Article 17 (16) of the European Union (Good Agricultural Practice for Protection of Waters) regulations 2014 states that silage bales shall not be stored outside of farmyards within 20m of waters or a drinking water abstraction point in the absence of adequate facilities for the collection and storage of any effluent arising.
The Department of Housing Planning Community and Local Government is the lead Department for these regulations otherwise known as the nitrates regulations. Any breach of these regulations is ultimately an issue for that Department.