What is an SID?

SID stands for Sanitary and Improvement District. It is a local government subdivision with limited powers.  The laws by which SIDs are formed and governed are unique to Nebraska. The owner of real estate that is not located within the boundaries of a city or other municipality who wants to develop the property will form the SID which constructs and maintains the public improvements located within residential, commercial and industrial developments and subdivisions, including the streets, sanitary sewers, water systems, other utility services, sidewalks and parks. The SID issues tax-free warrants and bonds to pay for the public improvements, which are purchased by investors. The warrants and bonds are paid through the special assessments and general taxes levied by the SID on the property benefited by the public improvements.   
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What is a home owners' association?

An organization in a subdivision, planned community or condominium that makes and enforces rules and regulations for the properties in its jurisdiction. HOAs also collect monthly or annual dues to pay for shared expenses, upkeep of common areas and can levy special assessments on homeowners when the association lacks sufficient reserves to pay for unexpected repairs. 

Homeowners associations can also have significant legal power over the property owners in their jurisdiction. They can place a lien on a property if a homeowner falls behind on his dues, for example.