Whenever a petition is filed in the district court which:
A. seeks the annexation of territory to a municipality in a class A county;
B. is signed by an owner of land in such territory or by the authorized agent of any local public body;
C. is accompanied by a map which shall show the external boundary of the territory proposed to be annexed and the relationship of such territory to the existing boundary of the municipality;
D. names as respondents the county and the board of county commissioners of the county;
E. states that there exists in such territory a particular hazard to the health of persons residing within or without such territory; and
F. alleges that such hazard would be removed or materially alleviated by such municipality upon annexation, and that no other adequate and speedy remedy for the removal or material alleviation of such hazard is available, the district court shall set a date for a nonjury trial to consider the merits of such petition.