These notices will remain in place pending testing of the bathing water. This testing will be carried out by Dublin City Council and Dún Laoghaire Rathdown County Council. These tests will take up to 72 hours, due to the nature of the test process, which sees water tested for the presence of bacteria. This is done by allowing test samples to culture under lab conditions for this time period of time.

Sandycove Beach

Dún Laoghaire Rathdown County Council have confirmed that the water discolouration reported today is a result of a micro-alga called Noctiluca scintillans, and not as a result of a stormwater overflow. Full details are available here: https://www.dlrcoco.ie/en/news/general-news-press-releases/bathing-water-quality-update-4pm-june-25

Irish Water regrets the impact this may have on beach users

Dublin

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