Clean Water Act discharge permit · NPDES IL0040070
MAZON STP, VILLAGE OF, Mazon, IL: NPDES IL0040070 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 9Pollutants under a numeric limit
- 3Pollutants with an effluent exceedance
MAZON STP, VILLAGE OF, held by MAZON, VILLAGE OF, holds NPDES permit IL0040070, which discharges to Johnny Run Creek. EPA’s file records it issued February 10, 2017 and expiring February 28, 2022. 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 | MAZON STP, VILLAGE OF |
|---|---|
| Permittee as filed | MAZON, VILLAGE OF |
| NPDES ID | IL0040070 |
| 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 | February 10, 2017 |
| Expiration date | February 28, 2022 |
| Address | Mazon, IL 60444 |
| Receiving water | JOHNNY RUN CREEK |
| Subwatershed | Thunder Creek-Johnny Run (HUC 071200050402) |
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
- 3With 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 | 56 | 55 | October 31, 2022 | 65% over the limit |
| Solids, total suspended | 5 | 87 | 7 | November 30, 2025 | 78% over the limit |
| pH | 2 | 35 | 1 | October 31, 2024 | |
| Flow, in conduit or thru treatment plant | 4 | 70 | 0 | ||
| BOD, carbonaceous [5 day, 20 C] | 4 | 68 | 0 | ||
| BOD, 5-day, 20 deg. C | 1 | 16 | 0 | ||
| Chlorine, total residual | 1 | 6 | 0 | ||
| Nitrogen, ammonia total [as N] | 1 | 1 | 0 | ||
| Coliform, fecal general | 1 | 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
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES IL0040070.
Velarion’s copy of EPA’s ICIS-NPDES files does not yet 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, IL0040070.
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 IL0040070 there.
Nearby on the register
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- Every permit record in Mazon, A to Z
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- Every permit record in Illinois, A to Z
Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.