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Monmouth, City of

Sewage treatment plant, Monmouth, Oregon. NPDES permit OR0020613, in force until Dec 31, 2030. Last 12 months: over a limit 2 times (last May 2026), 2 of 24 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (1 value), form G monthly (6 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 1 of 24 reports late

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

Period endingParameterReportedLimit
February 2026pH, daily maximum9.1 SU≤ 9 SU
May 2026pH, daily maximum10 SU≤ 9 SU

Limits in force (39)

ParameterStatisticLimitMonths
Temperature, water deg. centigrademonthly averagereport only (deg C)Jan, Feb, Mar, Apr, May, Nov, Dec
Temperature, water deg. centigradedaily maximumreport only (deg C)Jan, Feb, Mar, Apr, May, Nov, Dec
Temperature, water deg. centigrademaximum 7-day averagereport only (deg C)Jan, Feb, Mar, Apr, May, Nov, Dec
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
BOD, 5-day, 20 deg. Cmonthly average≤ 480 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
BOD, 5-day, 20 deg. Cdaily maximum≤ 960 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 45 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 720 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
pHdaily minimum≥ 6 SUJan, Feb, Mar, Apr, May, Nov, Dec
pHdaily maximum≤ 9 SUJan, Feb, Mar, Apr, May, Nov, Dec
pHmonthly minimumreport only (SU)all year
pHmonthly maximumreport only (SU)all year
Alkalinity, total [as CaCO3]quarterly maximumreport only (mg/L)Jan, Feb, Mar, Apr, May, Nov, Dec
Solids, total suspendedmonthly average≤ 50 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
Solids, total suspendedmonthly average≤ 790 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
Solids, total suspendeddaily maximum≤ 1600 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedmaximum weekly average≤ 75 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
Solids, total suspendedmaximum weekly average≤ 1200 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
Nitrogen, ammonia total [as N]monthly maximumreport only (mg/L)Jan, Feb, Mar, Apr, May, Nov, Dec
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)Jan, Feb, Mar, Apr, May, Nov, Dec
Flow, in conduit or thru treatment plantdaily maximum≤ 0 gal/dJun–Oct
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)Jan, Feb, Mar, Apr, May, Nov, Dec
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualmonthly average≤ .1 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
Chlorine, total residualdaily maximum≤ .11 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
E. colimonthly geometric mean≤ 126 #/100mLJan, Feb, Mar, Apr, May, Nov, Dec
E. colidaily maximum≤ 406 #/100mLJan, Feb, Mar, Apr, May, Nov, Dec
E. colimonthly geometric mean≤ 126 #/100mLJan, Feb, Mar, Apr, May, Nov, Dec
E. colidaily maximumreport only (#/100mL)Jan, Feb, Mar, Apr, May, Nov, Dec
Excess thermal loadmaximum 7-day average≤ 104.6 mkcal/dayApr, May
Excess thermal loadmaximum 7-day average≤ 69.6 mkcal/dayMay
Excess thermal loadmaximum 7-day average≤ 52.4 mkcal/dayNov
BOD, 5-day, percent removalmonthly average minimum≥ 85 %Jan, Feb, Mar, Apr, May, Nov, Dec
Solids, suspended percent removalmonthly average minimum≥ 65 %Jan, Feb, Mar, Apr, May, Nov, Dec
Chlorine usagemonthly averagereport only (lb/d)Jan, Feb, Mar, Apr, May, Nov, Dec
Chlorine usagedaily maximumreport only (lb/d)Jan, Feb, Mar, Apr, May, Nov, Dec

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/OR0020613 · MCP: https://passage-data.com/mcp