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MDNR

Fish Hatcheries And Preserves, Altura, Minnesota. NPDES permit MN0004421, in force until Jan 31, 2030. Last 12 months: over a limit 4 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 47 days after each period: form A1 monthly (21 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
3 values over a limit, 0 required values missing, 0 of 12 reports late

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

Period endingParameterReportedLimitOver by
August 2026BOD, carbonaceous [5 day, 20 C], daily maximum58.4≤ 50 mg/L17%
August 2026BOD, carbonaceous [5 day, 20 C], daily maximum650≤ 605 kg/d7%
August 2026BOD, carbonaceous [5 day, 20 C], monthly average30.85≤ 25 mg/L23%
August 2026BOD, carbonaceous [5 day, 20 C], monthly average335≤ 255 kg/d31%

Limits in force (25)

ParameterStatisticLimitMonths
Temperature, water deg. centigrademonthly averagereport only (deg C)all year
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
pHinstantaneous minimum≥ 6.5 SUall year
pHinstantaneous maximum≤ 8.5 SUall year
Solids, total suspendedmonthly average≤ 30 mg/LApr–Sep
Solids, total suspendedmonthly average≤ 30 mg/LJan, Feb, Mar, Oct, Nov, Dec
Solids, total suspendeddaily maximum≤ 60 mg/LApr–Sep
Solids, total suspendeddaily maximum≤ 60 mg/LJan, Feb, Mar, Oct, Nov, Dec
Solids, total suspendedmonthly average≤ 242.3 kg/dApr–Sep
Solids, total suspendedmonthly average≤ 306 kg/dJan, Feb, Mar, Oct, Nov, Dec
Solids, total suspendeddaily maximum≤ 726 kg/dJan, Feb, Mar, Oct, Nov, Dec
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year
Nitrite + Nitrate total [as N]monthly average≤ 10 mg/Lall year
Nitrite + Nitrate total [as N]monthly average≤ 121.13 kg/dall year
Phosphorus, total [as P]monthly averagereport only (mg/L)Mar, Jun, Sep, Dec
Sulfate, total [as SO4]quarterly maximumreport only (mg/L)Mar, Jun, Sep, Dec
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall year
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 50 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 255 kg/dall year
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 605 kg/dall year

How strict are these limits?

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

Same industry: the 4 Fishing, Hunting and Trapping permits in Minnesota.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MN0004421 · MCP: https://passage-data.com/mcp