A tax or fee historically charged for the right to use or convey water through property or pipes.
From Latin 'aqua' (water) plus '-age' (a suffix indicating right, tax, or charge, as in 'toll'). Medieval property law created these charges as water infrastructure developed.
Before modern plumbing, landowners who had water crossing their property could charge neighbors a fee—'aquage' was literally how medieval entrepreneurs turned flowing water into a business model.
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