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Sewage treatment plant, major discharger, Carlinville, Illinois. NPDES permit IL0022675, in force until Jun 30, 2027. Last 12 months: over a limit 45 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Outfall | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|---|
| October 2025 | B01 | Mercury, total [as Hg], annual average | 18 ng/L | ≤ 12 ng/L | 50% |
| October 2025 | B01 | Nitrogen, ammonia total [as N], monthly average | 2.29 mg/L | ≤ 1.5 mg/L | 53% |
| November 2025 | 001 | BOD, 5-day, 20 deg. C, monthly average | 41 mg/L | ≤ 30 mg/L | 37% |
| November 2025 | 001 | BOD, 5-day, 20 deg. C, weekly average | 97 mg/L | ≤ 45 mg/L | 116% |
| November 2025 | 001 | Solids, total suspended, weekly average | 64 mg/L | ≤ 45 mg/L | 42% |
| November 2025 | B01 | Mercury, total [as Hg], annual average | 19.48 ng/L | ≤ 12 ng/L | 62% |
| December 2025 | B01 | Mercury, total [as Hg], annual average | 20.698 ng/L | ≤ 12 ng/L | 73% |
| January 2026 | B01 | BOD, carbonaceous [5 day, 20 C], monthly average | 11.75 mg/L | ≤ 10 mg/L | 18% |
| January 2026 | B01 | Mercury, total [as Hg], annual average | 20.4 ng/L | ≤ 12 ng/L | 70% |
| February 2026 | B01 | BOD, carbonaceous [5 day, 20 C], daily maximum | 55 mg/L | ≤ 20 mg/L | 175% |
| February 2026 | B01 | BOD, carbonaceous [5 day, 20 C], monthly average | 26 mg/L | ≤ 10 mg/L | 160% |
| February 2026 | B01 | Chromium, hexavalent [as Cr], daily maximum | .025 mg/L | ≤ .016 mg/L | 56% |
| February 2026 | B01 | Mercury, total [as Hg], annual average | 20.61 ng/L | ≤ 12 ng/L | 72% |
| March 2026 | 001 | BOD, 5-day, 20 deg. C, monthly average | 45 mg/L | ≤ 30 mg/L | 50% |
| March 2026 | 001 | BOD, 5-day, 20 deg. C, weekly average | 74 mg/L | ≤ 45 mg/L | 64% |
| March 2026 | 001 | Solids, total suspended, monthly average | 39 mg/L | ≤ 30 mg/L | 30% |
| March 2026 | 001 | Solids, total suspended, weekly average | 56 mg/L | ≤ 45 mg/L | 24% |
| March 2026 | B01 | BOD, carbonaceous [5 day, 20 C], daily maximum | 25 mg/L | ≤ 20 mg/L | 25% |
| March 2026 | B01 | BOD, carbonaceous [5 day, 20 C], monthly average | 15.8 mg/L | ≤ 10 mg/L | 58% |
| March 2026 | B01 | Mercury, total [as Hg], annual average | 20.2 ng/L | ≤ 12 ng/L | 68% |
| April 2026 | B01 | Mercury, total [as Hg], annual average | 20.53 ng/L | ≤ 12 ng/L | 71% |
| April 2026 | B01 | Nitrogen, ammonia total [as N], monthly average | 1.63 mg/L | ≤ 1.5 mg/L | 9% |
| May 2026 | B01 | Mercury, total [as Hg], annual average | 20.4 ng/L | ≤ 12 ng/L | 70% |
| May 2026 | B01 | Nitrogen, ammonia total [as N], monthly average | 1.8 mg/L | ≤ 1.5 mg/L | 20% |
| June 2026 | 001 | Solids, total suspended, monthly average | 46.63 mg/L | ≤ 30 mg/L | 55% |
| June 2026 | B01 | Mercury, total [as Hg], annual average | 20.5 ng/L | ≤ 12 ng/L | 71% |
| June 2026 | B01 | Nitrogen, ammonia total [as N], monthly average | 1.97 mg/L | ≤ 1.5 mg/L | 31% |
| July 2026 | 001 | BOD, 5-day, 20 deg. C, monthly average | 36 mg/L | ≤ 30 mg/L | 20% |
| July 2026 | 001 | BOD, 5-day, 20 deg. C, weekly average | 59 mg/L | ≤ 45 mg/L | 31% |
| July 2026 | B01 | BOD, carbonaceous [5 day, 20 C], daily maximum | 48 mg/L | ≤ 20 mg/L | 140% |
| July 2026 | B01 | BOD, carbonaceous [5 day, 20 C], monthly average | 22 mg/L | ≤ 10 mg/L | 120% |
| July 2026 | B01 | Mercury, total [as Hg], annual average | 18 ng/L | ≤ 12 ng/L | 50% |
| July 2026 | B01 | Nitrogen, ammonia total [as N], monthly average | 2.33 mg/L | ≤ 1.5 mg/L | 55% |
| August 2026 | B01 | Mercury, total [as Hg], annual average | 15.8 ng/L | ≤ 12 ng/L | 32% |
| August 2026 | B01 | Nitrogen, ammonia total [as N], monthly average | 1.97 mg/L | ≤ 1.5 mg/L | 31% |
| September 2026 | 001 | Solids, total suspended, monthly average | 35 mg/L | ≤ 30 mg/L | 17% |
| September 2026 | 001 | Solids, total suspended, weekly average | 62 mg/L | ≤ 45 mg/L | 38% |
| September 2026 | B01 | BOD, carbonaceous [5 day, 20 C], daily maximum | 38 mg/L | ≤ 20 mg/L | 90% |
| September 2026 | B01 | BOD, carbonaceous [5 day, 20 C], monthly average | 19 mg/L | ≤ 10 mg/L | 90% |
| September 2026 | B01 | Chromium, hexavalent [as Cr], daily maximum | .025 mg/L | ≤ .016 mg/L | 56% |
| September 2026 | B01 | Chromium, hexavalent [as Cr], monthly average | .017 mg/L | ≤ .011 mg/L | 55% |
| September 2026 | B01 | Mercury, total [as Hg], annual average | 19 ng/L | ≤ 12 ng/L | 58% |
| September 2026 | B01 | Nitrogen, ammonia total [as N], monthly average | 2.07 mg/L | ≤ 1.5 mg/L | 38% |
| September 2026 | B01 | Solids, total suspended, daily maximum | 59 mg/L | ≤ 24 mg/L | 146% |
| September 2026 | B01 | Solids, total suspended, monthly average | 22 mg/L | ≤ 12 mg/L | 83% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | monthly average minimum | report only (mg/L) | all year | 001 |
| Oxygen, dissolved [DO] | minimum weekly average | report only (mg/L) | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | all year | 001 |
| pH | minimum | ≥ 6 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Mar, Apr, May, Sep, Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Jun–Aug | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Jan, Feb, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 9.8 mg/L | Mar, Apr, May, Sep, Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.7 mg/L | Jun–Aug | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.9 mg/L | Jan, Feb, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (lb/d) | Mar, Apr, May, Sep, Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (lb/d) | Jun–Aug | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (lb/d) | Jan, Feb, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 306 lb/d | Mar, Apr, May, Sep, Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 335 lb/d | Jun–Aug | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 153 lb/d | Jan, Feb, Nov, Dec | 001 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ .75 mg/L | all year | 001 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 001 |
| Overflows | monthly total | report only (#/mo) | all year | 002 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | A01 |
| pH | minimum | ≥ 6 SU | all year | A01 |
| pH | maximum | ≤ 9 SU | all year | A01 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | A01 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | A01 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | A01 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | A01 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | A01 |
| Coliform, fecal general | daily maximum | ≤ 400 #/100mL | all year | A01 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | A01 |
| Oxygen, dissolved [DO] | monthly average minimum | ≥ 5.5 mg/L | Jan, Feb, Aug, Sep, Oct, Nov, Dec | B01 |
| Oxygen, dissolved [DO] | minimum weekly average | ≥ 4 mg/L | Jan, Feb, Aug, Sep, Oct, Nov, Dec | B01 |
| Oxygen, dissolved [DO] | minimum weekly average | ≥ 6 mg/L | Mar–Jul | B01 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 3.5 mg/L | Jan, Feb, Aug, Sep, Oct, Nov, Dec | B01 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 5 mg/L | Mar–Jul | B01 |
| pH | minimum | ≥ 6 SU | all year | B01 |
| pH | maximum | ≤ 9 SU | all year | B01 |
| Solids, total suspended | monthly average | ≤ 12 mg/L | all year | B01 |
| Solids, total suspended | daily maximum | ≤ 24 mg/L | all year | B01 |
| Solids, total suspended | monthly average | ≤ 375 lb/d | all year | B01 |
| Solids, total suspended | daily maximum | ≤ 751 lb/d | all year | B01 |
| Oil & Grease | daily maximum | report only (mg/L) | all year | B01 |
| Oil & Grease | daily maximum | report only (mg/L) | all year | B01 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | B01 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2 mg/L | Mar | B01 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 4 mg/L | Jan, Feb, Nov, Dec | B01 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.5 mg/L | Apr, May, Sep, Oct | B01 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.5 mg/L | Jun–Aug | B01 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 9.6 mg/L | Mar | B01 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.9 mg/L | Jan, Feb, Nov, Dec | B01 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 9.6 mg/L | Apr, May, Sep, Oct | B01 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.7 mg/L | Jun–Aug | B01 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 63 lb/d | Mar | B01 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 125 lb/d | Jan, Feb, Nov, Dec | B01 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 47 lb/d | Apr, May, Sep, Oct | B01 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 47 lb/d | Jun–Aug | B01 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 300 lb/d | Mar | B01 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 153 lb/d | Jan, Feb, Nov, Dec | B01 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 300 lb/d | Apr, May, Sep, Oct | B01 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 335 lb/d | Jun–Aug | B01 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 4.9 mg/L | Apr, May, Sep, Oct | B01 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 3.8 mg/L | Jun–Aug | B01 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 4.9 mg/L | Mar | B01 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 153 lb/d | Apr, May, Sep, Oct | B01 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 119 lb/d | Jun–Aug | B01 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 153 lb/d | Mar | B01 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | B01 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | B01 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | B01 |
| Cyanide, free [amenable to chlorination] | daily maximum | report only (ug/L) | all year | B01 |
| Cyanide, free [amenable to chlorination] | daily maximum | report only (ug/L) | all year | B01 |
| Fluoride, total [as F] | daily maximum | report only (mg/L) | all year | B01 |
| Fluoride, total [as F] | daily maximum | report only (mg/L) | all year | B01 |
| Arsenic, total [as As] | daily maximum | report only (mg/L) | all year | B01 |
| Arsenic, total [as As] | daily maximum | report only (mg/L) | all year | B01 |
| Barium, total [as Ba] | daily maximum | report only (mg/L) | all year | B01 |
| Barium, total [as Ba] | daily maximum | report only (mg/L) | all year | B01 |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | all year | B01 |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | all year | B01 |
| Chromium, hexavalent [as Cr] | monthly average | ≤ .011 mg/L | all year | B01 |
| Chromium, hexavalent [as Cr] | daily maximum | ≤ .016 mg/L | all year | B01 |
| Chromium, hexavalent [as Cr] | daily maximum | report only (mg/L) | all year | B01 |
| Chromium, hexavalent [as Cr] | daily maximum | report only (mg/L) | all year | B01 |
| Chromium, hexavalent [as Cr] | monthly average | ≤ .34 lb/d | all year | B01 |
| Chromium, hexavalent [as Cr] | daily maximum | ≤ .5 lb/d | all year | B01 |
| Chromium, total [as Cr] | daily maximum | report only (mg/L) | all year | B01 |
| Chromium, total [as Cr] | daily maximum | report only (mg/L) | all year | B01 |
| Copper, total [as Cu] | monthly average | ≤ .0222 mg/L | all year | B01 |
| Copper, total [as Cu] | daily maximum | ≤ .0355 mg/L | all year | B01 |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year | B01 |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year | B01 |
| Copper, total [as Cu] | monthly average | ≤ .69 lb/d | all year | B01 |
| Copper, total [as Cu] | daily maximum | ≤ 1.11 lb/d | all year | B01 |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | all year | B01 |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | all year | B01 |
| Iron, dissolved [as Fe] | daily maximum | report only (mg/L) | all year | B01 |
| Iron, dissolved [as Fe] | daily maximum | report only (mg/L) | all year | B01 |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | all year | B01 |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | all year | B01 |
| Manganese, total [as Mn] | daily maximum | report only (mg/L) | all year | B01 |
| Manganese, total [as Mn] | daily maximum | report only (mg/L) | all year | B01 |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | all year | B01 |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | all year | B01 |
| Silver, total [as Ag] | daily maximum | report only (mg/L) | all year | B01 |
| Silver, total [as Ag] | daily maximum | report only (mg/L) | all year | B01 |
| Zinc, total [as Zn] | monthly average | ≤ .0592 mg/L | all year | B01 |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | all year | B01 |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | all year | B01 |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | all year | B01 |
| Zinc, total [as Zn] | monthly average | ≤ 1.85 lb/d | all year | B01 |
| Zinc, total [as Zn] | daily maximum | report only (lb/d) | all year | B01 |
| Selenium, total [as Se] | daily maximum | report only (mg/L) | all year | B01 |
| Selenium, total [as Se] | daily maximum | report only (mg/L) | all year | B01 |
| Phenolics, total recoverable | daily maximum | report only (mg/L) | all year | B01 |
| Phenolics, total recoverable | daily maximum | report only (mg/L) | all year | B01 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | B01 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | B01 |
| Chlorine, total residual | daily maximum | ≤ .038 mg/L | all year | B01 |
| Mercury, total [as Hg] | monthly average | report only (ng/L) | all year | B01 |
| Mercury, total [as Hg] | annual average | ≤ 12 ng/L | all year | B01 |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | all year | B01 |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | all year | B01 |
| Coliform, fecal general | daily maximum | report only (#/100mL) | May–Oct | B01 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 10 mg/L | all year | B01 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 20 mg/L | all year | B01 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 313 lb/d | all year | B01 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 626 lb/d | all year | B01 |
| 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 |
| 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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