Official sources checked August 29, 2026

Union County, North Carolina septic permits and requirements

North Carolina state and local framework

The N.C. Division of Public Health On-Site Water Protection Branch provides statewide regulatory oversight and technical guidance for subsurface onsite wastewater systems, while local health departments carry out county permitting and inspection functions. NCDHHS directs homeowners to the local health department for septic questions, permits, and inspections.

County program performs design, permitting, inspection, and repairs

Union County states that its On-site Water Protection Program performs soil and site evaluations, designs and permits new septic systems, inspects installations, and handles permitting for repairs to existing systems.

Applicant must arrange a backhoe for new-system evaluation

After an application is processed and the fee is paid, Union County schedules the soil/site evaluation. For new-system evaluations, the property owner or applicant is responsible for having a backhoe and operator onsite for the scheduled evaluation.

Construction Authorization is required before installation and building permit

Union County states that a Construction Authorization is required to install septic-system components and to obtain the building permit. Depending on the soil evaluation and application type, additional information may be required before the authorization is issued.

Existing-system inspection before new construction

Union County requires an existing-system inspection before new construction on property served by septic, including projects such as garages, decks, swimming pools, irrigation systems, and additions.

Three-acre evaluation limit for Improvement Permit applications

Union County publishes a maximum evaluation area of three acres per Improvement Permit/site-evaluation application and maintains separate local fees by permit and system category.

Official sources

• NCDHHS — On-Site Wastewater Program
• NCDHHS — On-Site Water Protection Branch
• NCDHHS — Homeowner septic permits and inspections guidance
• Union County — On-site Wastewater Disposal (Septic) Systems
• Union County — Environmental Health Fees
• Union County — Environmental Health

SepticScope summarizes public-agency information for planning purposes. The permitting agency's current instructions control if they differ from this guide.