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Clatskanie, City of

Sewage treatment plant, Clatskanie, Oregon. NPDES permit OR0020231 expired Jun 30, 2017; its limits still apply. Last 12 months: over a limit 4 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (32 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 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
December 2025Solids, total suspended, weekly average193.7 lb/d≤ 190 lb/d2%
March 2026BOD, 5-day, 20 deg. C, weekly average228 lb/d≤ 190 lb/d20%
June 2026Solids, total suspended, monthly average24.6 mg/L≤ 20 mg/L23%
June 2026Solids, total suspended, weekly average36.8 mg/L≤ 30 mg/L23%

Limits in force (42)

ParameterStatisticLimitMonths
Temperature, water deg. centigradedaily maximumreport only (deg C)May–Oct
Temperature, water deg. centigradeweekly averagereport only (deg C)May–Oct
Oxygen, dissolved [DO]monthly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, 5-day, 20 deg. Cmonthly average≤ 20 mg/LMay–Oct
BOD, 5-day, 20 deg. Cmonthly average≤ 120 lb/dJan, Feb, Mar, Apr, Nov, Dec
BOD, 5-day, 20 deg. Cmonthly average≤ 83 lb/dMay–Oct
BOD, 5-day, 20 deg. Cdaily maximum≤ 250 lb/dJan, Feb, Mar, Apr, Nov, Dec
BOD, 5-day, 20 deg. Cdaily maximum≤ 170 lb/dMay–Oct
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cweekly average≤ 30 mg/LMay–Oct
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, 5-day, 20 deg. Cweekly average≤ 120 lb/dMay–Oct
BOD, 5-day, 20 deg. Cweekly average≤ 190 lb/dJan, Feb, Mar, Apr, Nov, Dec
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≤ 30 mg/LJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedmonthly average≤ 20 mg/LMay–Oct
Solids, total suspendedmonthly average≤ 120 lb/dJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedmonthly average≤ 83 lb/dMay–Oct
Solids, total suspendeddaily maximum≤ 250 lb/dJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendeddaily maximum≤ 170 lb/dMay–Oct
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedweekly average≤ 45 mg/LJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedweekly average≤ 30 mg/LMay–Oct
Solids, total suspendedweekly average≤ 190 lb/dJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedweekly average≤ 120 lb/dMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 16.6 mg/Lall year
Nitrogen, ammonia total [as N]daily maximum≤ 33.3 mg/Lall year
Ultraviolet light intensitymonthly averagereport only (uW/cm2)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly averagereport 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 loadweekly average≤ 4.2 mkcal/dayMay–Oct
Ultraviolet light dosagemonthly averagereport only (mW-sec/cm2)all year
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %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/OR0020231 · MCP: https://passage-data.com/mcp