By Nara Bakthisaran · Triad Core Builders · September 25, 2026
If your Triad lot has no city sewer, the septic permit is not paperwork you do after you buy the land. It is one of the first things you should check during due diligence — and the county that owns the lot is the office that runs it. Not sure yet whether the lot can connect to city sewer? Start with our guide to city water and sewer vs well and septic.
This guide is the county side of the process: which Environmental Health office to call in Guilford, Forsyth, and Davidson, what they publish for fees, how to pull an old Improvement Permit, and how to show up with the lot ready so you do not pay a revisit fee. For how North Carolina soil evaluations work and what system types cost to install, see our perc test and septic systems guide. New to the term? Read what a perc test is.
Quick answer: Every new septic system in North Carolina needs an Improvement Permit, then a Construction Authorization, then an Operation Permit after install. Under state law an Improvement Permit based on a site plan is valid for five years, and one based on a surveyor's plat does not expire; either can transfer with the land if the lot and design do not change. Before you close, ask the seller and the county whether a live IP already exists. Fees and forms differ by county — the numbers below come from each county's published schedule and should be confirmed before you pay.
The three permits (same statewide, different county desks)
North Carolina's on-site wastewater rules (15A NCAC 18E) run the same sequence in every county:
- Improvement Permit (IP) — soil and site evaluation. Says whether the lot can support a system and what type. Valid for five years when issued on a site plan, or without expiration when issued on a plat (G.S. 130A-335(f)). Transfers with the land when boundaries and design stay the same.
- Construction Authorization (CA / ATC) — design review that lets a certified installer put the system in the ground. You cannot legally install without it.
- Operation Permit (OP) — issued after the county inspects the finished install.
The soil science and system-cost side lives in the perc post. What changes by county is the application form, the fee table, the queue, and how you look up old records.
Guilford County
Office: Guilford County Environmental Health — On-site Wastewater Phone listed by the county: 336-641-7613 (the On-site Wastewater page lists this line, 8–10 a.m., for system type and location information on file) Forms: Environmental Health Forms (Septic/Water Quality section, including the Authorized Agent Form — call Environmental Health for the current Improvement Permit application) Program page: On-site Wastewater Fee schedule: Guilford Environmental Health Fee Schedule
Published on-site wastewater fees (confirm on the county page before you pay):
| Service | Published fee |
|---|---|
| Residential soil evaluation | $100 per bedroom |
| Authorization to Construct (type I & II) | $100 |
| Authorization to Construct (type IIIb) | $140 |
| Alternative Construction Authorization (type IV, V & VI) | $450 |
| Alternative design | $550 |
So a three-bedroom residential soil evaluation is listed at $300 before any Construction Authorization fee. Guilford also publishes a Soil New Health Residential (SNHR) permit-timeframes dashboard on the On-site Wastewater page — use that for current wait times instead of guessing from word of mouth.
Guilford's subdivision plat guidance notes that Improvement Permits for approved lots are valid for five years. If you are buying a lot that already went through Environmental Health for a plat, ask whether an IP was issued and whether it is still valid.
Forsyth County
Office: Forsyth County Environmental Health (Wastewater / Septic) Address listed by the county: 799 North Highland Avenue, Winston-Salem, NC 27101 Phone listed by the county: 336-703-3225 New construction page: Forsyth New Construction (septic) Wait times: Forsyth's Environmental Health page links an On-Site Water and Wastewater Application Wait Times dashboard — check it before you plan closing dates around a soil evaluation.
On Forsyth's New Construction page, the soil/site evaluation is the first step for a lot without public sewer. The application must be signed by the property owner or a designated authorized agent. When the permit is ready, the specialist contacts the owner or agent to pick it up, sign, and pay remaining fees.
Published fees from Forsyth's On-Site Water and Wastewater Service Invoice (linked from the Environmental Health page; they match the county's FY24-25 fee schedule — confirm before you pay):
| Service | Published fee |
|---|---|
| Soil/site application (3–6 bedroom house) | $232 |
| Soil/site application (100–1,500 GPD: business, church, or 7+ bedrooms) | $489 |
| Revisit | $64 |
| Redraw | $43 |
| Construction authorization (conventional or alternative, gravity, new) | $265 |
| LPP system | $362 |
| T&J Panel new system | $349 |
| Additional for any pump installation (new only) | $71 |
Forsyth is clear that incomplete site prep means the specialist cannot finish the evaluation and you pay the revisit fee. Mark property corners, proposed house corners, and anything else the checklist asks for before the visit.
If the lot already has a septic system and you only need a building permit for an addition, deck, pool, or outbuilding, Forsyth requires a Health Department Release first (Additions page). That is a different path from a brand-new IP.
Davidson County
Office: Davidson County Environmental Health — On-Site Water Protection Phone listed by the county: 336-242-2310 Program page: On-Site Water Protection Online applications: Davidson OpenGov Environmental Health portal Records: Septic Records Request (electronic form linked from Environmental Health) Fee schedule: Davidson 25-26 Environmental Health Fee Schedule Permitting instructions: Davidson Septic Tank Permit Application Instructions
Davidson spells out the same statewide logic in plain language: an Improvement Permit tells you whether the site can be approved for a septic system. It is not permission to install or to pull a building permit. The Construction Authorization is the install document, and you can file it with the IP or later — if you plan to build within five years, Davidson says to file both together.
Published fees from Davidson's Environmental Health fee schedule (effective July 1, 2025; confirm before you pay):
| Service | Published fee |
|---|---|
| Improvement Permit only (100–600 GPD, 1–5 bedrooms) | $350 |
| Improvement Permit only (601–1,500 GPD, 6–12 bedrooms) | $500 |
| Improvement Permit only (over 1,500 GPD) | $800 |
| Improvement Permit + Construction Authorization filed together (100–600 GPD) | $550 |
| Construction Authorization filed separately from the IP (100–600 GPD) | $290 |
| Return visit (1st / 2nd / 3rd+) | $50 / $100 / $200 |
Davidson also lists private-option (EOP / AOWE) filing fees on the same schedule if you use an Authorized On-Site Wastewater Evaluator instead of waiting exclusively in the county queue. Applications and fees are described as valid for one year from submission, with a 60-day reinstatement window if they expire — read the current instructions before you assume a pause will keep your place in line.
Site prep on Davidson lots is specific: stake all property corners (expose and flag the irons, and flag the lines on parcels over an acre), stake the house footprint including decks, porches, patios, garages, outbuildings, and pools, and clear excessive underbrush so the specialist can evaluate and lay out the system. Davidson treats the site as ready when you submit the application unless you note otherwise, and evaluations run first-come, first-served — so prep the lot before you apply or you will pay the return-visit fee. Anywhere in the Triad, call 811 to mark utilities, and do not grade or excavate before the soil evaluation — you can damage the site.
How to pull old septic records before you close
A live Improvement Permit on the parcel is often worth more than a pretty listing photo. Ask the seller first. Then ask the county:
- Guilford: Start with Environmental Health / On-site Wastewater (336-641-7613). Ask whether an IP was issued for the PIN or plat, when it was issued, and whether it is still valid.
- Forsyth: Call Environmental Health at 336-703-3225 and ask for records on the parcel. Bring the PIN, address, and any prior owner name you have.
- Davidson: Use the county's electronic Septic Records Request form linked from Environmental Health.
What you want in hand:
- Whether an Improvement Permit exists, its issue date, and the validity period printed on it
- System type and design flow (bedroom / GPD count)
- Location of the initial drainfield and the required repair area
- Whether a Construction Authorization or Operation Permit followed
If the IP is current and matches the house you intend to build, you have already cleared the biggest septic unknown. If bedrooms or footprint grow past what the IP allows, you are back in evaluation — better to learn that during your due-diligence window than after closing. Our lot buildability checklist covers the rest of what to verify alongside septic. If the lot has no city water either, our well permits guide covers the county well permit, published fees, and well-to-septic setbacks.
Timing: when to apply relative to closing and the build
On a land purchase contract, the due-diligence period is usually measured in days, not months. The soil evaluation is often the longest county queue on a raw lot, so start it early — the same week you go under contract if the lot has no sewer and no live IP.
On a build you already own, we start the septic conversation at the free site evaluation, before final plans are locked. That keeps the permit clock running while design finishes, which is what keeps a Triad build from sitting idle waiting on Environmental Health. See the build timeline guide for where septic sits against the rest of the schedule.
Fees above are county permit fees only. They are not the cost of installing the tank and drainfield. Installation pricing still depends on soil group and system type — that table is in the perc / septic guide.
What I check on a free site walk
When we walk a Guilford, Forsyth, or Davidson lot for a free site evaluation, septic is on the list with access, utilities, flood zone, and setbacks:
- City sewer available to the parcel, or septic required?
- Existing IP on file, and does it match the planned bedroom count?
- Enough room for the initial field and the repair area inside setbacks?
- Which county desk and which published fee path apply?
If the lot works, you get an all-in price that already includes the septic path the soil is pointing toward. If it does not, you learn that before you are stuck with the land.
Request a free site evaluation — no charge for the look. Or call 336-509-2640.
FAQ
How long is a septic Improvement Permit good for in North Carolina?
Under G.S. 130A-335(f), an Improvement Permit issued on a site plan is valid for five years, and one issued on a surveyor's plat is valid without expiration. Either can transfer with the land when the lot boundaries and design stay the same. The validity period is printed on the permit — confirm it and the issue date with the county before you treat an old paper copy as current.
Do I need a septic permit if the lot already has city sewer?
No. Municipal sewer replaces the on-site wastewater path. Confirm the main is actually available to your parcel with the city — "sewer nearby" and "sewer tap available" are not always the same thing.
Can you put a pool on a lot with a septic system in NC?
Usually yes, but not on top of the drain field or the repair area the Improvement Permit reserves for a future replacement field. Plan the pool before the site evaluation: Davidson asks you to stake pools with the house footprint. On a lot that already has septic, Forsyth requires a Health Department Release before it issues the pool's building permit.
Can I apply for the Improvement Permit before I own the land?
Usually yes, with the owner's signature or a signed authorized-agent form. During a purchase, make the soil evaluation part of due diligence and get the owner or agent to authorize the application so the county will schedule the visit.
What happens if the county says the site is not ready?
Counties charge revisit fees when property lines, proposed house corners, or clearings are not prepared. Forsyth and Davidson both publish revisit fees for that. Stake what the application checklist asks for, and call if the lot will not be ready on the date you listed.
Is a soil evaluation the same as a perc test?
People still say perc test. North Carolina evaluates soil morphology (profile, texture, wetness, available space) rather than a traditional water-timing perc. Details are in our perc test guide.
Who installs the system after the Construction Authorization?
A contractor certified by the North Carolina On-Site Wastewater Contractors and Inspectors Certification Board. Homeowner self-installs are not legal for these systems.
Nara Bakthisaran · Triad Core Builders · NC Licensed General Contractor L.99646 · Building in Guilford, Forsyth, Davidson & Randolph Counties