This report examines transparency and accountability in California’s regional center system, which provides services and supports to individuals with substantial intellectual and developmental disabilities (I/DD). First, to explore existing levels of systemic transparency, we consider different institutional actors’ compliance with statutes that mandate the disclosure of information to government and nonprofit entities; statutes that require disclosures to the public on internet websites; and statutes that mandate disclosures to the public upon request. Second, we assess the adequacy of current accountability provisions that empower individuals and institutions, respectively, to enforce the provisions of state law.  Finally, we propose a number of reforms that we believe could improve overall levels of transparency and accountability in the regional center system, thus helping to safeguard the Lanterman Act’s historic legacy.