Clean Water Act discharge permit · NPDES IL0077551
WATERLOO STP, CITY OF, Waterloo, IL: NPDES IL0077551 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 31Pollutants under a numeric limit
- 6Pollutants with an effluent exceedance
WATERLOO STP, CITY OF, held by CITY OF WATERLOO, holds NPDES permit IL0077551, which discharges to Unnamed Trib Of Gerhardt Creek. EPA’s file records it issued July 29, 2020 and expiring July 31, 2025. 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 | WATERLOO STP, CITY OF |
|---|---|
| Permittee as filed | CITY OF WATERLOO |
| NPDES ID | IL0077551 |
| 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 | July 29, 2020 |
| Expiration date | July 31, 2025 |
| Address | Waterloo, IL 62298 |
| Receiving water | UNNAMED TRIB OF GERHARDT CREEK |
| Subwatershed | Walters Creek (HUC 071402040607) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 32Pollutants on file
- 31Under a numeric limit
- 11With 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 |
|---|---|---|---|---|---|
| Phosphorus, total [as P] | 4 | 18 | 16 | April 30, 2015 | 98% over the limit |
| Nitrogen, ammonia total [as N] | 32 | 26 | 14 | April 30, 2015 | 417% over the limit |
| Oxygen, dissolved [DO] | 10 | 16 | 10 | March 31, 2025 | 18% over the limit |
| Solids, total suspended | 9 | 14 | 6 | April 30, 2015 | 375% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 8 | 82 | 2 | April 30, 2015 | 61% over the limit |
| Zinc, total [as Zn] | 6 | 2 | 2 | December 31, 2020 | 5% over the limit |
| Nitrogen, total [as N] | 2 | 7 | 0 | ||
| pH | 4 | 4 | 0 | ||
| Flow, in conduit or thru treatment plant | 6 | 2 | 0 | ||
| Chlorine, total residual | 2 | 1 | 0 | ||
| Pollutant table from 503.13 | 0 | 1 | 0 | ||
| Mercury, total [as Hg] | 6 | 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 | ||
| Copper, total [as Cu] | 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 | ||
| Silver, total [as Ag] | 2 | 0 | 0 | ||
| Selenium, total [as Se] | 2 | 0 | 0 | ||
| Phenolics, total recoverable | 2 | 0 | 0 | ||
| Coliform, fecal general | 2 | 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
- 1Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| July 31, 2026 | 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 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, IL0077551.
Start the watch
- One permit holder — $99/month
- One watershed — $2,990/year
- One state — $4,990/year
- The whole register — $18,000/year
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 IL0077551 there.
Nearby on the register
- Discharge permits in Waterloo
- Every permit record in Waterloo, A to Z
- Discharge permits in Illinois
- Every permit record in Illinois, A to Z
Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.