A ban on swimming at the Forty Foot in Dublin was lifted today, however a temporary bathing ban for a number of other areas has been extended.
Dún Laoghaire-Rathdown County Council said the water quality has returned to acceptable levels at the Forty Foot.
However, pending final results of bathing water quality testing from Saturday, swimming bans are still in place for Seapoint, Sandycove, White Rock and Killiney.
The council said a further update will be provided tomorrow with the latest information being made available on its website and via social media.
Separately, Wexford County Council has also advised that a temporary "no swimming" notice has been issued for Duncannon beach.
Recent tests conducted as part of the council's routine bathing water sampling programme showed slightly elevated levels of microbiological contamination at Duncannon beach.
In a statement, the council said that following consultation with the Health Service Executive, it has decided to temporarily prohibit swimming at the popular beach in the interest of public health.
Further water quality samples were taken this morning with the results expected within 48 hours.
It said water quality results for 18 other Wexford beaches have been excellent throughout 2019.
"There is no obvious cause for these recent poor bathing water quality results, though recent spells of heavy rain may have been a contributing factor. The council's technical staff are currently investigating the matter."
It appealed to those visiting Duncannon beach to abide by the "no swimming" ban until it has been removed.
It said regular updates will be issued through local radio, social media and the council's website.