10109Construction General Permit (CGP) Compliance Guide for 2026You’re about to break ground on a construction project. You’re excited. Then someone mentions stormwater permits, SWPPPs, and NOIs. Your head spins. You think, “Do I really need all this?” Short answer: probably yes. And Pro SWPPP – America’s #1 SWPPP Service is here to make it simple. Let’s cut through the confusion and figure out exactly what you need based on where you’re building.
What Is a Construction General Permit and Why Should You Care?
The Clean Water Act is federal law. It says you can’t dump polluted water into rivers, lakes, or streams. When you dig dirt, it rains, and mud runs off your site—that’s stormwater discharge. If you disturb one acre or more (or less than one acre if it’s part of a bigger project), you need a Construction General Permit (CGP). This permit lives under the National Pollutant Discharge Elimination System, or NPDES for short. Think of the CGP as your ticket to legally discharge stormwater. Without it, you’re breaking federal law. The EPA can fine you. Your state can shut you down. Nobody wants that. Here’s the kicker: most states run their own NPDES programs. That means your state writes the rules, not just the EPA. So what you need in Texas is different from what you need in Georgia. Let’s break it down state by state so you know exactly what to do.Do You Need a SWPPP or an NOI? (Or Both?)
SWPPP stands for Stormwater Pollution Prevention Plan. It’s a written document that explains how you’ll keep dirt and chemicals out of the water. You list your Best Management Practices (BMPs)—things like silt fences, erosion control blankets, and sediment basins. You describe your site, your soil, your slopes, and your plan to stabilize everything when you’re done. NOI stands for Notice of Intent. It’s a form you file with your state (or the EPA) telling them, “Hey, I’m starting construction, and I’m going to follow my SWPPP.” Think of the NOI as the official handshake. The SWPPP is the blueprint. In almost every state, if you need a CGP, you need both. You write the SWPPP first, then you submit the NOI. But the exact process and timing change depending on where you are. Let’s look at some key states.
State-by-State Breakdown: What You Actually Need
Texas (TXR150000 Permit)
If you’re building in Texas, you’re under the Texas Commission on Environmental Quality, or TCEQ. The current permit is TXR150000, effective March 5, 2023. You need a SWPPP (called a SWP3 in Texas—same thing, fancier name). You must submit your NOI before you disturb the ground. You also need to post a site notice visible from the road showing your permit number and contact info. Texas is hot. Dirt dries fast. But when storms hit, they hit hard. Your erosion control better be tight. Inspections are required weekly and within 24 hours after any storm that causes runoff. Miss an inspection? That’s a violation.Georgia
Georgia runs its own NPDES program through the Georgia Environmental Protection Division. If you disturb one acre or more, you file an NOI and prepare a SWPPP. Georgia requires you to designate a qualified person to oversee erosion and sediment control. That person must be on-site or available to inspect regularly. Georgia gets a lot of rain, especially in summer. Sediment control is critical. Silt fences, check dams, and stabilized construction exits are standard. You must keep records of inspections and maintenance. If you can’t prove you did the work, you didn’t do the work in the eyes of the regulators.California
California takes stormwater seriously. Their CGP requires a Qualified SWPPP Developer (QSD) to write your plan and a Qualified SWPPP Practitioner (QSP) to oversee it. You can’t just wing it. You need certified professionals. The NOI goes to the State Water Resources Control Board. You must also submit a Risk Level Assessment and follow specific training requirements. California’s rules are strict. They’ve fined projects tens of thousands of dollars for missing inspections or failing to update SWPPPs after site changes. One container terminal in California got hit with a $47,100 fine for inadequate BMPs and incomplete documentation. Don’t be that project.Washington
Washington’s CGP expires December 31, 2025. A new one kicks in January 1, 2026, and runs through 2030. You must apply for coverage at least 60 days before you start discharging stormwater. That means plan ahead. You need a SWPPP on-site at all times. Weekly inspections are required, plus inspections within 24 hours after any storm. Washington’s wet season runs from October through April. Erosion risk is high. Your SWPPP must address seasonal conditions. Vegetated stabilization and mulch are common BMPs. If you’re in a Total Maximum Daily Load (TMDL) area, you have extra restrictions.Louisiana (LAR100000)
Louisiana’s permit, LAR100000, covers large construction sites and support activities. You file an NOI with the Louisiana Department of Environmental Quality. Your SWPPP must address site-specific conditions, including soil type and proximity to water bodies. Louisiana also requires you to check if your project is in a TMDL watershed. If it is, you may need extra controls. Louisiana has flat terrain and heavy rainfall. Sediment basins and diversion ditches are your friends. Keep them clean and functional, or you’ll have muddy water running straight into bayous and wetlands.Other States
Most other states follow a similar pattern: SWPPP first, NOI second, inspections weekly and after storms. Some states have online portals for NOI submission. Some still use paper forms. Check your state environmental agency website or talk to a certified professional. Pro SWPPP knows the rules in all 50 states and can tell you exactly what you need. Don’t want to mess with all the paperwork and requirements? Check out Order your SWPPP now with Pro SWPPP Professional CPESC Certified SWPPP Services.
Key Components Every SWPPP Must Include
No matter what state you’re in, your SWPPP needs these core pieces:- Site Description: Location, size, soil type, slopes, existing vegetation, nearby water bodies.
- Construction Activities: What you’re building, when you’re building it, phases of work.
- BMPs: Specific controls for erosion (like mulch, mats, seeding) and sediment (like silt fences, sediment traps, inlet protection).
- Inspection Schedule: Who inspects, how often, what they check, how they document it.
- Maintenance Plan: How you’ll repair or replace BMPs when they fail.
- Spill Prevention: Where you store fuel, oil, concrete, and how you prevent spills.
- Final Stabilization: How you’ll stabilize the site when construction is done so vegetation can grow and erosion stops.
Best Management Practices: What Actually Works
BMPs are the tools you use to keep dirt on your site and out of the water. Here are the most common and effective ones:- Silt Fence: Fabric barrier that traps sediment. Install it before you disturb soil. Check it after every rain. Replace torn sections immediately.
- Erosion Control Blankets: Roll them out on slopes to hold soil in place while grass grows.
- Sediment Basins: Ponds that collect runoff and let sediment settle before water leaves the site. Size them for your site’s runoff volume.
- Check Dams: Small barriers in ditches that slow water and trap sediment. Use rock or sandbags.
- Stabilized Construction Exit: Gravel pad where trucks leave the site, shaking off mud before they hit the road.
- Inlet Protection: Filters around storm drains to catch sediment before it enters the drainage system.
- Dust Control: Water trucks or mulch to keep dry dirt from blowing off-site.