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U.S. Fish and Wildlife Service

Federal facility (Fish Hatcheries And Preserves), Erwin, Tennessee. NPDES permit TN0004677, in force until Mar 31, 2030. Last 12 months: over a limit once (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due: About 15 days after each period: form G monthly (9 values)
Last report on file: September 2026
Oct 2024 – Sep 2025: 0 values over a limit, 0 required values missing, 0 of 12 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period ending	Parameter	Reported	Limit	Over by
September 2026	Oxygen, dissolved [DO], minimum	6.82 mg/L	≥ 7 mg/L	3%

Limits in force (9)

Parameter	Statistic	Limit	Months
Oxygen, dissolved [DO]	minimum	≥ 7 mg/L	all year
pH	daily minimum	≥ 6 SU	all year
pH	maximum	≤ 9 SU	all year
Solids, total suspended	daily maximum	≤ 15 mg/L	all year
Solids, settleable	daily maximum	≤ .5 mL/L	all year
Nitrogen, ammonia total [as N]	monthly average	≤ 1.22 mg/L	all year
Nitrogen, ammonia total [as N]	daily maximum	≤ 5.62 mg/L	all year
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year

How strict are these limits?

Oxygen, dissolved [DO], minimum at least 7 mg/L — stricter than 100% of 20 other minor federal facilities nationwide
Solids, total suspended, daily maximum 15 mg/L — stricter than 91% of 147 other minor federal facilities nationwide; 3% have the same limit
Nitrogen, ammonia total [as N], monthly average 1.22 mg/L — stricter than 89% of 76 other minor federal facilities nationwide

Cited limits by parameter: Tennessee's rules and the federal ones.

Same industry: the 7 Fishing, Hunting and Trapping permits in Tennessee.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/TN0004677 · MCP: https://passage-data.com/mcp