PORTLAND WWTP

NPDES permit IN0020095 · Major POTW · effective, expires 2028-05-31 · 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.

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

0values over a limit
1required values missing, on 1 form(s)
1of 146 forms filed late

Last period with anything received: 2026-07-31.

Reporting

Reports are due about 29 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (107)

OutfallParameterStatisticLimitMonths
001DurationMO TOTAL report only all year
001Overflow volume [SS0 volume, CSO volume]MO TOTAL report only all year
001Precipitation, monthly accumulationMO TOTAL report only all year
001Discharge event observation [Visual Monitoring]MO TOTAL report only all year
002DurationMO TOTAL report only all year
002Overflow volume [SS0 volume, CSO volume]MO TOTAL report only all year
002Precipitation, monthly accumulationMO TOTAL report only all year
002Discharge event observation [Visual Monitoring]MO TOTAL report only all year
004DurationMO TOTAL report only all year
004Overflow volume [SS0 volume, CSO volume]MO TOTAL report only all year
004Precipitation, monthly accumulationMO TOTAL report only all year
004Discharge event observation [Visual Monitoring]MO TOTAL report only all year
005DurationMO TOTAL report only all year
005Overflow volume [SS0 volume, CSO volume]MO TOTAL report only all year
005Precipitation, monthly accumulationMO TOTAL report only all year
005Discharge event observation [Visual Monitoring]MO TOTAL report only all year
006DurationMO TOTAL report only all year
006Overflow volume [SS0 volume, CSO volume]MO TOTAL report only all year
006Precipitation, monthly accumulationMO TOTAL report only all year
006Discharge event observation [Visual Monitoring]MO TOTAL report only all year
007DurationMO TOTAL report only all year
007Overflow volume [SS0 volume, CSO volume]MO TOTAL report only all year
007Precipitation, monthly accumulationMO TOTAL report only all year
007Discharge event observation [Visual Monitoring]MO TOTAL report only all year
008DurationMO TOTAL report only all year
008Overflow volume [SS0 volume, CSO volume]MO TOTAL report only all year
008Precipitation, monthly accumulationMO TOTAL report only all year
008Discharge event observation [Visual Monitoring]MO TOTAL report only all year
009DurationMO TOTAL report only all year
009Overflow volume [SS0 volume, CSO volume]MO TOTAL report only all year
009Precipitation, monthly accumulationMO TOTAL report only all year
009Discharge event observation [Visual Monitoring]MO TOTAL report only all year
010DurationMO TOTAL report only all year
010Overflow volume [SS0 volume, CSO volume]MO TOTAL report only all year
010Precipitation, monthly accumulationMO TOTAL report only all year
010Discharge event observation [Visual Monitoring]MO TOTAL report only all year
012DurationMO TOTAL report only all year
012Overflow volume [SS0 volume, CSO volume]MO TOTAL report only all year
012Precipitation, monthly accumulationMO TOTAL report only all year
012Discharge event observation [Visual Monitoring]MO TOTAL report only all year
013DurationMO TOTAL report only all year
013Overflow volume [SS0 volume, CSO volume]MO TOTAL report only all year
013Precipitation, monthly accumulationMO TOTAL report only all year
013Discharge event observation [Visual Monitoring]MO TOTAL report only all year
014DurationMO TOTAL report only all year
014Overflow volume [SS0 volume, CSO volume]MO TOTAL report only all year
014Precipitation, monthly accumulationMO TOTAL report only all year
014Discharge event observation [Visual Monitoring]MO TOTAL report only all year
018Oxygen, dissolved [DO]DLYAVMIN >= 6 mg/L May, Jun, Jul, Aug, Sep, Oct, Nov
018Oxygen, dissolved [DO]DLYAVMIN >= 5 mg/L Jan, Feb, Mar, Apr, Dec
018pHDAILY MN >= 6 SU all year
018pHDAILY MX <= 9 SU all year
018Solids, total suspendedMO AVG <= 30 mg/L Jan, Feb, Mar, Apr, Dec
018Solids, total suspendedMO AVG <= 18 mg/L May, Jun, Jul, Aug, Sep, Oct, Nov
018Solids, total suspendedMX WK AV <= 45 mg/L Jan, Feb, Mar, Apr, Dec
018Solids, total suspendedMX WK AV <= 27 mg/L May, Jun, Jul, Aug, Sep, Oct, Nov
018Solids, total suspendedMO AVG <= 588 lb/d Jan, Feb, Mar, Apr, Dec
018Solids, total suspendedMO AVG <= 353 lb/d May, Jun, Jul, Aug, Sep, Oct, Nov
018Solids, total suspendedMX WK AV <= 882 lb/d Jan, Feb, Mar, Apr, Dec
018Solids, total suspendedMX WK AV <= 529 lb/d May, Jun, Jul, Aug, Sep, Oct, Nov
018Nitrogen, total [as N]MO AVG report only all year
018Nitrogen, total [as N]MO AVG report only all year
018Nitrogen, ammonia total [as N]MO AVG <= .9 mg/L May, Jun, Jul, Aug, Sep, Oct, Nov
018Nitrogen, ammonia total [as N]MO AVG <= 1.6 mg/L Jan, Feb, Mar, Apr, Dec
018Nitrogen, ammonia total [as N]MX WK AV <= 1.4 mg/L May, Jun, Jul, Aug, Sep, Oct, Nov
018Nitrogen, ammonia total [as N]MX WK AV <= 2.4 mg/L Jan, Feb, Mar, Apr, Dec
018Nitrogen, ammonia total [as N]MO AVG <= 17.6 lb/d May, Jun, Jul, Aug, Sep, Oct, Nov
018Nitrogen, ammonia total [as N]MO AVG <= 31.4 lb/d Jan, Feb, Mar, Apr, Dec
018Nitrogen, ammonia total [as N]MX WK AV <= 27.5 lb/d May, Jun, Jul, Aug, Sep, Oct, Nov
018Nitrogen, ammonia total [as N]MX WK AV <= 47.1 lb/d Jan, Feb, Mar, Apr, Dec
018Phosphorus, total [as P]MO AVG <= 1 mg/L all year
018Phosphorus, total [as P]MO AVG report only all year
018Flow, in conduit or thru treatment plantMO AVG report only all year
018Chlorine, total residualMO AVG < .06 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
018Chlorine, total residualDAILY MX < .06 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
018E. coli, colony forming units [CFU]MO GEO <= 125 CFU/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
018E. coli, colony forming units [CFU]DAILY MX <= 235 CFU/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
018E. coli, colony forming units [CFU]DAILY MX report only Apr, May, Jun, Jul, Aug, Sep, Oct
018Number of EventsMO TOTAL report only Apr, May, Jun, Jul, Aug, Sep, Oct
018Number of EventsMO TOTAL report only Apr, May, Jun, Jul, Aug, Sep, Oct
018Toxicity [acute], Ceriodaphnia dubiaMAXIMUM <= 1 tox acute May
018Toxicity [chronic], Ceriodaphnia dubiaMAXIMUM <= 1.2 tox chronic May
018Toxicity [acute], Pimephales promelas [Fathead Minnow]MAXIMUM <= 1 tox acute May
018Toxicity [chronic], Pimephales promelas [Fathead Minnow]MAXIMUM <= 1.2 tox chronic May
018BOD, carbonaceous [5 day, 20 C]MO AVG <= 25 mg/L Jan, Feb, Mar, Apr, Dec
018BOD, carbonaceous [5 day, 20 C]MO AVG <= 15 mg/L May, Jun, Jul, Aug, Sep, Oct, Nov
018BOD, carbonaceous [5 day, 20 C]MX WK AV <= 40 mg/L Jan, Feb, Mar, Apr, Dec
018BOD, carbonaceous [5 day, 20 C]MX WK AV <= 23 mg/L May, Jun, Jul, Aug, Sep, Oct, Nov
018BOD, carbonaceous [5 day, 20 C]MO AVG <= 490 lb/d Jan, Feb, Mar, Apr, Dec
018BOD, carbonaceous [5 day, 20 C]MO AVG <= 294 lb/d May, Jun, Jul, Aug, Sep, Oct, Nov
018BOD, carbonaceous [5 day, 20 C]MX WK AV <= 784 lb/d Jan, Feb, Mar, Apr, Dec
018BOD, carbonaceous [5 day, 20 C]MX WK AV <= 451 lb/d May, Jun, Jul, Aug, Sep, Oct, Nov
018Flow, totalMO TOTAL report only all year
PRTCopper, dry weightVALUE report only Jun, Dec
PRTCopper, dry weightVALUE report only Jun, Dec
PRTCadmium, dry weightVALUE report only Jun, Dec
PRTCadmium, dry weightVALUE report only Jun, Dec
PRTMolybdenum, sludge, total, dry weight [as Mo]VALUE report only Jun, Dec
PRTMolybdenum, sludge, total, dry weight [as Mo]VALUE report only Jun, Dec
PRTZinc, sludge, total, dry weight [as Zn]VALUE report only Jun, Dec
PRTZinc, sludge, total, dry weight [as Zn]VALUE report only Jun, Dec
PRTLead, sludge, total, dry weight [as Pb]VALUE report only Jun, Dec
PRTLead, sludge, total, dry weight [as Pb]VALUE report only Jun, Dec
PRTNickel, sludge, total, dry weight [as Ni]VALUE report only Jun, Dec
PRTNickel, sludge, total, dry weight [as Ni]VALUE report only Jun, Dec
PRTMercury, sludge, total, dry weight [as Hg]VALUE report only Jun, Dec
PRTMercury, sludge, total, dry weight [as Hg]VALUE report only Jun, Dec

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