25 CFR 167.17: Construction near permanent livestock water developments.

(a) The District Grazing Committee shall regulate the construction of all dwellings, corrals and other structures within one-half mile of Government or Navajo Tribal developed permanent livestock waters such as springs, wells, and charcos or deep reservoirs.

(b) A written authorization from the District Grazing Committee must be secured before any dwellings, corrals, or other structures may be constructed within one-half mile of Government or Navajo Tribal developed springs, wells and charcos or deep reservoirs.

(c) No sewage disposal system shall be authorized to be built which will drain into springs or stream channels in such a manner that it would cause contamination of waters being used for livestock or human consumption.