Power BI Development Services maintain data accuracy through standardized dataflows that ensure consistency across reports. They enforce row-level security (RLS) to restrict access to sensitive data, ensuring data integrity. Governance policies are implemented to certify datasets and control dataset usage, minimizing errors. Audit logs and usage analytics track data modifications and user activities. These Power BI development services also comply with industry regulations by encrypting sensitive data and applying masking techniques. By implementing these practices, they ensure that the data used for analytics is both accurate and governed, building trust in the insights generated.