Clean Water Act discharge permit · NPDES MO0047341
PIEDMONT WWTF, Piedmont, MO: NPDES MO0047341 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 13Pollutants under a numeric limit
- 13Pollutants with an effluent exceedance
PIEDMONT WWTF, held by City of Piedmont, holds NPDES permit MO0047341, which discharges to Mckenzie Creek. EPA’s file records it issued October 29, 2014 and expiring October 31, 2019. 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 | PIEDMONT WWTF |
|---|---|
| Permittee as filed | City of Piedmont |
| NPDES ID | MO0047341 |
| 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 | October 29, 2014 |
| Expiration date | October 31, 2019 |
| Address | Piedmont, MO 63957 |
| Receiving water | McKenzie Creek |
| Subwatershed | McKenzie Creek (HUC 110100070601) |
| 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
- 22Pollutants on file
- 13Under a numeric limit
- 18With a violation of any kind
- 13With 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 |
|---|---|---|---|---|---|
| BOD, 5-day, 20 deg. C | 5 | 615 | 343 | May 31, 2026 | 99,999% over the limit |
| Solids, total suspended | 5 | 332 | 202 | May 31, 2026 | 7,676% over the limit |
| Oil and grease [soxhlet extr.] tot. | 6 | 279 | 65 | January 31, 2020 | 21,456% over the limit |
| Flow, in conduit or thru treatment plant | 3 | 150 | 64 | December 31, 2022 | 1,183% over the limit |
| E. coli, colony forming units [CFU] | 2 | 52 | 52 | September 30, 2020 | 99,999% over the limit |
| Coliform, fecal general | 0 | 43 | 37 | September 30, 2014 | 99,999% over the limit |
| pH | 4 | 230 | 36 | October 31, 2020 | |
| Ammonia [as N] + unionized ammonia | 0 | 39 | 25 | February 28, 2013 | 343% over the limit |
| Nitrogen, ammonia total [as N] | 4 | 28 | 22 | May 31, 2026 | 364% over the limit |
| BOD, 5-day, percent removal | 0 | 8 | 8 | May 31, 2026 | 463% over the limit |
| Solids, suspended percent removal | 0 | 8 | 8 | January 31, 2026 | 567% over the limit |
| E. coli | 0 | 6 | 6 | May 31, 2026 | 99,999% over the limit |
| Chlorine, total residual | 0 | 8 | 2 | June 30, 2012 | 521,150% over the limit |
| Oxygen, dissolved [DO] | 4 | 88 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 0 | 4 | 0 | ||
| Phosphorus, total [as P] | 2 | 2 | 0 | ||
| Temperature, water deg. centigrade | 0 | 2 | 0 | ||
| Nitrite + Nitrate total [as N] | 0 | 2 | 0 | ||
| Nitrogen, total [as N] | 2 | 0 | 0 | ||
| Chloride [as Cl] | 2 | 0 | 0 | ||
| Toxicity [acute], Ceriodaphnia dubia | 1 | 0 | 0 | ||
| Toxicity [acute], 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
- 11Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| March 4, 2022 | Permit Violations - Violation Specified in Comment | ST6 |
| March 31, 2021 | Effluent Violations - Numeric effluent violation | ST6 |
| October 9, 2020 | Effluent Violations - Numeric effluent violation | ST6 |
| February 20, 2020 | Effluent Violations - Narrative Effluent Violation | ST6 |
| February 20, 2020 | Effluent Violations - Numeric effluent violation | ST6 |
| October 7, 2019 | Effluent Violations - Numeric effluent violation | ST6 |
| July 30, 2019 | Effluent Violations - Numeric effluent violation | ST6 |
| June 27, 2019 | Effluent Violations - Numeric effluent violation | ST6 |
| September 24, 2018 | Effluent Violations - Numeric effluent violation | ST6 |
| March 27, 2018 | Permit Violations - Violation Specified in Comment | ST6 |
| March 27, 2018 | Effluent Violations - Numeric effluent violation | 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.
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Nearby on the register
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- Every permit record in Missouri, A to Z
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.