Clay County, MO Environmental Rules: Erosion Control (2026)
Key Facts
- State permit trigger
- 1+ acre disturbed, or smaller if part of larger plan
- State permit type
- MO-RAxxxxx Land Disturbance Stormwater General Permit
- State fee range
- $500 (under 5 ac) to $5,000 (500+ ac)
- County LDP fee
- $150 (1-5 ac) to $750 (21+ ac)
- County inspection fee
- $200 per erosion/sediment inspection
- Local violation fine
- $10-$1,000 per violation, LDC § 151-8.19(N)
- Current state permit expires
- February 7, 2027
Summary
Any construction project in unincorporated Clay County that disturbs one acre or more, or less than an acre as part of a larger development plan totaling an acre or more, needs a Missouri DNR land disturbance stormwater permit plus a written stormwater pollution prevention plan before grading starts, on top of the county's own land disturbance permit fee.
Land disturbance activities include clearing, grubbing, excavating, grading, filling and other activities that result in the destruction of the root zone and/or land disturbance activity that is reasonably certain to cause pollution to waters of the state. Land disturbance permits are required for construction disturbance activities of one or more acres or construction activities that disturb less than one acre when part of a larger common plan of development or sale that will disturb a cumulative total of one or more acres over the life of the project. The main requirement of a land disturbance permit is developing a stormwater pollution prevention plan (SWPPP) that includes site-specific best management practices (BMPs) to minimize soil exposure, soil erosion and pollutant discharge.
Full Breakdown
Missouri's Land Disturbance Stormwater General Permit program covers clearing, grubbing, excavating, grading and filling: any activity that destroys the root zone or is reasonably certain to pollute state waters. The trigger is one acre or more disturbed, or a smaller footprint that is part of a larger common plan of development or sale reaching one acre cumulatively over the project's life. The core obligation is a site-specific Stormwater Pollution Prevention Plan (SWPPP) with best management practices to hold down soil exposure, erosion and pollutant discharge before it leaves the site.
Individual sites apply through the state's ePermitting/MoGEM portal for an MO-RAxxxxx permit; a separate MO-R100xxx Area-Wide permit exists only for a city, county, state or federal agency managing land disturbance across multiple sites, such as county road or park construction. State fees run from $500 for under 5 acres up to $5,000 for 500 acres or more, and the current general permit is set to expire February 7, 2027, after which a new application (not a renewal) is required. Locally, Clay County layers its own control on top of the state permit: the Planning & Zoning Department charges a county Land Disturbance Permit fee of $150 for 1-5 acres, $350 for 6-20 acres and $750 for 21 acres or more, plus a $200 fee for each erosion and sediment control construction inspection, under the county's Appendix A fee schedule.
A builder working in the unincorporated county needs both the state general permit and the county's own inspection sign-off; skipping either exposes the project to separate state and county enforcement.
Violations & Fines
Clay County's fee schedule sets a civil fine of $10 to $1,000 for each violation of the erosion and sediment control standard in Land Development Code § 151-8.19(N), with the exact amount set by the Planning & Zoning Director based on severity. That penalty is separate from state enforcement: building or grading without the required MO-RAxxxxx or MO-R100xxx general permit, or without an approved SWPPP, exposes the site operator to compliance action from DNR's Water Protection Program under the general permit's own terms.
Frequently Asked Questions
Do I need a state permit for less than one acre of grading in Clay County?
What has to be in a Missouri stormwater pollution prevention plan?
Does Clay County require its own permit on top of the state one?
What is the penalty for skipping erosion control requirements in unincorporated Clay County?
Sources & Official References
Other rules in Clay County
Compare Clay County to another location·View the Missouri environmental rules overview
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