Clean Water Act discharge permit · NPDES MO0026646
UNIONVILLE SOUTH WWTF, Unionville, MO: NPDES MO0026646 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 14Pollutants under a numeric limit
- 6Pollutants with an effluent exceedance
UNIONVILLE SOUTH WWTF, held by City of Unionville, holds NPDES permit MO0026646, which discharges to Tributarty To South Blackbird Creek. EPA’s file records it issued July 14, 2017 and expiring March 31, 2021. 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 | UNIONVILLE SOUTH WWTF |
|---|---|
| Permittee as filed | City of Unionville |
| NPDES ID | MO0026646 |
| 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 | July 14, 2017 |
| Expiration date | March 31, 2021 |
| Address | Unionville, MO 63565 |
| Receiving water | Tributarty to South Blackbird Creek |
| Subwatershed | South Blackbird Creek (HUC 102802010503) |
| 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
- 16Pollutants on file
- 14Under a numeric limit
- 16With a violation of any kind
- 6With 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] | 4 | 18 | 10 | March 31, 2026 | 504% over the limit |
| E. coli | 4 | 4 | 4 | June 30, 2026 | 1,074% over the limit |
| BOD, 5-day, 20 deg. C | 4 | 9 | 3 | August 31, 2020 | 99,999% over the limit |
| pH | 2 | 5 | 3 | September 30, 2019 | |
| Solids, total suspended | 4 | 9 | 2 | March 31, 2019 | 39% over the limit |
| Solids, suspended percent removal | 2 | 4 | 1 | September 30, 2019 | 9% over the limit |
| Phosphorus, total [as P] | 4 | 30 | 0 | ||
| Oil and grease [soxhlet extr.] tot. | 4 | 26 | 0 | ||
| Nitrogen, total [as N] | 4 | 26 | 0 | ||
| Flow, in conduit or thru treatment plant | 4 | 4 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 0 | 4 | 0 | ||
| Nitrite + Nitrate total [as N] | 0 | 4 | 0 | ||
| Coliform, fecal general | 1 | 3 | 0 | ||
| Toxicity [acute], Ceriodaphnia dubia | 2 | 2 | 0 | ||
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | 2 | 2 | 0 | ||
| BOD, 5-day, percent removal | 2 | 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
- 10Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| March 31, 2026 | Effluent Violations - Numeric effluent violation | ST6 |
| June 27, 2025 | Effluent Violations - Numeric effluent violation | ST6 |
| March 28, 2025 | Reporting Violations - Failure to submit required report (non-DMR non-pretreatment) | ST6 |
| March 28, 2025 | Effluent Violations - Numeric effluent violation | ST6 |
| March 28, 2025 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| December 31, 2024 | Permit Violations - Violation Specified in Comment | ST6 |
| December 31, 2024 | Effluent Violations - Numeric effluent violation | ST6 |
| November 9, 2023 | Permit Violations - Violation Specified in Comment | ST6 |
| November 9, 2023 | Permit Violations - Failure to Submit Timely Permit Renewal Application | ST6 |
| February 8, 2018 | 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
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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 MO0026646 there.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.