"The current SELPA funding model is based on California legislation passed in 1997 (AB 602) that implemented a “census-based” special education funding structure. The formula allocates funding based on a SELPA’s total average daily attendance (ADA), with the remainder distributed based on specific circumstances, rather than on the number of students identified to receive special education services." See https://www.schoolhealthcenters.org/start-up-and-operations/funding/mental-health/selpa/
*Special Education Funding is supplemental to the funding allocated to every student under the State funding model.
About SELPA's - https://www.cde.ca.gov/sp/se/as/caselpas.asp
San Mateo County's Summary of Special Education Funding in 2018-2019: