Passage Data · Check a report · Use it from your AI
Blast Furnaces And Steel Mills, Knoxville, Tennessee. NPDES permit TN0027804, in force until Apr 30, 2027. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| pH | daily minimum | ≥ 6 SU | all year |
| pH | daily maximum | ≤ 9 SU | all year |
| Solids, total suspended | daily maximum | ≤ 40 mg/L | all year |
| Oil and grease, hexane extr method | monthly average | ≤ 10 mg/L | all year |
| Oil and grease, hexane extr method | daily maximum | ≤ 15 mg/L | all year |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.4 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.8 mg/L | May–Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.2 lb/d | May–Oct |
| Boron, total [as B] | daily maximum | ≤ 18.7 mg/L | all year |
| Cadmium, total [as Cd] | daily maximum | ≤ .0074 mg/L | all year |
| Copper, total [as Cu] | daily maximum | ≤ .041 mg/L | all year |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | all year |
| Manganese, total [as Mn] | daily maximum | ≤ 5 mg/L | all year |
| Silver, total [as Ag] | daily maximum | ≤ .00275 mg/L | all year |
| Zinc, dissolved [as Zn] | daily maximum | ≤ .42 mg/L | all year |
| Aluminum, total [as Al] | daily maximum | ≤ .96 mg/L | all year |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year |
Cited limits by parameter: Tennessee's rules and the federal ones.
Same industry: the 12 Primary Metal Industries permits in Tennessee.
· Save this facility as a site · Superfund sites nearby · Your permits on one board
On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/TN0027804 · MCP: https://passage-data.com/mcp