‘Municipal securities’ means notes, warrants, interim debentures, bonds and temporary bonds validly issued as obligations for a purpose related to natural resources which are payable:

1.  From taxes whether or not additionally secured by any municipal revenues available therefor;

2.  For bonds issued by an irrigation district, from assessments against real property;

3.  For bonds issued by a water authority organized as a political subdivision created by cooperative agreement, from revenues of the water system of the water authority or one or more of the water purveyors who are members of the water authority or any combination thereof;

4.  For bonds issued by a wastewater authority, from revenues of the water reclamation system of the wastewater authority or one or more of the municipalities that are members of the wastewater authority, or any combination thereof;

5.  For bonds issued by a flood management authority, from revenues of the flood management authority or one or more of the municipalities that are members of the flood management authority, or any combination thereof; or

6.  For assessment bonds issued by a municipality under chapter 271 of NRS from assessments against real property.