Supreme Court of the United States

Summary

Supreme Court of the United States Mississippi v. Tennessee (2021)

For these reasons, we hold that the waters of the Middle Claiborne Aquifer are subject to the judicial remedy of equitable apportionment.
B
Mississippi contends that it has sovereign ownership of all groundwater beneath its surface, so equitable apportionment ought not apply. We see things differently. It is certainly true that “each State has full jurisdiction over the lands within its borders, including the beds of streams and other waters.”
Source: Wikisource

Supreme Court of the United States Mississippi v. Tennessee (2021)

Although our past cases have generally concerned streams and rivers, we see no basis for a different result in the context of the Middle Claiborne Aquifer. When a water resource is shared between several States, each one “has an interest which should be respected by the other.” Wyoming v. Colorado, 259 U. S., at 466. Mississippi’s ownership approach would allow an upstream State to completely cut off flow to a downstream one, a result contrary to our equitable apportionment jurisprudence.
Source: Wikisource

Supreme Court of the United States Mississippi v. Tennessee (2021)

To the extent Tarrant stands for the broader proposition that one State may not physically enter another to take water in the absence of an express agreement, that principle is not implicated here. The parties have stipulated that all of Tennessee’s wells are drilled straight down and do not cross the Mississippi–Tennessee border. See Joint Statement of Stipulated and Contested Facts 106. When Tennessee pumps groundwater, it is pumping water located within its own territory.
Source: Wikisource

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