Clean Water Act discharge permit · NPDES KY0109991
WILLIAMSTOWN REGIONAL WRF, Williamstown, KY: NPDES KY0109991 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 121Pollutants under a numeric limit
- 8Pollutants with an effluent exceedance
- 3Inspections on file
- 0Formal enforcement actions
WILLIAMSTOWN REGIONAL WRF, held by Williamstown Regional WRF, holds NPDES permit KY0109991, which discharges to Clarks Crk. EPA’s file records it issued October 5, 2017 and expiring November 30, 2022.
WILLIAMSTOWN REGIONAL WRF, Williamstown, Kentucky: Individual permit KY0109991, held by Williamstown Regional WRF; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued October 5, 2017, term to November 30, 2022; discharges to CLARKS CRK.
- E. coli: 2 limits, 43 violations of any kind, 41 effluent exceedances, latest June 30, 2026, largest 3,022% over the limit.
- Nitrogen, ammonia total [as N]: 4 limits, 43 violations of any kind, 35 effluent exceedances, latest September 30, 2024, largest 1,640% over the limit.
- Copper, total recoverable: 8 limits, 25 violations of any kind, 17 effluent exceedances, latest December 31, 2019, largest 3,674% over the limit.
- Di[2-ethylhexyl] phthalate [DEHP]: 4 limits, 15 violations of any kind, 11 effluent exceedances, latest October 31, 2018, largest 863,536% over the limit.
- Solids, suspended percent removal: 1 limit, 11 violations of any kind, 10 effluent exceedances, latest January 31, 2025, largest 267% over the limit.
- BOD, carbonaceous [5 day, 20 C]: 6 limits, 17 violations of any kind, 7 effluent exceedances, latest May 31, 2022, largest 133% over the limit.
- Solids, total suspended: 6 limits, 10 violations of any kind, 2 effluent exceedances, latest February 28, 2015, largest 58% over the limit.
- Oxygen, dissolved [DO]: 1 limit, 2 violations of any kind, 1 effluent exceedance, latest July 31, 2022, largest 3% over the limit.
- Phosphorus, total [as P]: 10 limits, 10 violations of any kind, 0 effluent exceedances.
- Zinc, total recoverable: 8 limits, 8 violations of any kind, 0 effluent exceedances.
- Oil & Grease: 6 limits, 8 violations of any kind, 0 effluent exceedances.
- Cyanide, free [amenable to chlorination]: 6 limits, 8 violations of any kind, 0 effluent exceedances.
- Arsenic, total recoverable: 6 limits, 8 violations of any kind, 0 effluent exceedances.
- Selenium, total recoverable: 6 limits, 8 violations of any kind, 0 effluent exceedances.
- Nickel, total recoverable: 6 limits, 8 violations of any kind, 0 effluent exceedances.
- Silver total recoverable: 6 limits, 8 violations of any kind, 0 effluent exceedances.
- Cadmium, total recoverable: 6 limits, 8 violations of any kind, 0 effluent exceedances.
- Lead, total recoverable: 6 limits, 8 violations of any kind, 0 effluent exceedances.
- Chromium, total recoverable: 6 limits, 8 violations of any kind, 0 effluent exceedances.
- Mercury, total recoverable: 6 limits, 8 violations of any kind, 0 effluent exceedances.
- Hardness, total [as CaCO3]: 4 limits, 6 violations of any kind, 0 effluent exceedances.
- Chloride [as Cl]: 4 limits, 4 violations of any kind, 0 effluent exceedances.
- Iron, total recoverable: 4 limits, 4 violations of any kind, 0 effluent exceedances.
- Phenolics, total: 4 limits, 4 violations of any kind, 0 effluent exceedances.
- Flow, in conduit or thru treatment plant: 4 limits, 4 violations of any kind, 0 effluent exceedances.
- Chromium, hexavalent tot recoverable: 4 limits, 4 violations of any kind, 0 effluent exceedances.
- Temperature, water deg. fahrenheit: 2 limits, 4 violations of any kind, 0 effluent exceedances.
- Thallium, total recoverable: 2 limits, 4 violations of any kind, 0 effluent exceedances.
- Beryllium, total recoverable [as Be]: 2 limits, 4 violations of any kind, 0 effluent exceedances.
- Antimony, total recoverable: 2 limits, 4 violations of any kind, 0 effluent exceedances.
- Dichlorobromomethane: 2 limits, 4 violations of any kind, 0 effluent exceedances.
- Carbon tetrachloride: 2 limits, 4 violations of any kind, 0 effluent exceedances.
- 1,2-Dichloroethane: 2 limits, 4 violations of any kind, 0 effluent exceedances.
- Bromoform: 2 limits, 4 violations of any kind, 0 effluent exceedances.
- Chloroform: 2 limits, 4 violations of any kind, 0 effluent exceedances.
- Toluene: 2 limits, 4 violations of any kind, 0 effluent exceedances.
- Benzene: 2 limits, 4 violations of any kind, 0 effluent exceedances.
- Acenaphthylene: 2 limits, 4 violations of any kind, 0 effluent exceedances.
- Acenaphthene: 2 limits, 4 violations of any kind, 0 effluent exceedances.
- Acrolein: 2 limits, 4 violations of any kind, 0 effluent exceedances.
- Acrylonitrile: 2 limits, 4 violations of any kind, 0 effluent exceedances.
- Anthracene: 2 limits, 4 violations of any kind, 0 effluent exceedances.
- Benzo[k]fluoranthene: 2 limits, 4 violations of any kind, 0 effluent exceedances.
- Benzo[a]pyrene: 2 limits, 4 violations of any kind, 0 effluent exceedances.
- Bis[2-chloroethyl] ether: 2 limits, 4 violations of any kind, 0 effluent exceedances.
- Bis[2-chloroethoxy]methane: 2 limits, 4 violations of any kind, 0 effluent exceedances.
- Bis[2-chloroisopropyl] ether: 2 limits, 4 violations of any kind, 0 effluent exceedances.
- Butyl benzyl phthalate: 2 limits, 4 violations of any kind, 0 effluent exceedances.
- Chlorobenzene: 2 limits, 4 violations of any kind, 0 effluent exceedances.
- Chlorodibromomethane: 2 limits, 4 violations of any kind, 0 effluent exceedances.
- Chrysene: 2 limits, 4 violations of any kind, 0 effluent exceedances.
- Diethyl phthalate: 2 limits, 4 violations of any kind, 0 effluent exceedances.
- Dimethyl phthalate: 2 limits, 4 violations of any kind, 0 effluent exceedances.
- 1,2-Diphenylhydrazine: 2 limits, 4 violations of any kind, 0 effluent exceedances.
- Ethylbenzene: 2 limits, 4 violations of any kind, 0 effluent exceedances.
- Fluoranthene: 2 limits, 4 violations of any kind, 0 effluent exceedances.
- Fluorene: 2 limits, 4 violations of any kind, 0 effluent exceedances.
- Hexachlorocyclopentadiene: 2 limits, 4 violations of any kind, 0 effluent exceedances.
- Hexachloroethane: 2 limits, 4 violations of any kind, 0 effluent exceedances.
- Indeno[1,2,3-cd]pyrene: 2 limits, 4 violations of any kind, 0 effluent exceedances.
- October 27, 2026: Evaluation (S).
- August 25, 2026: Evaluation (S).
- March 12, 2026: Audit (S).
- August 19, 2025: Effluent Violations - Narrative Effluent Violation (ST6).
- August 1, 2023: Effluent Violations - Failed Toxicity Test (ST6).
- June 3, 2019: Reporting Violations - Failure to Notify (ST6).
- June 3, 2019: Management Practice Violations - Improper Operation and Maintenance (ST6).
- June 3, 2019: Effluent Violations - Narrative Effluent Violation (ST6).
Kentucky holds 294 Publicly owned treatment works coverages of this permit type in EPA’s file; 128 were issued before KY0109991.
Coverages issued nearest KY0109991
- August 8, 2017: RIVERVIEW VILLAGE HOUSING COMP, Thelma, KY0044113, held by Riverview Village Housing Comp
- August 17, 2017: GARRISON REGIONAL WWTP, Garrison, KY0105422, held by Garrison Regional WWTP
- September 11, 2017: ELKTON STP, Elkton, KY0023442, held by Elkton STP
- September 11, 2017: SOUTH 641 WATER DISTRICT, Hazel, KY0028371, held by South 641 Water District
- September 11, 2017: EVARTS STP #2, Verda, KY0077615, held by Evarts STP #2
- October 6, 2017: ELKHORN CITY STP, Elkhorn City, KY0020958, held by Elkhorn City STP
- October 12, 2017: LEWISBURG WWTP, Lewisburg, KY0024881, held by Lewisburg WWTP
- October 17, 2017: CANEYVILLE STP, Caneyville, KY0072044, held by Caneyville STP
- October 26, 2017: ETHANS GLEN WWTP, Burlington, KY0050466, held by Ethans Glen WWTP
- October 31, 2017: WILLOW POINTE SANITATION CO, Glencoe, KY0102954, held by Willow Pointe Sanitation Co
WILLIAMSTOWN REGIONAL WRF among its neighbors
EPA’s permit file holds 13 discharge permits in the Clarks Creek subwatershed (HUC 051002051308), KY0109991 among them. Its county holds 51, 1 of them major permits; KY0109991 is a major permit.
Other permits in the Clarks Creek subwatershed (HUC 051002051308)
- CEDAR CREST HOMEOWNERS ASSOC, Dry Ridge: KY0108120, minor permit, discharging to UT / JACKS LICK, permit term to January 31, 2026
- DERBY RUN SUBDIVISION, Williamstown: KYR10U739, minor permit, discharging to Williams Branch, permit term to December 31, 2029
- DRY RIDGE MHP PROJECT, Dry Ridge: KYR10T271, minor permit, discharging to Jacks Lick, permit term to December 31, 2029
- DRY RIDGE, CITY OF, Williamstown: KYP000041, minor permit, discharging to WILLIAMSTOWN STP, permit term to January 31, 2024
- DUKE ENERGY 5367 GLT PROJECT, Williamstown: KYR10U145, minor permit, discharging to Clarks Creek, permit term to December 31, 2029
- GRANT CO STATE MAINTENANCE GARAGE, Williamstown: KYR004728, minor permit, permit term to July 31, 2028
- GRANT COUNTY SCHOOLS, Dry Ridge: KYR10U216, minor permit, discharging to Jacks Lick, permit term to December 31, 2029
- MASON/CORINTH ELEMENTARY SCHOOL, Williamstown: KY0094765, minor permit, discharging to CLARKS CRK, permit term to May 31, 2023
- SMYRNA READY MIX CONCRETE LLC PLANT 230, Dry Ridge: KYG110197, minor permit, permit term to January 31, 2020
- STANCO RECYCLING, Dry Ridge: KY0113719, minor permit, permit term to December 31, 2028
Identity
| Facility as filed | WILLIAMSTOWN REGIONAL WRF |
|---|---|
| Permittee as filed | Williamstown Regional WRF |
| NPDES ID | KY0109991 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | October 5, 2017 |
| Expiration date | November 30, 2022 |
| Address | Williamstown, KY 41097 |
| Receiving water | CLARKS CRK |
| Subwatershed | Clarks Creek (HUC 051002051308) |
Effluent limits and exceedances
- 121Pollutants on file
- 121Under a numeric limit
- 121With a violation of any kind
- 8With 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; the 60 with the most exceedances of 121 are shown.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| E. coli | 2 | 43 | 41 | June 30, 2026 | 3,022% over the limit |
| Nitrogen, ammonia total [as N] | 4 | 43 | 35 | September 30, 2024 | 1,640% over the limit |
| Copper, total recoverable | 8 | 25 | 17 | December 31, 2019 | 3,674% over the limit |
| Di[2-ethylhexyl] phthalate [DEHP] | 4 | 15 | 11 | October 31, 2018 | 863,536% over the limit |
| Solids, suspended percent removal | 1 | 11 | 10 | January 31, 2025 | 267% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 6 | 17 | 7 | May 31, 2022 | 133% over the limit |
| Solids, total suspended | 6 | 10 | 2 | February 28, 2015 | 58% over the limit |
| Oxygen, dissolved [DO] | 1 | 2 | 1 | July 31, 2022 | 3% over the limit |
| Phosphorus, total [as P] | 10 | 10 | 0 | ||
| Zinc, total recoverable | 8 | 8 | 0 | ||
| Oil & Grease | 6 | 8 | 0 | ||
| Cyanide, free [amenable to chlorination] | 6 | 8 | 0 | ||
| Arsenic, total recoverable | 6 | 8 | 0 | ||
| Selenium, total recoverable | 6 | 8 | 0 | ||
| Nickel, total recoverable | 6 | 8 | 0 | ||
| Silver total recoverable | 6 | 8 | 0 | ||
| Cadmium, total recoverable | 6 | 8 | 0 | ||
| Lead, total recoverable | 6 | 8 | 0 | ||
| Chromium, total recoverable | 6 | 8 | 0 | ||
| Mercury, total recoverable | 6 | 8 | 0 | ||
| Hardness, total [as CaCO3] | 4 | 6 | 0 | ||
| Chloride [as Cl] | 4 | 4 | 0 | ||
| Iron, total recoverable | 4 | 4 | 0 | ||
| Phenolics, total | 4 | 4 | 0 | ||
| Flow, in conduit or thru treatment plant | 4 | 4 | 0 | ||
| Chromium, hexavalent tot recoverable | 4 | 4 | 0 | ||
| Temperature, water deg. fahrenheit | 2 | 4 | 0 | ||
| Thallium, total recoverable | 2 | 4 | 0 | ||
| Beryllium, total recoverable [as Be] | 2 | 4 | 0 | ||
| Antimony, total recoverable | 2 | 4 | 0 | ||
| Dichlorobromomethane | 2 | 4 | 0 | ||
| Carbon tetrachloride | 2 | 4 | 0 | ||
| 1,2-Dichloroethane | 2 | 4 | 0 | ||
| Bromoform | 2 | 4 | 0 | ||
| Chloroform | 2 | 4 | 0 | ||
| Toluene | 2 | 4 | 0 | ||
| Benzene | 2 | 4 | 0 | ||
| Acenaphthylene | 2 | 4 | 0 | ||
| Acenaphthene | 2 | 4 | 0 | ||
| Acrolein | 2 | 4 | 0 | ||
| Acrylonitrile | 2 | 4 | 0 | ||
| Anthracene | 2 | 4 | 0 | ||
| Benzo[k]fluoranthene | 2 | 4 | 0 | ||
| Benzo[a]pyrene | 2 | 4 | 0 | ||
| Bis[2-chloroethyl] ether | 2 | 4 | 0 | ||
| Bis[2-chloroethoxy]methane | 2 | 4 | 0 | ||
| Bis[2-chloroisopropyl] ether | 2 | 4 | 0 | ||
| Butyl benzyl phthalate | 2 | 4 | 0 | ||
| Chlorobenzene | 2 | 4 | 0 | ||
| Chlorodibromomethane | 2 | 4 | 0 | ||
| Chrysene | 2 | 4 | 0 | ||
| Diethyl phthalate | 2 | 4 | 0 | ||
| Dimethyl phthalate | 2 | 4 | 0 | ||
| 1,2-Diphenylhydrazine | 2 | 4 | 0 | ||
| Ethylbenzene | 2 | 4 | 0 | ||
| Fluoranthene | 2 | 4 | 0 | ||
| Fluorene | 2 | 4 | 0 | ||
| Hexachlorocyclopentadiene | 2 | 4 | 0 | ||
| Hexachloroethane | 2 | 4 | 0 | ||
| Indeno[1,2,3-cd]pyrene | 2 | 4 | 0 |
Inspections, violations and enforcement
- 5Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| August 19, 2025 | Effluent Violations - Narrative Effluent Violation | ST6 |
| August 1, 2023 | Effluent Violations - Failed Toxicity Test | ST6 |
| June 3, 2019 | Reporting Violations - Failure to Notify | ST6 |
| June 3, 2019 | Management Practice Violations - Improper Operation and Maintenance | ST6 |
| June 3, 2019 | Effluent Violations - Narrative Effluent Violation | ST6 |
Inspections
| Date | What EPA recorded | Agency |
|---|---|---|
| October 27, 2026 | Evaluation | S |
| August 25, 2026 | Evaluation | S |
| March 12, 2026 | Audit | S |
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
EPA’s informal enforcement file holds no action for NPDES KY0109991.
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.