Both Lough Lene and Lough Owell have secured excellent ratings in the EPA's annual report.
Midlands lakes have been given a positive review by the EPA.
The latest Bathing Water Quality report gave both Lough Lene and Lough Owel an 'excellent' rating, while Lough Ennell's bathing water was rated as 'good'.
Esker in Banagher meanwhile was judged to have a generally good quality.
The number of beaches reaching the minimum standard rose by 2% from 2023 while 81% were ranked as "excellent".
96% of beaches across the country are of 'sufficient' quality to swim at.
The number of beaches with a poor bathing water quality ranking dropped from 5 to 2 last year.
Dr Eimear Cotter from the EPA says heavy rainfall is still causing issues:
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