Clean Water Act discharge permit · NPDES ILG551001
OAK GROVE MHP STP, Alton, IL: NPDES ILG551001 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 9Pollutants under a numeric limit
- 4Pollutants with an effluent exceedance
OAK GROVE MHP STP, held by ENCHANTED VILLAGE- OAK GROVE MHP- GODFREY TWP, holds NPDES permit ILG551001, which discharges to Unnamed Trib Of Rocky Creek. EPA’s file records it issued December 11, 2014 and expiring June 30, 2018. 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 | OAK GROVE MHP STP |
|---|---|
| Permittee as filed | ENCHANTED VILLAGE- OAK GROVE MHP- GODFREY TWP |
| NPDES ID | ILG551001 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Coverage under a general permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | December 11, 2014 |
| Expiration date | June 30, 2018 |
| Address | Alton, IL 62035 |
| Receiving water | UNNAMED TRIB OF ROCKY CREEK |
| Subwatershed | Lower Piasa Creek (HUC 071100090204) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 9Pollutants on file
- 9Under a numeric limit
- 9With a violation of any kind
- 4With 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 | 5 | 309 | 105 | September 30, 2016 | 1,192% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 4 | 211 | 46 | May 31, 2016 | 196% over the limit |
| pH | 2 | 96 | 17 | April 30, 2016 | |
| Oxygen, dissolved [DO] | 1 | 13 | 3 | September 30, 2016 | 83% over the limit |
| Flow, in conduit or thru treatment plant | 4 | 182 | 0 | ||
| BOD, 5-day, 20 deg. C | 1 | 55 | 0 | ||
| Chlorine, total residual | 1 | 33 | 0 | ||
| Nitrogen, ammonia total [as N] | 1 | 10 | 0 | ||
| Coliform, fecal general | 1 | 7 | 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
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES ILG551001.
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 ILG551001 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.