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Wallowa, City of

Sewage treatment plant, Wallowa, Oregon. NPDES permit OR0020028, in force until May 31, 2028. Last 12 months: no values over a limit, 6 required values missing, 21 of 41 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (28 values), form G monthly (6 values), form Q quarterly (1 value), form RQ quarterly (2 values), form RW monthly (3 values)
Renewal application due
Dec 3, 2027 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 21 of 44 reports late

Limits in force (50)

ParameterStatisticLimitMonths
Temperature, water deg. centigrademonthly averagereport only (deg C)all year
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
Temperature, water deg. centigrademonthly averagereport only (deg C)all year
Temperature, water deg. centigrademaximum 7-day averagereport only (deg C)all year
Temperature, water deg. centigradeweekly maximumreport only (deg C)all year
Flow ratemonthly minimumreport only (cfs)all year
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/LJun–Oct
BOD, 5-day, 20 deg. Cmonthly average≤ 75 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
BOD, 5-day, 20 deg. Cmonthly average≤ 50 lb/dJun–Oct
BOD, 5-day, 20 deg. Cdaily maximum≤ 150 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
BOD, 5-day, 20 deg. Cdaily maximum≤ 100 lb/dJun–Oct
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/LJun–Oct
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
BOD, 5-day, 20 deg. Cweekly average≤ 75 lb/dJun–Oct
BOD, 5-day, 20 deg. Cweekly average≤ 115 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
pHmonthly minimumreport only (SU)all year
pHmonthly maximumreport only (SU)all year
Alkalinity, total [as CaCO3]valuereport only (mg/L)all year
Alkalinity, total [as CaCO3]valuereport only (mg/L)all year
Solids, total suspendedmonthly average≤ 85 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
Solids, total suspendedmonthly average≤ 85 mg/LJun–Oct
Solids, total suspendedmonthly average≤ 210 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
Solids, total suspendedmonthly average≤ 145 lb/dJun–Oct
Solids, total suspendeddaily maximum≤ 420 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
Solids, total suspendeddaily maximum≤ 290 lb/dJun–Oct
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedweekly average≤ 140 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
Solids, total suspendedweekly average≤ 140 mg/LJun–Oct
Solids, total suspendedweekly average≤ 315 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
Solids, total suspendedweekly average≤ 220 lb/dJun–Oct
Nitrogen, ammonia total [as N]monthly maximumreport only (mg/L)all year
Nitrogen, ammonia total [as N]quarterly 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
Chlorine, total residualmonthly average≤ .05 mg/Lall year
Chlorine, total residualdaily maximum≤ .12 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
Excess thermal loadmaximum 7-day average≤ 27.4 mkcal/dayall year
Depth of pond or reservoir in feetmonthly maximumreport only (ft)all year
Depth of pond or reservoir in feetweekly maximumreport only (ft)all year
Chlorine usagedaily maximumreport 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/OR0020028 · MCP: https://passage-data.com/mcp