Clean Water Act discharge permit · NPDES MO0095109
NIANGUA WWTP, Niangua, MO: NPDES MO0095109 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 11Pollutants under a numeric limit
- 6Pollutants with an effluent exceedance
NIANGUA WWTP, held by City of Niangua, holds NPDES permit MO0095109, which discharges to 8-20-13 Mudd V1.0. EPA’s file records it issued August 23, 2016 and expiring December 31, 2019. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | NIANGUA WWTP |
|---|---|
| Permittee as filed | City of Niangua |
| NPDES ID | MO0095109 |
| 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 | August 23, 2016 |
| Expiration date | December 31, 2019 |
| Issuing agency | MODNR-Water Protection Program |
| Address | Niangua, MO 65713 |
| Receiving water | 8-20-13 MUDD V1.0 |
| Subwatershed | Bowen Creek-Osage Fork Gasconade River (HUC 102902010203) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 11Pollutants on file
- 11Under a numeric limit
- 10With 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] | 6 | 63 | 57 | July 31, 2026 | 2,592% over the limit |
| BOD, 5-day, percent removal | 1 | 26 | 23 | July 31, 2026 | 567% over the limit |
| Solids, suspended percent removal | 1 | 25 | 21 | May 31, 2026 | 567% over the limit |
| BOD, 5-day, 20 deg. C | 3 | 21 | 10 | May 31, 2026 | 120% over the limit |
| pH | 2 | 16 | 10 | August 31, 2023 | |
| Solids, total suspended | 3 | 19 | 7 | July 31, 2022 | 283% over the limit |
| Oil and grease [soxhlet extr.] tot. | 2 | 6 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 6 | 0 | ||
| Toxicity [acute], Ceriodaphnia dubia | 1 | 1 | 0 | ||
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | 1 | 1 | 0 | ||
| E. coli | 2 | 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
- 6Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| September 23, 2025 | Effluent Violations - Numeric effluent violation | ST6 |
| December 26, 2024 | Effluent Violations - Numeric effluent violation | ST6 |
| September 25, 2024 | Effluent Violations - Numeric effluent violation | ST6 |
| December 20, 2023 | Effluent Violations - Numeric effluent violation | ST6 |
| March 24, 2023 | Effluent Violations - Numeric effluent violation | ST6 |
| December 28, 2022 | 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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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 MO0095109 there.
Nearby on the register
Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.