Clean Water Act discharge permit · NPDES MO0108880
MAWC, STEWARTSVILLE WWTF, Stewartsville, MO: NPDES MO0108880 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 10Pollutants under a numeric limit
- 7Pollutants with an effluent exceedance
MAWC, STEWARTSVILLE WWTF, held by MISSOURI-AMERICAN WATER COMPANY, holds NPDES permit MO0108880, which discharges to Castile Cr.. EPA’s file records it issued October 9, 2019 and expiring September 30, 2024. 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 | MAWC, STEWARTSVILLE WWTF |
|---|---|
| Permittee as filed | MISSOURI-AMERICAN WATER COMPANY |
| NPDES ID | MO0108880 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | October 9, 2019 |
| Expiration date | September 30, 2024 |
| Address | Stewartsville, MO 64490 |
| Receiving water | Castile Cr. |
| Subwatershed | Upper Castile Creek (HUC 102400120501) |
| 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
- 15Pollutants on file
- 10Under a numeric limit
- 15With 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 | 2 | 32 | 14 | June 30, 2024 | 1,443% over the limit |
| Nitrogen, ammonia total [as N] | 8 | 30 | 14 | May 31, 2025 | 541% over the limit |
| BOD, 5-day, 20 deg. C | 2 | 26 | 8 | June 30, 2023 | 169% over the limit |
| Solids, suspended percent removal | 0 | 7 | 5 | June 30, 2023 | 175% over the limit |
| pH | 2 | 11 | 3 | June 30, 2023 | |
| E. coli | 2 | 7 | 3 | December 31, 2023 | 298% over the limit |
| BOD, 5-day, percent removal | 0 | 5 | 3 | June 30, 2023 | 253% over the limit |
| Phosphorus, total [as P] | 4 | 16 | 0 | ||
| Oil and grease [soxhlet extr.] tot. | 2 | 12 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 12 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 4 | 8 | 0 | ||
| Nitrite + Nitrate total [as N] | 4 | 8 | 0 | ||
| Nitrogen, total [as N] | 0 | 8 | 0 | ||
| Toxicity [acute], Ceriodaphnia dubia | 0 | 1 | 0 | ||
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | 0 | 1 | 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 |
|---|---|---|
| April 22, 2024 | Effluent Violations - Numeric effluent violation | ST6 |
| December 18, 2023 | Effluent Violations - Numeric effluent violation | ST6 |
| August 1, 2023 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| April 17, 2023 | Effluent Violations - Numeric effluent violation | ST6 |
| December 21, 2022 | Reporting Violations - Failure to Submit DMRs | ST6 |
| August 25, 2021 | Effluent Violations - Narrative Effluent Violation | ST6 |
| August 25, 2021 | Effluent Violations - Numeric effluent violation | ST6 |
| December 27, 2019 | Effluent Violations - Numeric effluent violation | ST6 |
| July 1, 2019 | Reporting Violations - Failure to Submit DMRs | ST6 |
| July 1, 2019 | 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.
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 MO0108880 there.
Nearby on the register
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- Every permit record in Stewartsville, A to Z
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- Every permit record in Missouri, A to Z
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.