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Troutdale, City of

Sewage treatment plant, major discharger, Troutdale, Oregon. NPDES permit OR0020524, in force until Jul 31, 2028. Last 12 months: over a limit 2 times (last August 2026), 2 of 40 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (29 values), form G monthly (8 values)
Renewal application due
Feb 2, 2028 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
3 values over a limit, 3 required values missing, 1 of 28 reports late

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

Period endingParameterReportedLimitOver by
March 2026pH range excursions, > 60 minutes, total1 occur/mo≤ 0 occur/mo—
August 2026Solids, total suspended, weekly average17 mg/L≤ 15 mg/L13%

Limits in force (47)

ParameterStatisticLimitMonths
Temperature, water deg. centigrademonthly averagereport only (deg C)all year
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
Temperature, water deg. centigrademaximum 7-day averagereport only (deg C)all year
pHmonthly minimumreport only (SU)all year
pHdaily minimum≥ 6 SUall year
pHmonthly maximumreport only (SU)all year
pHdaily maximum≤ 9 SUall year
pHmonthly minimumreport only (SU)all year
pHdaily minimum≥ 6 SU (alert, not enforceable)all year
pHmonthly maximumreport only (SU)all year
pHdaily maximum≤ 9 SU (alert, not enforceable)all year
Solids, total suspendedmonthly average≤ 30 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
Solids, total suspendedmonthly average≤ 10 mg/LJun–Oct
Solids, total suspendedmonthly average≤ 1000 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
Solids, total suspendedmonthly average≤ 250 lb/dJun–Oct
Solids, total suspendeddaily maximum≤ 2000 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
Solids, total suspendeddaily maximum≤ 500 lb/dJun–Oct
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedweekly average≤ 45 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
Solids, total suspendedweekly average≤ 15 mg/LJun–Oct
Solids, total suspendedweekly average≤ 1500 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
Solids, total suspendedweekly average≤ 370 lb/dJun–Oct
Nitrogen, ammonia total [as N]monthly maximumreport only (mg/L)all year
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 averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all 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
Excess thermal loadmaximum 7-day average≤ 58.3 mkcal/dayMay–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/LJun–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 850 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 250 lb/dJun–Oct
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 1700 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 500 lb/dJun–Oct
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 40 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
BOD, carbonaceous [5 day, 20 C]weekly average≤ 15 mg/LJun–Oct
BOD, carbonaceous [5 day, 20 C]weekly average≤ 1300 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
BOD, carbonaceous [5 day, 20 C]weekly average≤ 370 lb/dJun–Oct
BOD, carb-5 day, 20 deg C, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year
pH range excursions, > 60 minutestotal≤ 0 occur/moall year
pH range excursions, monthly total accumtotal≤ 446 minall 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/OR0020524 · MCP: https://passage-data.com/mcp