Clean Water Act discharge permit · NPDES IL0027464
ALTON STP, CITY OF, Alton, IL: NPDES IL0027464 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 12Pollutants under a numeric limit
- 5Pollutants with an effluent exceedance
ALTON STP, CITY OF, held by ALTON, CITY OF, holds NPDES permit IL0027464, which discharges to Mississippi River. EPA’s file records it issued November 2, 2011 and expiring November 30, 2016. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | ALTON STP, CITY OF |
|---|---|
| Permittee as filed | ALTON, CITY OF |
| NPDES ID | IL0027464 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | November 2, 2011 |
| Expiration date | November 30, 2016 |
| Address | Alton, IL 62002 |
| Receiving water | MISSISSIPPI RIVER |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | East Branch Wood River-Wood River (HUC 071100090304) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 36Pollutants on file
- 12Under a numeric limit
- 34With a violation of any kind
- 5With 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 |
|---|---|---|---|---|---|
| Coliform, fecal general | 2 | 13 | 13 | July 31, 2026 | 99,999% over the limit |
| Chlorine, total residual | 4 | 14 | 8 | June 30, 2026 | 119% over the limit |
| Solids, total suspended | 9 | 13 | 3 | August 31, 2025 | 9% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 8 | 21 | 1 | November 30, 2022 | 5% over the limit |
| pH | 4 | 7 | 1 | November 30, 2022 | |
| Rainfall | 0 | 18 | 0 | ||
| Nitrogen, total [as N] | 4 | 12 | 0 | ||
| Phosphorus, total [as P] | 4 | 10 | 0 | ||
| Cyanide, total [as CN] | 0 | 8 | 0 | ||
| Cyanide, free [amenable to chlorination] | 0 | 8 | 0 | ||
| Arsenic, total [as As] | 0 | 8 | 0 | ||
| Cadmium, total [as Cd] | 0 | 8 | 0 | ||
| Chromium, total [as Cr] | 0 | 8 | 0 | ||
| Oil & Grease | 0 | 7 | 0 | ||
| Chromium, hexavalent [as Cr] | 0 | 7 | 0 | ||
| Iron, dissolved [as Fe] | 0 | 7 | 0 | ||
| Lead, total [as Pb] | 0 | 7 | 0 | ||
| Nickel, total [as Ni] | 0 | 7 | 0 | ||
| Silver, total [as Ag] | 0 | 7 | 0 | ||
| Selenium, total [as Se] | 0 | 7 | 0 | ||
| Phenolics, total recoverable | 0 | 7 | 0 | ||
| Mercury, total [as Hg] | 0 | 7 | 0 | ||
| Nitrogen, ammonia total [as N] | 12 | 6 | 0 | ||
| Flow, in conduit or thru treatment plant | 6 | 6 | 0 | ||
| Copper, total [as Cu] | 0 | 6 | 0 | ||
| Flow | 0 | 6 | 0 | ||
| Fluoride, total [as F] | 0 | 5 | 0 | ||
| Barium, total [as Ba] | 0 | 4 | 0 | ||
| Iron, total [as Fe] | 0 | 4 | 0 | ||
| Manganese, total [as Mn] | 0 | 4 | 0 | ||
| Zinc, total [as Zn] | 0 | 4 | 0 | ||
| Effluent dilution ratio | 1 | 3 | 0 | ||
| Cyanide, weak acid, dissociable | 0 | 1 | 0 | ||
| Duration | 0 | 1 | 0 | ||
| Overflows | 4 | 0 | 0 | ||
| BOD, 5-day, 20 deg. C | 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
- 28Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| September 4, 2026 | Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment | EP6 |
| June 21, 2026 | Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environment | ST6 |
| July 21, 2025 | Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environment | ST6 |
| June 9, 2025 | Dry-weather SSO discharge to waters of the U.S. that may endanger health or the environment | ST6 |
| June 5, 2025 | Dry-weather SSO discharge to waters of the U.S. that may endanger health or the environment | ST6 |
| April 4, 2025 | Wet-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | ST6 |
| April 4, 2025 | Wet-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | ST6 |
| April 4, 2025 | Wet-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | ST6 |
| April 4, 2025 | Wet-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | ST6 |
| April 4, 2025 | Wet-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | ST6 |
| April 4, 2025 | Wet-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | ST6 |
| April 4, 2025 | Wet-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | ST6 |
| April 4, 2025 | Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environment | ST6 |
| April 4, 2025 | Wet-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangerment | ST6 |
| February 15, 2025 | Dry-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | ST6 |
| February 14, 2025 | Dry-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | ST6 |
| November 5, 2024 | Wet-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | ST6 |
| November 4, 2024 | Wet-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | ST6 |
| November 4, 2024 | Wet-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | ST6 |
| November 4, 2024 | Wet-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | ST6 |
| November 4, 2024 | Wet-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | ST6 |
| November 4, 2024 | Wet-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | ST6 |
| November 4, 2024 | Wet-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | ST6 |
| November 4, 2024 | Wet-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | ST6 |
| November 4, 2024 | Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environment | ST6 |
| November 4, 2024 | Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environment | ST6 |
| November 4, 2024 | Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environment | ST6 |
| November 4, 2024 | Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environment | ST6 |
Velarion’s copy of EPA’s ICIS-NPDES files does not yet 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 September 14, 2026.