From Pikmin Fanon
This article relates to the official games. See Pikipedia's "mud" article for more official information.
Mud The icon used to represent this hazard.

Mud is an environmental hazard taking the form of wet earth. It consists of large pools and can be frozen. Shallow mud can be traversed by all Pikmin types and leaders, though wading through it naturally reduces their speed, and deep mud will cause leaders, and Pikmin that can't float on the surface or fly above it to drown. Some enemies can use mud offensively, and others can submerse themselves in it.

In fanon games

Below this point is where users place their version of mud.

In Pikmin V

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This article or section presents information pertaining to Pikmin V, a fanon game created by En Passant.
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Shallow and deep mud appear in Pikmin V, though deep mud is depicted as especially marshy ground rather than as a pool. They are found predominately in the Sodden Swamp area and its cave, Bog Network. Orange Pikmin are not slowed by and do not sink in mud, and the lack of Ice Pikmin to freeze it makes them, along with Winged Pikmin, the only means of traversing the hazard. Quicksand is a functional variant of deep mud.

In Pikmin: Shipwrecked Stargazers

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Shipwrecked Stargazers
This article or section presents information pertaining to Pikmin: Shipwrecked Stargazers, a fanon game created by CarrotStilts1.
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Mud, in Pikmin: Shipwrecked Stargazers only appears in Grimy Resevoir and Gladiator's Gulch. As in Pikmin 4, all Pikmin that fall into it will begin to drown. Rafts can be used to cross bodies of mud. The Billaborb swims in mud and can spit globs of it at Pikmin to bury them.