Subsurface / Septic System Design

GRAZ Engineering is experienced in all aspects of subsurface/ septic system design and permitting in both New Hampshire and Massachusetts, with licensed professionals in both states.

• Title-5 Soil Evaluations
• Deep hole testing and percolation testing for individual systems and subdivisions
• NH Site Assessments
• Septic system upgrade and new construction designs
• Gravity pipe and stone septic system designs (bed and trenches)
• Pump system designs
• Pressure-dosing system design
• Innovative/alternative system design
• Presby Environmental system designs
• Infiltrator & Cultec system design
• Installation Inspections
• As-built inspections surveys and plans
• State and local waiver requests for system upgrades