Clean Water Act discharge permit · NPDES IL0027804
BYRON STP, CITY OF, Byron, IL: NPDES IL0027804 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 8Pollutants under a numeric limit
- 6Pollutants with an effluent exceedance
BYRON STP, CITY OF, held by BYRON, CITY OF, holds NPDES permit IL0027804, which discharges to Rock River. EPA’s file records it issued June 12, 2018 and expiring June 30, 2023. 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 | BYRON STP, CITY OF |
|---|---|
| Permittee as filed | BYRON, CITY OF |
| NPDES ID | IL0027804 |
| 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 | June 12, 2018 |
| Expiration date | June 30, 2023 |
| Address | Byron, IL 61010 |
| Receiving water | ROCK RIVER |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Lake Louise-Rock River (HUC 070900050407) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 8Pollutants on file
- 8Under a numeric limit
- 8With a violation of any kind
- 6With 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 | 1 | 125 | 95 | July 31, 2025 | 162,400% over the limit |
| Nitrogen, ammonia total [as N] | 6 | 47 | 18 | August 31, 2024 | 127% over the limit |
| Solids, total suspended | 5 | 201 | 17 | June 30, 2025 | 378% over the limit |
| Chlorine, total residual | 1 | 48 | 9 | November 30, 2018 | 1,300% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 4 | 150 | 2 | February 28, 2003 | 4% over the limit |
| pH | 2 | 79 | 1 | January 31, 2007 | |
| Flow, in conduit or thru treatment plant | 4 | 156 | 0 | ||
| BOD, 5-day, 20 deg. C | 1 | 39 | 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 IL0027804.
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, IL0027804.
Start the watch
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How we handle your data → Privacy
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 IL0027804 there.
Nearby on the register
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- Every permit record in Illinois, A to Z
Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.