Clean Water Act discharge permit · NPDES IL0023329
ALGONQUIN WWTP, VILLAGE OF, Algonquin, IL: NPDES IL0023329 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 12Pollutants under a numeric limit
- 8Pollutants with an effluent exceedance
ALGONQUIN WWTP, VILLAGE OF, held by ALGONQUIN, VILLAGE OF, holds NPDES permit IL0023329, which discharges to Fox River. EPA’s file records it issued March 29, 2012 and expiring March 31, 2017. 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 | ALGONQUIN WWTP, VILLAGE OF |
|---|---|
| Permittee as filed | ALGONQUIN, VILLAGE OF |
| NPDES ID | IL0023329 |
| 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 | March 29, 2012 |
| Expiration date | March 31, 2017 |
| Address | Algonquin, IL 60102 |
| Receiving water | FOX RIVER |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Jelkes Creek-Fox River (HUC 071200061206) |
| Program components on file | Biosolids, POTW, Pretreatment |
| 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
- 12Under a numeric limit
- 35With 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 |
|---|---|---|---|---|---|
| Copper, total [as Cu] | 0 | 36 | 20 | November 30, 2010 | 1,186% over the limit |
| Nitrogen, ammonia total [as N] | 14 | 55 | 19 | May 31, 2019 | 124% over the limit |
| Solids, total suspended | 7 | 47 | 19 | March 31, 2004 | 1,084% over the limit |
| Phosphorus, total [as P] | 2 | 16 | 12 | February 28, 2025 | 92% over the limit |
| Coliform, fecal general | 2 | 16 | 10 | September 30, 2008 | 1,019% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 6 | 33 | 5 | March 31, 2004 | 300% over the limit |
| Oxygen, dissolved [DO] | 5 | 5 | 3 | July 31, 2021 | 28% over the limit |
| Coliform, fecal - % samples exceeding limit | 1 | 4 | 2 | May 31, 2019 | 60% over the limit |
| Flow, in conduit or thru treatment plant | 4 | 28 | 0 | ||
| pH | 2 | 16 | 0 | ||
| BOD, 5-day, 20 deg. C | 1 | 7 | 0 | ||
| Chlorine, total residual | 1 | 5 | 0 | ||
| Lead, total [as Pb] | 0 | 4 | 0 | ||
| Silver, total [as Ag] | 0 | 4 | 0 | ||
| Cadmium, total [as Cd] | 0 | 3 | 0 | ||
| Chromium, hexavalent [as Cr] | 0 | 3 | 0 | ||
| Iron, total [as Fe] | 0 | 3 | 0 | ||
| Iron, dissolved [as Fe] | 0 | 3 | 0 | ||
| Manganese, total [as Mn] | 0 | 3 | 0 | ||
| Nickel, total [as Ni] | 0 | 3 | 0 | ||
| Zinc, total [as Zn] | 0 | 3 | 0 | ||
| Selenium, total [as Se] | 0 | 3 | 0 | ||
| Phenolics, total recoverable | 0 | 3 | 0 | ||
| Mercury, total [as Hg] | 0 | 3 | 0 | ||
| Nitrogen, total [as N] | 2 | 2 | 0 | ||
| Oil & Grease | 0 | 2 | 0 | ||
| Cyanide, total [as CN] | 0 | 2 | 0 | ||
| Fluoride, total [as F] | 0 | 2 | 0 | ||
| Arsenic, total [as As] | 0 | 2 | 0 | ||
| Barium, total [as Ba] | 0 | 2 | 0 | ||
| Chromium, total [as Cr] | 0 | 2 | 0 | ||
| Alkalinity, total [as CaCO3] | 0 | 1 | 0 | ||
| Phosphorus, dissolved | 0 | 1 | 0 | ||
| Cyanide, weak acid, dissociable | 0 | 1 | 0 | ||
| Cyanide, free [amenable to chlorination] | 0 | 1 | 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
- 6Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| August 28, 2026 | Dry-weather SSO discharge to waters of the U.S. that may endanger health or the environment | ST6 |
| August 23, 2026 | Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment | ST6 |
| June 3, 2026 | Dry-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | ST6 |
| February 13, 2026 | Dry-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | ST6 |
| February 13, 2026 | Dry-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | ST6 |
| October 29, 2025 | Dry-weather SSO, no 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.