Federal Clean Water Act Section 404 and a Corps jurisdictional determination are not the whole permit stack on the Gulf. Mississippi, Alabama, Louisiana, and Florida each run water-quality and coastal programs that still bind a project when federal jurisdiction shrinks — and that bind it when federal jurisdiction remains.
This page is one private-client overview of Section 401 water quality certification (WQC), coastal consistency / coastal-program review, and the state overlays that matter most from Biloxi through Mobile and Pensacola, and across the rest of our Southeastern / Gulf practice. Use it to map lanes early; confirm against the current agency form, fee schedule, and district operating agreement before you budget or sequence work.
Sackett v. EPA narrowed which features the federal government still claims as waters of the United States. It did not repeal Mississippi’s coastal wetlands program, Alabama’s Division 8 coastal rules, Louisiana’s coastal use permit, or Florida’s Environmental Resource Permit. A Corps “not jurisdictional” letter can remove one gate and leave the others standing. See Sackett v. EPA, What are isolated wetlands?, and What is a jurisdictional determination?. For how 401 sits next to 404, see 401 vs 404 permit.
Side-by-side: what differs by state
Use this table to see where the lanes split. Details change; confirm against the current agency form and fee schedule before you budget.
| Topic | Mississippi | Alabama | Louisiana | Florida |
|---|---|---|---|---|
| 401 WQC lead agency | MDEQ (statewide) | ADEM (statewide) | LDEQ (statewide) | FDEP; often tied to the ERP decision |
| Coastal / CZM program | MS DMR leads the Mississippi Coastal Program; coastal zone = Hancock, Harrison, and Jackson Counties (seaward to state jurisdictional limits) | ACAMP: ADCNR–State Lands (policy) + ADEM Coastal (permitting/enforcement); coastal area seaward of the continuous 10-ft contour in Baldwin & Mobile Counties | Louisiana Coastal Resources Program / Coastal Use Permit (CUP) via OCM / Office of Permitting and Compliance under the state’s coastal management agency | Florida Coastal Management Program; ERP final action typically serves as CZM consistency for covered activities |
| State wetland / coastal overlay | Coastal wetlands permit + consistency via DMR joint package in the three coastal counties; inland features still face 401 when a federal permit triggers it | ADEM Division 8 coastal permits / consistency for listed coastal-area activities (beach/dune, large developments, dredge/fill of water bottoms & wetlands, etc.) | CUP for many dredge/fill, bulkhead, marina, and development activities in the mapped coastal zone — often alongside Corps 404/10 | ERP (FDEP or the water management district) for wetlands, surface waters, and much stormwater — whether or not the Corps still claims the feature after Sackett |
| Mitigation / credit quirks | Corps/IRT banks for federal impacts; coastal wetlands mitigation follows DMR/program rules | Federal mitigation for 404 impacts; coastal program conditions can add site-specific requirements | CUP compensatory mitigation for net coastal-resource loss; credits generally from OCM/OPC-approved banks, approved in-lieu fee, or other OCM-accepted options — not “any Corps bank will do” | ERP mitigation under state rules; separate from (and sometimes parallel to) federal 404 mitigation when both apply |
| Fees / cost signals | Application fees are typically modest next to engineering and mitigation (DMR commercial coastal application historically in the hundreds, not thousands) | ADEM’s published Fee Schedule B coastal fees for larger coastal developments and water-bottom / wetland work run into the thousands (e.g. multi-acre coastal developments and many dredge/fill line items) — budget them early; confirm the live schedule | CUP processing plus separate mitigation evaluation fees; credit cost is market-driven and often the larger line item | ERP fees vary by agency and project size; the real cost driver is often the dual ERP + federal path and redesign cycles |
| Extra review layers | Joint DMR / MDEQ / Corps coordination on coastal-county work; Mobile or Vicksburg District by geography | Inland vs coastal paths differ — do not assume Mobile County practice is statewide; some beach/dune work is locally delegated | Local coastal programs in some parishes; landowner on-site mitigation option can affect how credits are structured | Water management districts share ERP with FDEP; which office reviews you depends on location and project type |
| 404 / Corps relationship | Corps retains 404 (Mobile or Vicksburg by geography); 401 is state paper on that federal permit | Corps retains 404 (Mobile District for most coastal AL); ADEM 401 + coastal consistency ride with it | Corps retains 404 (New Orleans or Vicksburg by geography); LDEQ 401 + CUP/consistency as applicable | Florida assumed 404 for certain waters, then a Feb. 15, 2024 court order paused State 404; applicants for those waters go back to USACE Jacksonville while appeal / legislation continue. ERP still applies either way |
Mississippi
Mississippi splits cleanly between a coastal-zone program and statewide water-quality certification. Knowing which footprint you are in is the first-week question.
MDEQ Section 401
The Mississippi Department of Environmental Quality (MDEQ) is the statewide Section 401 certifying authority. When a federal license or permit may result in a discharge to waters of the United States — most often a Corps Section 404 (and sometimes Section 10) authorization — the applicant needs MDEQ to certify that the discharge will meet Mississippi water-quality standards, or to deny or condition that certification.
Practical notes for private clients:
- Pre-filing meeting. Under the current federal 401 rule framework, a written pre-filing meeting request to MDEQ is required at least 30 days before submitting a certification request. Treat that as real schedule, not paperwork theater.
- How the request rides. For many Corps actions, the federal public notice process is the vehicle that starts the 401 clock; do not assume “the Corps has the package” means MDEQ has everything it needs.
- Conditions matter. Turbidity, stormwater controls, outstanding waters, and antidegradation language on a Mississippi 401 can bind construction methods as tightly as Corps special conditions.
DMR coastal program (Hancock, Harrison, Jackson)
The Mississippi Department of Marine Resources (MDMR / DMR) is the point of contact for wetlands permits in the Mississippi Coastal Zone, defined as Hancock, Harrison, and Jackson Counties seaward to the state’s jurisdictional limits. Under agreements with the Mobile and Vicksburg Districts of the Corps, applications for wetland impacts in that coastal zone are submitted to DMR — electronically through the Wetlands Permitting Portal or on the Joint Application and Notification Form. DMR evaluates completeness and forwards copies to the appropriate agencies.
That joint package is why coastal-county work feels different from inland Mississippi:
- One form, multiple agencies. DMR coastal wetlands / consistency, MDEQ 401, and Corps 404/10 can sit in the same conversation instead of three disconnected queues.
- Coastal wetlands vs. upland wetlands. Not every wet feature in a coastal county is a “coastal wetland” under the Coastal Wetlands Protection Act, but coastal-zone consistency and the joint process still apply to regulated activities in those counties.
- Fees. DMR application fees for coastal work have historically been modest (single-family vs. commercial line items measured in tens to hundreds of dollars, plus publication costs) compared with engineering, surveys, and mitigation. Confirm the current form; do not treat that as the project cost signal.
Inland vs. coastal; when federal JD is “no”
Inland of the three coastal counties, you generally leave the DMR coastal-wetlands joint package behind. You do not leave water-quality review behind. If a federal license or permit still triggers Section 401, MDEQ certification remains on the path. Isolated or non-WOTUS features after Sackett may fall outside Corps 404 — and still matter for state stormwater, local floodplain, or other non-404 lanes.
When the Corps JD is “no” in a coastal county, ask the next question immediately: does the activity still need a DMR coastal wetlands permit or coastal-zone consistency determination? Federal non-jurisdiction is not a DMR bye. Map both answers on the same sketch before anyone prices fill or schedules contractors.
Alabama
Alabama’s coastal story is ACAMP plus ADEM Division 8 — and the fee schedule is a private-client cost signal that inland Alabama work does not prepare you for.
ADEM Section 401
The Alabama Department of Environmental Management (ADEM) is the statewide Section 401 certifying authority. For Corps dredge-and-fill work, ADEM 401 rides with the federal permit path. Inland of the coastal area, that is often the main state water-quality overlay on a 404. Inside the coastal area, 401 and coastal program review can stack.
ACAMP and the coastal area (Baldwin & Mobile, 10-ft contour)
Alabama’s Coastal Area Management Program (ACAMP) has been in effect since 1979. It is a joint effort:
- ADCNR–State Lands — planning and policy development for the coastal program.
- ADEM Coastal — permitting, monitoring, and enforcement under Division 8 (ADEM Admin. Code r. 335-8).
The coastal area is the waters and adjacent shorelands lying seaward of the continuous 10-foot contour in Baldwin and Mobile Counties, extending seaward to the outer limit of the U.S. territorial sea. That contour is not “anything near the beach.” Large parts of Mobile and Baldwin Counties sit landward of it; coastal Division 8 triggers do not automatically apply county-wide. Conversely, work seaward of the contour — including developments adjacent to coastal waters, wetland impacts, water-bottom work, and beach/dune construction — can pull ADEM coastal authorization even when the engineering team thinks of the site as “just Mobile County.”
Some Gulf-fronting beach and dune construction permitting is locally delegated (e.g., certain municipalities and the Baldwin County Commission for specified construction-control-line work). Know who holds the stamp before you assume every beach job runs through ADEM’s Mobile Coastal Office.
Division 8 fees that run into the thousands
ADEM’s published Fee Schedule B (Coastal Use Permits, Statewide Water Quality Certification, and Project Reviews) in Alabama Admin. Code r. 335-1-6-.07 is not a token filing fee for larger coastal work. Examples from the published schedule (confirm the live rule before you bid — ADEM has pursued further increases):
- Commercial and/or residential development wholly or partially in the coastal area: on the order of about $9,000 (greater than 5 and less than 25 acres), about $19,000 (25 to under 100 acres), and about $26,000 (100 acres or greater).
- Projects impacting wetlands or water bottoms: commonly about $2,100 to $4,200 depending on square footage or dredge volume, with larger dredge quantities and some marina/canal work higher.
- Beach and dune construction: from roughly $1,300 for a single-family / duplex line item up into the tens of thousands for larger multi-unit or commercial beach structures.
- Energy facility siting/construction/operation and mitigation bank reviews also sit in the multi-thousand / tens-of-thousands range on Schedule B.
Budget those fees early on Baldwin and Mobile coastal jobs. They are separate from survey, engineering, mitigation credit purchase, and Corps costs. Inland ADEM 401-only work does not look like this.
Inland vs. coastal paths
Do not export Mobile coastal practice to Huntsville — or assume an inland Autauga County wetland fill is “the same stack” as a Daphne waterfront pad. Inland Alabama typically means Corps 404 (where jurisdictional) + ADEM 401 + local floodplain / NPDES. Coastal-area Alabama often adds Division 8 permit or consistency review, Schedule B fees, and beach/dune or water-bottom criteria that redesign a bulkhead or fill footprint. Say which path you are on in week one.
Louisiana
Louisiana keeps Section 401 and the coastal use program in different shops — and coastal mitigation does not work like “buy whatever approved bank is cheapest.”
LDEQ Section 401
The Louisiana Department of Environmental Quality (LDEQ) issues Section 401 water quality certifications for federal licenses and permits that may result in a discharge to waters of the United States. On a Corps 404/10 action, LDEQ 401 is the water-quality lane. It is not the coastal use permit.
CUP / OCM coastal use
Activities in Louisiana’s mapped coastal zone often need a Coastal Use Permit (CUP) under the Louisiana Coastal Resources Program, administered through the Office of Coastal Management (OCM) / Office of Permitting and Compliance under the state’s coastal management agency. Typical CUP triggers for private work include dredge and fill, bulkheads and shoreline protection, marinas, canals, and many development activities that affect coastal waters or wetlands.
CUP review frequently runs alongside Corps Section 404 and Section 10 — not instead of them. Local coastal programs in some parishes can add another coordination layer. Treat “we already talked to the Corps” as incomplete until CUP status is explicit on the same matrix.
Mitigation credits: OCM-approved options, not any Corps bank
Louisiana’s coastal program rules require compensatory mitigation to offset net loss of ecological value from a permitted coastal use. For CUP purposes, acceptable options generally include:
- Purchase of habitat credits from an OCM / Office of Permitting and Compliance–approved mitigation bank
- Purchase of credits from an approved in-lieu fee program
- Implementation of an individual (permittee-responsible) mitigation project
- Other methods the secretary accepts as fully compensating for lost habitat values
That is the private-client gotcha: a Corps-approved bank that clears a federal 404 debit is not automatically acceptable for CUP compensatory mitigation. Credits for coastal-zone activities generally must come from banks or options the coastal program has approved or accepted. OCM also maintains an approved-bank list and can steer which bank(s) and credit types satisfy a given permit condition; unit prices are market-driven and set with the bank sponsor.
Landowner on-site option. Louisiana law and coastal mitigation procedures also give affected landowners a meaningful role: in many cases a landowner can require that compensatory mitigation occur on their property (on-site), subject to program acceptance that the proposal is sufficient. That can change credit strategy, schedule, and cost even when an approved bank exists nearby. Do not assume “we’ll just buy credits” until landowner notice and option timing are checked.
Cypress in Louisiana; New Orleans / Vicksburg context
Cypress Environment & Infrastructure is licensed in Louisiana and does not keep a Louisiana office. When the resource is in Louisiana, the state lanes still apply: LDEQ 401, CUP/consistency where the coastal zone is in play, and Corps review out of the New Orleans or Vicksburg District depending on geography. We coordinate those lanes the same way we do on the Mississippi–Alabama–Florida Gulf strip — with clear ownership of which agency owns which gate.
Florida
Florida is the dual-path state: ERP almost always, and federal 404 status that moved under applicants’ feet.
ERP via FDEP or a water management district
Florida’s Environmental Resource Permit (ERP) program (Part IV, Chapter 373, Florida Statutes; Chapter 62-330, F.A.C.) regulates stormwater management systems and dredging/filling in wetlands and other surface waters. FDEP and Florida’s five water management districts implement ERP under operating agreements. Which office reviews your application depends on location and project type — not on which logo is convenient for the applicant.
That split is an extra review layer private clients feel:
- Northwest Florida work often involves the Northwest Florida Water Management District and/or FDEP depending on the activity.
- Peninsula and southern Florida jobs route through the district map (Suwannee River, St. Johns River, Southwest Florida, South Florida) with FDEP retaining certain categories (including many activities seaward of the coastal construction control line and other marine-impact work).
- “Who is the reviewing agency?” belongs in week one. It affects forms, applicant’s handbook volumes, pre-app practice, and clock management.
ERP applies to many wetlands and surface waters whether or not the Corps still claims the feature after Sackett. A federal non-jurisdictional determination does not, by itself, close ERP.
ERP as CZM consistency
For many activities, the final ERP action serves as Florida Coastal Management Program consistency for associated federal permits. That is efficient when it works — and easy to misunderstand. ERP exemption status, federal consistency for activities that do not get a standard ERP final action, and Coastal Construction Control Line / other coastal construction programs can still create separate consistency or authorization questions. Plain version: Florida often folds CZM consistency into the ERP decision for covered activities, but you still need to know whether your action is in that covered set.
State 404 assumption, then the February 2024 pause
Florida assumed Clean Water Act Section 404 permitting for certain (assumed) waters effective December 2020, with State 404 (Chapter 62-331, F.A.C.) running as a separate authorization alongside ERP. Roughly, projects in assumed waters needed both ERP and State 404; retained waters stayed with the Corps.
On February 15, 2024, a federal court order vacated EPA’s approval of Florida’s assumption and divested DEP of authority to issue State 404 permits. FDEP announced that all activity under the State 404 Program is paused until further court order. Florida appealed to the D.C. Circuit and has pursued legislative clarity; as of FDEP’s public program update, the pause remains the operating reality applicants must plan around.
What that means on the ground:
- Applicants needing Section 404 authorization in waters that had been state-assumed go back to USACE Jacksonville District (and the Corps’ Regulatory Request System / district intake process).
- Jacksonville has accepted Department of the Army applications and has described taking technical work product from prior State 404 processing where it meets federal requirements — without promising that every file transfers cleanly (delineation methods and JD practice can differ).
- ERP still applies either way. The court order paused State 404; it did not repeal Chapter 62-330 ERP. Budget and schedule the state ERP path regardless of whether 404 sits at FDEP or the Corps.
Dual-path cost and redesign risk
The expensive failure mode in Florida is not usually the ERP filing fee. It is sequencing:
- Designing only to Corps post-Sackett jurisdiction, then discovering ERP still requires avoidance, minimization, or different mitigation.
- Designing only to ERP, then rediscovering federal 404 (Jacksonville) special conditions, species coordination, or delineation differences after State 404 pause.
- Buying the wrong mitigation product for the wrong program.
- Finding out late which WMD or FDEP office owns the ERP.
Map ERP agency, Corps district status for the water, and mitigation rules on one sketch before schematic design hardens.
Section 401 deep-dive (all four states)
Section 401 of the Clean Water Act lets a state (or authorized tribe) certify that a discharge associated with a federal license or permit will comply with applicable state water-quality requirements — or waive, deny, or condition that certification. For most dredge-and-fill work on our Gulf strip, the federal permit in view is a Corps Section 404 authorization; Section 10 of the Rivers and Harbors Act often rides with it in tidal and navigable waters.
Timing with the Corps package
- Run 401 in parallel. Waiting until the Corps is “done” to discover a 401 condition is a self-inflicted delay. MDEQ, ADEM, LDEQ, and FDEP each have their own intake expectations; coastal joint packages (especially Mississippi DMR) can help, but they do not remove the need to feed the certifying authority real content early.
- Pre-filing and completeness. Federal 401 regulations have emphasized early engagement (including pre-filing meeting requests). State portals and checklists differ — Mississippi’s written pre-filing request is an example of schedule you can miss if you only watch the Corps clock.
- Public notice. On many individual permits, the Corps public notice is tightly linked to the 401 process. Nationwide / general permit pathways have their own 401 posture (granted, waived, conditioned, or needing individual certification). Read the general permit’s 401 status for your state instead of assuming blanket coverage.
Conditions
401 conditions can dictate turbidity controls, stormwater and dewatering practices, outstanding-resource-water protections, monitoring, and construction windows. Those conditions travel with the federal permit. Violating them is not a “state-only” problem.
When 401 does not attach
Section 401 attaches to a federal license or permit that may result in a discharge to waters of the United States. If there is no such federal license or permit — for example, a standalone state coastal permit, CUP, or ERP with no federal trigger — you are in a different state lane, not a 401 lane. Conversely, after Sackett, losing Corps jurisdiction can remove the 401 trigger even while ERP, CUP, or DMR coastal permitting continues. Do not conflate “no 401” with “no state review.”
Standards are state standards. Turbidity, dissolved oxygen, outstanding waters, and antidegradation are not identical in Jackson, Montgomery, Baton Rouge, and Tallahassee.
Coastal consistency (CZMA in plain language)
The federal Coastal Zone Management Act (CZMA) asks whether a federal action affecting a state’s coastal zone is consistent with that state’s approved coastal management program. For private applicants, the version you feel is usually:
- You need a federal permit (often Corps 404/10).
- The activity is in (or affects) the state’s coastal zone.
- The state coastal program must concur that the activity is consistent with its enforceable policies — or the federal permit stalls.
How that concurrence is packaged differs by state on this page:
- Mississippi — DMR runs coastal program review in Hancock, Harrison, and Jackson; the joint application is built to pull consistency into the same process as coastal wetlands permitting.
- Alabama — ACAMP consistency / Division 8 authorization for listed activities in the coastal area (Baldwin and Mobile seaward of the 10-ft contour).
- Louisiana — CUP and coastal program review in the mapped coastal zone, with parish-level coastal programs in some places.
- Florida — For many activities, ERP final action functions as the coastal-management consistency vehicle for associated federal permits.
Plain language: coastal consistency is the state’s way of saying “even if the Corps would allow the fill, our coastal program still gets a say.” Sackett did not turn that off.
What these state programs do not replace
State 401, coastal consistency, CUP, and ERP are real gates. They are not the whole matrix:
- Local floodplain development permits and flood zone / BFE rules — including coastal V/VE and LiMWA questions on Gulf FIRMs
- No-rise certifications or map revisions when the floodway is involved
- ESA and state species rules (see gopher tortoise surveys when habitat is present)
- NPDES construction stormwater (and related state stormwater construction authorizations)
- Section 10, Section 408 (Corps civil works), and other federal lanes that are not “wetlands JD” problems
Clearing MDEQ 401 does not clear a county floodplain permit. Clearing ERP does not clear tortoise relocation. Clearing a CUP does not clear NPDES.
How Cypress uses this / when we get pulled in
We map the federal and state lanes on the same site sketch — 401 certifying authority, coastal consistency or CUP, ERP and the right water management district, Division 8 or DMR coastal triggers, and the Corps district that actually has the water (Mobile, Vicksburg, New Orleans, or Jacksonville) — and say plainly when Sackett only removed one gate.
We get pulled in when a private client needs the civil and environmental paths coordinated before a Baldwin/Mobile coastal Schedule B fee, a Louisiana CUP mitigation condition that will not accept the wrong bank, or a Florida ERP redesign shows up after schematic design. Early lane-mapping is cheaper than late avoidance.
Cypress Environment & Infrastructure works from Biloxi, Mobile, and Pensacola, and throughout the Gulf region and Southeastern United States . Office hours are Monday–Friday, 9 a.m.–5 p.m. If your site sits across these state lines — or you are not sure which overlay still binds after a JD — contact us.
See 401 vs 404, isolated wetlands, What is a Corps of Engineers district?, What is an IRT?, and projects. This page is not four state applications and not a site opinion. Confirm current forms, fee schedules, and district guidance before you rely on any row in the table.