Clean Water Act discharge permit · NPDES IL0029203
HILLSBORO STP, CITY OF, Hillsboro, IL: NPDES IL0029203 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 32Pollutants under a numeric limit
- 8Pollutants with an effluent exceedance
HILLSBORO STP, CITY OF, held by HILLSBORO, CITY OF, holds NPDES permit IL0029203, which discharges to Middle Fork Of Shoal Creek. EPA’s file records it issued October 31, 2019 and expiring October 31, 2024. 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 | HILLSBORO STP, CITY OF |
|---|---|
| Permittee as filed | HILLSBORO, CITY OF |
| NPDES ID | IL0029203 |
| 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 | October 31, 2019 |
| Expiration date | October 31, 2024 |
| Address | Hillsboro, IL 62049 |
| Receiving water | MIDDLE FORK OF SHOAL CREEK |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Cress Creek-Middle Fork Shoal Creek (HUC 071402030204) |
| 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
- 35Pollutants on file
- 32Under a numeric limit
- 13With a violation of any kind
- 8With 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 |
|---|---|---|---|---|---|
| Nitrogen, ammonia total [as N] | 16 | 35 | 35 | April 30, 2026 | 111% over the limit |
| Solids, total suspended | 7 | 13 | 13 | June 30, 2026 | 56% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 4 | 11 | 11 | April 30, 2026 | 80% over the limit |
| Coliform, fecal general | 2 | 11 | 11 | June 30, 2026 | 2,700% over the limit |
| Copper, total [as Cu] | 2 | 7 | 7 | April 30, 2006 | 53% over the limit |
| BOD, 5-day, 20 deg. C | 3 | 2 | 2 | June 30, 2020 | 23% over the limit |
| Chlorine, total residual | 2 | 2 | 2 | April 30, 2023 | 3% over the limit |
| Silver, total [as Ag] | 2 | 1 | 1 | January 31, 2002 | 20% over the limit |
| 1H,1H,2H,2H-Perfluorohexane sulfonic acid (4:2 FTS) | 0 | 2 | 0 | ||
| 1H,1H,2H,2H-Perfluorooctane sulfonic acid (6:2 FTS) | 0 | 2 | 0 | ||
| 1H,1H, 2H, 2H-Perfluorodecane sulfonic acid (8:2 FTS) | 0 | 2 | 0 | ||
| Phosphorus, total [as P] | 4 | 1 | 0 | ||
| Mercury, total [as Hg] | 2 | 1 | 0 | ||
| Oxygen, dissolved [DO] | 8 | 0 | 0 | ||
| pH | 4 | 0 | 0 | ||
| Flow, in conduit or thru treatment plant | 4 | 0 | 0 | ||
| Oil & Grease | 2 | 0 | 0 | ||
| Cyanide, total [as CN] | 2 | 0 | 0 | ||
| Cyanide, free [amenable to chlorination] | 2 | 0 | 0 | ||
| Fluoride, total [as F] | 2 | 0 | 0 | ||
| Arsenic, total [as As] | 2 | 0 | 0 | ||
| Barium, total [as Ba] | 2 | 0 | 0 | ||
| Cadmium, total [as Cd] | 2 | 0 | 0 | ||
| Chromium, hexavalent [as Cr] | 2 | 0 | 0 | ||
| Chromium, total [as Cr] | 2 | 0 | 0 | ||
| Iron, total [as Fe] | 2 | 0 | 0 | ||
| Iron, dissolved [as Fe] | 2 | 0 | 0 | ||
| Lead, total [as Pb] | 2 | 0 | 0 | ||
| Manganese, total [as Mn] | 2 | 0 | 0 | ||
| Nickel, total [as Ni] | 2 | 0 | 0 | ||
| Zinc, total [as Zn] | 2 | 0 | 0 | ||
| Selenium, total [as Se] | 2 | 0 | 0 | ||
| Phenolics, total recoverable | 2 | 0 | 0 | ||
| Nitrogen, total [as N] | 1 | 0 | 0 | ||
| Flow, total | 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 |
|---|---|---|
| January 8, 2026 | Wet-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | ST6 |
| January 5, 2026 | Dry-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 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.