THORN CREEK BASIN SD

NPDES permit IL0027723 · Major POTW · administratively continued, expires 2025-09-30 · EPA's file as of 2026-09-19

Check this month's numbers before you file

This permit expired on 2025-09-30 and is administratively continued: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

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

0values over a limit
0required values missing, on 0 form(s)
0of 55 forms filed late

Last period with anything received: 2026-07-31.

Reporting

Reports are due about 25 days after each monitoring period ends (the most common figure among IL permits in EPA's filings — check your permit).

Limits in force (103)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]MO AV MN report only all year
001Oxygen, dissolved [DO]MN WK AV report only all year
001Oxygen, dissolved [DO]DAILY MN report only all year
001pHMINIMUM >= 6 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspendedMO AVG <= 12 mg/L all year
001Solids, total suspendedDAILY MX <= 24 mg/L all year
001Solids, total suspendedMO AVG <= 4028 lb/d all year
001Solids, total suspendedDAILY MX <= 8056 lb/d all year
001Nitrogen, total [as N]DAILY MX report only all year
001Nitrogen, ammonia total [as N]MO AVG <= 1.8 mg/L May
001Nitrogen, ammonia total [as N]MO AVG <= 2.7 mg/L Mar
001Nitrogen, ammonia total [as N]MO AVG <= 4 mg/L Feb
001Nitrogen, ammonia total [as N]MO AVG <= 1.7 mg/L Jul
001Nitrogen, ammonia total [as N]MO AVG <= 1.8 mg/L Sep
001Nitrogen, ammonia total [as N]MO AVG <= 1.7 mg/L Jun
001Nitrogen, ammonia total [as N]MO AVG <= 1.7 mg/L Aug
001Nitrogen, ammonia total [as N]MO AVG <= 1.8 mg/L Apr
001Nitrogen, ammonia total [as N]MO AVG <= 4 mg/L Dec
001Nitrogen, ammonia total [as N]MO AVG <= 4 mg/L Jan
001Nitrogen, ammonia total [as N]MO AVG <= 4 mg/L Nov
001Nitrogen, ammonia total [as N]MO AVG <= 1.8 mg/L Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 8 mg/L May
001Nitrogen, ammonia total [as N]DAILY MX <= 8 mg/L Mar
001Nitrogen, ammonia total [as N]DAILY MX <= 8 mg/L Feb
001Nitrogen, ammonia total [as N]DAILY MX <= 8 mg/L Jul
001Nitrogen, ammonia total [as N]DAILY MX <= 8 mg/L Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 8 mg/L Jun
001Nitrogen, ammonia total [as N]DAILY MX <= 8 mg/L Aug
001Nitrogen, ammonia total [as N]DAILY MX <= 8 mg/L Apr
001Nitrogen, ammonia total [as N]DAILY MX <= 8 mg/L Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 8 mg/L Jan
001Nitrogen, ammonia total [as N]DAILY MX <= 8 mg/L Nov
001Nitrogen, ammonia total [as N]DAILY MX <= 8 mg/L Oct
001Nitrogen, ammonia total [as N]MO AVG <= 604 lb/d May
001Nitrogen, ammonia total [as N]MO AVG <= 906 lb/d Mar
001Nitrogen, ammonia total [as N]MO AVG <= 1343 lb/d Feb
001Nitrogen, ammonia total [as N]MO AVG <= 571 lb/d Jul
001Nitrogen, ammonia total [as N]MO AVG <= 604 lb/d Sep
001Nitrogen, ammonia total [as N]MO AVG <= 571 lb/d Jun
001Nitrogen, ammonia total [as N]MO AVG <= 571 lb/d Aug
001Nitrogen, ammonia total [as N]MO AVG <= 604 lb/d Apr
001Nitrogen, ammonia total [as N]MO AVG <= 1343 lb/d Dec
001Nitrogen, ammonia total [as N]MO AVG <= 1343 lb/d Jan
001Nitrogen, ammonia total [as N]MO AVG <= 1343 lb/d Nov
001Nitrogen, ammonia total [as N]MO AVG <= 604 lb/d Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 2685 lb/d May
001Nitrogen, ammonia total [as N]DAILY MX <= 2685 lb/d Mar
001Nitrogen, ammonia total [as N]DAILY MX <= 2685 lb/d Feb
001Nitrogen, ammonia total [as N]DAILY MX <= 2685 lb/d Jul
001Nitrogen, ammonia total [as N]DAILY MX <= 2685 lb/d Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 2685 lb/d Jun
001Nitrogen, ammonia total [as N]DAILY MX <= 2685 lb/d Aug
001Nitrogen, ammonia total [as N]DAILY MX <= 2685 lb/d Apr
001Nitrogen, ammonia total [as N]DAILY MX <= 2685 lb/d Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 2685 lb/d Jan
001Nitrogen, ammonia total [as N]DAILY MX <= 2685 lb/d Nov
001Nitrogen, ammonia total [as N]DAILY MX <= 2685 lb/d Oct
001Nitrogen, ammonia total [as N]WKLY AVG <= 6.8 mg/L Mar
001Nitrogen, ammonia total [as N]WKLY AVG <= 7.3 mg/L Apr, May, Sep, Oct
001Nitrogen, ammonia total [as N]WKLY AVG <= 4.3 mg/L Jun, Jul, Aug
001Nitrogen, ammonia total [as N]WKLY AVG <= 2283 lb/d Mar
001Nitrogen, ammonia total [as N]WKLY AVG <= 2451 lb/d Apr, May, Sep, Oct
001Nitrogen, ammonia total [as N]WKLY AVG <= 1443 lb/d Jun, Jul, Aug
001Phosphorus, total [as P]DAILY MX report only all year
001Coliform, fecal - % samples exceeding limitMAXIMUM <= 10 % May, Jun, Jul, Aug, Sep, Oct
001ChlorideDAILY MX <= 500 mg/L all year
001ChlorideDAILY MX <= 167843 lb/d 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 residualDAILY MX <= .038 mg/L May, Jun, Jul, Aug, Sep, Oct
001Chlorine, total residualDAILY MX <= .038 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001Coliform, fecal generalGEO MEAN <= 200 #/100mL May, Jun, Jul, Aug, Sep, Oct
001Coliform, fecal generalDAILY MX report only May, Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 10 mg/L all year
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 20 mg/L all year
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 3357 lb/d all year
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 6714 lb/d all year
001SulfateDAILY MX <= 2116 mg/L Jan, Feb, Mar, Nov, Dec
001SulfateDAILY MX <= 2116 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
001SulfateDAILY MX <= 621689 lb/d Jan, Feb, Mar, Nov, Dec
001SulfateDAILY MX <= 624374 lb/d Apr, May, Jun, Jul, Aug, Sep, Oct
002BOD, 5-day, 20 deg. CDAILY MX report only all year
002Solids, total suspendedDAILY MX report only all year
002Coliform, fecal generalDAILY MX report only all year
002FlowMO TOTAL report only all year
003BOD, 5-day, 20 deg. CDAILY MX report only all year
003Solids, total suspendedDAILY MX report only all year
003Coliform, fecal generalDAILY MX report only all year
003FlowMO TOTAL report only all year
A01BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L all year
A01pHMINIMUM >= 6 SU all year
A01pHMAXIMUM <= 9 SU all year
A01Solids, total suspendedMO AVG <= 30 mg/L all year
A01Nitrogen, ammonia total [as N]DAILY MX report only all year
A01Chlorine, total residualMO AVG <= .75 mg/L all year
A01Coliform, fecal generalMO AVG <= 400 #/100mL all year
A01Coliform, fecal generalDAILY MX <= 800 #/100mL all year
A01Flow, totalMO TOTAL report only all year
INFBOD, 5-day, 20 deg. CMO AVG report only all year
INFSolids, total suspendedMO AVG report only all year
INFFlow, in conduit or thru treatment plantMO AVG report only all year
INFFlow, in conduit or thru treatment plantDAILY 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