City of Cowan

NPDES permit TN0021644 · Minor POTW · effective, expires 2027-01-31 · 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

0values over a limit
0required values missing, on 0 form(s)
0of 24 forms filed late

Last period with anything received: 2026-08-31.

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 (41)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]INST MIN >= 6 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 <= 100 lb/d all year
001Solids, total suspendedWKLY AVG <= 133 lb/d all year
001Solids, settleableDAILY MX <= 1 mL/L all year
001Nitrogen, ammonia total [as N]MO AVG <= 2 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, ammonia total [as N]MO AVG <= 1.4 mg/L May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]WKLY AVG <= 3 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, ammonia total [as N]WKLY AVG <= 2 mg/L May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 4 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 3 mg/L May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MO AVG <= 6.7 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, ammonia total [as N]MO AVG <= 5 lb/d May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]WKLY AVG <= 10 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, ammonia total [as N]WKLY AVG <= 6.7 lb/d May, Jun, Jul, Aug, Sep, Oct
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 residualDAILY MX <= .04 mg/L all year
001E. coliMX <= 126 #/100mL all year
001E. coliDAILY MX <= 941 #/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 <= 10 mg/L all year
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 15 mg/L all year
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 25 mg/L all year
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 33.4 lb/d all year
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 50 lb/d all year
001BOD, carbonaceous, percent removalDAILY MN >= 40 % all year
001BOD, carbonaceous, percent removalMO AV MN >= 85 % all year
001Solids, suspended percent removalDAILY MN >= 40 % all year
001Solids, suspended percent removalMO AV MN >= 85 % 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