The Royal Canal has a number of guardians. Responsibility for the canal and the areas surrounding it belong to numerous bodies.
The above image should hopefully help clarify who is responsible for what aspect of maintenance of the canal. 
If reporting to Waterways Ireland please note that you may also email dublincanals@waterwaysireland.org 
If you wish to report an issue that may require assistance or support from Irish Rail please contact community.liaison@irishrail.ie 
If you would simply like to make an inquiry to our clean up group please email us at info@royalcanalcleanup.com