Silt Fence
Perimeter sediment control. Trenched 6 inches into the ground, backfilled and compacted, posts on the downhill side. Catches sediment from sheet flow before it leaves the site. Repaired or replaced when undermined or overtopped.
Educational Resources
SWPPP, BMPs &
Stormwater Compliance.
A plain-English reference on SWPPP requirements, common BMP types, and stormwater compliance basics in Kansas and Missouri — plus direct links to KDHE, Missouri DNR, and EPA NPDES Region 7. Not legal advice. Always consult your actual permit and your regulator for project-specific requirements.
SWPPP Basics
When You Need a SWPPP — and What It Covers.
A Stormwater Pollution Prevention Plan (SWPPP) is a site-specific written plan documenting how stormwater runoff, erosion, and sediment will be controlled on a construction site. It's required under the EPA's NPDES Construction General Permit for most construction projects disturbing one acre or more of land — and for smaller sites that are part of a larger common plan of development.
The SWPPP isn't a one-time document. It identifies the BMPs (Best Management Practices) that have to be installed, sets an inspection cadence, requires corrective action documentation, and is updated as site conditions change. It has to be kept on-site, accessible to regulators, and maintained from initial ground disturbance through final stabilization.
One-acre rule, with a catch: If your project disturbs less than an acre but is part of a "larger common plan of development or sale" (e.g., a phased subdivision, a multi-lot commercial pad), it still falls under the permit. This catches a lot of small builders by surprise.
BMP Reference
Common BMPs — What They Look Like, What They Do.
Best Management Practices (BMPs) are the physical controls a SWPPP requires to manage runoff, erosion, and sediment on a construction site. Below are the controls you'll most commonly see specified — installed correctly, maintained on schedule, and documented. Images are illustrative, not project photos.
Super Silt Fence
Reinforced silt fence with chain-link backing for higher-flow or steeper-slope conditions where standard fabric alone can't handle the load. Used where flow concentrates or slopes are too steep for standard silt fence to perform.
Inlet Protection
Filter fabric, gravel bags, or pre-fabricated inserts placed around or inside a storm drain inlet to capture sediment before it enters the storm system. Cleaned out before it gets overwhelmed — not after.
Slope Stabilization
Disturbed slopes seeded, then covered with erosion control blanket or anchored straw to hold soil in place while vegetation establishes. The longer a slope sits unstabilized, the higher the chance the next rain undoes the grading.
Straw Wattle / Fiber Roll
Lay-flat sediment control on slopes and around sensitive features like ponds. Slows runoff, captures fine sediment, and biodegrades. Used as a complement to silt fence — not a replacement.
Erosion Control Blanket
Biodegradable mat anchored over seeded ground on slopes or near water. Holds seed and soil through germination and the first rain events. Different weights and weave for different slope steepness and flow.
Rock Check Dam
Riprap structure placed across a drainage ditch or swale to slow flow, reduce velocity, and let sediment settle out. Sized to the flow it has to handle — undersized check dams blow out in the first real storm.
Diversion Ditch / Swale
A graded channel that routes clean upstream water around the disturbed area, keeping it out of the active site. Reduces the volume of stormwater that has to be managed, treated, and discharged. Essential on sites with significant offsite drainage.
Riprap Outlet Apron
Energy-dissipation rock placed at a culvert or swale discharge point. Without one, concentrated flow scours the soil at the outlet and creates an expanding erosion channel. Sized correctly to the expected discharge velocity.
Stabilized Construction Entrance
Rock pad at the site exit that knocks mud off tires before vehicles hit public roads. The most common cause of off-site track-out violations is an undersized or worn-out entrance pad. Replenished as it embeds into the ground.
Stabilized Soil Stockpile
Stockpiles of excavated material set back from drainage paths and ringed with silt fence or wattles, then seeded or covered if they'll sit more than 14 days. An unprotected stockpile is one rainstorm away from being the biggest sediment source on the site.
Erosion control vs. sediment control: Erosion control keeps soil from being detached in the first place (vegetation, mulch, blankets). Sediment control catches detached soil moving with runoff (silt fence, check dams, basins). A good site uses both — and prioritizes erosion control because it's cheaper and more effective than catching dirt after it's already moving.
Regulator & Permit Resources
Reliable Links for Your Project.
The agencies below administer construction stormwater permitting in our service area, plus the EPA Region 7 office that oversees both states. Bookmark the ones that apply to where you build.
Kansas
Kansas Department of Health and Environment (KDHE)
Administers Kansas's NPDES Construction Stormwater General Permit and statewide environmental compliance.
Missouri
Missouri Department of Natural Resources (MDNR)
Administers Missouri's Land Disturbance General Permit (the state's NPDES construction stormwater permit) and statewide environmental compliance.
Federal
EPA NPDES — Region 7
EPA Region 7 covers Kansas, Missouri, Iowa, and Nebraska. The Construction General Permit framework and national NPDES standards are documented here.
Local — KC Metro
Local Stormwater Ordinances
Many KC-metro municipalities have additional stormwater ordinances on top of state requirements. Check directly with the jurisdiction your project is in.
Technical Reference
BMP Design References
For BMP design specifics, sizing, and installation standards. These are the references engineers and inspectors typically cite.
Spill / Incident
Spill & Release Reporting
If you have an active spill or release, the regulator wants to hear about it from you — not later, and not from someone else.
Links provided for reference. Agency websites change; if a link is broken, the agency homepage is the most reliable starting point. None of the above is legal advice — always consult your actual permit and a qualified professional for project-specific compliance decisions.
Glossary
Stormwater Terms, Translated.
A short reference for the acronyms and terms that show up in SWPPP plans, permits, and regulator correspondence.
- SWPPP
- Stormwater Pollution Prevention Plan. The site-specific written plan documenting how stormwater runoff, erosion, and sediment will be controlled on a construction site.
- NPDES
- National Pollutant Discharge Elimination System. The federal program (delegated to states like KDHE and MDNR) that regulates point-source discharges to waters of the U.S.
- BMP
- Best Management Practice. The physical or procedural controls used to prevent or reduce pollution from runoff — silt fence, inlet protection, blankets, wattles, check dams, etc.
- NOV
- Notice of Violation. A formal regulatory letter identifying compliance failures and requiring corrective action. Faster and cheaper to respond to than ignore.
- NOI / NOT
- Notice of Intent / Notice of Termination. The application to obtain coverage under a general permit (NOI) and the form filed to end that coverage once the site is stabilized (NOT).
- Qualifying Rain Event
- A storm event large enough (typically 0.5 inch in 24 hours, varies by permit) to trigger a required post-rain SWPPP inspection within 24 hours.
- Final Stabilization
- The condition that allows a site to terminate permit coverage — typically 70% uniform vegetative cover (or equivalent stabilization) over all disturbed areas.
- Common Plan of Development
- A larger project being developed in pieces, even by different builders. Sites under one acre that are part of a common plan still need permit coverage.
- Inlet Protection
- BMP placed around a storm drain inlet to capture sediment before it enters the storm system. Cleaned out before it gets overwhelmed — not after.
- Dewatering
- Removing accumulated water from an excavation or low area. Discharge water has to be controlled for sediment before it leaves the site — usually with a dewatering bag, settling tank, or filter setup.
Frequently Asked
Compliance Questions, Answered Plainly.
Who regulates SWPPP and stormwater compliance in Kansas?
The Kansas Department of Health and Environment (KDHE) administers the NPDES Construction Stormwater General Permit under delegation from the EPA. Most construction sites disturbing one acre or more (or smaller sites that are part of a larger common plan of development) must obtain coverage and maintain a SWPPP.
Some local municipalities — Olathe, Overland Park, Lenexa, Shawnee, and others — have additional stormwater ordinances on top of KDHE requirements.
Who regulates SWPPP and stormwater compliance in Missouri?
The Missouri Department of Natural Resources (MDNR) administers the Land Disturbance General Permit — Missouri's version of the NPDES Construction Stormwater permit. Coverage is required for most construction sites disturbing one acre or more.
The Kansas City metro spans both states, so projects near the state line may have to consider both KDHE and MDNR requirements depending on where the disturbance occurs.
What is the difference between erosion control and sediment control?
Erosion control prevents soil from being detached in the first place — vegetation, mulch, erosion control blankets, slope stabilization, soil binders.
Sediment control captures soil that has already been detached and is moving with stormwater runoff — silt fence, sediment traps, check dams, inlet protection.
A good site uses both, with erosion control prioritized because it's cheaper and more effective. Sediment control is the safety net for what gets through.
How often does a SWPPP inspection have to happen?
Under the standard NPDES Construction General Permit framework, qualified personnel inspect the site at least once every seven calendar days, and within 24 hours of a qualifying rain event (typically 0.5 inch or greater — varies by permit).
Each inspection requires a documented report, photos, and any corrective actions identified and tracked through completion. Specific cadence varies by state and by permit — check your actual permit, not just the general rule.
Do I really need a SWPPP for a small site?
If you're disturbing less than an acre and you're not part of a larger common plan of development, generally no. But "common plan" is broad — a phased subdivision, a multi-lot commercial pad, or a project being built in pieces all qualify, even if each phase is under an acre.
Local ordinances may also impose stormwater requirements on smaller sites. Always check with the jurisdiction first.
Need Help Implementing Any of This?
We Handle the SWPPP, Inspections, and BMP Work in the Field.
Educational reference is here for free. When you need it actually executed on a site — call.