City of Oak Ridge

NPDES permit TN0024155 · Major POTW · effective, expires 2028-12-31 · 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.

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

7values over a limit
0required values missing, on 0 form(s)
2of 60 forms filed late

Last period with anything received: 2026-08-31. Most often over: SSO, Wet Weather (2), BOD, carbonaceous [5 day, 20 C] (1), BOD, carbonaceous, percent removal (1).

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 (74)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]INST MIN >= 6 mg/L all year
001pHMINIMUM >= 6 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, settleableDAILY MX <= 1 mL/L all year
001Nitrogen, total [as N]MO AVG report only all year
001Nitrogen, total [as N]ANNL AVG <= 258420 lb/yr all year
001Nitrogen, ammonia total [as N]MO AVG <= .59 mg/L May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MO AVG <= 1.12 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 2.58 mg/L May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 4.96 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001Phosphorus, total [as P]MO AVG report only all year
001Phosphorus, total [as P]ANNL AVG <= 39420 lb/yr 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
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
001IC25 Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaMINIMUM >= 95.4 % all year
001IC25 Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasMINIMUM >= 95.4 % all year
01ASolids, total suspendedMO AVG <= 30 mg/L all year
01ASolids, total suspendedWKLY AVG <= 40 mg/L all year
01ASolids, total suspendedDAILY MX <= 45 mg/L all year
01ASolids, total suspendedMO AVG <= 2502 lb/d all year
01ASolids, total suspendedWKLY AVG <= 3336 lb/d all year
01AFlow, in conduit or thru treatment plantMO AVG report only all year
01AFlow, in conduit or thru treatment plantDAILY MX report only all year
01ABOD, carbonaceous [5 day, 20 C]MO AVG <= 7 mg/L May, Jun, Jul, Aug, Sep, Oct
01ABOD, carbonaceous [5 day, 20 C]MO AVG <= 13 mg/L Jan, Feb, Mar, Apr, Nov, Dec
01ABOD, carbonaceous [5 day, 20 C]WKLY AVG <= 12 mg/L May, Jun, Jul, Aug, Sep, Oct
01ABOD, carbonaceous [5 day, 20 C]WKLY AVG <= 20 mg/L Jan, Feb, Mar, Apr, Nov, Dec
01ABOD, carbonaceous [5 day, 20 C]DAILY MX <= 14 mg/L May, Jun, Jul, Aug, Sep, Oct
01ABOD, carbonaceous [5 day, 20 C]DAILY MX <= 26 mg/L Jan, Feb, Mar, Apr, Nov, Dec
01ABOD, carbonaceous [5 day, 20 C]MO AVG <= 584 lb/d May, Jun, Jul, Aug, Sep, Oct
01ABOD, carbonaceous [5 day, 20 C]MO AVG <= 1084 lb/d Jan, Feb, Mar, Apr, Nov, Dec
01ABOD, carbonaceous [5 day, 20 C]DAILY MX <= 1167 lb/d May, Jun, Jul, Aug, Sep, Oct
01ABOD, carbonaceous [5 day, 20 C]DAILY MX <= 2168 lb/d Jan, Feb, Mar, Apr, Nov, Dec
01ABOD, carbonaceous [5 day, 20 C]WKLY AVG <= 1000 lb/d May, Jun, Jul, Aug, Sep, Oct
01ABOD, carbonaceous [5 day, 20 C]WKLY AVG <= 1668 lb/d Jan, Feb, Mar, Apr, Nov, Dec
01ABOD, carbonaceous, percent removalDAILY MN >= 40 % all year
01ABOD, carbonaceous, percent removalMO AV MN >= 85 % all year
01ASolids, suspended percent removalDAILY MN >= 40 % all year
01ASolids, suspended percent removalMO AV MN >= 85 % all year
01BSolids, total suspendedMO AVG <= 30 mg/L all year
01BSolids, total suspendedWKLY AVG <= 40 mg/L all year
01BSolids, total suspendedDAILY MX <= 45 mg/L all year
01BSolids, total suspendedMO AVG <= 5004 lb/d all year
01BSolids, total suspendedDAILY MX <= 7506 lb/d all year
01BFlow, in conduit or thru treatment plantMO AVG report only all year
01BFlow, in conduit or thru treatment plantDAILY MX report only all year
01BBOD, carbonaceous [5 day, 20 C]MO AVG <= 15 mg/L Jan, Feb, Mar, Apr, Nov, Dec
01BBOD, carbonaceous [5 day, 20 C]MO AVG <= 8 mg/L May, Jun, Jul, Aug, Sep, Oct
01BBOD, carbonaceous [5 day, 20 C]DAILY MX <= 25 mg/L Jan, Feb, Mar, Apr, Nov, Dec
01BBOD, carbonaceous [5 day, 20 C]DAILY MX <= 16 mg/L May, Jun, Jul, Aug, Sep, Oct
01BBOD, carbonaceous [5 day, 20 C]MO AVG <= 2502 lb/d Jan, Feb, Mar, Apr, Nov, Dec
01BBOD, carbonaceous [5 day, 20 C]MO AVG <= 1334 lb/d May, Jun, Jul, Aug, Sep, Oct
01BBOD, carbonaceous [5 day, 20 C]DAILY MX <= 4170 lb/d Jan, Feb, Mar, Apr, Nov, Dec
01BBOD, carbonaceous [5 day, 20 C]DAILY MX <= 2668 lb/d May, Jun, Jul, Aug, Sep, Oct
01BBOD, carbonaceous, percent removalDAILY MN >= 40 % all year
01BBOD, carbonaceous, percent removalMO AV MN >= 85 % all year
01BSolids, suspended percent removalDAILY MN >= 40 % all year
01BSolids, suspended percent removalMO AV MN >= 85 % all year
INFASolids, total suspendedMO AVG report only all year
INFASolids, total suspendedDAILY MX report only all year
INFAFlow, in conduit or thru treatment plantMO AVG report only all year
INFAFlow, in conduit or thru treatment plantDAILY MX report only all year
INFABOD, carbonaceous [5 day, 20 C]MO AVG report only all year
INFABOD, carbonaceous [5 day, 20 C]DAILY MX report only all year
INFBSolids, total suspendedMO AVG report only all year
INFBSolids, total suspendedDAILY MX report only all year
INFBFlow, in conduit or thru treatment plantMO AVG report only all year
INFBFlow, in conduit or thru treatment plantDAILY MX report only all year
INFBBOD, carbonaceous [5 day, 20 C]MO AVG report only all year
INFBBOD, carbonaceous [5 day, 20 C]DAILY MX 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