Montana Code Annotated (MCA) 2001
n TITLE 75. ENVIRONMENTAL PROTECTION
CHAPTER 5. WATER QUALITY
n (29) (a) "State waters" means a body of water,
irrigation system, or drainage system, either surface
or underground.
     (b) The term does not apply to:
     (i) ponds or lagoons used solely for treating,
transporting, or impounding pollutants; or
     (ii) irrigation waters or land application disposal
waters when the waters are used up within the
irrigation or land application disposal system and the
waters are not returned to state waters.