On February 3, 1999, the City Council adopted Landscape Maintenance District No. 1 for Tract 28765 (Beazer Homes) comprised of 67 lots. The District was formed to maintain landscaping along the River Road frontage of the tract.

On January 27, 2000, the City Council adopted Landscape Maintenance District No. 2 for Tract No. 25799 (Western Pacific) comprised of 219 assessable lots. The District was formed to maintain landscaping along Norco Hills Road and Hidden Valley Parkway. The District also maintains selected interior slopes, wetlands, equestrian trails, and Norco Hills Park.

On June 6, 2001, the City Council adopted Landscape Maintenance District No. 3 for Tract 28626 (Centex) comprised of 82 lots. The District was formed to maintain landscaping along Norco Hills Road and certain designated slopes within the District as well as all equestrian trails in the development. 

On October 2, 2002, the City Council adopted Landscape Maintenance District No. 4 for Tracts 29588 and 29589 (Norco Ridge Ranch) comprised of 557 single-family developed lots, of which 25 lots are receiving only trail maintenance benefits and five other undeveloped lots, for a total of 562 assessable lots. The District was formed to maintain landscaping within certain slopes, irrigated and non-irrigated, fuel modification areas, parkway landscaping, equestrian trails, natural open space, wetlands area, and Ridge Ranch Park. 

On January 7, 2004, the City Council adopted Landscape District No. 5 for Tract 30230 (Hawks Crest) comprised of 50 lots. The District was formed to maintain certain exterior slopes, parkway landscaping, equestrian trails, two park lots, and Hawks Crest Park.