Pro SWPPP – America’s #1 SWPPP Service – is a family-owned firm with 20+ years in stormwater compliance, preparing apartment and multifamily construction plans nationwide. The most common question we hear from contractors is simple: Do I actually need a SWPPP for this job? The short answer is yes, almost always. If your multifamily project disturbs one acre or more of land, or if it’s part of a larger development that will eventually disturb one acre or more, federal and state law require a Stormwater Pollution Prevention Plan (SWPPP) and NPDES construction stormwater permit coverage before you break ground. This guide walks you through exactly when a SWPPP is required, who enforces it, what happens if you skip it, and how to get compliant fast.
Not sure whether your build crosses the threshold? Take the 60-second SWPPP quiz and find out before you break ground.
Most contractors underestimate how quickly an apartment or townhome build crosses the one-acre threshold. Between building pads, parking lots, access roads, utilities, detention ponds, and staging areas, even a modest multifamily project can easily disturb two to five acres. And even if your individual pad is under an acre, if it’s part of a larger master plan or phased development, you’re still on the hook for a SWPPP. This isn’t optional, and the penalties for getting caught without one can shut down your project and cost you six figures in fines and delays.
When Does an Apartment or Multifamily Build Need a SWPPP?
Under the federal Clean Water Act and the NPDES (National Pollutant Discharge Elimination System) program, any construction activity that disturbs one acre or more of land requires a construction stormwater permit and a site-specific SWPPP. This rule applies nationwide, whether the EPA or a state environmental agency runs the permit program in your area. Most states have their own version of the EPA’s Construction General Permit (CGP), but the core trigger is the same: one acre of disturbed soil equals mandatory permit coverage and a SWPPP.
What counts as “disturbed” land? Everything you touch. Clearing, grading, excavating, trenching for utilities, building roads, installing detention basins, and even staging areas all count toward your total disturbed acreage. For multifamily projects, this adds up fast. A single garden-style apartment building with parking and landscaping can easily hit two acres. Add in shared infrastructure like a clubhouse, pool, stormwater basin, or access road, and you’re well over the threshold.
Pro SWPPP regularly works with multifamily developers who are surprised to learn that their “small” project needs a full SWPPP. The law doesn’t care about the number of units or the building footprint. It only cares about how much dirt you move.
The “Common Plan of Development” Rule
Here’s where it gets tricky for multifamily contractors. Even if your individual building site is under one acre, you still need a SWPPP if your work is part of a larger common plan of development or sale that will ultimately disturb one acre or more. This rule catches a lot of contractors off guard, especially on phased projects.
A common plan of development means any construction activity performed by one or more operators on contiguous or nearby parcels that are part of the same overall project. Think master-planned communities, phased apartment complexes, or multifamily subdivisions where the developer is building out multiple pads over several years. If the total planned disturbance across all phases is one acre or more, every phase and every pad requires permit coverage and a SWPPP, even if each individual phase is tiny.
Example: A developer subdivides a ten-acre parcel into five multifamily building pads. You’re hired to build just Pad A, which is only 0.7 acres. Do you need a SWPPP? Yes, because the common plan is ten acres. The EPA and state regulators treat the entire development as one project for stormwater purposes, and every operator working on any part of that project must have permit coverage.
How to Calculate Your Total Disturbed Acreage
Don’t guess. Measure your total disturbance carefully, and include everything that will be cleared, graded, or excavated during construction. Here’s what to count:
- Building footprints (all structures, not just residential units)
- Parking lots, driveways, and access roads
- Utility trenches (water, sewer, electric, gas, telecom)
- Stormwater detention or retention basins
- Landscaping areas that require grading or topsoil stripping
- Staging areas, material laydown yards, and temporary construction entrances
- Any off-site improvements tied to the project (road extensions, utility tie-ins)
If the total is one acre or more, you need a SWPPP. If your project is part of a larger common plan, add up the disturbance across all phases and pads. If that total is one acre or more, every operator on every phase needs a SWPPP.
Who Enforces SWPPP Requirements for Multifamily Projects?
SWPPP enforcement for multifamily construction comes from three layers: federal, state, and local. Understanding who has authority in your area is critical, because the rules and enforcement can vary.
Federal vs. State Permitting Authority
The federal EPA administers the NPDES construction stormwater program directly in a handful of states, territories, and tribal lands. In these areas, you apply for coverage under the EPA’s 2022 Construction General Permit. But in most of the country, the EPA has authorized individual states to run their own NPDES construction stormwater programs. These states issue their own Construction General Permits (CGPs), which must meet or exceed federal standards but can add stricter state-specific requirements.
For example, in Texas, the TCEQ (Texas Commission on Environmental Quality) runs the construction stormwater program and issues its own CGP. In Georgia, the Georgia EPD (Environmental Protection Division) handles permitting. In California, the State Water Resources Control Board issues a statewide Construction General Permit. Each state has its own application process, fee structure, and technical requirements, but the core trigger (one acre or part of a larger plan) is the same.
Pro SWPPP operates nationwide and knows every permitting authority’s rules inside and out. We prepare SWPPPs that comply with both federal baselines and state-specific add-ons, so you don’t have to become an expert in every jurisdiction.
Local Enforcement and MS4s
Many cities and counties also enforce local stormwater ordinances, especially if they operate a Municipal Separate Storm Sewer System (MS4). MS4 communities are required by their own NPDES permits to prevent illicit discharges and control construction site runoff. That means local inspectors can show up at your multifamily site, check your SWPPP and erosion controls, and issue stop-work orders or fines if you’re out of compliance.
Some local jurisdictions require you to submit your SWPPP or erosion and sediment control plan to the city or county for review before you get a grading permit. Others require local permits or approvals in addition to the state NPDES permit. Don’t assume that having your state NPDES coverage clears you locally. Always check with the local building department or stormwater utility.
What Happens If You Don’t Get a SWPPP for Your Multifamily Project?
Skipping the SWPPP is not a shortcut. It’s a violation of the Clean Water Act, and the consequences can be severe. Here’s what happens when you get caught building a multifamily project without required permit coverage and a SWPPP.
Enforcement Actions and Penalties
If the EPA or a state environmental agency discovers you’re disturbing one acre or more without a construction stormwater permit, they can issue a Notice of Violation (NOV). The NOV will typically require you to stop work, apply for permit coverage immediately, develop and implement a SWPPP, and install all required erosion and sediment controls before you can resume construction. You may also face civil penalties. The Clean Water Act authorizes fines up to tens of thousands of dollars per day of violation. For a multifamily project that runs for months without a SWPPP, that exposure can easily reach six figures.
State agencies and local governments can also issue administrative orders, require corrective action, or refer cases for judicial enforcement. In some states, repeat offenders or serious violations can result in consent decrees that force ongoing third-party monitoring and reporting for years.
Stop-Work Orders and Project Delays
Beyond fines, the bigger financial hit is usually delay. A stop-work order halts all construction activity until you’re in compliance. That means your crew sits idle, your schedule slips, your lender or investor gets nervous, and your carrying costs pile up. For a multifamily project with pre-leasing commitments or financing deadlines, even a two-week shutdown can cost more than the SWPPP itself would have.
Local building departments can also withhold occupancy permits or utility connections if stormwater compliance isn’t resolved. Pro SWPPP has helped dozens of contractors get back on track after enforcement actions, but the cheapest and fastest way to handle SWPPP compliance is to do it right from the start.
Liability for Sediment and Pollution Discharges
If your site discharges sediment-laden runoff into a stream, wetland, or municipal storm drain, you can also face liability for water quality impacts. Sediment pollution is the number one pollutant from construction sites, and it can trigger additional enforcement under state water quality standards or Total Maximum Daily Load (TMDL) programs. In some cases, contractors have been required to fund stream restoration or mitigation projects as part of settlement agreements.
What Must Be Included in a Multifamily SWPPP?
A SWPPP is not just a piece of paper. It’s a detailed, site-specific plan that describes how you will prevent pollutants (especially sediment) from leaving your construction site in stormwater runoff. The EPA and state permits require SWPPPs to include specific elements, and inspectors will check for all of them.
Site Map and Project Description
Your SWPPP must include a legible site map showing the entire project area, including the locations of all soil disturbance, construction entrances, stormwater controls (silt fences, sediment basins, inlet protection), drainage patterns, discharge points, and receiving waters. The map should also show the locations of any sensitive areas, such as wetlands, streams, or steep slopes. A clear project description should summarize the type of construction (multifamily residential), total disturbed acreage, construction sequencing, and estimated start and completion dates.
Identification of Potential Pollutant Sources
Multifamily construction generates a variety of pollutants beyond just sediment. Your SWPPP must identify and address all potential sources, including:
- Sediment from cleared and graded areas
- Concrete washout and slurry from foundation and flatwork
- Fuels, oils, and hydraulic fluids from construction equipment
- Paints, solvents, and adhesives used in building finishes
- Construction debris and trash
- Sanitary waste from portable toilets
- Dust and airborne particulates that settle on paved areas
For each pollutant source, the SWPPP must describe the Best Management Practices (BMPs) you will use to prevent or minimize discharges.
Best Management Practices (BMPs)
BMPs are the erosion and sediment controls, housekeeping practices, and pollution prevention measures you will implement on site. For multifamily projects, typical BMPs include:
- Perimeter controls: Silt fence, fiber rolls, or sediment barriers along the downslope edge of disturbed areas
- Sediment basins or traps: Sized to capture runoff from the entire drainage area and allow sediment to settle before discharge
- Construction entrance and vehicle tracking controls: Stabilized stone pad to prevent mud and sediment from being tracked onto public roads
- Inlet protection: Filter fabric, gravel, or other barriers around storm drain inlets to prevent sediment from entering the drainage system
- Temporary and permanent stabilization: Seeding, mulching, erosion control blankets, or other vegetation or hardscape to stabilize disturbed soils as quickly as possible
- Concrete washout containment: Designated area with temporary berms or prefab washout bins to contain concrete slurry and prevent discharge
- Spill prevention and response: Secondary containment for fuel and chemical storage, spill kits, and emergency contact information
- Waste management: Proper disposal of construction debris, sanitary waste, and hazardous materials
The SWPPP must describe each BMP, where it will be installed, and when it will be maintained or removed. Many state permits also require you to size sediment basins and other structural controls to specific design standards (for example, capacity to treat a two-year storm event).
Inspection and Maintenance Protocols
Your SWPPP must include a schedule and procedure for regular inspections. Most state permits require at least one inspection every seven calendar days and within 24 hours of the end of any storm event that produces 0.25 inches or more of rainfall (or 3.25 inches of snowmelt) under the 2022 EPA Construction General Permit. The 0.5-inch figure many contractors still quote came from the older 2017 permit. The inspection must verify that all BMPs are installed correctly and functioning, and that no unauthorized discharges are occurring. If deficiencies are found, you must correct them as soon as practicable (typically within seven days, or immediately if the deficiency poses an imminent risk of discharge).
All inspections must be documented in the SWPPP or an attached log, including the date, inspector name, findings, and corrective actions taken. Inspectors (EPA, state, or local) will ask to see these records, so keep them current and on site.
Stabilization Deadlines
The EPA CGP and most state permits require you to stabilize disturbed areas as quickly as possible. Common stabilization deadlines include:
- Temporary stabilization of any area that will be idle for 14 days or more
- Permanent stabilization of all areas that have reached final grade and will not be disturbed again
- Stabilization of steep slopes or erodible soils within seven days of final grading
Stabilization usually means establishing vegetative cover (grass, groundcover) or applying a non-erosive surface (paving, gravel, landscaping). Until you achieve final stabilization across the entire site, your permit coverage and SWPPP obligations remain in effect.
Don’t want to mess with all the paperwork? Order your SWPPP now with Pro SWPPP Professional CPESC Certified SWPPP Services.
How to Get NPDES Permit Coverage for Your Multifamily Project
Once you’ve determined that your multifamily project needs a SWPPP, the next step is to obtain NPDES construction stormwater permit coverage. The process varies slightly by state, but the general steps are the same nationwide.
Prepare Your SWPPP Before You File
The EPA and all state permitting authorities require you to develop your SWPPP before you submit your Notice of Intent (NOI) or permit application. This is not optional. You cannot legally file for permit coverage without a complete, site-specific SWPPP in hand. The NOI asks you to certify that you have prepared a SWPPP that meets all permit requirements, so make sure it’s done and ready before you hit submit.
Pro SWPPP can prepare a fully compliant SWPPP for your multifamily project in 72 hours or less. We know exactly what every state permit requires, and our SWPPPs pass inspector review the first time.
Submit Your Notice of Intent (NOI)
The NOI is the formal application for construction stormwater permit coverage. In EPA-administered states, you submit the NOI electronically through the EPA’s eNOI system. In state-administered programs, you use the state’s online portal or paper form. The NOI requires basic project information (site address, latitude/longitude, owner and operator contact information, total disturbed acreage, receiving waters, and certification that your SWPPP meets permit requirements).
Most state programs also require you to certify eligibility under the Endangered Species Act (ESA) and any applicable Total Maximum Daily Load (TMDL) requirements. If your project is in an ESA-sensitive area or a TMDL watershed, you may need to complete additional screening or adopt enhanced BMPs before you can obtain coverage.
Processing times vary. In some states, coverage is automatic as soon as you submit the NOI and pay any required fee. In others, the agency reviews your NOI and issues a permit authorization letter. Check your state’s rules and allow time for processing before you plan to start construction.
Pay Any Required Permit Fees
Many states charge a fee for construction stormwater permit coverage. Fees can range from a few hundred dollars to over a thousand, depending on the state and the size of your project. Some states charge an annual fee if your project spans multiple years. Make sure you budget for these costs and pay on time, because unpaid fees can delay or invalidate your permit coverage.
Post and Maintain Required Notices
Most permits require you to post a copy of your permit coverage (or the permit authorization letter or NOI acknowledgment) at the construction site in a location accessible to the public and inspectors. Some states also require you to post the name and contact information of the operator responsible for SWPPP compliance. Keep these notices visible and up to date throughout construction.
Common Mistakes Multifamily Contractors Make with SWPPPs
Even experienced contractors make SWPPP mistakes that lead to violations and delays. Here are the most common pitfalls on multifamily projects, and how to avoid them.
Assuming You’re Under the Threshold Without Measuring
A lot of contractors eyeball the site and assume they’re under an acre, only to find out later that utilities, access roads, and detention basins pushed them over. Always measure your total disturbed acreage carefully, and always ask the owner about the larger common plan of development. If there’s any chance you’re over one acre or part of a larger plan, get a SWPPP and permit coverage before you start.
Using a Generic or Template SWPPP Without Site-Specific Details
The EPA publishes SWPPP templates, and they’re a good starting point, but a generic template is not a compliant SWPPP. Your SWPPP must be site-specific. It must include accurate site maps, correct drainage patterns, appropriate BMPs for your soil type and slope, and realistic construction sequencing. Inspectors can spot a generic template a mile away, and they will write you up for it.
Pro SWPPP never uses cookie-cutter templates. Every SWPPP we prepare is tailored to your exact site conditions, local permit requirements, and construction schedule.
Forgetting to Update the SWPPP During Construction
Your SWPPP is a living document. If your construction sequence changes, if you add a new drainage structure, or if you expand your disturbance area, you must update the SWPPP to reflect those changes. Many contractors prepare a SWPPP at the start of the job and never touch it again. That’s a violation. Keep your SWPPP current, and document any updates in the log.
Installing BMPs But Not Maintaining Them
BMPs don’t work unless you maintain them. Silt fence that’s knocked down or buried in sediment is useless. Sediment basins that aren’t cleaned out after storms will overflow and discharge sediment. Concrete washout bins that are full and abandoned are pollution sources, not BMPs. Your SWPPP requires you to inspect and maintain all BMPs on a regular schedule. Make sure your field crew knows this and has the time and budget to do it.
Not Conducting or Documenting Inspections
Inspections are not optional. Your permit requires them, and inspectors will ask to see the records. If you haven’t been conducting weekly inspections and storm event inspections, you’re out of compliance even if your BMPs are perfect. Assign someone on your crew to do the inspections, train them on what to look for, and keep the inspection log in your SWPPP binder on site.
How Strict States Add Requirements Beyond the Federal Baseline
While the federal one-acre threshold is consistent nationwide, many states add stricter or more detailed requirements on top of the EPA baseline. If you work in multiple states, you need to know these state-specific rules.
Lower Local Thresholds
Some cities and counties require erosion and sediment control plans or local stormwater permits for projects that disturb less than one acre. For example, a city might require a local grading permit and erosion control plan for any disturbance over 5,000 square feet, even though the federal NPDES program doesn’t apply until you hit one acre. Always check local ordinances, especially in urban or environmentally sensitive areas.
Additional BMP Design Standards
Some state permits specify detailed design standards for sediment basins, diversions, or stabilization practices that go beyond the EPA CGP. For example, a state might require sediment basins to be sized for a specific storm event (two-year, 24-hour storm) and provide a minimum surface area or retention time. Others require professional engineering certification for certain structural BMPs. Make sure your SWPPP preparer knows the state-specific design standards.
More Aggressive Stabilization and Inspection Requirements
Some states shorten stabilization deadlines (for example, requiring temporary stabilization within seven days of inactivity instead of 14) or increase inspection frequency (for example, requiring inspections after every storm event regardless of rainfall amount). These stricter requirements are enforceable, so make sure your SWPPP and your field practices match the state permit, not just the federal baseline.
Post-Construction Stormwater Requirements
Many states and local MS4 jurisdictions also require post-construction stormwater controls for multifamily projects, especially if the project will create new impervious surface (roofs, parking, driveways). Post-construction requirements are separate from the construction SWPPP, but they often must be addressed in the same permit application or site plan. Typical post-construction controls include retention or detention basins, bioretention cells, permeable pavement, or water quality treatment structures. Make sure you understand both the construction and post-construction stormwater requirements before you finalize your site design.
Not sure what your project needs? Schedule a Free SWPPP Consultation with CPESC Certified SWPPP Expert Derek E. Chinners.
How Much Does a SWPPP Cost for a Multifamily Project?
SWPPP costs vary based on project size, complexity, and location, but they are a tiny fraction of your overall construction budget. Here’s what to expect.
SWPPP Preparation Fees
A professionally prepared SWPPP for a typical multifamily project (two to five acres) usually costs between $800 and $2,500, depending on the number of phases, the complexity of the drainage design, and state-specific requirements. Larger or more complex projects (ten acres or more, multiple phases, sensitive receiving waters) can run higher. But even at the high end, the SWPPP cost is a rounding error compared to the cost of a stop-work order or enforcement action.
Pro SWPPP offers flat-rate pricing with no hidden fees. You’ll know exactly what your SWPPP costs before you order, and we deliver in 72 hours or less.
Permit Application Fees
State permit fees vary widely. Some states charge a few hundred dollars for construction stormwater permit coverage. Others charge based on disturbed acreage or project cost, and fees can exceed a thousand dollars for larger projects. Check your state environmental agency’s fee schedule and budget accordingly.
BMP Installation and Maintenance Costs
The cost of installing and maintaining erosion and sediment controls depends on your site conditions, but typical multifamily projects should budget 1 to 3 percent of total construction cost for stormwater BMPs. This includes materials (silt fence, sediment basins, erosion control blankets, inlet protection, concrete washout bins) and labor for installation, inspection, maintenance, and removal. If your site has steep slopes, erodible soils, or sensitive receiving waters, BMP costs can be higher.
Inspection and Documentation Costs
Weekly inspections and storm event inspections take time. Budget for crew time or a third-party inspector to conduct inspections, document findings, and make minor repairs or adjustments to BMPs. For a six-month multifamily project, inspection and documentation might add $2,000 to $5,000 to your overall stormwater compliance cost.
Penalty and Delay Costs (If You Skip the SWPPP)
If you skip the SWPPP and get caught, costs skyrocket. Enforcement penalties can range from $5,000 to $50,000 or more, depending on the severity and duration of the violation. Add in stop-work delays, corrective action costs, and legal fees, and you can easily hit six figures. The smartest move is to budget for compliance up front and avoid the risk altogether.
Why Pro SWPPP is the SWPPP Service Contractors Trust
Pro SWPPP has prepared construction SWPPPs for multifamily, commercial, industrial, and infrastructure projects nationwide, backed by 180+ five-star Google reviews. Our SWPPPs are prepared by CPESC (Certified Professional in Erosion and Sediment Control) certified experts in a family-owned firm with 20+ years in stormwater compliance. We know the federal EPA Construction General Permit inside and out, and we know the state-specific rules in every jurisdiction we serve.
CPESC Certified Expertise You Can Trust
Our lead SWPPP specialist, Derek E. Chinners, holds the CPESC certification, the gold standard in erosion and sediment control. CPESC certification requires years of field experience, rigorous testing, and ongoing continuing education. When you work with Pro SWPPP, you’re working with a team that has the credentials and the real-world experience to prepare SWPPPs that pass inspector review the first time.
Fast Turnaround Without Sacrificing Quality
We know construction schedules are tight. That’s why we offer a 72-hour turnaround on most SWPPP orders. We don’t use generic templates or outsource to unlicensed technicians. Every SWPPP is prepared in-house by our CPESC certified team, tailored to your exact site conditions, and reviewed for accuracy before delivery. You get professional quality at contractor speed.
Nationwide Coverage, State-Specific Compliance
We’ve prepared SWPPPs nationwide, from Texas to Georgia to California and everywhere in between. We know the state permit requirements, the local MS4 rules, and the BMPs that work in your region. Whether your project is in a high-rainfall coastal zone or a dry desert environment, we’ll design a SWPPP that fits your site and your permit.
Transparent Pricing and No Hidden Fees
You’ll get a clear, flat-rate quote before you order. No surprise charges, no hourly billing, no change orders. You pay one price for a complete, compliant SWPPP, delivered on time. And if you need updates or revisions during construction, we offer ongoing support and plan amendments at a fair, predictable cost.
Support When You Need It
SWPPP compliance doesn’t end when we deliver your plan. Our team is available to answer questions, help with inspector requests, and provide guidance on BMP installation and maintenance. If you need training for your field crew or help responding to an enforcement action, we’re here. Get a free SWPPP estimate or learn more about our team to see why contractors trust Pro SWPPP.
We’ve built our reputation on delivering professional SWPPPs that keep your project compliant and on schedule. When you work with Pro SWPPP you’re working with a partner who understands construction, respects your timeline, and gets the job done right the first time.
FAQ
Do I need a SWPPP for a small apartment building on a half-acre lot?
It depends on whether your project is part of a larger common plan of development. If your half-acre lot is part of a master-planned community or phased multifamily development where the total disturbance across all phases is one acre or more, then yes, you need a SWPPP and permit coverage. If your lot is truly standalone and the total disturbance is under one acre, federal NPDES rules may not apply, but check local city or county ordinances because many jurisdictions require erosion control plans for projects under one acre.
Who is responsible for the SWPPP: the owner or the contractor?
Under NPDES rules, the “operator” is responsible for obtaining permit coverage and implementing the SWPPP. An operator is anyone who has operational control over construction plans and specifications or day-to-day operations at the site. For multifamily projects, this can be the owner, the general contractor, or both. Typically, the general contractor is listed as the operator and is responsible for SWPPP compliance, but the contract should spell out who is responsible for preparing, implementing, and updating the SWPPP. Make sure your contract is clear before you start work.
Can I start construction before my SWPPP is approved?
In most states, you must have permit coverage (NOI submitted and fee paid) and a complete SWPPP in place before you begin any land-disturbing activity. Some states issue automatic coverage upon NOI submission, while others require agency review and approval before coverage is granted. Check your state’s rules and allow time for processing. Starting construction before you have coverage is a violation, even if your SWPPP is complete.
How long does a SWPPP remain in effect?
Your SWPPP and permit coverage remain in effect until you achieve final stabilization across the entire site and submit a Notice of Termination (NOT) to the permitting authority. Final stabilization typically means establishing permanent vegetation or other non-erosive surface on all disturbed areas and completing all construction activities. For multifamily projects, this usually happens when all buildings, parking, landscaping, and stormwater controls are complete and the site is ready for occupancy.
What is the penalty for not having a SWPPP when required?
Penalties vary by state and the severity of the violation, but the Clean Water Act authorizes civil penalties up to tens of thousands of dollars per day of violation. In addition to fines, you may face stop-work orders, corrective action requirements, and project delays. For a multifamily project, the total cost of an enforcement action (including fines, delays, and legal fees) can easily exceed six figures. The cost of compliance is always lower than the cost of a violation.
Can I use the same SWPPP for multiple phases of a multifamily development?
If all phases are part of the same common plan of development, you can prepare a single SWPPP that covers the entire development, but you must update the SWPPP as each phase is constructed. Alternatively, you can prepare a master SWPPP for the overall development and separate phase-specific SWPPPs for each construction phase. Either approach is acceptable as long as each operator has permit coverage and a SWPPP that accurately reflects the work they are responsible for.
Do I need separate permits for construction stormwater and post-construction stormwater?
It depends on your state and local jurisdiction. The construction stormwater permit (CGP or state equivalent) covers stormwater discharges during construction. Post-construction stormwater requirements (permanent stormwater controls for new impervious surfaces) are often regulated separately under local MS4 ordinances or state post-construction stormwater rules. Many jurisdictions require you to submit a post-construction stormwater management plan as part of your site plan or grading permit application. Check with your local stormwater authority to understand both construction and post-construction requirements.
Ready to get started? Order your SWPPP now or schedule a free consultation with Pro SWPPP.
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By Derek E. Chinners, CPESC — Founder & Stormwater Consultant, Pro SWPPP, LLC
Related: What Is a SWPPP? · When Is a SWPPP Required? The 1-Acre Rule and Common Plans · Texas SWPPP Requirements (SWP3) · Georgia SWPPP Requirements