Louisiana
The stormwater permit for construction in Louisiana
Louisiana runs its own NPDES programme, so a state issued construction general permit governs. Below is what our engine can say about it, and where we have not read that permit, what it will not say.
Governing permit
Storm Water General Permit for Large Construction Activities (LAR100000)
- Issued by
- Louisiana Department of Environmental Quality (LDEQ), LPDES program
- Permit number
- LAR100000
- Version determined against
- as published by the state agency
- Effective
- 2024-10-01
- Expires
- 2029-09-30
Who may prepare the plan
No preparer credential foundNo preparer credential was found for Louisiana. On what we have verified, a generated plan can be adopted by the operator without a credentialed signature. Local ordinances can still be stricter than state law.
No preparer credential found in the reviewed sources. Not exhaustively verified; confirm with the state agency and any local ordinance.
No permit section cited. Confirm this with your permitting authority.
Does a site in Louisiana need coverage
Worked for a one acre site as a reference point. Change the acreage in the tool below and the answer, and its reasoning, change with it.
Coverage
Permit coverage required
The project disturbs 1 acres, at or above the 1 acre threshold, so it needs permit coverage.
Determined against dataset version 2026-07-19.
Read these before you act on the answer
- Requirements below are what we have read and cited directly from Storm Water General Permit for Large Construction Activities (LAR100000), not the federal CGP. A category we have not yet transcribed from this permit is omitted here rather than assumed to match EPA's rule.
- Direct fetch of the live deq.louisiana.gov PDF returned HTTP 403; the operative permit text was verified via a Wayback Machine capture cross-checked against PDF metadata (CreationDate 2024-09-26). No explicit 'Effective Date' line was found; 2024-10-01/2029-09-30 are derived from the reauthorization clause and the permit's 5-year-term rule, so mark as strong-inference rather than directly quoted. This permit (LAR100000) covers only construction activity disturbing 5+ acres; Louisiana also has a separate small-construction general permit (LAR200000, 1-<5 acres) not verified in this session. Contains no numeric effluent limits/benchmarks (explicitly a 'non-numeric limitations' permit). No fixed day-count deadline for NOT filing was found -- termination is condition-based/automatic, so deadline.not.submission is omitted.
- No preparer credential was found for Louisiana. On what we have verified, a generated plan can be adopted by the operator without a credentialed signature. Local ordinances can still be stricter than state law.
- Basinwise does not perform the physical site inspections the permit requires. Those must be carried out on site by a qualified person.
How this answer was reached, step by step
- 1
Coverage threshold
The project disturbs 1 acres, at or above the 1 acre threshold, so it needs permit coverage.
- 2
Permitting authority
Louisiana. The state runs its own programme under LAR100000.
- 3
Preparer credential
No preparer credential was found for Louisiana. On what we have verified, a generated plan can be adopted by the operator without a credentialed signature. Local ordinances can still be stricter than state law.
What to do next
- 1. Confirm the governing permit. Read Storm Water General Permit for Large Construction Activities (LAR100000) directly. It is linked above, and it is the document an inspector will hold you to. Louisiana Department of Environmental Quality (LDEQ), LPDES program
- 2. Settle the preparer question before you draft. Getting this wrong costs a redraft at best. The detail is on the credential page for this state. Preparer credential in Louisiana
- 3. Screen the site. Run the real acreage and receiving water facts through the tool below. You get the inspection frequency, the stabilisation deadlines and the filing path with the permit section behind each.
- 4. Read the requirements in full. SWPPP requirements in Louisiana
Screen a Louisiana site now
Runs in your browser. Nothing about the site is transmitted.
What people ask about the Louisiana construction stormwater permit
Do I need a stormwater permit for a construction site in Louisiana?
Permit coverage is triggered at one acre of land disturbance, and below one acre if the project is part of a larger common plan of development or sale that will ultimately disturb an acre or more. The project disturbs 1 acres, at or above the 1 acre threshold, so it needs permit coverage.
Who issues the construction stormwater permit in Louisiana?
Louisiana Department of Environmental Quality (LDEQ), LPDES program issues Storm Water General Permit for Large Construction Activities (LAR100000).
Does Louisiana require a qualified preparer for the plan?
No preparer credential was found for Louisiana. On what we have verified, a generated plan can be adopted by the operator without a credentialed signature. Local ordinances can still be stricter than state law.
Keep the record Louisiana will ask you for
The screening is free. Holding the written plan and the retained inspection log is what the permit actually demands.