It covers the municipalities of Delft, Midden-Delfland and The Hague, and is fully located in the province of South Holland.

Its main activities are The organization is led by a general board called "verenigde vergadering", consisting of 30 representatives which are representatives of the inhabitants (21 by direct elections), industry (4), owners of open land (mainly farmers) (4) and owners of nature (1).

The present constitution is:[4] The inhabitants parties of VVD, AWP, CDA and Water Natuurlijk together with the representatives of Land and Industry together form the governing coalition.

Later occupants were Philips, Count of Hohenlohe who was married to Maria of Nassau, a daughter of Willem of Orange.

The main entrance to the Delfland Water Board is now situated on the Phoenixstraat where more recently buildings been added on.