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City of Portland

Sewage treatment plant, major discharger, Portland, Tennessee. NPDES permit TN0021865, in force until Aug 31, 2029. Last 12 months: over a limit 26 times (last September 2026), 5 required values missing, 7 of 24 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form G monthly (44 values), outfall INF1 form G monthly (6 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
40 values over a limit, 15 required values missing, 9 of 24 reports late

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

All 26 values over a limit
Period endingParameterReportedLimitOver by
November 2025SSO, Dry Weather, monthly total1 occur/mo≤ 0 occur/mo—
November 2025SSO, Wet Weather, monthly total2 occur/mo≤ 0 occur/mo—
December 2025SSO, Dry Weather, monthly total1 occur/mo≤ 0 occur/mo—
December 2025SSO, Wet Weather, monthly total11 occur/mo≤ 0 occur/mo—
January 2026Nitrogen, ammonia total [as N], daily maximum3.45 mg/L≤ 3 mg/L15%
January 2026SSO, Wet Weather, monthly total6 occur/mo≤ 0 occur/mo—
February 2026Nitrogen, ammonia total [as N], daily maximum4.92 mg/L≤ 3 mg/L64%
February 2026Nitrogen, ammonia total [as N], monthly average2.58 mg/L≤ 1.5 mg/L72%
February 2026Nitrogen, ammonia total [as N], monthly average37.91 lb/d≤ 35 lb/d8%
February 2026Nitrogen, ammonia total [as N], weekly average2.58 mg/L≤ 2.2 mg/L17%
February 2026SSO, Dry Weather, monthly total6 occur/mo≤ 0 occur/mo—
February 2026SSO, Wet Weather, monthly total6 occur/mo≤ 0 occur/mo—
March 2026Nitrogen, total [as N], daily maximum36.1 mg/L≤ 14.6 mg/L147%
March 2026Nitrogen, total [as N], monthly average226.67 lb/d≤ 115.7 lb/d96%
March 2026Nitrogen, total [as N], monthly average23.5 mg/L≤ 7.3 mg/L222%
March 2026SSO, Dry Weather, monthly total3 occur/mo≤ 0 occur/mo—
March 2026SSO, Wet Weather, monthly total2 occur/mo≤ 0 occur/mo—
April 2026SSO, Dry Weather, monthly total1 occur/mo≤ 0 occur/mo—
May 2026SSO, Dry Weather, monthly total3 occur/mo≤ 0 occur/mo—
May 2026SSO, Wet Weather, monthly total4 occur/mo≤ 0 occur/mo—
June 2026SSO, Dry Weather, monthly total1 occur/mo≤ 0 occur/mo—
June 2026SSO, Wet Weather, monthly total6 occur/mo≤ 0 occur/mo—
July 2026SSO, Dry Weather, monthly total2 occur/mo≤ 0 occur/mo—
July 2026SSO, Wet Weather, monthly total10 occur/mo≤ 0 occur/mo—
August 2026SSO, Dry Weather, monthly total1 occur/mo≤ 0 occur/mo—
September 2026SSO, Dry Weather, monthly total1 occur/mo≤ 0 occur/mo—

Limits in force (60)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]instantaneous minimum≥ 6 mg/Lall year001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendedweekly average≤ 40 mg/Lall year001
Solids, total suspendeddaily maximum≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 475 lb/dall year001
Solids, total suspendedweekly average≤ 634 lb/dall year001
Solids, settleabledaily maximum≤ 1 mL/Lall year001
Nitrogen, total [as N]monthly average≤ 7.3 mg/Lall year001
Nitrogen, total [as N]weekly average≤ 10.95 mg/Lall year001
Nitrogen, total [as N]daily maximum≤ 14.6 mg/Lall year001
Nitrogen, total [as N]monthly average≤ 115.7 lb/dall year001
Nitrogen, total [as N]weekly average≤ 173.5 lb/dall year001
Nitrogen, ammonia total [as N]monthly average≤ .7 mg/LMay–Oct001
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]weekly average≤ 1 mg/LMay–Oct001
Nitrogen, ammonia total [as N]weekly average≤ 2.2 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 1.4 mg/LMay–Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 3 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 17 lb/dMay–Oct001
Nitrogen, ammonia total [as N]monthly average≤ 35 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]weekly average≤ 25 lb/dMay–Oct001
Nitrogen, ammonia total [as N]weekly average≤ 52 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Phosphorus, total [as P]monthly average≤ 4.5 mg/Lall year001
Phosphorus, total [as P]weekly average≤ 6.75 mg/Lall year001
Phosphorus, total [as P]daily maximum≤ 9 mg/Lall year001
Phosphorus, total [as P]monthly average≤ 71.3 lb/dall year001
Phosphorus, total [as P]weekly average≤ 107 lb/dall year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Chlorine, total residualmonthly average≤ .011 mg/Lall year001
Chlorine, total residualdaily maximum≤ .02 mg/Lall year001
E. colimonthly geometric mean≤ 126 #/100mLall year001
E. colidaily maximum≤ 410 #/100mLall year001
SSO, Dry Weathermonthly total≤ 0 occur/moall year001
SSO, Wet Weathermonthly total≤ 0 occur/moall year001
Mercury, total [as Hg]monthly average≤ .00005 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 15.7 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10.5 mg/LMay–Oct001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 18.4 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 14.2 mg/LMay–Oct001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 25 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 20 mg/LMay–Oct001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 250 lb/dJan, Feb, Mar, Apr, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 167 lb/dMay–Oct001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 292 lb/dJan, Feb, Mar, Apr, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 225 lb/dMay–Oct001
BOD, carbonaceous, percent removaldaily minimum≥ 40 %all year001
BOD, carbonaceous, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removaldaily minimum≥ 40 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
IC25 Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaminimum> 97 %all year001
IC25 Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasminimum> 97 %all year001
Solids, total suspendedmonthly averagereport only (mg/L)all yearINF1
Solids, total suspendeddaily maximumreport only (mg/L)all yearINF1
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearINF1
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearINF1
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all yearINF1
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (mg/L)all yearINF1

How strict are these limits?

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

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