SILVERTON, CITY OF

NPDES permit OR0020656 · Major POTW · administratively continued, expires 2009-12-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

This permit expired on 2009-12-31 and is administratively continued: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

EPA's record, 2025-09-01 to 2026-08-31

2values over a limit
0required values missing, on 0 form(s)
15of 33 forms filed late

Last period with anything received: 2026-07-31. Most often over: Excess thermal load (2).

Reporting

Reports are due about 15 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (79)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. centigradeDAILY MX report only all year
001Temperature, water deg. centigradeWKLY AVG report only all year
001Oxygen, dissolved [DO]DAILY MN >= 6.5 mg/L May, Jun, Jul, Aug, Sep, Oct
001pHDAILY MN >= 6.5 SU all year
001pHDAILY MX <= 9 SU all year
001pHDAILY MN report only all year
001pHDAILY MX report only all year
001Solids, total suspendedMO AVG <= 10 mg/L May, Jun, Jul, Aug, Sep, Oct
001Solids, total suspendedMO AVG <= 30 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001Solids, total suspendedMO AVG <= 300 lb/d May, Jun, Jul, Aug, Sep, Oct
001Solids, total suspendedMO AVG <= 1300 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001Solids, total suspendedDAILY MX <= 420 lb/d May, Jun, Jul, Aug, Sep, Oct
001Solids, total suspendedDAILY MX <= 2200 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001Solids, total suspendedMO AVG report only all year
001Solids, total suspendedWKLY AVG <= 15 mg/L May, Jun, Jul, Aug, Sep, Oct
001Solids, total suspendedWKLY AVG <= 45 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001Solids, total suspendedWKLY AVG <= 330 lb/d May, Jun, Jul, Aug, Sep, Oct
001Solids, total suspendedWKLY AVG <= 1700 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, ammonia total [as N]MO AVG <= .88 mg/L May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MO AVG report only Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 2 mg/L May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, Kjeldahl, total [as N]MO AVG report only May, Jun, Jul, Aug, Sep, Oct
001Nitrite + Nitrate total [as N]MO AVG report only May, Jun, Jul, Aug, Sep, Oct
001Phosphorus, total [as P]MO AVG report only May, Jun, Jul, Aug, Sep, Oct
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001E. coliMO GEO <= 126 #/100mL all year
001E. coliDAILY MX <= 406 #/100mL all year
001E. coliMO GEO <= 126 #/100mL all year
001E. coliDAILY MX report only all year
001Excess thermal loadWKLY AVG <= 5.2 mkcal/day May, Jun, Jul, Aug, Sep, Oct
001Excess thermal loadWKLY AVG <= 21 mkcal/day Jan, Feb, Mar, Apr, Nov, Dec
001Ultraviolet light dosageMO AVG report only all year
001Ultraviolet light dosageDAILY MX report only all year
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 10 mg/L May, Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 25 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 300 lb/d May, Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 830 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 420 lb/d May, Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 1500 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001BOD, carbonaceous [5 day, 20 C]MO AVG report only all year
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 15 mg/L May, Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 40 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 330 lb/d May, Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 1100 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001BOD, carbonaceous, percent removalM5 >= 85 % all year
001Solids, suspended percent removalMO AV MN >= 85 % all year
002Oxygen, dissolved [DO]DAILY MN >= 5.5 mg/L all year
002pHDAILY MN >= 6.5 SU all year
002pHDAILY MX <= 8.5 SU all year
002Solids, total suspendedMO AVG <= 10 mg/L all year
002Solids, total suspendedMO AVG <= 300 lb/d all year
002Solids, total suspendedDAILY MX <= 420 lb/d all year
002Solids, total suspendedWKLY AVG <= 15 mg/L all year
002Solids, total suspendedWKLY AVG <= 330 lb/d all year
002Nitrogen, ammonia total [as N]MO AVG report only all year
002Nitrogen, ammonia total [as N]DAILY MX report only all year
002Nitrogen, Kjeldahl, total [as N]MO AVG report only all year
002Nitrite + Nitrate total [as N]MO AVG report only all year
002Phosphorus, total [as P]MO AVG report only all year
002Flow, in conduit or thru treatment plantMO AVG report only all year
002E. coliMO GEO <= 126 #/100mL all year
002E. coliDAILY MX <= 406 #/100mL all year
002E. coliMO GEO <= 126 #/100mL all year
002E. coliDAILY MX report only all year
002Ultraviolet light dosageMO AVG report only all year
002Ultraviolet light dosageDAILY MX report only all year
002BOD, carbonaceous [5 day, 20 C]MO AVG <= 10 mg/L all year
002BOD, carbonaceous [5 day, 20 C]MO AVG <= 300 lb/d all year
002BOD, carbonaceous [5 day, 20 C]DAILY MX <= 420 lb/d all year
002BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 15 mg/L all year
002BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 330 lb/d all year
002BOD, carbonaceous, percent removalMO AV MN >= 85 % all year
002Solids, suspended percent removalMO AV MN >= 85 % all year
RECTemperature, water deg. centigradeMO AVG report only all year
RECOxygen, dissolved [DO]DAILY MN report only all year
RECpHDAILY MN report only all year
RECpHDAILY MX report only all year
RECNitrogen, ammonia total [as N]MO AVG report only all year

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states