City of Portland

NPDES permit TN0021865 · Major POTW · effective, expires 2029-08-31 · EPA's file as of 2026-09-19

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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.

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

25values over a limit
7required values missing, on 5 form(s)
8of 23 forms filed late

Last period with anything received: 2026-08-31. Most often over: SSO, Dry Weather (9), SSO, Wet Weather (8), Nitrogen, ammonia total [as N] (5).

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 (60)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]INST MIN >= 6 mg/L all year
001pHMINIMUM >= 6 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspendedMO AVG <= 30 mg/L all year
001Solids, total suspendedWKLY AVG <= 40 mg/L all year
001Solids, total suspendedDAILY MX <= 45 mg/L all year
001Solids, total suspendedMO AVG <= 475 lb/d all year
001Solids, total suspendedWKLY AVG <= 634 lb/d all year
001Solids, settleableDAILY MX <= 1 mL/L all year
001Nitrogen, total [as N]MO AVG <= 7.3 mg/L all year
001Nitrogen, total [as N]WKLY AVG <= 10.95 mg/L all year
001Nitrogen, total [as N]DAILY MX <= 14.6 mg/L all year
001Nitrogen, total [as N]MO AVG <= 115.7 lb/d all year
001Nitrogen, total [as N]WKLY AVG <= 173.5 lb/d all year
001Nitrogen, ammonia total [as N]MO AVG <= .7 mg/L May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MO AVG <= 1.5 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, ammonia total [as N]WKLY AVG <= 1 mg/L May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]WKLY AVG <= 2.2 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 1.4 mg/L May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 3 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, ammonia total [as N]MO AVG <= 17 lb/d May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MO AVG <= 35 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, ammonia total [as N]WKLY AVG <= 25 lb/d May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]WKLY AVG <= 52 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001Phosphorus, total [as P]MO AVG <= 4.5 mg/L all year
001Phosphorus, total [as P]WKLY AVG <= 6.75 mg/L all year
001Phosphorus, total [as P]DAILY MX <= 9 mg/L all year
001Phosphorus, total [as P]MO AVG <= 71.3 lb/d all year
001Phosphorus, total [as P]WKLY AVG <= 107 lb/d all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Chlorine, total residualMO AVG <= .011 mg/L all year
001Chlorine, total residualDAILY MX <= .02 mg/L all year
001E. coliMO GEOMN <= 126 #/100mL all year
001E. coliDAILY MX <= 410 #/100mL all year
001SSO, Dry WeatherMO TOTAL <= 0 occur/mo all year
001SSO, Wet WeatherMO TOTAL <= 0 occur/mo all year
001Mercury, total [as Hg]MO AVG <= .00005 mg/L all year
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 15.7 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 10.5 mg/L May, Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 18.4 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 14.2 mg/L May, Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 25 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 20 mg/L May, Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 250 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 167 lb/d May, Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 292 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 225 lb/d May, Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous, percent removalDAILY MN >= 40 % all year
001BOD, carbonaceous, percent removalMO AV MN >= 85 % all year
001Solids, suspended percent removalDAILY MN >= 40 % all year
001Solids, suspended percent removalMO AV MN >= 85 % all year
001IC25 Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaMINIMUM > 97 % all year
001IC25 Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasMINIMUM > 97 % all year
INF1Solids, total suspendedMO AVG report only all year
INF1Solids, total suspendedDAILY MX report only all year
INF1Flow, in conduit or thru treatment plantMO AVG report only all year
INF1Flow, in conduit or thru treatment plantDAILY MX report only all year
INF1BOD, carbonaceous [5 day, 20 C]MO AVG report only all year
INF1BOD, carbonaceous [5 day, 20 C]DAILY MX report only all year

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