Definition
Aque haustus (also aquae haustus) is a predial servitude from Roman civil law that grants the holder the right to draw water from a fountain, pool, or spring located on another person's land. It is a species of rural servitude — a burden attached to land rather than to a person — that runs with the dominant estate and obliges the servient estate to permit the drawing of water. The right does not convey ownership of the water source itself, only the limited privilege of extraction.
Why It Matters in Research
This is a narrow, historically bounded term. Researchers will encounter it almost exclusively in two contexts: (1) treatises and opinions engaging directly with Roman civil law sources, particularly Justinian's Institutes and the Digest; and (2) American and Louisiana cases or commentary dealing with servitudes in jurisdictions where civil law water rights survived into the common law era.
The key research trap is terminological drift. Modern water law across most U.S. jurisdictions does not use the phrase aque haustus — the underlying concept has been absorbed into broader doctrines of riparian rights, easements for water, or statutory water-use frameworks. A researcher looking for the functional equivalent of this servitude in post-19th-century American sources must translate the Roman category into jurisdiction-specific vocabulary before the search yields useful results.
Louisiana is the critical domestic jurisdiction. Because Louisiana retained a civil law framework for property, including predial servitudes, the concept underlying aque haustus has continued legal vitality there in a way it does not in common law states. Researchers working on Louisiana servitude questions should trace from Roman sources through the Louisiana Civil Code articles on predial servitudes rather than relying on common law easement doctrine.
Researchers should also note that both Black's and Bouvier's cite the same primary sources — Justinian's Institutes 2.3.2 and the Digest 8.3.1.1 — making those texts the authoritative starting point for any doctrinal analysis of the term's original scope. The Digest passage, in particular, situates aquae haustus within a broader taxonomy of water-related servitudes, alongside iter ad aquam (the right of way to reach the water) and aquaeductus (the right to conduct water through pipes or channels). Understanding where aque haustus ends and these neighboring servitudes begin is essential for reading historical sources accurately.
Historical Dictionary Support
Black's Law Dictionary and Bouvier's Law Dictionary are in full agreement on the substance of this term: both define it as a civil law servitude permitting the drawing of water from another's fountain, pool, or spring, and both cite the same Roman sources. There is no meaningful divergence between the two dictionaries, which is itself informative — it signals that the term was received as settled doctrine rather than contested usage.
What neither dictionary does is trace the term's migration (or non-migration) into American common law. Both entries are purely descriptive of the Roman category. Researchers should treat these entries as a point of entry into civil law sources, not as an account of the term's operative status in any specific American jurisdiction. The silence on common law reception is conspicuous and should prompt further research into whether a given jurisdiction has incorporated, translated, or wholly discarded the doctrine.
Bouvier's citation to the Digest contains a slight variation from Black's (Dig. 8.8.1.1 vs. Dig. 8.3.1.1), which appears to be a typographical error in one edition. The correct Digest reference is 8.3.1.1, situating the passage in the title De servitutibus praediorum rusticorum (On the Servitudes of Rural Estates).
Jurisdictional Note
In common law jurisdictions, the concept underlying aque haustus is typically addressed through easement law or, where water rights are governed by statute, entirely displaced by legislative frameworks. Louisiana, as a civil law jurisdiction, retains predial servitude doctrine most closely aligned with the Roman original and is the primary U.S. forum where engagement with this term carries direct doctrinal weight.