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The EPA HydroNet map contains hydrometric data gathered from Ireland's network of local authority hydrometric stations. Hydrometric data from rivers, lakes, tidal locations and groundwater are collected by a number of organisations across Ireland.

These include the local authorities in conjunction with the Environmental Protection Agency (EPA) , the Office of Public Works, the ESB, Waterways Ireland and the Marine Institute. The EPA is responsible for the maintenance of the register of hydrometric stations in Ireland.

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