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Minerals, Ground Or Treated, Mounds, Illinois. NPDES permit IL0077674, in force until Sep 30, 2028. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | monthly average minimum | ≥ 5.5 mg/L | Jan, Feb, Aug, Sep, Oct, Nov, Dec |
| Oxygen, dissolved [DO] | minimum weekly average | ≥ 4 mg/L | Jan, Feb, Aug, Sep, Oct, Nov, Dec |
| Oxygen, dissolved [DO] | minimum weekly average | ≥ 6 mg/L | Mar–Jul |
| Oxygen, dissolved [DO] | daily minimum | ≥ 3.5 mg/L | Jan, Feb, Aug, Sep, Oct, Nov, Dec |
| Oxygen, dissolved [DO] | daily minimum | ≥ 5 mg/L | Mar–Jul |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 30 mg/L | all year |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 60 mg/L | all year |
| pH | monthly minimum | ≥ 6 SU | all year |
| pH | monthly maximum | ≤ 9 SU | all year |
| Solids, total suspended | 30-day average | ≤ 30 mg/L | all year |
| Solids, total suspended | daily maximum | ≤ 60 mg/L | all year |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year |
| Mercury, total [as Hg] | annual average | ≤ .012 ug/L | all year |
| Mercury, total [as Hg] | monthly average | ≤ 1.3 ug/L | all year |
| Mercury, total [as Hg] | daily maximum | ≤ 2.6 ug/L | all year |
Cited limits by parameter: Illinois's rules and the federal ones.
Same industry: the 11 Stone, Clay, Glass and Concrete Products permits in Illinois.
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On EPA ECHO: Facility report · DMR history
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