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Sewage treatment plant, major discharger, Mokena, Illinois. NPDES permit IL0024201 expired Aug 31, 2024; its limits still apply. Last 12 months: over a limit once (last January 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| January 2026 | Nitrogen, ammonia total [as N], daily maximum | 5.47 mg/L | ≤ 3.2 mg/L | 71% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | monthly maximum | report only (deg F) | all year | 001 |
| Oxygen, dissolved [DO] | monthly average minimum | ≥ 5.5 mg/L | Jan, Feb, Aug, Sep, Oct, Nov, Dec | 001 |
| Oxygen, dissolved [DO] | minimum weekly average | ≥ 6 mg/L | Mar–Jul | 001 |
| Oxygen, dissolved [DO] | minimum weekly average | ≥ 4 mg/L | Jan, Feb, Aug, Sep, Oct, Nov, Dec | 001 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 5 mg/L | Mar–Jul | 001 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 3.5 mg/L | Jan, Feb, Aug, Sep, Oct, Nov, Dec | 001 |
| pH | minimum | ≥ 6 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 12 mg/L | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 24 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 651 lb/d | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 1301 lb/d | all year | 001 |
| Oil & Grease | daily maximum | report only (mg/L) | all year | 001 |
| Oil & Grease | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.1 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.5 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.2 mg/L | Feb | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .4 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .4 mg/L | Jul | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.1 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .4 mg/L | Aug | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.1 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.2 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.2 mg/L | Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.2 mg/L | Jan | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.1 mg/L | Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.9 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.1 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.2 mg/L | Feb | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1.8 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1.8 mg/L | Jul | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.9 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1.8 mg/L | Aug | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.9 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.2 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.2 mg/L | Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.2 mg/L | Jan | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.9 mg/L | Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 60 lb/d | May | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 81 lb/d | Mar | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 119 lb/d | Feb | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 22 lb/d | Jun | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 22 lb/d | Jul | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 60 lb/d | Sep | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 22 lb/d | Aug | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 60 lb/d | Apr | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 119 lb/d | Nov | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 119 lb/d | Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 119 lb/d | Jan | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 60 lb/d | Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 157 lb/d | May | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 168 lb/d | Mar | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 173 lb/d | Feb | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 98 lb/d | Jun | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 98 lb/d | Jul | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 157 lb/d | Sep | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 98 lb/d | Aug | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 157 lb/d | Apr | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 173 lb/d | Nov | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 173 lb/d | Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 173 lb/d | Jan | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 157 lb/d | Oct | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 1 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 1 mg/L | Aug | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 1 mg/L | Jul | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 54 lb/d | Jun | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 54 lb/d | Aug | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 54 lb/d | Jul | 001 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | monthly average | ≤ 1 mg/L | all year | 001 |
| Phosphorus, total [as P] | monthly average | ≤ 54 lb/d | all year | 001 |
| Phosphorus, dissolved | daily maximum | report only (mg/L) | all year | 001 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | 001 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | 001 |
| Cyanide, free [amenable to chlorination] | daily maximum | report only (ug/L) | all year | 001 |
| Cyanide, free [amenable to chlorination] | daily maximum | report only (ug/L) | all year | 001 |
| Chloride [as Cl] | daily maximum | report only (mg/L) | all year | 001 |
| Fluoride, total [as F] | daily maximum | report only (mg/L) | all year | 001 |
| Fluoride, total [as F] | daily maximum | report only (mg/L) | all year | 001 |
| Arsenic, total [as As] | daily maximum | report only (mg/L) | all year | 001 |
| Arsenic, total [as As] | daily maximum | report only (mg/L) | all year | 001 |
| Barium, total [as Ba] | daily maximum | report only (mg/L) | all year | 001 |
| Barium, total [as Ba] | daily maximum | report only (mg/L) | all year | 001 |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | all year | 001 |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | all year | 001 |
| Chromium, hexavalent [as Cr] | daily maximum | report only (mg/L) | all year | 001 |
| Chromium, hexavalent [as Cr] | daily maximum | report only (mg/L) | all year | 001 |
| Chromium, total [as Cr] | daily maximum | report only (mg/L) | all year | 001 |
| Chromium, total [as Cr] | daily maximum | report only (mg/L) | all year | 001 |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year | 001 |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year | 001 |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | all year | 001 |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | all year | 001 |
| Iron, dissolved [as Fe] | daily maximum | report only (mg/L) | all year | 001 |
| Iron, dissolved [as Fe] | daily maximum | report only (mg/L) | all year | 001 |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | all year | 001 |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | all year | 001 |
| Manganese, total [as Mn] | daily maximum | report only (mg/L) | all year | 001 |
| Manganese, total [as Mn] | daily maximum | report only (mg/L) | all year | 001 |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | all year | 001 |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | all year | 001 |
| Silver, total [as Ag] | daily maximum | report only (mg/L) | all year | 001 |
| Silver, total [as Ag] | daily maximum | report only (mg/L) | all year | 001 |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | all year | 001 |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | all year | 001 |
| Selenium, total [as Se] | daily maximum | report only (mg/L) | all year | 001 |
| Selenium, total [as Se] | daily maximum | report only (mg/L) | all year | 001 |
| Phenolics, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Phenolics, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ .05 mg/L | May–Oct | 001 |
| Chlorine, total residual | daily maximum | ≤ .05 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Specific conductance [umho/cm] | daily maximum | report only (uS/cm) | all year | 001 |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | all year | 001 |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | all year | 001 |
| Coliform, fecal general | daily maximum | ≤ 400 #/100mL | May–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 10 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 20 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 542 lb/d | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 1084 lb/d | all year | 001 |
| Oxygen, dissolved [DO] | monthly average minimum | report only (mg/L) | all year | 002 |
| Oxygen, dissolved [DO] | minimum weekly average | report only (mg/L) | all year | 002 |
| Oxygen, dissolved [DO] | daily minimum | report only (mg/L) | all year | 002 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year | 002 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | all year | 002 |
| pH | minimum | ≥ 6 SU | all year | 002 |
| pH | maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 002 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 002 |
| Chlorine, total residual | monthly average | ≤ .75 mg/L | all year | 002 |
| Coliform, fecal general | daily maximum | ≤ 400 #/100mL | all year | 002 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 002 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | INF |
| Solids, total suspended | monthly average | report only (mg/L) | all year | INF |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | INF |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | INF |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | INF |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | INF |
Cited limits by parameter: Illinois's rules and the federal ones.
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Your permit document is the final word. As JSON: /api/v1/permits/IL0024201 · MCP: https://passage-data.com/mcp