Galway City Council has imposed a ban on swimming at two beaches due to E.coli contamination.
The bacterial contamination was detected during tests at Grattan beach in Lower Salthill and Ballyloughane beach on the city's east side near Renmore.
The samples showed up high levels of E.coli after they were taken from water at the two beaches on Tuesday of this week, the city council says.
It has said this may be due to “suspected contaminated urban runoff” in its public notice.
Heavy rain in the city earlier this week would have released storm drains into the Corrib estuary and out into Galway Bay.
The city council said it took further samples on Wednesday.
It said that it would issue updates on the swimming ban when these test results become available.