Clean Water Act discharge permit · NPDES KY0090590
CLARKSON STP, Clarkson, KY: NPDES KY0090590 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 11Pollutants under a numeric limit
- 9Pollutants with an effluent exceedance
CLARKSON STP, held by Clarkson STP, holds NPDES permit KY0090590, which discharges to Barton Run. EPA’s file records it issued April 24, 2015 and expiring May 31, 2020. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | CLARKSON STP |
|---|---|
| Permittee as filed | Clarkson STP |
| NPDES ID | KY0090590 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | April 24, 2015 |
| Expiration date | May 31, 2020 |
| Address | Clarkson, KY 42726 |
| Receiving water | BARTON RUN |
| Subwatershed | Lower Clifty Creek (HUC 051100040105) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 17Pollutants on file
- 11Under a numeric limit
- 17With a violation of any kind
- 9With an effluent exceedance
An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| Nitrogen, ammonia total [as N] | 8 | 544 | 308 | June 30, 2026 | 3,225% over the limit |
| Solids, total suspended | 8 | 518 | 166 | June 30, 2026 | 1,600% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 8 | 480 | 110 | June 30, 2026 | 838% over the limit |
| E. coli | 2 | 130 | 76 | May 31, 2026 | 24,900% over the limit |
| Solids, suspended percent removal | 1 | 97 | 54 | June 30, 2026 | 567% over the limit |
| Oxygen, dissolved [DO] | 1 | 94 | 49 | July 31, 2026 | 97% over the limit |
| BOD, carb-5 day, 20 deg C, percent removal | 1 | 67 | 21 | March 31, 2025 | 167% over the limit |
| Coliform, fecal general | 0 | 54 | 14 | April 30, 2009 | 99,999% over the limit |
| pH | 2 | 105 | 11 | July 31, 2026 | |
| Flow, in conduit or thru treatment plant | 4 | 204 | 0 | ||
| Phosphorus, total [as P] | 2 | 102 | 0 | ||
| Nitrogen, total [as N] | 2 | 62 | 0 | ||
| Hardness, total [as CaCO3] | 0 | 2 | 0 | ||
| Zinc, total recoverable | 0 | 2 | 0 | ||
| Cadmium, total recoverable | 0 | 2 | 0 | ||
| Lead, total recoverable | 0 | 2 | 0 | ||
| Copper, total recoverable | 0 | 2 | 0 |
Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.
Inspections, violations and enforcement
- 7Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| May 13, 2019 | Management Practice Violations - Improper Operation and Maintenance | ST6 |
| May 13, 2019 | Effluent Violations - Narrative Effluent Violation | ST6 |
| May 2, 2019 | Effluent Violations - Narrative Effluent Violation | ST6 |
| May 2, 2019 | Management Practice Violations - Improper Operation and Maintenance | ST6 |
| February 11, 2019 | Monitoring Violations - No Flow Measurement Device | ST6 |
| February 11, 2019 | Management Practice Violations - Improper Operation and Maintenance | ST6 |
| February 11, 2019 | Reporting Violations - Failure to Notify | ST6 |
Velarion’s copy of EPA’s ICIS-NPDES files does not yet include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.
Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.
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EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID KY0090590 there.
Nearby on the register
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- Every permit record in Kentucky, A to Z
Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.