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Gypsum Products, East Shoals, Indiana. NPDES permit IN0003646, in force until Feb 29, 2028. Last 12 months: over a limit once (last November 2025), 1 required value missing, 1 of 64 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| November 2025 | Sulfate, total [as SO4], monthly average | 2473.3 mg/L | ≤ 2300 mg/L | 8% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | daily average minimum | ≥ 5 mg/L | May–Nov | 001 |
| Oxygen, dissolved [DO] | daily average minimum | ≥ 6 mg/L | Jan, Feb, Mar, Apr, Dec | 001 |
| pH | daily minimum | ≥ 6 SU | all year | 001 |
| pH | daily maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 6.7 lb/d | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 10 lb/d | all year | 001 |
| Oil and grease, hexane extr method | monthly average | ≤ 10 mg/L | all year | 001 |
| Oil and grease, hexane extr method | daily maximum | ≤ 15 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 3 mg/L | Jan, Feb, Mar, Apr, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.5 mg/L | May–Nov | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6 mg/L | Jan, Feb, Mar, Apr, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3 mg/L | May–Nov | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .5 lb/d | Jan, Feb, Mar, Apr, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1 lb/d | May–Nov | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1 lb/d | Jan, Feb, Mar, Apr, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2 lb/d | May–Nov | 001 |
| Hardness, total [as CaCO3] | monthly average | report only (mg/L) | all year | 001 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 001 |
| Chloride [as Cl] | monthly average | report only (mg/L) | all year | 001 |
| Chloride [as Cl] | daily maximum | report only (mg/L) | all year | 001 |
| Sulfate, total [as SO4] | monthly average | ≤ 2300 mg/L | all year | 001 |
| Sulfate, total [as SO4] | daily maximum | ≤ 3950 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 |
| E. coli, colony forming units [CFU] | monthly geometric mean | ≤ 125 CFU/100mL | Apr–Oct | 001 |
| E. coli, colony forming units [CFU] | daily maximum | ≤ 235 CFU/100mL | Apr–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 10 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 15 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 3.3 lb/d | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 5 lb/d | all year | 001 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 001 |
| Streamflow | monthly average | report only (MGD) | all year | 002 |
| Streamflow | daily maximum | report only (MGD) | all year | 002 |
| pH | daily minimum | ≥ 6 SU | all year | 002 |
| pH | daily minimum | ≥ 6 SU | all year | 002 |
| pH | daily maximum | ≤ 9 SU | all year | 002 |
| pH | daily maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | all year | 002 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | all year | 002 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | all year | 002 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | all year | 002 |
| Oil and grease, hexane extr method | monthly average | ≤ 10 mg/L | all year | 002 |
| Oil and grease, hexane extr method | monthly average | ≤ 10 mg/L | all year | 002 |
| Oil and grease, hexane extr method | daily maximum | ≤ 15 mg/L | all year | 002 |
| Oil and grease, hexane extr method | daily maximum | ≤ 15 mg/L | all year | 002 |
| Hardness, total [as CaCO3] | monthly average | report only (mg/L) | all year | 002 |
| Hardness, total [as CaCO3] | monthly average | report only (mg/L) | all year | 002 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 002 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 002 |
| Chloride [as Cl] | monthly average | ≤ 470 mg/L | all year | 002 |
| Chloride [as Cl] | monthly average | ≤ 750 mg/L | all year | 002 |
| Chloride [as Cl] | daily maximum | ≤ 810 mg/L | all year | 002 |
| Chloride [as Cl] | daily maximum | ≤ 1300 mg/L | all year | 002 |
| Sulfate, total [as SO4] | monthly average | ≤ 2300 mg/L | all year | 002 |
| Sulfate, total [as SO4] | monthly average | ≤ 4500 mg/L | all year | 002 |
| Sulfate, total [as SO4] | daily maximum | ≤ 3950 mg/L | all year | 002 |
| Sulfate, total [as SO4] | daily maximum | ≤ 7700 mg/L | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| Effluent dilution ratio | daily maximum | ≤ .5 Ratio | all year | 002 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 002 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 002 |
| pH | daily minimum | ≥ 6 SU | all year | 003 |
| pH | daily maximum | ≤ 9 SU | all year | 003 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | all year | 003 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | all year | 003 |
| Oil and grease, hexane extr method | monthly average | ≤ 10 mg/L | all year | 003 |
| Oil and grease, hexane extr method | daily maximum | ≤ 15 mg/L | all year | 003 |
| Hardness, total [as CaCO3] | monthly average | report only (mg/L) | all year | 003 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 003 |
| Chloride [as Cl] | monthly average | ≤ 470 mg/L | all year | 003 |
| Chloride [as Cl] | daily maximum | ≤ 810 mg/L | all year | 003 |
| Sulfate, total [as SO4] | monthly average | ≤ 2300 mg/L | all year | 003 |
| Sulfate, total [as SO4] | daily maximum | ≤ 3950 mg/L | all year | 003 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 003 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 003 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 003 |
| pH | daily minimum | ≥ 6 SU | Jun, Dec | 004 |
| pH | daily minimum | ≥ 6 SU | Jun, Dec | 004 |
| pH | daily maximum | ≤ 9 SU | Jun, Dec | 004 |
| pH | daily maximum | ≤ 9 SU | Jun, Dec | 004 |
| Solids, total suspended | daily maximum | report only (mg/L) | Jun, Dec | 004 |
| Solids, total suspended | daily maximum | report only (mg/L) | Jun, Dec | 004 |
| Oil and grease, hexane extr method | daily maximum | report only (mg/L) | Jun, Dec | 004 |
| Oil and grease, hexane extr method | daily maximum | report only (mg/L) | Jun, Dec | 004 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | Jun, Dec | 004 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | Jun, Dec | 004 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | Jun, Dec | 004 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | Jun, Dec | 004 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Jun, Dec | 004 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Jun, Dec | 004 |
| Sulfate, total [as SO4] | daily maximum | report only (mg/L) | Jun, Dec | 004 |
| Sulfate, total [as SO4] | daily maximum | report only (mg/L) | Jun, Dec | 004 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | Jun, Dec | 004 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | Jun, Dec | 004 |
| Chemical Oxygen Demand [COD] | daily maximum | report only (mg/L) | Jun, Dec | 004 |
| Chemical Oxygen Demand [COD] | daily maximum | report only (mg/L) | Jun, Dec | 004 |
| Storm water flow | daily maximum | report only (MGD) | Jun, Dec | 004 |
| Storm water flow | daily maximum | report only (MGD) | Jun, Dec | 004 |
| pH | daily minimum | ≥ 6 SU | Jun, Dec | 005 |
| pH | daily minimum | ≥ 6 SU | Jun, Dec | 005 |
| pH | daily maximum | ≤ 9 SU | Jun, Dec | 005 |
| pH | daily maximum | ≤ 9 SU | Jun, Dec | 005 |
| Solids, total suspended | daily maximum | report only (mg/L) | Jun, Dec | 005 |
| Solids, total suspended | daily maximum | report only (mg/L) | Jun, Dec | 005 |
| Oil and grease, hexane extr method | daily maximum | report only (mg/L) | Jun, Dec | 005 |
| Oil and grease, hexane extr method | daily maximum | report only (mg/L) | Jun, Dec | 005 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | Jun, Dec | 005 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | Jun, Dec | 005 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | Jun, Dec | 005 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | Jun, Dec | 005 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Jun, Dec | 005 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Jun, Dec | 005 |
| Sulfate, total [as SO4] | daily maximum | report only (mg/L) | Jun, Dec | 005 |
| Sulfate, total [as SO4] | daily maximum | report only (mg/L) | Jun, Dec | 005 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | Jun, Dec | 005 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | Jun, Dec | 005 |
| Chemical Oxygen Demand [COD] | daily maximum | report only (mg/L) | Jun, Dec | 005 |
| Chemical Oxygen Demand [COD] | daily maximum | report only (mg/L) | Jun, Dec | 005 |
| Storm water flow | daily maximum | report only (MGD) | Jun, Dec | 005 |
| Storm water flow | daily maximum | report only (MGD) | Jun, Dec | 005 |
| pH | daily minimum | ≥ 6 SU | all year | 007 |
| pH | daily maximum | ≤ 9 SU | all year | 007 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | all year | 007 |
| Solids, total suspended | daily maximum | ≤ 40 mg/L | all year | 007 |
| Hardness, total [as CaCO3] | monthly average | report only (mg/L) | all year | 007 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 007 |
| Chloride [as Cl] | monthly average | report only (mg/L) | all year | 007 |
| Chloride [as Cl] | daily maximum | report only (mg/L) | all year | 007 |
| Sulfate, total [as SO4] | monthly average | report only (mg/L) | all year | 007 |
| Sulfate, total [as SO4] | daily maximum | report only (mg/L) | all year | 007 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 007 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 007 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 007 |
Cited limits by parameter: Indiana's rules and the federal ones.
Same industry: the 80 Stone, Clay, Glass and Concrete Products permits in Indiana.
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