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Industrial Inorganic Chemicals, Havre De Grace, Maryland. NPDES permit MD0000531, in force until Jun 30, 2027. Last 12 months: over a limit 3 times (last December 2025), 1 required value missing. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit |
|---|---|---|---|
| October 2025 | pH, maximum | 8.55 SU | ≤ 8.5 SU |
| November 2025 | pH, maximum | 9.02 SU | ≤ 8.5 SU |
| December 2025 | pH, maximum | 9.53 SU | ≤ 8.5 SU |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 8.5 SU | all year | 001 |
| Flow | monthly average | report only (gal/d) | all year | 001 |
| Flow | daily maximum | report only (gal/d) | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 002 |
| pH | minimum | ≥ 6.5 SU | all year | 002 |
| pH | maximum | ≤ 8.5 SU | all year | 002 |
| pH | maximum | ≤ 8.5 SU | 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 |
| pH | minimum | report only (SU) | all year | 003 |
| pH | maximum | report only (SU) | all year | 003 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 003 |
| Solids, total suspended | daily maximum | ≤ 40 mg/L | all year | 003 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 003 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | all year | 003 |
| Nitrogen, total [as N] | daily maximum | report only (lb/d) | all year | 003 |
| Nitrogen, total [as N] | monthly total | report only (lb/mo) | all year | 003 |
| Nitrogen, total [as N] | cumulative total | report only (lb/yr) | all year | 003 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Nitrogen, ammonia total [as N] | monthly average | report only (lb/d) | all year | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (lb/d) | all year | 003 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 003 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Nitrite + Nitrate total [as N] | monthly average | report only (lb/d) | all year | 003 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (lb/d) | all year | 003 |
| Nitrogen, inorganic total | monthly average | report only (mg/L) | all year | 003 |
| Nitrogen, inorganic total | daily maximum | report only (mg/L) | all year | 003 |
| Nitrogen, inorganic total | monthly average | report only (lb/d) | all year | 003 |
| Nitrogen, inorganic total | daily maximum | report only (lb/d) | all year | 003 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 003 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 003 |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | all year | 003 |
| Phosphorus, total [as P] | cumulative total | report only (lb/yr) | all year | 003 |
| Phosphorus, total [as P] | daily maximum | report only (lb/d) | all year | 003 |
| Phosphorus, total [as P] | monthly total | report only (lb/mo) | all year | 003 |
| Aluminum, total [as Al] | daily maximum | report only (mg/L) | all year | 003 |
| Aluminum, total [as Al] | daily maximum | report only (mg/L) | all year | 003 |
| Flow | monthly average | report only (MGD) | all year | 003 |
| Flow | daily maximum | report only (MGD) | all year | 003 |
| Sulfate | monthly average | report only (mg/L) | all year | 003 |
| Sulfate | daily maximum | report only (mg/L) | all year | 003 |
| Sulfate | daily maximum | ≤ 155182 lb/d | all year | 003 |
| Flow, total | total | report only (Mgal/mo) | all year | 003 |
| pH range excursions, > 60 minutes | monthly total | ≤ 0 occur/mo | all year | 003 |
| pH range excursions, monthly total accum | monthly total | ≤ 446 min | all year | 003 |
Cited limits by parameter: Maryland's rules and the federal ones.
Same industry: the 7 Chemicals and Allied Products permits in Maryland.
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