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Swinomish Indian Tribal Commun

Sewage treatment plant, Anacortes, Washington. NPDES permit WA0025062 expired Jun 30, 2017; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 10 days after each period: form A monthly (23 values), form Q quarterly (4 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 1 of 18 reports late

Limits in force (38)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigrademonthly maximumreport only (deg C)all year001
Oxygen, dissolved [DO]quarterly minimumreport only (mg/L)all year001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 12.51 lb/dall year001
BOD, 5-day, 20 deg. Cweekly average≤ 18.77 lb/dall year001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year001
pHinstantaneous minimum≥ 6 SUall year001
pHinstantaneous maximum≤ 9 SUall year001
Alkalinity, total [as CaCO3]quarterly maximumreport only (mg/L)all year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 12.51 lb/dall year001
Solids, total suspendedweekly average≤ 18.77 lb/dall year001
Solids, total suspendedmonthly averagereport only (mg/L)all year001
Nitrogen, ammonia total [as N]quarterly maximumreport only (mg/L)all year001
Nitrogen, Kjeldahl, total [as N]quarterly maximumreport only (mg/L)all year001
Nitrite + Nitrate total [as N]quarterly maximumreport only (mg/L)all year001
Phosphorus, total [as P]quarterly maximumreport only (mg/L)all year001
Fecal coliform, MPN, EC med, 44.5 Cmonthly geometric mean≤ 14 #/100mLall year001
Fecal coliform, MPN, EC med, 44.5 Cweekly geometric mean≤ 14 #/100mLall year001
Floating solids, waste or visible foam-visualmaximum≤ 0 N=0;Y=1all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantinstantaneous maximumreport only (MGD)all year001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
Oil and grease visualquarterly maximum≤ 0 N=0;Y=1all year001
Temperature, water deg. centigrademaximum single samplereport only (deg C)Aug, NovREC
Turbiditymaximum single samplereport only (NTU)Aug, NovREC
Oxygen, dissolved [DO]instantaneous minimumreport only (mg/L)Aug, NovREC
pHinstantaneous minimumreport only (SU)Aug, NovREC
pHinstantaneous maximumreport only (SU)Aug, NovREC
Salinityinstantaneous minimumreport only (ppk)Aug, NovREC
Salinityinstantaneous maximumreport only (ppk)Aug, NovREC
Nitrogen, total [as N]maximum single samplereport only (mg/L)Aug, NovREC
Nitrogen, ammonia total [as N]maximum single samplereport only (mg/L)Aug, NovREC
Phosphorus, total [as P]maximum single samplereport only (mg/L)Aug, NovREC
Solids, total dissolvedmaximum single samplereport only (mg/L)Aug, NovREC

How strict are these limits?

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

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/WA0025062 · MCP: https://passage-data.com/mcp