Clean Water Act discharge permit · NPDES MO0027111
HERCULANEUM WWTP, Herculaneum, MO: NPDES MO0027111 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 23Pollutants under a numeric limit
- 7Pollutants with an effluent exceedance
HERCULANEUM WWTP, held by City of Herculaneum, holds NPDES permit MO0027111, which discharges to Joachim Creek. EPA’s file records it issued February 21, 2017 and expiring February 28, 2022. The status and dates are as EPA’s permit file stood when Velarion loaded it (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | HERCULANEUM WWTP |
|---|---|
| Permittee as filed | City of Herculaneum |
| NPDES ID | MO0027111 |
| 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 | February 21, 2017 |
| Expiration date | February 28, 2022 |
| Address | Herculaneum, MO 63048 |
| Receiving water | Joachim Creek |
| Subwatershed | Lower Joachim Creek (HUC 071401010804) |
| Program components on file | Biosolids, POTW |
| SIC | 4952 – Sewerage Systems |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download.
Effluent limits and exceedances
- 26Pollutants on file
- 23Under a numeric limit
- 24With a violation of any kind
- 7With 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 |
|---|---|---|---|---|---|
| Solids, total suspended | 3 | 19 | 13 | August 31, 2025 | 340% over the limit |
| Zinc, total recoverable | 2 | 13 | 9 | December 31, 2019 | 100% over the limit |
| Nitrogen, ammonia total [as N] | 4 | 13 | 5 | December 31, 2025 | 1,048% over the limit |
| Solids, suspended percent removal | 0 | 4 | 4 | March 31, 2025 | 360% over the limit |
| Oil and grease [soxhlet extr.] tot. | 2 | 6 | 2 | March 31, 2024 | 140% over the limit |
| Lead, total recoverable | 2 | 6 | 2 | June 30, 2020 | 9% over the limit |
| pH | 2 | 9 | 1 | July 31, 2017 | |
| Phosphorus, total [as P] | 4 | 8 | 0 | ||
| BOD, 5-day, 20 deg. C | 3 | 6 | 0 | ||
| Nitrogen, total [as N] | 4 | 4 | 0 | ||
| Hardness, total [as CaCO3] | 2 | 4 | 0 | ||
| Nickel, total recoverable | 2 | 4 | 0 | ||
| Cadmium, total recoverable | 2 | 4 | 0 | ||
| Copper, total recoverable | 2 | 4 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 4 | 0 | ||
| E. coli | 2 | 4 | 0 | ||
| Toxicity [acute], Ceriodaphnia dubia | 2 | 4 | 0 | ||
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | 2 | 4 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 0 | 4 | 0 | ||
| Nitrite + Nitrate total [as N] | 0 | 4 | 0 | ||
| Arsenic, total recoverable | 2 | 2 | 0 | ||
| Chromium, hexavalent dissolved [as Cr] | 2 | 2 | 0 | ||
| Chromium, trivalent total recoverable | 2 | 2 | 0 | ||
| Mercury, total recoverable | 2 | 2 | 0 | ||
| Toxicity [chronic], Ceriodaphnia dubia | 1 | 0 | 0 | ||
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | 1 | 0 | 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
- 5Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| April 23, 2026 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| April 3, 2024 | Effluent Violations - Numeric effluent violation | ST6 |
| November 20, 2023 | Reporting Violations - Failure to Submit DMRs | ST6 |
| September 19, 2022 | Permit Violations - Violation Specified in Comment | ST6 |
| June 29, 2017 | Permit Violations - Violation Specified in Comment | ST6 |
Velarion’s copy of EPA’s ICIS-NPDES files does not 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.
Watch this permit
One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, MO0027111.
Start the watch
- One permit holder — $99/month
- One watershed — $2,990/year
- One state — $4,990/year
- The whole register — $18,000/year
How we handle your data → Privacy
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 MO0027111 there.
Nearby on the register
- Discharge permits in Herculaneum
- Every permit record in Herculaneum, A to Z
- Discharge permits in Missouri
- Every permit record in Missouri, A to Z
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.