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
- 0Inspections on file
- 0Formal enforcement actions
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.
CLARKSON STP, Clarkson, Kentucky: Individual permit KY0090590, held by Clarkson STP; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued April 24, 2015, term to May 31, 2020; discharges to BARTON RUN; Sewage Treatment Facilities.
- Nitrogen, ammonia total [as N]: 8 limits, 544 violations of any kind, 308 effluent exceedances, latest June 30, 2026, largest 3,225% over the limit.
- Solids, total suspended: 8 limits, 518 violations of any kind, 166 effluent exceedances, latest June 30, 2026, largest 1,600% over the limit.
- BOD, carbonaceous [5 day, 20 C]: 8 limits, 480 violations of any kind, 110 effluent exceedances, latest June 30, 2026, largest 838% over the limit.
- E. coli: 2 limits, 130 violations of any kind, 76 effluent exceedances, latest May 31, 2026, largest 24,900% over the limit.
- Solids, suspended percent removal: 1 limit, 97 violations of any kind, 54 effluent exceedances, latest June 30, 2026, largest 567% over the limit.
- Oxygen, dissolved [DO]: 1 limit, 94 violations of any kind, 49 effluent exceedances, latest July 31, 2026, largest 97% over the limit.
- BOD, carb-5 day, 20 deg C, percent removal: 1 limit, 67 violations of any kind, 21 effluent exceedances, latest March 31, 2025, largest 167% over the limit.
- Coliform, fecal general: 0 limits, 54 violations of any kind, 14 effluent exceedances, latest April 30, 2009, largest 99,999% over the limit.
- pH: 2 limits, 105 violations of any kind, 11 effluent exceedances, latest July 31, 2026.
- Flow, in conduit or thru treatment plant: 4 limits, 204 violations of any kind, 0 effluent exceedances.
- Phosphorus, total [as P]: 2 limits, 102 violations of any kind, 0 effluent exceedances.
- Nitrogen, total [as N]: 2 limits, 62 violations of any kind, 0 effluent exceedances.
- Hardness, total [as CaCO3]: 0 limits, 2 violations of any kind, 0 effluent exceedances.
- Zinc, total recoverable: 0 limits, 2 violations of any kind, 0 effluent exceedances.
- Cadmium, total recoverable: 0 limits, 2 violations of any kind, 0 effluent exceedances.
- Lead, total recoverable: 0 limits, 2 violations of any kind, 0 effluent exceedances.
- Copper, total recoverable: 0 limits, 2 violations of any kind, 0 effluent exceedances.
- July 30, 2026: Notice of Violation (State).
- 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).
Kentucky holds 294 Publicly owned treatment works coverages of this permit type in EPA’s file; 61 were issued before KY0090590.
Coverages issued nearest KY0090590
- November 12, 2014: EAST CALLOWAY COUNTY ELEMENTARY SCHOOL, Murray, KY0040738, held by East Calloway County Elementary School
- November 26, 2014: MILLSTONE ALTERNATIVE TRMT SYS, Millstone, KY0103217, held by Millstone Alternative Trmt Sys
- December 5, 2014: SHELBYVILLE STP, Shelbyville, KY0020427, held by Shelbyville STP
- April 23, 2015: BARBOURVILLE STP, Barbourville, KY0024082, held by Barbourville STP
- April 24, 2015: TAYLORSVILLE STP, Taylorsville, KY0028142, held by Taylorsville STP
- May 5, 2015: CYNTHIANA STP (NEW), Cynthiana, KY0105856, held by Cynthiana STP New
- November 23, 2015: MAYSVILLE STP, Maysville, KY0020257, held by Maysville STP
- December 17, 2015: MUNFORDVILLE STP, Munfordville, KY0031755, held by Munfordville STP
- December 18, 2015: BENHAM STP, Benham, KY0025755, held by Benham STP
- December 18, 2015: LOYALL STP, Loyall, KY0026115, held by Loyall STP
CLARKSON STP among its neighbors
EPA’s permit file holds 3 discharge permits in the Lower Clifty Creek subwatershed (HUC 051100040105), KY0090590 among them. Its county holds 35, 1 of them major permits; KY0090590 is a minor permit.
Other permits in the Lower Clifty Creek subwatershed (HUC 051100040105)
- CID 25-1002 EXTEND THE WILLIAM THOMASON BYWAY (KY 3155), Leitchfield: KYR10T199, minor permit, discharging to Big Run Branch, permit term to December 31, 2029
- MTD PRODUCTS INC, Leitchfield: KYR003474, minor permit, permit term to May 31, 2018
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) |
| NAICS | 221320 – Sewage Treatment Facilities |
| SIC | 4952 – Sewerage Systems |
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 |
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 |
Inspections
EPA’s inspection file holds no inspection for NPDES KY0090590.
Formal enforcement and penalties
0 formal actions, 0 of them with a penalty assessed. Federal and state penalties are separate figures from separate authorities and are shown as each was filed, never added together.
Informal enforcement
| Date | What EPA recorded | Agency |
|---|---|---|
| July 30, 2026 | Notice of Violation | State |
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.