Septic System Installation in Wilmington, NC
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Septic Installation for Wilmington Homes and Commercial Properties
Coastal Septic Solutions installs septic systems for residential and commercial properties. Where a Wilmington property has no public sewer, we can install a new or replacement system. Our family-owned company has been in the septic business for over 20 years and installs throughout New Hanover County.
To speak with our septic team, call 910.271.2008, or ask for a free estimate online. Holding the county's Construction Authorization? Attach it to this page's form.
What Makes a Septic Installation in Wilmington Different
Wilmington is an incorporated city in New Hanover County, and its public sewer comes from the Cape Fear Public Utility Authority (CFPUA). CFPUA says its lines run throughout the City of Wilmington and New Hanover County but some areas are not yet served, so check sewer availability for your lot first. Building permits inside the city come from New Hanover County.
On the USDA soil survey, Wilmington's main soils are Leon sand, Baymeade fine sand, Seagate fine sand and Murville fine sand. USDA describes Leon as poorly drained and very poorly drained, with the water table 6 to 18 inches down for 1 to 4 months in most years. Baymeade is well drained and Seagate moderately well drained or somewhat poorly drained. Murville is very poorly drained, with a seasonal high water table within a foot of the surface from November to May. NC State Extension adds that one lot can hold both suitable and unsuitable soil.
The soil below the drain field does the treating, as NC State Extension explains. Under state rules, a trench in natural ground needs 12 inches or more of natural soil between its bottom and any limiting condition, and pressure dispersal where that bottom is under 18 inches above a soil wetness condition with over six inches of sand or loamy sand between. Advanced pretreatment can lower both figures.
New Hanover is a Coastal Area Management Act county, and its site plan checklist asks for marshes, mean high water lines and CAMA setbacks. State setback minimums are generally 50 feet from tidal waters and marshes and 100 feet from SA waters, measured from the mean high-water mark. Wilmington runs its own floodplain rules, and tanks in areas flooded more often than a 10-year storm must be watertight and stay operable.
New Hanover County Septic Permits: The Office and the Steps
Septic permitting runs through the On-Site Water Protection section of New Hanover County Environmental Health, at 230 Government Center Drive, Suite 140. You apply online in the county's COAST portal. County steps and North Carolina law set the order:
- Application. Apply in COAST with a site plan, survey or plat showing existing and proposed structures measured to the property lines, plus driveways, nearby wells, water or sewer hookups and water features.
- Lot preparation. Flag the corners and lines, bush-hog heavy undergrowth, and mark reference points such as ditches and easements on site and on the plan.
- Lot evaluation. A county Environmental Health specialist, or a licensed soil scientist you hire, checks the site and soil against minimum requirements.
- Improvement Permit (IP). It authorizes use of the site.
- Construction Authorization (CA). Issued after a field investigation, it names the system type. The two permits are sometimes issued together.
- Installation. State law generally requires an installer certified at the level the system calls for.
- Inspection and the Operation Permit (OP). The health department, or an Authorized On-Site Wastewater Evaluator you hire, inspects the open installation; a passing county inspection leads to the OP, allowing occupancy and use.
Septic System Types and Who Decides Which One You Get
On the county route, your Construction Authorization sets the system type after a field investigation. The EPA notes that household size, soil, slope, lot size and nearby sensitive waters all shape the design.
Our team can install whichever type your permit calls for, including:
- Conventional. Wastewater runs from the tank to a trench or bed drain field. NC State Extension names gently sloping, thick, permeable soil over a deep water table as the best setting.
- Conventional with a lift station. We install one if the tank is too far for water to reach the drain lines well, and may add an uphill one for gravity fall.
- Chamber. Wastewater passes into connected chambers and meets the soil inside them. The EPA calls the design well suited to high groundwater.
- Low-pressure pipe (LPP). Small pipes under low pressure spread effluent across the entire drain field.
- Drip distribution. A large dose tank feeds timed doses to drip lines buried 6 to 12 inches deep, and the system needs electrical power.
Request a Free Estimate
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Check out what our customers have to say
Angela Bartlett
Google review
Had an unknown emergency with our septic tank during Hurricane Debby. Tracy quickly confirmed it was an emergency, had the crew out within 1.5 hours. When they got there, they were efficient, informative, professional, & honest. Thank you Tracy, Ej & Josh. I highly recommend.
Candice Thomas
Google review
Coastal Septic Solutions was contracted to fix an issue caused by another company. They were super professional and polite and extremely helpful anytime I needed to call to find out the process and when I would expect or could expect the repairs to take place. The day they arrived everybody was in and out very quickly and took into account that I work from home and managed to keep the noise to a minimum and most of the time I forgot they were even outside my house. Definitely recommend their services.
Cristina horrell
Google review
I contacted Coastal about coming out to take a look at my septic tank lines. I had a issue with roots growing into the lines causing them not to drain properly. When I contacted them they were very understanding and came right out to look at the issues. They corrected the problem and even put out grass seed where they had to dig up the lines!
M
Marysusan Rice
Google review
Our septic tank wasn't draining properly and Jonathan came and assessed the situation quickly that we needed a new drain field. He obtained the necessary permit, all the materials needed were delivered the next day, and he and his crew came the next day. They laid a 55ft drain field, cleaned up the yard and were done by mid afternoon. He and his crew work well together and do a beautiful job!!! They are all very personable and we highly recommend Coastal Septic Solutions for any septic problems. Charles and Marysusan Rice.
D
deb woody
Google review
This company stepped in and installation was perfect. The yard was left in beautiful shape, ready for finishing touches. They were honest, hard-working and great to work with. Strongly recommend coastal septic solutions.
D
Darin Boswell
Google review
Sam and Josh showed up on time and were very polite and knowledgeable with my overload of questions about how the system functions and ways to better maintain our system. They found our tank, inspected the system, cleaned the system out, and cleaned up the area with ease and speed. I highly recommend these guys for your next service. I was able to learn alot also. Thanks and be safe.
Step by Step: What Happens During Your Installation
- Sewer check and permits. Confirm with CFPUA whether sewer is available, then get your septic permits.
- Estimate. Send us the CA by email or through the form on this page, and we return a free estimate for that system.
- Marking the trenches. Before work begins, trench locations are marked with an elevation instrument such as a laser level.
- Setting the tank and field. We place the tank and lay out the field per the CA.
- Open inspection. The installation is inspected before any soil goes back over it.
- Backfill. State rules require settled cover soil at least six inches deep over the field; grass then helps keep it from eroding.
- Operation Permit. The county issues the OP once its inspection finds the system properly installed.
Things That Shape Your Installation Schedule
Several steps outside the installation set the pace:
- Sewer availability. For a building lot, CFPUA answers sewer questions through its Request for Information form; its letter is not approval to connect.
- Site readiness. If corners are unflagged or undergrowth is not cut before the specialist's visit, the county calls or writes.
- Open applications. An application waiting on you expires 12 months after filing.
- Coastal permits. Construction or land clearing in a CAMA Area of Environmental Concern may need a CAMA permit.
- Building permit holds. CFPUA or the City of Wilmington can hold the county building permit.
Septic for New Homes, Replacements and Commercial Buildings
New construction. Electrical, plumbing and other construction permits generally wait for the septic Construction Authorization. A home's minimum tank is generally 1,000 gallons up to four bedrooms and 1,250 at five.
Replacement. Barring a private option, repairing a failing system takes a health department permit, and the county's evaluation uses a Homeowner Interview Form. Most housing sites permitted from the early 1980s on must have a repair area where a second drain field could be built. If CFPUA has granted a connection deferral, a septic failure or county-ordered repair ends it and the owner must connect to sewer.
Commercial. For a business, the application must give the number and function of its design units so the county can set design daily flow and effluent strength.
Coastal Septic Solutions installs septic systems for residential and commercial properties.
Looking After a Newly Installed System
- Request an as-built diagram from your installer; it may show details the permit does not.
- The EPA advises an inspection every three years or sooner; a household tank is typically pumped every 3 to 5 years, a job our septic tank pumping team handles.
- Do not park or drive on the drain field, or build over it without checking with the permitting authority.
- Divert gutters, downspouts and stormwater away from the system.
- Grow native grass or ground cover on the field, and plant trees far enough away to keep roots out.
Reasons to Work With Coastal Septic Solutions
- Family owned, with over 20 years of experience in septic work.
- Licensed and insured.
- Local professionals who understand Wilmington's coastal soil conditions and local standards.
- Coastal Septic Solutions installs septic systems for residential and commercial properties.
- Up-to-date equipment, used to keep each job efficient and each site clean.
- Full transparency: we only advise repairs that are genuinely necessary.
- Prompt responses and practical advice, with every estimate free and no-obligation.
More Septic Services From Our Team
- Septic tank risers. Our risers bring the tank opening flush with the ground or slightly above it. NC State Extension advises one for any tank 6 inches or more below the surface.
- Line jetting. We use high-velocity water jetting to clear stubborn clogs, tree roots and buildup from drain lines.
- Emergency services. We are ready around the clock for backups and septic emergencies in Wilmington.
Communities Near Wilmington We Also Serve
Beyond Wilmington, we work in Myrtle Grove, Porters Neck, Leland, Hampstead, Rocky Point and Currie. Browse our service areas for other towns.
We install new systems throughout New Hanover and Pender counties and in parts of Bladen, Brunswick, Columbus, Duplin, Onslow and Sampson counties, per our new septic installation page.
Common Questions About Septic Installation in Wilmington
Should I check sewer and septic options before buying land in Wilmington?
Yes. CFPUA tells buyers to check water and sewer availability during due diligence, and its existing-structures service map does not cover vacant lots. NC State Extension also says to always obtain an Improvement Permit before purchasing a lot you intend to build on.
Are there private alternatives to the county's septic permits?
State law offers two: the Authorized On-Site Wastewater Evaluator option, run by a licensed soil scientist with added state certification, and the Engineered Option Permit, using a professional engineer. Both still require a Notice of Intent to Construct, submitted to the county health department; the county's Forms page has forms for both.
How long does an Improvement Permit stay valid?
With a plat, an Improvement Permit has no expiration date; one based on a site plan lasts five years. Either way, a change in the plat, site plan or intended use can lead to revocation. A Construction Authorization lasts equally long.
Can a driveway or parking area go over the drain field?
Only with approval. State rules keep initial and repair drain fields out from under impervious surfaces and vehicle traffic unless approved, and NC State Extension advises keeping cars and heavy equipment off the system and planning driveways away from it and the repair area.
What if I want to build an addition or a pool later?
Check with county Environmental Health first; NC State Extension says its authorization makes sure the system and repair area remain intact and properly sized. Another route, for work meeting local and state setbacks without raising design daily flow or wastewater strength, is an owner's affidavit (Appendix H) filed with the building permit application.
Get a Free Estimate for Your Wilmington Septic Installation
Call 910.271.2008 or contact us online for a free estimate. Have your Construction Authorization ready if the county has issued it. If you have not applied yet, call to speak with one of our septic professionals.
