Reviewed by Cindy Henderson, PE, PWS
Cypress has an office in Mobile, at 150 Government Street. We delineate wetlands and streams across Alabama, from Mobile and Baldwin Counties to the Tennessee Valley, and prepare the reports the U.S. Army Corps of Engineers (USACE) uses to verify a boundary or issue a jurisdictional determination (JD). This page covers what’s specific to Alabama: which Corps district reviews your site, the state agencies involved, the landscapes that drive most boundary calls, and what drives the cost. For how a delineation works step by step, see our wetland delineation services page.
Which Corps district reviews an Alabama site
Two Corps districts share Alabama, split along the divide between the Tennessee River and the rivers that drain to the Gulf. Based on the USACE Regulatory Areas of Responsibility data, overlaid on county lines:
- Mobile District (CESAM) covers about 87 percent of the state: every basin that drains to Mobile Bay (the Tombigbee, Black Warrior, Cahaba, Alabama, Coosa, and Tallapoosa Rivers and the Mobile-Tensaw Delta), plus the Chattahoochee, Choctawhatchee, Conecuh-Escambia, Perdido, and other coastal drainages.
- Nashville District (CELRN) covers about 13 percent, the Tennessee River drainage of north Alabama: all of Lauderdale, Colbert, Limestone, Madison, Jackson, and Morgan Counties, most of Lawrence, Franklin, Marshall, and DeKalb, and narrow strips of Blount, Cullman, Etowah, Marion, and Winston.
Because the line follows a ridge, a large tract in Marshall, DeKalb, or Lawrence County can drain to both. We confirm the district from the parcel’s drainage during the desktop review, before fieldwork starts, so the report is formatted for the right office. ADEM’s Section 401 program follows the same line.
State and federal agencies: ADEM, ADCNR, and TVA
The Corps decides federal jurisdiction and issues Section 404 permits. In Alabama, three other agencies come up most often.
ADEM Section 401 water quality certification. The Alabama Department of Environmental Management (ADEM) certifies permits from both Corps districts. ADEM issued conditioned certifications for the 2026 Nationwide Permits on December 4, 2025, so those conditions travel with any NWP used in Alabama. A project that needs an Individual Permit gets a project-specific certification, requested through a joint Corps-ADEM public notice. ADEM’s Mobile Branch handles certifications in Mobile, Baldwin, and Washington Counties.
ADEM coastal permits in Mobile and Baldwin Counties. The Alabama Coastal Area Management Program is managed by the Alabama Department of Conservation and Natural Resources (ADCNR) State Lands Division, and ADEM handles the permitting. The coastal area is the land and water seaward of the continuous 10-foot contour in Mobile and Baldwin Counties, so large parts of both counties lie outside it. Inside it, a Corps permit needs ADEM’s coastal consistency decision. New commercial and residential developments larger than five acres that contain areas which are or could be delineated as wetlands, adjoin coastal waters, or are crossed by the coastal construction control line need an ADEM permit even without a federal one, and the application includes a survey by an Alabama-licensed land surveyor showing the delineated wetlands (ADEM Admin. Code r. 335-8-2-.11). See our coastal zone consistency page.
ADCNR state water bottoms. Piers, bulkheads, and other work on state-owned submerged lands need ADCNR State Lands Division authorization, separate from the Corps permit. See dock and pier permitting.
TVA Section 26a. In the Tennessee Valley, the Tennessee Valley Authority must approve fills, culverts, bridges, shoreline stabilization, and other obstructions along or in the Tennessee River and its tributaries (18 CFR Part 1304). TVA won’t issue a 26a permit until the Section 401 certification is obtained or waived.
For a side-by-side look at state certification and coastal permits across our service area, see 401 Water Quality Certification and Coastal Permits: MS, AL, LA, and FL Compared.
Alabama landscapes and what they mean for the boundary
Alabama spans two regional supplements to the 1987 Corps manual. South of the Fall Line, which crosses the state from the Phenix City area west through Tuscaloosa, the Atlantic and Gulf Coastal Plain Regional Supplement applies. North of it, the Eastern Mountains and Piedmont Regional Supplement applies. The two use different data forms and partly different indicators, so we settle the supplement before fieldwork and confirm it with the district near the boundary. Five landscapes account for most of the hard calls.
Wet pine savannas and flatwoods. Near the coast, fire-maintained savannas, pitcher plant bogs, and flatwood depressions can dry out completely in late spring and summer, when upland plants can dominate, so soils and hydrology often carry more weight than the plant list. Bedded pine plantations add another layer: bedding reshapes the surface, and the line is drawn on what the site would show under normal circumstances.
Black Belt clays. Shrink-swell clays over chalk and marl have thick dark surfaces that hide redoximorphic features. The Coastal Plain supplement allows indicator F18 (Reduced Vertic) as a problem-soil approach where these soils occur, and ponded depressions perched on clay can lack hydric soil indicators, so close calls may need a wet-season visit or monitoring.
River floodplains and the Mobile-Tensaw Delta. Bottomland forests along the Mobile, Tensaw, Tombigbee, Alabama, and Tennessee Rivers can go months without surface water, so the delineator relies on soil profiles, drainage patterns, water marks, and drift lines to place the boundary.
Tidal marsh along Mobile Bay. Needlerush and cordgrass marsh grades into maritime forest along the bay and its tidal creeks. The Corps’ Section 10 limit in tidal waters is the mean high water line, and ADCNR’s submerged-lands rule places new bulkheads at or landward of the mean high tide line, so the report has to address each line the reviewing agencies use. Where the shoreline is eroding, those lines move, and an older survey may no longer match the ground.
Tennessee Valley and plateau uplands. Karst sinkholes, spring runs, escarpment seeps, and steep headwater channels are the common problems. Whether each channel is ephemeral, intermittent, or perennial drives both jurisdiction and stream mitigation.
Jurisdiction after Sackett in Alabama
Alabama is one of the states where the 2023 federal rule is enjoined, so jurisdiction is decided under the pre-2015 regulations as narrowed by Sackett v. EPA (2023). A wetland qualifies only where it abuts a relatively permanent jurisdictional water with a continuous surface connection. In practice, flatwood, prairie, and sinkhole depressions separated from streams by upland, and ephemeral channels, are the features most likely to be found non-jurisdictional. An approved JD is often worth requesting when that answer would change the site plan or a purchase decision. EPA and the Army proposed a new definition on November 20, 2025, and supplemented it on September 9, 2026; it isn’t final. For more detail on what the ruling changed, see our explainer on the Sackett v. EPA ruling. More on JDs in What Is a Jurisdictional Determination?
In the coastal area, a non-jurisdictional finding doesn’t end state review. ADEM’s coastal rules define wetlands by the Corps delineation manual, not by federal jurisdiction, and allow filling of non-adjacent wetlands only where no feasible alternative avoids them and ADEM finds they have limited functional value (ADEM Admin. Code r. 335-8-2-.02(3)). Inland, state wetland review generally comes through Section 401 certification, which attaches only when a federal permit is required. See isolated wetlands.
What drives the cost of a wetland delineation in Alabama
Every site is priced on its own conditions. The drivers we see most often in Alabama:
- Acreage and shape. Long corridors, such as roads, pipelines, and rail lines, take more field time than a compact parcel of the same size.
- Vegetation and access. Open, recently burned savanna is quick to walk. Titi and gallberry thickets, Delta bottomlands, and tidal marsh slow the crew down and may need boats or ATVs.
- Soils and land use history. Black Belt clays, bedded plantations, ditched farmland, and old fill need more sample points to support the line, and sometimes a return visit in the wet season.
- Season. Savannas and bottomlands are easiest to read during the growing season, and droughts or high water can add field days.
- Agency path. A site seaward of the 10-foot contour in Mobile or Baldwin County, a Tennessee Valley site that also needs TVA review, or a tract that straddles the Mobile and Nashville Districts takes more coordination.
- Corps verification and survey. A Corps site visit, a JD request, or tying the line to a licensed survey, which ADEM requires for larger coastal developments, all add effort.
The Corps doesn’t charge a fee to verify a delineation or issue a JD. Agency fees come later, with permits.
When the delineation leads to a permit
If wetlands can’t be avoided, the delineation becomes the base for the permit. Smaller impacts often fit a Nationwide Permit; the current NWPs run from March 15, 2026, to March 15, 2031. Inside the Alabama coastal area, ADEM denied coastal consistency for a list of NWPs that includes residential (NWP 29) and commercial and institutional (NWP 39) developments, so those projects need individual review there. Larger projects need an Individual Permit (see What Is a 404 Permit?).
Most permits that involve wetland or stream fill also need compensatory mitigation. The Mobile District calculates stream debits and credits with its Compensatory Stream Mitigation Standard Operating Procedures; north Alabama sites in the Nashville District use a different method, so confirm it at the pre-application meeting. In the coastal area, ADEM approves its own mitigation plan. See mitigation banking and buying credits or establishing your own bank.
A Corps permit also brings Endangered Species Act consultation into the schedule. The gopher tortoise is federally threatened west of the Mobile and Tombigbee Rivers, and Alabama’s streams carry many federally listed mussels, snails, and fishes. Our gopher tortoise survey page covers survey scope.
Cypress wetland projects in Alabama
- CN (Canadian National) rail corridor, Mobile, Alabama, to Jackson, Mississippi: about 200-mile linear corridor delineation that crossed both states, with endangered species surveys, stream characterization, an environmental assessment, and permitting. The Alabama segment was Mobile District work.
- Perch Creek Parks, Mobile: wetland and habitat mapping and a habitat and shoreline analysis for the City of Mobile’s Perch Creek Parks master plan, a concept redesign of three waterfront parks, plus conceptual design of shoreline protection, piers, kayak launches, and habitat improvements.
- Mobile District mitigation banks: delineations and bank documents for the Little Biloxi River, Lower Devil’s Swamp, and Texas Flat mitigation banks in coastal Mississippi, using the same district stream SOP and wetland assessment tools that apply to south Alabama sites.
Working in Mississippi, Florida, or Louisiana? See our pages for Mississippi, Florida, and Louisiana.
Alabama wetland delineation FAQ
Do I need a wetland delineation before applying for a permit in Alabama?
If your project may place fill in wetlands or streams, yes. The Mobile or Nashville District needs mapped boundaries to evaluate the permit, and in the coastal area of Mobile and Baldwin Counties, ADEM needs them for its coastal permit or consistency review. A delineation report submitted with the application, or a JD, provides that boundary.
If I’m certain I have wetlands, can I do the delineation and permitting concurrently?
Yes, and combining them usually saves time and money. When you’re confident wetlands are present, we can delineate the site and prepare the permit application together, and the Corps typically processes a delineation faster when it comes with a permit application.
Which Corps district handles my site, Mobile or Nashville?
It depends on which watershed the site drains to. The Mobile District covers about 87 percent of Alabama, including everything that drains to Mobile Bay and the coastal rivers. The Nashville District covers the Tennessee River drainage of north Alabama, including Huntsville, Decatur, and the Shoals. Sites near the divide, such as in Marshall, DeKalb, and Lawrence Counties, need to be checked parcel by parcel.
Who regulates wetlands in Alabama?
The Corps regulates waters of the United States. ADEM certifies Corps permits under Section 401 and, in the coastal area of Mobile and Baldwin Counties, runs coastal permitting and consistency under the program ADCNR manages. ADCNR authorizes use of state water bottoms, and TVA reviews work in the Tennessee River system.
Is my Mobile or Baldwin County site in the Alabama coastal area?
Only if it lies seaward of the continuous 10-foot contour. Large parts of both counties are landward of it, so the county alone doesn’t answer the question. We check the contour in the desktop review and confirm it against the site survey.
What does a wetland delineation cost in Alabama?
It depends on the site. The main drivers are acreage and shape, vegetation and access, soils and past clearing or bedding, the season, whether the site is in the coastal area, the Tennessee Valley, or near a district line, and whether you need Corps verification, a JD, or a licensed survey. Send us the location, approximate acreage, and what you plan to build, and we’ll scope it.
How long is a wetland delineation valid in Alabama?
An approved JD normally stays valid for five years unless new information comes up. Delineation reports and preliminary JDs carry no federal expiration date, but expect the district to ask for fresh data after site changes, a long gap, or a rule change.
Request a wetland delineation in Alabama
Tell us where the parcel is, how large it is, and what you plan to build. We’ll tell you which district reviews it, which state permits may apply, and whether a delineation, a JD, or both make sense.
Contact Cypress or call 228-596-1580. Alabama office: 150 Government Street, Suite 950-1000, Mobile, AL. Headquarters: 772 Howard Avenue, Biloxi, MS. We also have an office at 13 Palafox Place, Pensacola, FL. Monday–Friday, 9 a.m.–5 p.m.