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Erik Hernandez - City of Unalaska

Sewage treatment plant, major discharger, Unalaska, Alaska. NPDES permit AK0043451 expired Feb 1, 2009; its limits still apply. Last 12 months: over a limit 3 times (last August 2026), 25 of 30 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 10 days after each period: form A monthly (18 values), form B monthly (4 values), form C monthly (7 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
4 values over a limit, 0 required values missing, 25 of 30 reports late

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

Period endingParameterReportedLimitOver by
January 2026Flow, in conduit or thru treatment plant, daily maximum1.212 MGD≤ .9 MGD35%
July 2026BOD, 5-day, 20 deg. C, monthly average145.9 mg/L≤ 140 mg/L4%
August 2026BOD, 5-day, 20 deg. C, monthly average149.6 mg/L≤ 140 mg/L7%

Limits in force (50)

ParameterStatisticLimitMonths
Temperature, water deg. centigrademaximumreport only (deg C)all year
Temperature, water deg. centigrademaximumreport only (deg C)Mar, Jun, Sep, Dec
Oxygen, dissolved [DO]minimum≥ 2 mg/Lall year
Oxygen, dissolved [DO]maximum≤ 17 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 140 mg/Lall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 200 mg/Lall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 468 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 700 lb/dall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 1501 lb/dall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 2343 lb/dall year
pHminimum≥ 6.5 SUall year
pHminimum≥ 6.5 SUMar, Jun, Sep, Dec
pHmaximum≤ 8.5 SUall year
pHmaximum≤ 8.5 SUMar, Jun, Sep, Dec
Solids, total suspendedmonthly average≤ 140 mg/Lall year
Solids, total suspendeddaily maximum≤ 200 mg/Lall year
Solids, total suspendeddaily maximum≤ 468 mg/Lall year
Solids, total suspendedmonthly average≤ 700 lb/dall year
Solids, total suspendeddaily maximum≤ 1501 lb/dall year
Solids, total suspendeddaily maximum≤ 2343 lb/dall year
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)Mar, Jun, Sep, Dec
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Mar, Jun, Sep, Dec
Hardness, total [as CaCO3]daily maximumreport only (ug/L)Jan, Jul
Hardness, total [as CaCO3]daily maximumreport only (mg/L)Jan, Jul
Arsenic, total [as As]daily maximumreport only (ug/L)Jan, Jul
Arsenic, total [as As]daily maximumreport only (ug/L)Jan, Jul
Chromium, total [as Cr]daily maximumreport only (ug/L)Jan, Jul
Chromium, total [as Cr]daily maximumreport only (ug/L)Jan, Jul
Copper, total [as Cu]daily maximumreport only (ug/L)Jan, Jul
Copper, total [as Cu]daily maximumreport only (ug/L)Jan, Jul
Iron, total [as Fe]daily maximumreport only (ug/L)Jan, Jul
Iron, total [as Fe]daily maximumreport only (ug/L)Jan, Jul
Zinc, total [as Zn]daily maximumreport only (ug/L)Jan, Jul
Zinc, total [as Zn]daily maximumreport only (ug/L)Jan, Jul
Fecal coliform, MPN, EC med, 44.5 Cmonthly average≤ 10000 #/100mLall year
Fecal coliform, MPN, EC med, 44.5 Cdaily maximum≤ 15000 #/100mLall year
Hydrocarbons, aromaticdaily maximum≤ 10 ug/Lall year
Hydrocarbons, aromaticdaily maximum≤ 10 ug/LMar, Jun, Sep, Dec
Flow, in conduit or thru treatment plantmonthly average≤ .6 MGDall year
Flow, in conduit or thru treatment plantdaily maximum≤ .9 MGDall year
Chlorine, total residualmonthly average≤ .17 mg/Lall year
Chlorine, total residualdaily maximum≤ .34 mg/Lall year
Hydrocarbon, aqueousdaily maximum≤ 15 ug/Lall year
Hydrocarbon, aqueousdaily maximum≤ 15 ug/LMar, Jun, Sep, Dec
Coliform, fecal generalmonthly average≤ 10000 #/100mLall year
Coliform, fecal generaldaily maximum≤ 15000 #/100mLall year
BOD, 5-day, percent removalminimum % removal≥ 30 %all year
Solids, suspended percent removalminimum % removal≥ 30 %all year

How strict are these limits?

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

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/AK0043451 · MCP: https://passage-data.com/mcp