Clean Water Act discharge permit · NPDES MO0021768
SALEM WWTP, Salem, MO: NPDES MO0021768 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MajorDischarger class
- 28Pollutants under a numeric limit
- 16Pollutants with an effluent exceedance
SALEM WWTP, held by City of Salem, holds NPDES permit MO0021768, which discharges to Spring Cr.. EPA’s file records it issued March 26, 2024 and expiring March 31, 2029. 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 | SALEM WWTP |
|---|---|
| Permittee as filed | City of Salem |
| NPDES ID | MO0021768 |
| Permit status | Effective |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | March 26, 2024 |
| Expiration date | March 31, 2029 |
| Address | Salem, MO 65560 |
| Receiving water | Spring Cr. |
| Subwatershed | Spring Creek (HUC 071401020103) |
| 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
- 33Pollutants on file
- 28Under a numeric limit
- 20With a violation of any kind
- 16With 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 |
|---|---|---|---|---|---|
| Cadmium, total recoverable | 2 | 24 | 24 | July 31, 2024 | 1,583% over the limit |
| Copper, total recoverable | 2 | 17 | 17 | October 31, 2020 | 61% over the limit |
| Lead, total recoverable | 2 | 15 | 15 | June 30, 2025 | 176% over the limit |
| Zinc, total recoverable | 2 | 26 | 6 | July 31, 2012 | 130% over the limit |
| Silver total recoverable | 2 | 6 | 6 | November 30, 2020 | 143% over the limit |
| Chromium, hexavalent tot recoverable | 0 | 6 | 6 | April 30, 2010 | 426% over the limit |
| Solids, total suspended | 3 | 71 | 5 | September 30, 2019 | 1,358% over the limit |
| Nitrogen, ammonia total [as N] | 6 | 3 | 3 | June 30, 2026 | 483% over the limit |
| BOD, 5-day, 20 deg. C | 3 | 68 | 2 | March 31, 2010 | 541% over the limit |
| Cyanide, free [amenable to chlorination] | 2 | 2 | 2 | November 30, 2020 | 100% over the limit |
| Chromium, hexavalent dissolved [as Cr] | 2 | 2 | 2 | February 29, 2020 | 7% over the limit |
| Chromium, trivalent total recoverable | 2 | 2 | 2 | April 30, 2008 | 79% over the limit |
| E. coli | 2 | 2 | 2 | June 30, 2026 | 135% over the limit |
| Ammonia [as N] + unionized ammonia | 0 | 2 | 2 | June 30, 2007 | 132% over the limit |
| Chromium, total recoverable | 0 | 20 | 1 | August 31, 2005 | 495% over the limit |
| Solids, suspended percent removal | 1 | 1 | 1 | April 30, 2024 | 11% over the limit |
| E. coli, colony forming units [CFU] | 0 | 36 | 0 | ||
| Rainfall | 0 | 15 | 0 | ||
| Toxicity [acute], Ceriodaphnia dubia | 2 | 1 | 0 | ||
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | 2 | 1 | 0 | ||
| Phosphorus, total [as P] | 6 | 0 | 0 | ||
| Nitrogen, total [as N] | 4 | 0 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 4 | 0 | 0 | ||
| Nitrite + Nitrate total [as N] | 4 | 0 | 0 | ||
| Oxygen, dissolved [DO] | 2 | 0 | 0 | ||
| pH | 2 | 0 | 0 | ||
| Oil and grease [soxhlet extr.] tot. | 2 | 0 | 0 | ||
| Hardness, total [as CaCO3] | 2 | 0 | 0 | ||
| Nickel, total recoverable | 2 | 0 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 0 | 0 | ||
| Toxicity [chronic], Ceriodaphnia dubia | 1 | 0 | 0 | ||
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | 1 | 0 | 0 | ||
| BOD, 5-day, percent removal | 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
- 2Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| March 31, 2021 | Effluent Violations - Numeric effluent violation | ST6 |
| April 10, 2020 | Effluent Violations - Narrative 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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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.