City of Clarksville

NPDES permit TN0020656 · Major POTW · effective, expires 2030-01-31 · 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

18values over a limit
0required values missing, on 0 form(s)
0of 60 forms filed late

Last period with anything received: 2026-08-31. Most often over: SSO, Dry Weather (8), SSO, Wet Weather (5), E. coli (4).

Reporting

Reports are due about 15 days after each monitoring period ends (the most common figure among TN permits in EPA's filings — check your permit).

Limits in force (78)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]INST MIN >= 1 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 <= 6255 lb/d all year
001Solids, total suspendedDAILY MX <= 9383 lb/d all year
001Solids, total suspendedWKLY AVG <= 8340 lb/d all year
001Solids, settleableDAILY MX <= 1 mL/L all year
001Nitrogen, total [as N]MO AVG report only all year
001Nitrogen, total [as N]DAILY MX report only all year
001Nitrogen, ammonia total [as N]MO AVG report only all year
001Nitrogen, ammonia total [as N]DAILY MX report only all year
001Phosphorus, total [as P]MO AVG report only all year
001Phosphorus, total [as P]DAILY MX report only all year
001Cyanide, total [as CN]MO AVG <= .04 mg/L 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 <= .93 mg/L all year
001Chlorine, total residualDAILY MX <= 1.2 mg/L all year
001E. coliMO GEOMN <= 126 MPN/100mL all year
001E. coliDAILY MX <= 410 MPN/100mL all year
001SSO, Dry WeatherMO TOTAL <= 0 occur/mo all year
001SSO, Wet WeatherMO TOTAL <= 0 occur/mo all year
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 25 mg/L all year
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 35 mg/L all year
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 40 mg/L all year
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 5213 lb/d all year
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 8340 lb/d all year
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 7298 lb/d all year
001BOD, carbonaceous, percent removalMO AV MN >= 85 % all year
001Solids, suspended percent removalMO AV MN >= 85 % all year
001IC25 Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaMINIMUM >= 3 % all year
001IC25 Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasMINIMUM >= 3 % all year
002Oxygen, dissolved [DO]MINIMUM report only all year
002BOD, 5-day, 20 deg. CMO AVG report only all year
002BOD, 5-day, 20 deg. CDAILY MX report only all year
002BOD, 5-day, 20 deg. CMO AVG report only all year
002pHMINIMUM >= 6 SU all year
002pHMAXIMUM <= 9 SU all year
002Solids, total suspendedMO AVG report only all year
002Solids, total suspendedDAILY MX report only all year
002Solids, total suspendedMO AVG report only all year
002Solids, settleableDAILY MX report only all year
002Flow, in conduit or thru treatment plantMO AVG report only all year
002Flow, in conduit or thru treatment plantDAILY MX report only all year
002E. coliDAILY MX report only all year
002Discharge event observation [Visual Monitoring]TOTAL <= 6 occur/yr all year
002Discharge event observation [Visual Monitoring]ANNL AVG <= 4 occur/yr all year
002Discharge event observation [Visual Monitoring]MO TOTAL report only all year
004Flow, in conduit or thru treatment plantMO AVG report only all year
004Flow, in conduit or thru treatment plantDAILY MX report only all year
004Discharge event observation [Visual Monitoring]TOTAL <= 6 occur/yr all year
004Discharge event observation [Visual Monitoring]ANNL AVG <= 4 occur/yr all year
004Discharge event observation [Visual Monitoring]MO TOTAL report only all year
006Oxygen, dissolved [DO]MINIMUM report only all year
006BOD, 5-day, 20 deg. CMO AVG report only all year
006BOD, 5-day, 20 deg. CDAILY MX report only all year
006BOD, 5-day, 20 deg. CMO AVG report only all year
006pHMINIMUM >= 6 SU all year
006pHMAXIMUM <= 9 SU all year
006Solids, total suspendedMO AVG report only all year
006Solids, total suspendedDAILY MX report only all year
006Solids, total suspendedMO AVG report only all year
006Solids, settleableDAILY MX report only all year
006Flow, in conduit or thru treatment plantMO AVG report only all year
006Flow, in conduit or thru treatment plantDAILY MX report only all year
006E. coliMO AVG report only all year
006Discharge event observation [Visual Monitoring]TOTAL <= 6 occur/yr all year
006Discharge event observation [Visual Monitoring]ANNL AVG <= 4 occur/yr all year
006Discharge event observation [Visual Monitoring]MO TOTAL report only 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

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