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Blast Furnaces And Steel Mills, Seattle, Washington. NPDES permit WA0031305 expired Feb 28, 2026; its terms still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Temperature, water deg. centigrade | daily maximum | report only (deg C) (alert, not enforceable) | all year |
| pH | daily minimum | ≥ 6 SU | all year |
| pH | daily maximum | ≤ 9 SU | all year |
| Oil and grease, hexane extr method | daily maximum | report only (mg/L) (alert, not enforceable) | all year |
| Copper, total [as Cu] | daily maximum | report only (ug/L) (alert, not enforceable) | all year |
| Lead, total [as Pb] | daily maximum | report only (ug/L) (alert, not enforceable) | all year |
| Zinc, total [as Zn] | daily maximum | report only (ug/L) (alert, not enforceable) | all year |
| Polychlorinated biphenyls [PCBs] | average | ≤ .05 ug/L | all year |
| Flow | daily maximum | report only (gal/d) (alert, not enforceable) | all year |
Cited limits by parameter: Washington's rules and the federal ones.
Same industry: the 8 Primary Metal Industries permits in Washington.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/WA0031305 · MCP: https://passage-data.com/mcp