From Soil Test to Final Inspection
— One Crew, One Standard

A new septic system installation puts in place the complete sewage treatment and disposal infrastructure for a home that isn't on municipal sewer. That includes a septic tank (usually 1,000–1,500 gallons for a 3–4 bedroom home), distribution box, and drain field (typically 200–400 feet of perforated pipe in gravel trenches). For challenging sites, systems can include lift pumps, sand filters, or engineered mound beds.

Three scenarios: (1) New construction on a rural lot without municipal sewer access — most common. (2) Complete system replacement when the existing system has failed beyond repair. (3) Adding a second system for an accessory dwelling, in-law suite, or workshop with plumbing. All three need a permit and, in most cases, a licensed installer. South Carolina tiers that licence — Tier 1, Tier 2, and Tier 3 by system type and size — and RO holds Tier 2, the level the state requires for pump systems, large systems, grease traps, and repairs. A Tier 1 installer cannot legally touch that work. North Carolina and Georgia license installers under their own programs, and RO carries all three, so the permit path changes with the address but the crew doesn't.

The soil report writes most of this estimate before we do. A gravity-flow system on well-draining Piedmont soil for a 3–4 bedroom home is the baseline scope: soil test, permit, tank, drain field, labor. Everything above that is the site talking — a slow perc rate in clay, a water table sitting high, rock close to grade, or a lot too tight to hold the required reserve area all push you toward an engineered design (sand filter, mound bed, aerobic treatment) with imported material, a pump, and power run to it. Bedroom count sets tank size and linear feet of field, so a fifth bedroom is not a rounding adjustment. Timeline: soil evaluation and permitting 1–3 weeks, installation 2–5 days, inspection and backfill 1–2 more days — 2–4 weeks start to finish, longer when the spring permit queue backs up. Which queue you're in depends on the address: SCDES reviews it in South Carolina, a county health department does in North Carolina and Georgia, and they don't all move at the same speed.

Soil out here changes lot to lot — sandy Piedmont on one parcel, clay-heavy bottomland on the next, shallow bedrock as you climb toward the foothills. A cookie-cutter system that works on one lot fails on the one beside it. That's the reason South Carolina sizes systems on soil morphology — texture, structure, depth to a restrictive horizon, depth to the seasonal water table — instead of a percolation test, and why above the Fall Line, which covers everything we build in this state, the evaluation has to come out of backhoe pits rather than hand borings. North Carolina and Georgia evaluate and permit onsite systems under their own rules, so the same house plan can end up with a different permitted design depending on which side of the line it lands. Lake lots add a layer on top: Keowee, Jocassee, and Hartwell all carry setbacks from the water, and Hartwell puts South Carolina rules on one shore and Georgia rules on the other. Getting the design right for your specific site is the single biggest factor in how long it lasts. Shortcuts taken at install show up five years later as drain field failure, and by then the fix is a permit and an excavator. RO does it right the first time.