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Riddle, City of

Sewage treatment plant, Riddle, Oregon. NPDES permit OR0020630 expired Mar 31, 2010; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (28 values), form N monthly (2 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
11 values over a limit, 21 required values missing, 3 of 18 reports late

Limits in force (46)

ParameterStatisticLimitMonths
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, 5-day, 20 deg. Cmonthly average≤ 62 lb/dJan, Feb, Mar, Apr, Nov, Dec
BOD, 5-day, 20 deg. Cdaily maximum≤ 120 lb/dJan, Feb, Mar, Apr, Nov, Dec
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, 5-day, 20 deg. Cweekly average≤ 93 lb/dJan, Feb, Mar, Apr, Nov, Dec
pHdaily minimum≥ 6 SUJan, Feb, Mar, Apr, Nov, Dec
pHdaily minimum≥ 6 SUMay–Oct
pHdaily maximum≤ 9 SUJan, Feb, Mar, Apr, Nov, Dec
pHdaily maximum≤ 8.5 SUMay–Oct
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≤ 10 mg/LMay–Oct
Solids, total suspendedmonthly average≤ 62 lb/dJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedmonthly average≤ 21 lb/dMay–Oct
Solids, total suspendeddaily maximum≤ 120 lb/dJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendeddaily maximum≤ 42 lb/dMay–Oct
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedweekly average≤ 15 mg/LMay–Oct
Solids, total suspendedweekly average≤ 45 mg/LJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedweekly average≤ 32 lb/dMay–Oct
Solids, total suspendedweekly average≤ 93 lb/dJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)May–Oct
Nitrogen, ammonia total [as N]monthly average≤ 7.3 mg/LMay–Oct
Nitrogen, ammonia total [as N]daily maximum≤ 15 mg/LMay–Oct
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Chlorine, total residualmonthly average≤ .1 mg/LJan, Feb, Mar, Apr, Nov, Dec
Chlorine, total residualmonthly average≤ .1 mg/LMay–Oct
Chlorine, total residualdaily maximum≤ .27 mg/LJan, Feb, Mar, Apr, Nov, Dec
Chlorine, total residualdaily maximum≤ .13 mg/LMay–Oct
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≤ 10 mg/LMay–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 21 lb/dMay–Oct
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 42 lb/dMay–Oct
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)May–Oct
BOD, carbonaceous [5 day, 20 C]weekly average≤ 15 mg/LMay–Oct
BOD, carbonaceous [5 day, 20 C]weekly average≤ 32 lb/dMay–Oct
BOD, carbonaceous, percent removalmonthly average minimum≥ 85 %May–Oct
BOD, 5-day, percent removalmonthly average minimum≥ 85 %Jan, Feb, Mar, Apr, Nov, Dec
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/OR0020630 · MCP: https://passage-data.com/mcp