The following is quoted from a US Forest Service Guideline,
"Minimum Requirements Decision Guide" regarding exceptions to the Wilderness Act:
Management of Recreation
2323.13
Improvements and Nonconforming Facilities and Activities
Provide facilities and improvements only for protection of the wilderness resource. Document and justify conditions for providing facilities and improvements in the forest plan. Install facilities as a last resort only after trying education, other indirect management techniques, or reasonable limitations on use.
2323.13a
Campsites
Human Waste Management.
As a last resort to protect the wilderness resource pit or vault toilet structures may be used.
