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Aluminum Foundries, major discharger, Defiance, Ohio. NPDES permit OH0002666, in force until May 31, 2030. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| pH | daily minimum | ≥ 6.5 SU | all year | 001 |
| pH | daily maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 28.2 mg/L | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 92.6 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 97.7 kg/d | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 247 kg/d | all year | 001 |
| Oil and grease, hexane extr method | monthly average | ≤ 14.4 mg/L | all year | 001 |
| Oil and grease, hexane extr method | daily maximum | ≤ 21.3 mg/L | all year | 001 |
| Oil and grease, hexane extr method | monthly average | ≤ 27.9 kg/d | all year | 001 |
| Oil and grease, hexane extr method | daily maximum | ≤ 83.6 kg/d | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 28.1 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 13.7 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 133 kg/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 65.1 kg/d | May–Oct | 001 |
| Phosphorus, total [as P] | monthly average | ≤ 1 mg/L | all year | 001 |
| Phosphorus, total [as P] | weekly maximum | ≤ 1.5 mg/L | all year | 001 |
| Phosphorus, total [as P] | monthly average | ≤ 7.42 kg/d | all year | 001 |
| Phosphorus, total [as P] | weekly maximum | ≤ 11.2 kg/d | all year | 001 |
| Zinc, total recoverable | monthly average | report only (ug/L) | Mar, Jun, Aug, Dec | 001 |
| Zinc, total recoverable | daily maximum | report only (ug/L) | Mar, Jun, Aug, Dec | 001 |
| Copper, total recoverable | monthly average | report only (ug/L) | Mar, Jun, Aug, Dec | 001 |
| Copper, total recoverable | daily maximum | report only (ug/L) | Mar, Jun, Aug, Dec | 001 |
| Oil & grease severity | monthly average | report only (severity) | all year | 001 |
| Oil & grease severity | daily maximum | report only (severity) | 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 |
| Chlorine, total residual | daily maximum | ≤ .038 mg/L | all year | 001 |
| Mercury, total low level | monthly average | report only (ng/L) | all year | 001 |
| Mercury, total low level | daily maximum | report only (ng/L) | all year | 001 |
| Solids, total dissolved- 180 deg. C | monthly average | report only (mg/L) | Mar, Jun, Aug, Dec | 001 |
| Solids, total dissolved- 180 deg. C | daily maximum | report only (mg/L) | Mar, Jun, Aug, Dec | 001 |
| pH | daily minimum | report only (SU) | all year | 002 |
| pH | daily maximum | report only (SU) | all year | 002 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 002 |
| Selenium, total recoverable | monthly average | report only (ug/L) | all year | 002 |
| Selenium, total recoverable | daily maximum | report only (ug/L) | all year | 002 |
| Zinc, total recoverable | monthly average | report only (ug/L) | all year | 002 |
| Zinc, total recoverable | daily maximum | report only (ug/L) | all year | 002 |
| Lead, total recoverable | monthly average | report only (ug/L) | all year | 002 |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year | 002 |
| Copper, total recoverable | monthly average | report only (ug/L) | all year | 002 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 002 |
| Mercury, total low level | monthly average | report only (ng/L) | all year | 002 |
| Mercury, total low level | daily maximum | report only (ng/L) | all year | 002 |
| Bypass Volume | monthly average | report only (Mgal) | all year | 002 |
| Bypass Volume | daily maximum | report only (Mgal) | all year | 002 |
| Bypass of treatment | monthly average | report only (hr/mo) | all year | 002 |
| Bypass of treatment | daily maximum | report only (hr/mo) | all year | 002 |
| Parameter | New limit | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|
| Mercury, total low level, daily maximum | 0.008 kg/d | new | — | — |
| Mercury, total low level, daily maximum | 1700 ng/L | new | 0.81 ng/L (8 values) | 0.000476× |
| Mercury, total low level, monthly average | 0.000006 kg/d | new | — | — |
| Mercury, total low level, monthly average | 1.3 ng/L | new | 0.81 ng/L (8 values) | 0.623× |
Cited limits by parameter: Ohio's rules and the federal ones.
Same industry: the 56 Primary Metal Industries permits in Ohio.
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Your permit document is the final word. As JSON: /api/v1/permits/OH0002666 · MCP: https://passage-data.com/mcp