State permit

MSR10: Mississippi large construction stormwater permit

MSR10 is the Large Construction Storm Water General Permit the Mississippi Department of Environmental Quality (MDEQ) issues for construction disturbing 5 acres or more, or less than 5 acres within a larger common plan of development or sale. MSR10 ACT1 T-1 It was issued February 4, 2022 and expires January 31, 2027. MSR10 cover page Coverage starts only when MDEQ sends written notification, and the site-specific SWPPP is submitted with the application. MSR10 ACT4 S-1, S-2 Checked October 20, 2026.

Sources last checked October 19, 2026. Prepared by our team led by Mohamed Elansary, PhD, with AI research tools. We are not a licensed engineering firm and do not seal plans.

General information; your permit text controls. Not legal advice and not engineering judgment. We make no promise of permit coverage, agency acceptance or compliance.

MSR10 at a glance

Item	Rule	Source
Permit	MSR10, Large Construction Storm Water General Permit	MSR10 permit text
Agency	MDEQ, Office of Pollution Control, Environmental Permits Division	MSR10 ACT4 T-2
Issued / expires	Issued February 4, 2022; expires January 31, 2027	MSR10 cover page
Who applies	Owners and/or operators. The operator is typically the prime contractor; the owner may file the LCNOI and the operator later files a Prime Contractor Certification accepting joint and severable responsibility. Every operator on the project needs coverage; subcontractors generally are not operators. Projects with multiple operators submit a group SWPPP unless MDEQ approves otherwise.	MSR10 ACT3 S-1
What you submit	A Large Construction Notice of Intent (LCNOI) with the site-specific SWPPP and a USGS quad map (or color copy) extending at least half a mile beyond the property boundaries, with the site outlined	MSR10 ACT4 S-2
How to submit	Forms at mdeq.ms.gov/construction-stormwater/ (601-961-5171). After December 21, 2025, the forms are submitted electronically through that web address	MSR10 ACT4 T-1, T-2
When work can start	Discharging stormwater without written notification of coverage is a violation. Coverage is not granted until other required MDEQ permits and approvals are addressed	MSR10 ACT4 S-1, T-1
Fee	None. MDEQ's guidance manual says its general permits do not require a fee at this time	MDEQ SWPPP guidance manual, FAQ p. 25
Plan standard	A site-specific SWPPP prepared in accordance with sound engineering practices. The permit text names no preparer licence	MSR10 ACT5 T-1
Inspections	By qualified personnel on MDEQ's form (or equivalent): at least weekly for a minimum of four per month, after rain events that produce a discharge, and as often as needed. MDEQ strongly recommends a daily walk-through	MSR10 ACT6 S-5; ACT5 T-16
Repairs	Deficiencies corrected as soon as possible, not to exceed 24 hours of the inspection unless unsafe weather prevents it and that is documented on the form	MSR10 ACT5 T-16
Sediment basins	Drainage locations serving 10 or more disturbed acres at one time need a basin of at least 3,600 cubic feet (133 cubic yards) per acre drained, installed before initial grading. Linear projects are not required to use basins	MSR10 ACT5 T-6(2)(A)-(B)
Records	Kept at least 3 years; inspections documented on the Monthly Inspection Report and Certification Form	MSR10 ACT9 R-1, S-2
Termination	Request for Termination with color photographs of the stabilized site within 30 days of final stabilization. Coverage ends only when MDEQ notifies you in writing	MSR10 ACT10 S-1

The January 31, 2027 expiry

If MDEQ has not reissued MSR10 by its expiration date, existing coverage continues until the reissued permit takes effect. Once it is reissued, active coverage recipients receive a Recoverage Form with a Letter of Instruction, and return it as instructed to stay covered. MSR10 ACT3 S-3 SWPPP resubmittal is not required if the SWPPP is on site or locally available, current, and adequately addresses the site's pollution sources, though some SWPPPs may need amendments to meet the reissued permit. MSR10 ACT3 S-3

What the SWPPP must show

MSR10 asks for a scaled site map with a north arrow, original and proposed contours where feasible, drainage arrows, sensitive areas, inlets and the receiving MS4, all erosion and sediment controls, post-construction controls, the construction entrance, concrete washout, waste, laydown and chemical storage areas, and buffer zones. MSR10 ACT5 T-13 Dewatering follows the eight items in ACT5 T-11. MSR10 ACT5 T-11 See also SWPPP site map requirements and sediment basins.

What we do

We prepare MSR10 SWPPPs for large Mississippi sites (5 acres or more). Small sites fall under a separate permit, MSR15, which we do not offer yet. Runoff and post-construction calculations, and the design of post-construction controls, come from your project designer. We do not calculate or design them (Terms 6.1); the plan lists them as items your designer supplies. We prepare the plan document. We do not stamp plans, visit sites or file the NOI; you file it. The site check at checkout applies the Mississippi limits shown on the Mississippi hub before payment.

Large site (5 acres or more): $749

Questions

Is there a fee for MSR10 coverage?

No. MDEQ's SWPPP guidance manual says its general permits do not require a fee at this time.

Can I start work as soon as I submit the LCNOI?

No. MSR10 says discharging stormwater without written notification of coverage is a violation, so wait for MDEQ's written coverage.

How often must an MSR10 site be inspected?

At least weekly for a minimum of four inspections per month, after rain events that produce a discharge, and as often as needed, by qualified personnel on MDEQ's form.

What happens when MSR10 expires on January 31, 2027?

If it is not reissued by then, coverage continues until the reissued permit is effective. After reissuance, MDEQ sends active permittees a Recoverage Form with a Letter of Instruction.

Does SWPPP Desk write plans for small Mississippi sites?

Not yet. Sites under 5 acres fall under MSR15, which we have not verified, so only large sites under MSR10 are offered.