KYState-AdministeredSWPPP Requirements in Kentucky
Kentucky administers its construction stormwater program through the Kentucky Pollutant Discharge Elimination System (KPDES) under the KYR10 general permit. The state's most distinctive environmental challenge is its karst geology—Kentucky contains more mapped karst terrain than any other state east of the Mississippi. Sinkholes, caves, and disappearing streams create direct hydraulic connections between surface construction activity and groundwater systems that supply drinking water and support cave ecosystems including globally rare invertebrates. SWPPPs for karst sites require provisions specifically addressing sinkhole risk, including gravel-filled sinkhole protection rings and dewatering management. Eastern Kentucky's Appalachian Plateau presents a different set of challenges: steep terrain, acidic soils from coal measure geology, and proximity to legacy surface mine sites create erosion and water quality risks that standard SWPPP templates don't fully address. The Mammoth Cave National Park watershed in Barren and Hart counties is designated a special protection area under state and federal law, meaning construction activity near the watershed boundary receives heightened regulatory scrutiny.
Kentucky SWPPP Key Facts
- ✓Kentucky has more mapped karst terrain east of the Mississippi than any other state—karst-specific SWPPP provisions required in those areas
- ✓Mammoth Cave National Park watershed designated special protection area in south-central Kentucky
- ✓Eastern Kentucky coal measure geology creates acidic soils that complicate revegetation and BMP performance
- ✓KPDES permit KYR100000 ($0 NOI fee) tracks federal CGP structure with Kentucky-specific karst provisions
- ✓Louisville and Lexington metro areas have active MS4 programs with requirements beyond the KYR10 baseline
Administering Agency
- Agency
- Kentucky Energy and Environment Cabinet, Division of Water (KY DOW)
- Phone
- 502-564-3410
- dow.info@ky.gov
- Website
- KY DOW Stormwater Program
Permit Details
- Permit Name
- KPDES General Permit for Stormwater Discharges Associated with Construction Activities
- Permit Number
- KYR100000
- Effective Date
- 2025-01-03
- Expiration Date
- 2029-12-31
- Permit Document
- View Current Permit
SWPPP Thresholds & Triggers
- Acreage Threshold
- 1 acre of land disturbance, or less than 1 acre if part of a larger common plan of development
Kentucky's extensive karst geology (sinkholes, caves, disappearing streams) creates direct conduits between surface stormwater and groundwater. Projects in karst terrain require karst-specific SWPPP provisions. The Mammoth Cave National Park watershed in south-central Kentucky is designated a special protection area.
Inspection Requirements
- Inspection Frequency
- At least once every 7 calendar days and within 24 hours of a qualifying storm event of 0.5 inch or more
- Rain Event Threshold
- 0.5 inch in a 24-hour period
- Certified Inspector
- Not required by state
Kentucky's coal mining legacy in the eastern coalfields (Appalachian Plateau) creates overlapping stormwater and acid mine drainage compliance requirements. Construction projects in eastern Kentucky may encounter legacy mining spoil or acidic soils requiring special BMP provisions beyond standard erosion controls.
Penalties & Enforcement
- Max Civil Penalty (Per Day)
- $25,000 per day per violation
- Criminal Penalties
- Criminal penalties under KRS 224.99 for knowing violations
KY DOW enforces KPDES permits and coordinates with the Kentucky Division of Mine Reclamation and Enforcement in eastern Kentucky where construction and mining stormwater issues overlap.
Permit Fees
- NOI Filing Fee
- $0
- NOT Filing Fee
- $0
How Kentucky Differs from Federal Requirements
- ⚠Kentucky's karst-specific SWPPP requirements are a state-specific addition not addressed in the federal CGP baseline.
- ⚠Mammoth Cave watershed special protection area designation imposes additional review requirements beyond the federal CGP.
- ⚠$0 NOI fee in Kentucky; federal CGP may charge processing fees in non-authorized states.
SWPPP Tips for Kentucky
- ➤Before preparing your SWPPP in central or south-central Kentucky, check the Kentucky Geological Survey karst map—if your site is in mapped karst, add sinkhole identification and protection provisions to your SWPPP.
- ➤Eastern Kentucky projects near legacy surface mine areas: test soils for acidity before specifying seed mixes—standard cool-season grasses often fail on high-pH or acidic post-mine soils.
- ➤For Mammoth Cave watershed projects, contact KY DOW early to understand any additional review requirements for projects in the special protection area.
- ➤Louisville and Lexington both operate MS4 programs—check local stormwater ordinances before finalizing your SWPPP for metro area projects.
Kentucky SWPPP FAQs
What is karst terrain and why does it matter for my SWPPP?+
Karst is a landscape formed from soluble bedrock (limestone, dolomite) that creates sinkholes, caves, and underground drainage. In Kentucky karst areas, stormwater that enters a sinkhole can travel directly to springs and groundwater—bypassing all surface BMPs. SWPPPs in karst terrain must address sinkhole identification, protection, and prevention of construction materials from entering karst features.
Does the Mammoth Cave watershed have special stormwater requirements?+
Yes. The Mammoth Cave National Park watershed is a designated special protection area. Projects in or near this watershed may face additional review by KY DOW and NPS. Contact KY DOW before submitting your NOI if your site is in Barren, Hart, Edmonson, or adjacent counties.
How does coal mining affect stormwater compliance in eastern Kentucky?+
Legacy surface mines, highwalls, and spoil piles in eastern Kentucky can contain acidic or selenium-laden soils that affect BMP performance and receiving water quality. Construction projects disturbing these materials may need acid mine drainage provisions in their SWPPP and coordination with the Division of Mine Reclamation and Enforcement.
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