The Environmental Protection Agency has given Keeldra Lough in south Leitrim an excellent rating for the season in 2015 according to water quality results published earlier this week.
The lake is a popular choice for parents sending children for swimming lessons.
This year it has been given the highest water quality rating and the lake has now been confirmed as open for the coming summer season.
Subscribe or register today to discover more from DonegalLive.ie
Buy the e-paper of the Donegal Democrat, Donegal People's Press, Donegal Post and Inish Times here for instant access to Donegal's premier news titles.
Keep up with the latest news from Donegal with our daily newsletter featuring the most important stories of the day delivered to your inbox every evening at 5pm.