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Sewerage Systems, Stillwell, Indiana. NPDES permit IN0043184, in force until Jun 30, 2031. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| pH | daily minimum | ≥ 6 SU | Mar, Jun, Sep, Dec |
| pH | daily maximum | ≤ 9 SU | Mar, Jun, Sep, Dec |
| Solids, total suspended | monthly average | ≤ 7.5 mg/L | Mar, Jun, Sep, Dec |
| Solids, total suspended | maximum weekly average | ≤ 10 mg/L | Mar, Jun, Sep, Dec |
| Solids, total suspended | monthly average | ≤ 54 lb/d | Mar, Jun, Sep, Dec |
| Solids, total suspended | maximum weekly average | ≤ 72 lb/d | Mar, Jun, Sep, Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.3 mg/L | Jun, Sep |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.9 mg/L | Mar, Dec |
| Nitrogen, ammonia total [as N] | maximum weekly average | ≤ 1.9 mg/L | Jun, Sep |
| Nitrogen, ammonia total [as N] | maximum weekly average | ≤ 2.8 mg/L | Mar, Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 9.4 lb/d | Jun, Sep |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 13.7 lb/d | Mar, Dec |
| Nitrogen, ammonia total [as N] | maximum weekly average | ≤ 13.7 lb/d | Jun, Sep |
| Nitrogen, ammonia total [as N] | maximum weekly average | ≤ 20.2 lb/d | Mar, Dec |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | Mar, Jun, Sep, Dec |
| Flow, total | quarterly total | report only (Mgal/qtr) | Mar, Jun, Sep, Dec |
Cited limits by parameter: Indiana's rules and the federal ones.
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