Richard Boyd Barrett TD, People Before Profit Alliance, reveals that Irish Water customer agreement has implications for water harvesting and water conservation by users. See Obligations of Customer, Section 1.9.7, Page 17 of the Irish Water Agreement.

“The Customer shall not allow the discharge of rainwater run-off from roofs, paved areas or other surfaces into any Sewer, except as may otherwise be agreed in advance with Irish Water in writing”

http://www.water.ie/docs/General-Conditions-for-a-Water-and-Wastewater-connection.pdf

Deputy Boyd Barrett also reveals the similarities between the regulations around Irish Water and those of water authorities around the world which ended up being privatised.