The passage of Proposition 13 in California resulted in a reduction of funds available to support local programs. It is important to assess what is happening in California and to communicate that information to the rest of the nation. Background is presented on the origins of Proposition 13 and its potential effects on publicly funded health services. Specific strategies for monitoring the effects of Proposition 13 on health services are presented, along with types of data to be monitored. Early effects of Proposition 13 include personnel shortages, service reductions, introduction of fees for services, disruption of program continuity, service delays, demoralization of public employees, termination of contracts with community clinics, and drastic reductions in staff and services by special districts.