The efficacy of public administration depends upon institutional accountability to guarantee that fiscal appropriations yield substantive socio-economic advancements for grassroots populations. This investigation evaluates the intersections of internal governance oversight, infrastructural project execution, and civic performance appraisals within the Niger Delta Development Commission (NDDC). Shortfalls, such as restricted financial transparency, inadequate project monitoring, and chronic infrastructure abandonment, have severely fractured public confidence, leaving an empirical blind spot regarding accountability-driven service delivery in the region. To address this, data were gathered via structured questionnaires from 350 adult household heads across Delta, Bayelsa, and Rivers States, and evaluated using simple linear regression models. Descriptive findings reveal that current initiatives fail to align with community priorities (53.7%) and lack operational efficiency (53.2%). Statistical analysis confirms that administrative accountability significantly predicts project execution success (R² = 0.64, p = 0.000) and serves as the primary driver of public performance ratings (R² = 0.74, p = 0.000), while project abandonment accounts for 63% of public dissatisfaction (R² = 0.63, p = 0.000). This structural sentiment is verified by a control variable tracking solar streetlights, where 71.7% of respondents rejected the notion that isolated interventions equate to genuine regional development. Ultimately, institutional credibility cannot be sustained through superficial fixes; it depends entirely upon fiscal discipline and completing existing contracts. This study bridges a critical literature gap by linking administrative governance directly to grassroots development. To restore public trust, the NDDC must deploy digital project tracking tools, mandate proactive financial disclosures, and integrate community-driven planning frameworks.