The Public Finance Management, Act 2012 stipulates the roles and responsibilities of the County Treasuries. The main mandate is to manage and control expenditure, collect and manage  local revenue ,keep county  Asset register and undertake financial audit and reporting. It also manages leadership in development and implementation of financial and economic policies; and monitor, evaluate and oversee management of public
finances. The County Treasury function is coordinated through the five technical departments each headed by a director:

1. Revenue Mobilization;
2. Accounting Services;
3. Budget and Economic
4. Planning; Internal Audit
5. Procurement.

Functions
1. REVENUE MOBILIZATION

• Automation of revenue collection system and continuous improvements;
• Coordination of revenue enforcement and compliance with county revenue laws and regulations
• Preparation of the county Finance Bill and coordination for enactment
• Development of revenue administration legislation
• Own Source Revenue (OSR) collection

2. ACCOUNTING SERVICES 

Preparation and presentation of timely annual financial reports and statements to various

government agencies

• Preparation of cash plans
• Accounts reconciliation
• Cash flow projections
• Payments (Receivable and payables)

3. BUDGET AND ECONOMIC PLANNING
The department coordinates its mandate through various units/ sections, ie Economic planning, budget and monitoring and evaluation. Specific roles include:

a. Budget Formulation and Coordination

• Coordinate development of sectoral budget estimates
• Preparation of county annual budgets estimates and requisite supplementary estimates
• Coordinate formulation of County Budget Review and Outlook Paper
• Formulation of County Fiscal Strategy Paper
• Preparation of Budget Implementation Review Reports

b. Economic Planning

• Preparation of County Integrated Development Planning and Annual Development Plans
• Coordinate review of Annual, Mid Term and End Term review of the CIDP and ADP
• Coordinate preparation of county sector plans
• Coordinate public participation in the process of policy development
• Undertake economic forecasting on various sectoral aspects
• Provide technical support in project identification and appraisal; development of sectoral programs
• Development of project/ program funding proposals
• Provide leadership and technical support in development of county policies
• Organize capacity building and training of staff in Policy formulation

c. County Statistics

• Collection and analysis of County Statistics
• Preparation of County Statistical Abstract
• Custodian of County Statistics

d. County Monitoring and Evaluation

• Coordinate monitoring and evaluation in the county
• Formulation of county M&E plan and implementation framework
• Coordinate preparation of County Quarterly and Annual Progress reports
• Ensure institutionalization of M&E culture in the Departments
• Implementation of e-CIMES through integration of county plans, budgets into the automated system
• Capacity building/training of county on M&E

4. SUPPLY CHAIN MANAGEMENT

• Preparation of the annual procurement plan and subsequent revisions
• Facilitated procurement of goods, services and works
• Implementation of e-Procurement and regular training

6. INTERNAL AUDIT

• Conduct audit activities on sectoral aspects: Local revenue streams, Recurrent expenditure, Development Expenditure;
• Audit activities on County Funds
• Audit activities on grants by development partners and national government
• Formulate Audit Committee Annual Reports

7. ICT

To support the mission of CGN through the provision of;

• Data Centre & Blade Servers services
• Software Development/Acquisition
• Network Infrastructure (LAN/WAN, Telephony)
• Hardware Acquisition and Maintenance
• Web design and Maintenance(Intranet and Internet)
• End User Support
• Information Security
• Business Continuity (Backup, Disaster Recovery)
• End User Training and ICT skills capacity development
• Collaboration between the County and other stakeholders
• Encourage innovations in technology development, use of technology, systems, and general workflows within the County;
• Promote Information sharing, transparency, and accountability within CGN and towards the general public;
• Promote efficient communication among County staff and stakeholders
• Ensure that ICT facilities are fully accessible to users with special needs