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City of Oak Ridge

Sewage treatment plant, major discharger, Oak Ridge, Tennessee. NPDES permit TN0024155, in force until Dec 31, 2028. Last 12 months: over a limit 7 times (last June 2026), 1 of 60 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form G monthly (18 values), outfall 01A form G monthly (17 values), outfall 01B form G monthly (15 values), outfall INFA form G monthly (6 values), outfall INFB form G monthly (6 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
5 values over a limit, 5 required values missing, 6 of 60 reports late

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

Period endingOutfallParameterReportedLimitOver by
October 2025001IC25 Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia, minimum> 6.75 %≥ 95.4 %93%
October 202501BBOD, carbonaceous [5 day, 20 C], monthly average10.4 mg/L≤ 8 mg/L30%
January 2026001SSO, Dry Weather, monthly total1 occur/mo≤ 0 occur/mo—
January 2026001SSO, Wet Weather, monthly total2 occur/mo≤ 0 occur/mo—
February 2026001SSO, Wet Weather, monthly total1 occur/mo≤ 0 occur/mo—
March 202601BBOD, carbonaceous, percent removal, monthly average minimum83 %≥ 85 %13%
June 2026001Nitrogen, ammonia total [as N], monthly average1.09 mg/L≤ .59 mg/L85%

Limits in force (74)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]instantaneous minimum≥ 6 mg/Lall year001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Solids, settleabledaily maximum≤ 1 mL/Lall year001
Nitrogen, total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, total [as N]annual average≤ 258420 lb/yrall year001
Nitrogen, ammonia total [as N]monthly average≤ .59 mg/LMay–Oct001
Nitrogen, ammonia total [as N]monthly average≤ 1.12 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 2.58 mg/LMay–Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 4.96 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Phosphorus, total [as P]monthly averagereport only (mg/L)all year001
Phosphorus, total [as P]annual average≤ 39420 lb/yrall 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
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
IC25 Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaminimum≥ 95.4 %all year001
IC25 Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasminimum≥ 95.4 %all year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year01A
Solids, total suspendedweekly average≤ 40 mg/Lall year01A
Solids, total suspendeddaily maximum≤ 45 mg/Lall year01A
Solids, total suspendedmonthly average≤ 2502 lb/dall year01A
Solids, total suspendedweekly average≤ 3336 lb/dall year01A
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year01A
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year01A
BOD, carbonaceous [5 day, 20 C]monthly average≤ 7 mg/LMay–Oct01A
BOD, carbonaceous [5 day, 20 C]monthly average≤ 13 mg/LJan, Feb, Mar, Apr, Nov, Dec01A
BOD, carbonaceous [5 day, 20 C]weekly average≤ 12 mg/LMay–Oct01A
BOD, carbonaceous [5 day, 20 C]weekly average≤ 20 mg/LJan, Feb, Mar, Apr, Nov, Dec01A
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 14 mg/LMay–Oct01A
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 26 mg/LJan, Feb, Mar, Apr, Nov, Dec01A
BOD, carbonaceous [5 day, 20 C]monthly average≤ 584 lb/dMay–Oct01A
BOD, carbonaceous [5 day, 20 C]monthly average≤ 1084 lb/dJan, Feb, Mar, Apr, Nov, Dec01A
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 1167 lb/dMay–Oct01A
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 2168 lb/dJan, Feb, Mar, Apr, Nov, Dec01A
BOD, carbonaceous [5 day, 20 C]weekly average≤ 1000 lb/dMay–Oct01A
BOD, carbonaceous [5 day, 20 C]weekly average≤ 1668 lb/dJan, Feb, Mar, Apr, Nov, Dec01A
BOD, carbonaceous, percent removaldaily minimum≥ 40 %all year01A
BOD, carbonaceous, percent removalmonthly average minimum≥ 85 %all year01A
Solids, suspended percent removaldaily minimum≥ 40 %all year01A
Solids, suspended percent removalmonthly average minimum≥ 85 %all year01A
Solids, total suspendedmonthly average≤ 30 mg/Lall year01B
Solids, total suspendedweekly average≤ 40 mg/Lall year01B
Solids, total suspendeddaily maximum≤ 45 mg/Lall year01B
Solids, total suspendedmonthly average≤ 5004 lb/dall year01B
Solids, total suspendeddaily maximum≤ 7506 lb/dall year01B
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year01B
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year01B
BOD, carbonaceous [5 day, 20 C]monthly average≤ 15 mg/LJan, Feb, Mar, Apr, Nov, Dec01B
BOD, carbonaceous [5 day, 20 C]monthly average≤ 8 mg/LMay–Oct01B
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 25 mg/LJan, Feb, Mar, Apr, Nov, Dec01B
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 16 mg/LMay–Oct01B
BOD, carbonaceous [5 day, 20 C]monthly average≤ 2502 lb/dJan, Feb, Mar, Apr, Nov, Dec01B
BOD, carbonaceous [5 day, 20 C]monthly average≤ 1334 lb/dMay–Oct01B
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 4170 lb/dJan, Feb, Mar, Apr, Nov, Dec01B
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 2668 lb/dMay–Oct01B
BOD, carbonaceous, percent removaldaily minimum≥ 40 %all year01B
BOD, carbonaceous, percent removalmonthly average minimum≥ 85 %all year01B
Solids, suspended percent removaldaily minimum≥ 40 %all year01B
Solids, suspended percent removalmonthly average minimum≥ 85 %all year01B
Solids, total suspendedmonthly averagereport only (mg/L)all yearINFA
Solids, total suspendeddaily maximumreport only (mg/L)all yearINFA
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearINFA
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearINFA
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all yearINFA
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (mg/L)all yearINFA
Solids, total suspendedmonthly averagereport only (mg/L)all yearINFB
Solids, total suspendeddaily maximumreport only (mg/L)all yearINFB
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearINFB
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearINFB
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all yearINFB
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (mg/L)all yearINFB

How strict are these limits?

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

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/TN0024155 · MCP: https://passage-data.com/mcp