N.D. Cent. Code § 57-15-48

The governing body of any city by a two-thirds vote may levy a tax annually for snow removal, natural disaster, or other emergency conditions not exceeding the limitation in subsection 9 of section 57-15-10. No city may make this levy after the amount of the unexpended funds raised by this levy plus the amount of money due the fund from outstanding taxes equals the amount produced by a levy of five mills on the taxable valuation of property within the city or five dollars per capita, whichever is greater.