Clean Water Act discharge permit · NPDES MO0033286
MARYVILLE WWTP, Maryville, MO: NPDES MO0033286 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MajorDischarger class
- 19Pollutants under a numeric limit
- 14Pollutants with an effluent exceedance
MARYVILLE WWTP, held by City of Maryville, holds NPDES permit MO0033286, which discharges to One Hundred And Two R.. EPA’s file records it issued January 9, 2018 and expiring September 30, 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 | MARYVILLE WWTP |
|---|---|
| Permittee as filed | City of Maryville |
| NPDES ID | MO0033286 |
| Permit status | Effective |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | January 9, 2018 |
| Expiration date | September 30, 2022 |
| Issuing agency | MODNR-Water Protection Program |
| Address | Maryville, MO 64468 |
| Receiving water | One Hundred and Two R. |
| Subwatershed | Thill Branch-One Hundred and Two River (HUC 102400130304) |
| Program components on file | POTW, Pretreatment |
| 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
- 30Pollutants on file
- 19Under a numeric limit
- 28With a violation of any kind
- 14With 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 | 58 | 54 | January 31, 2026 | 569% over the limit |
| Solids, total suspended | 2 | 21 | 17 | January 31, 2026 | 151% over the limit |
| Copper, total recoverable | 2 | 17 | 11 | June 30, 2016 | 138% over the limit |
| Zinc, total recoverable | 2 | 15 | 11 | December 31, 2021 | 220% over the limit |
| Cyanide, free [amenable to chlorination] | 2 | 20 | 10 | June 30, 2025 | 317% over the limit |
| BOD, 5-day, 20 deg. C | 2 | 14 | 8 | August 31, 2022 | 242% over the limit |
| Cadmium, total recoverable | 2 | 16 | 6 | March 31, 2015 | 1,513% over the limit |
| Lead, total recoverable | 2 | 10 | 4 | June 30, 2016 | 122% over the limit |
| E. coli | 2 | 4 | 4 | June 30, 2025 | 99,999% over the limit |
| Oil and grease [soxhlet extr.] tot. | 2 | 9 | 3 | October 31, 2001 | 337% over the limit |
| BOD, 5-day, percent removal | 1 | 4 | 3 | March 31, 2025 | 317% over the limit |
| Chromium, total recoverable | 0 | 4 | 2 | September 30, 2000 | 6% over the limit |
| Solids, suspended percent removal | 1 | 2 | 2 | January 31, 2022 | 47% over the limit |
| Oxygen, dissolved [DO] | 0 | 122 | 1 | July 31, 2016 | 16% over the limit |
| Temperature, water deg. fahrenheit | 0 | 48 | 0 | ||
| Chlorine, total residual | 0 | 24 | 0 | ||
| Coliform, fecal general | 0 | 24 | 0 | ||
| E. coli, colony forming units [CFU] | 0 | 14 | 0 | ||
| Nitrogen, total [as N] | 4 | 6 | 0 | ||
| Phosphorus, total [as P] | 4 | 4 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 4 | 0 | ||
| Nickel, total recoverable | 0 | 4 | 0 | ||
| Mercury, total recoverable | 0 | 4 | 0 | ||
| pH | 2 | 2 | 0 | ||
| Hardness, total [as CaCO3] | 2 | 2 | 0 | ||
| Temperature, water deg. centigrade | 0 | 2 | 0 | ||
| Toxicity [chronic], Ceriodaphnia dubia | 0 | 1 | 0 | ||
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | 0 | 1 | 0 | ||
| Toxicity [acute], Ceriodaphnia dubia | 2 | 0 | 0 | ||
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | 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 |
|---|---|---|
| February 7, 2023 | Pretreatment - Failure to Develop/Enforce Standards | ST6 |
| December 15, 2022 | Pretreatment - Failure to Develop/Enforce Standards | ST6 |
| March 29, 2021 | Effluent Violations - Numeric effluent violation | ST6 |
| February 27, 2018 | Pretreatment - Failure to Develop/Enforce Standards | ST6 |
| January 25, 2018 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| December 7, 2017 | Reporting Violations - Improper/ Incorrect Reporting | 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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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.