Clean Water Act discharge permit · NPDES IL0023337
ROYALTON STP, VILLAGE OF, Royalton, IL: NPDES IL0023337 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 9Pollutants under a numeric limit
- 5Pollutants with an effluent exceedance
ROYALTON STP, VILLAGE OF, held by ROYALTON, VILLAGE OF, holds NPDES permit IL0023337, which discharges to Big Muddy River. EPA’s file records it issued March 8, 2018 and expiring March 31, 2023. 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 | ROYALTON STP, VILLAGE OF |
|---|---|
| Permittee as filed | ROYALTON, VILLAGE OF |
| NPDES ID | IL0023337 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | March 8, 2018 |
| Expiration date | March 31, 2023 |
| Address | Royalton, IL 62983 |
| Receiving water | BIG MUDDY RIVER |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Town of Cambria-Big Muddy River (HUC 071401060706) |
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
- 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 |
|---|---|---|---|---|---|
| Oxygen, dissolved [DO] | 5 | 161 | 104 | August 31, 2025 | 82% over the limit |
| Solids, total suspended | 5 | 231 | 93 | July 31, 2021 | 132% over the limit |
| Coliform, fecal general | 1 | 71 | 59 | July 31, 2026 | 99,999% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 4 | 98 | 9 | May 31, 2026 | 50% over the limit |
| Chlorine, total residual | 2 | 30 | 3 | July 31, 2002 | 100% over the limit |
| Flow, in conduit or thru treatment plant | 4 | 148 | 0 | ||
| BOD, 5-day, 20 deg. C | 1 | 50 | 0 | ||
| pH | 2 | 44 | 0 | ||
| Nitrogen, ammonia total [as N] | 1 | 10 | 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
- 4Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| March 8, 2026 | Wet-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangerment | ST6 |
| June 7, 2025 | Wet-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangerment | ST6 |
| May 26, 2025 | Dry-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | ST6 |
| May 23, 2025 | Dry-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangerment | 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
One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, IL0023337.
Start the watch
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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 IL0023337 there.
Nearby on the register
Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.