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Water Environment Services

Sewage treatment plant, major discharger, Milwaukie, Oregon. NPDES permit OR0026221 expired Dec 31, 2009; its limits still apply. Last 12 months: over a limit 3 times (last December 2025). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (30 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 1 of 12 reports late

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

Period endingParameterReportedLimitOver by
December 2025BOD, carbonaceous [5 day, 20 C], daily maximum6600 lb/d≤ 4200 lb/d57%
December 2025Solids, total suspended, daily maximum19000 lb/d≤ 5000 lb/d280%
December 2025Solids, total suspended, weekly average5100 lb/d≤ 3800 lb/d34%

Limits in force (46)

ParameterStatisticLimitMonths
Temperature, water deg. centigradedaily maximumreport only (deg C)May–Oct
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
pHdaily minimumreport only (SU)all year
pHdaily maximumreport only (SU)all year
Solids, total suspendedmonthly average≤ 20 mg/LMay–Oct
Solids, total suspendedmonthly average≤ 30 mg/LJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedmonthly average≤ 1700 lb/dMay–Oct
Solids, total suspendedmonthly average≤ 2500 lb/dJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendeddaily maximum≤ 3400 lb/dMay–Oct
Solids, total suspendeddaily maximum≤ 5000 lb/dJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedweekly average≤ 30 mg/LMay–Oct
Solids, total suspendedweekly average≤ 45 mg/LJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedweekly average≤ 2600 lb/dMay–Oct
Solids, total suspendedweekly average≤ 3800 lb/dJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 18.6 mg/LMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 28.3 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 33.9 mg/LMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 25.4 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 33 mg/LMay–Oct
Nitrogen, ammonia total [as N]daily maximum≤ 46.8 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 60.1 mg/LMay–Oct
Nitrogen, ammonia total [as N]daily maximum≤ 41.9 mg/LJan, Feb, Mar, Apr, Nov, Dec
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Chlorine, total residualmonthly average≤ .03 mg/Lall year
Chlorine, total residualdaily maximum≤ .08 mg/Lall year
E. colimonthly geometric mean≤ 126 #/100mLall year
E. colidaily maximum≤ 406 #/100mLall year
E. colimonthly geometric mean≤ 126 #/100mLall year
E. colidaily maximumreport only (#/100mL)all year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 15 mg/LMay–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 1300 lb/dMay–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 2100 lb/dJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 2600 lb/dMay–Oct
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 4200 lb/dJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]weekly average≤ 25 mg/LMay–Oct
BOD, carbonaceous [5 day, 20 C]weekly average≤ 40 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]weekly average≤ 2000 lb/dMay–Oct
BOD, carbonaceous [5 day, 20 C]weekly average≤ 3200 lb/dJan, Feb, Mar, Apr, Nov, Dec
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year
Chlorine usagemonthly averagereport only (lb/d)all year

How strict are these limits?

Cited limits by parameter: Oregon'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/OR0026221 · MCP: https://passage-data.com/mcp