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Silverton, City of

Sewage treatment plant, major discharger, Silverton, Oregon. NPDES permit OR0020656 expired Dec 31, 2009; its limits still apply. Last 12 months: over a limit 2 times (last December 2025), 12 of 36 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (35 values), outfall 002 form A monthly (27 values), outfall REC form 1 monthly (5 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 65 required values missing, 30 of 36 reports late

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

Period endingParameterReportedLimitOver by
November 2025Excess thermal load, weekly average38.6 mkcal/day≤ 21 mkcal/day84%
December 2025Excess thermal load, weekly average21.5 mkcal/day≤ 21 mkcal/day2%

Limits in force (79)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigradedaily maximumreport only (deg C)all year001
Temperature, water deg. centigradeweekly averagereport only (deg C)all year001
Oxygen, dissolved [DO]daily minimum≥ 6.5 mg/LMay–Oct001
pHdaily minimum≥ 6.5 SUall year001
pHdaily maximum≤ 9 SUall year001
pHdaily minimumreport only (SU)all year001
pHdaily maximumreport only (SU)all year001
Solids, total suspendedmonthly average≤ 10 mg/LMay–Oct001
Solids, total suspendedmonthly average≤ 30 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Solids, total suspendedmonthly average≤ 300 lb/dMay–Oct001
Solids, total suspendedmonthly average≤ 1300 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Solids, total suspendeddaily maximum≤ 420 lb/dMay–Oct001
Solids, total suspendeddaily maximum≤ 2200 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Solids, total suspendedmonthly averagereport only (mg/L)all year001
Solids, total suspendedweekly average≤ 15 mg/LMay–Oct001
Solids, total suspendedweekly average≤ 45 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Solids, total suspendedweekly average≤ 330 lb/dMay–Oct001
Solids, total suspendedweekly average≤ 1700 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ .88 mg/LMay–Oct001
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 2 mg/LMay–Oct001
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)May–Oct001
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)May–Oct001
Phosphorus, total [as P]monthly averagereport only (mg/L)May–Oct001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
E. colimonthly geometric mean≤ 126 #/100mLall year001
E. colidaily maximum≤ 406 #/100mLall year001
E. colimonthly geometric mean≤ 126 #/100mLall year001
E. colidaily maximumreport only (#/100mL)all year001
Excess thermal loadweekly average≤ 5.2 mkcal/dayMay–Oct001
Excess thermal loadweekly average≤ 21 mkcal/dayJan, Feb, Mar, Apr, Nov, Dec001
Ultraviolet light dosagemonthly averagereport only (mW-sec/cm2)all year001
Ultraviolet light dosagedaily maximumreport only (mW-sec/cm2)all year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/LMay–Oct001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 300 lb/dMay–Oct001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 830 lb/dJan, Feb, Mar, Apr, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 420 lb/dMay–Oct001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 1500 lb/dJan, Feb, Mar, Apr, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 15 mg/LMay–Oct001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 40 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 330 lb/dMay–Oct001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 1100 lb/dJan, Feb, Mar, Apr, Nov, Dec001
BOD, carbonaceous, percent removalminimum≥ 85 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
Oxygen, dissolved [DO]daily minimum≥ 5.5 mg/Lall year002
pHdaily minimum≥ 6.5 SUall year002
pHdaily maximum≤ 8.5 SUall year002
Solids, total suspendedmonthly average≤ 10 mg/Lall year002
Solids, total suspendedmonthly average≤ 300 lb/dall year002
Solids, total suspendeddaily maximum≤ 420 lb/dall year002
Solids, total suspendedweekly average≤ 15 mg/Lall year002
Solids, total suspendedweekly average≤ 330 lb/dall year002
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year002
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year002
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year002
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year002
Phosphorus, total [as P]monthly averagereport only (mg/L)all year002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002
E. colimonthly geometric mean≤ 126 #/100mLall year002
E. colidaily maximum≤ 406 #/100mLall year002
E. colimonthly geometric mean≤ 126 #/100mLall year002
E. colidaily maximumreport only (#/100mL)all year002
Ultraviolet light dosagemonthly averagereport only (mW-sec/cm2)all year002
Ultraviolet light dosagedaily maximumreport only (mW-sec/cm2)all year002
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/Lall year002
BOD, carbonaceous [5 day, 20 C]monthly average≤ 300 lb/dall year002
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 420 lb/dall year002
BOD, carbonaceous [5 day, 20 C]weekly average≤ 15 mg/Lall year002
BOD, carbonaceous [5 day, 20 C]weekly average≤ 330 lb/dall year002
BOD, carbonaceous, percent removalmonthly average minimum≥ 85 %all year002
Solids, suspended percent removalmonthly average minimum≥ 85 %all year002
Temperature, water deg. centigrademonthly averagereport only (deg C)all yearREC
Oxygen, dissolved [DO]daily minimumreport only (mg/L)all yearREC
pHdaily minimumreport only (SU)all yearREC
pHdaily maximumreport only (SU)all yearREC
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all yearREC

How strict are these limits?

Cited limits by parameter: Oregon's rules and the federal ones.

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