WordNet (r) 3.0 (2006):

waterworks
    n 1: a public utility that provides water [syn: water company,
         waterworks]
    2: workplace where water is stored and purified and distributed
       for a community

Moby Thesaurus II by Grady Ward, 1.0:

56 Moby Thesaurus words for "waterworks":
   aqueduct, arroyo, bed, bleachworks, bottling works, brassworks,
   canal, copperworks, creek bed, culvert, donga, dry bed, dye works,
   flume, gasworks, glassworks, gulch, gully, gullyhole, headrace,
   ironworks, irrigation ditch, metalworks, nullah, paper works,
   printworks, race, river bed, riverway, runnel, saltworks,
   scrapworks, sluice, soapworks, spillbox, spillway, starchworks,
   steelworks, stream bed, streamway, swash, swash channel, tailrace,
   tileworks, tryworks, tubeworks, wadi, water carrier, water channel,
   water furrow, water gap, water gate, watercourse, waterway,
   wireworks, works