This report covers nine special districts—three sanitary districts, two sanitation districts, two community services districts, and two open space districts—which provide wastewater, open space and various other services in Santa Clara County. There are other agencies and cities that provide these services as well within the County but they are not covered as a part of this review. A service review is a State-required comprehensive study of services within a designated geographic area, in this case Santa Clara County. The service review requirement is codified in the Cortese-Knox-Hertzberg Local Government Reorganization Act of 2000 (Government Code §56000 et seq.). Upon adopting the service review determinations, the Commission will update the spheres of influence (SOIs) of these providers in Santa Clara County. This report recommends SOI updates for the special districts for the Commission’s consideration.