ILLINOIS AMERICAN WATER COMPANY

NPDES permit IL0059005 · Minor POTW · effective, expires 2030-05-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file

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

3values over a limit
0required values missing, on 0 form(s)
0of 33 forms filed late

Last period with anything received: 2026-07-31. Most often over: Coliform, fecal general (2), Nitrogen, ammonia total [as N] (1).

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 (62)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]MO AV MN >= 5.5 mg/L Jan, Feb, Aug, Sep, Oct, Nov, Dec
001Oxygen, dissolved [DO]MN WK AV >= 4 mg/L Jan, Feb, Aug, Sep, Oct, Nov, Dec
001Oxygen, dissolved [DO]MN WK AV >= 6 mg/L Mar, Apr, May, Jun, Jul
001Oxygen, dissolved [DO]DAILY MN >= 3.5 mg/L Jan, Feb, Aug, Sep, Oct, Nov, Dec
001Oxygen, dissolved [DO]DAILY MN >= 5 mg/L Mar, Apr, May, Jun, Jul
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 <= 120 lb/d all year
001Solids, total suspendedDAILY MX <= 240 lb/d all year
001Nitrogen, ammonia total [as N]MO AVG <= 1.4 mg/L Apr, May, Sep, Oct
001Nitrogen, ammonia total [as N]MO AVG <= 1.7 mg/L Mar
001Nitrogen, ammonia total [as N]MO AVG <= 1.4 mg/L Jun, Jul, Aug
001Nitrogen, ammonia total [as N]MO AVG <= 1.7 mg/L Jan, Feb, Nov, Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 4.7 mg/L Apr, May, Sep, Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 7.1 mg/L Mar
001Nitrogen, ammonia total [as N]DAILY MX <= 4.7 mg/L Jun, Jul, Aug
001Nitrogen, ammonia total [as N]DAILY MX <= 6.8 mg/L Jan, Feb, Nov, Dec
001Nitrogen, ammonia total [as N]MO AVG <= 14 lb/d Apr, May, Sep, Oct
001Nitrogen, ammonia total [as N]MO AVG <= 17 lb/d Mar
001Nitrogen, ammonia total [as N]MO AVG <= 14 lb/d Jun, Jul, Aug
001Nitrogen, ammonia total [as N]MO AVG <= 17 lb/d Jan, Feb, Nov, Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 47 lb/d Apr, May, Sep, Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 71 lb/d Mar
001Nitrogen, ammonia total [as N]DAILY MX <= 47 lb/d Jun, Jul, Aug
001Nitrogen, ammonia total [as N]DAILY MX <= 68 lb/d Jan, Feb, Nov, Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 3.8 mg/L Jun, Jul, Aug
001Nitrogen, ammonia total [as N]DAILY MX <= 4.3 mg/L Mar
001Nitrogen, ammonia total [as N]DAILY MX <= 4.3 mg/L Apr, May, Sep, Oct
001Nitrogen, ammonia total [as N]WKLY AVG <= 38 lb/d Jun, Jul, Aug
001Nitrogen, ammonia total [as N]WKLY AVG <= 43 lb/d Mar
001Nitrogen, ammonia total [as N]WKLY AVG <= 43 lb/d Apr, May, Sep, Oct
001Phosphorus, total [as P]MO AVG <= 1 mg/L all year
001Phosphorus, total [as P]DAILY MX <= 2 mg/L all year
001Phosphorus, total [as P]MO AVG <= 10 lb/d all year
001Phosphorus, total [as P]DAILY MX <= 20 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 <= .05 mg/L all year
001Coliform, fecal generalDAILY MX report only all year
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 <= 100 lb/d all year
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 200 lb/d all year
003BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L all year
003BOD, 5-day, 20 deg. CWKLY AVG <= 45 mg/L all year
003pHMINIMUM >= 6 SU all year
003pHMAXIMUM <= 9 SU all year
003Solids, total suspendedMO AVG <= 30 mg/L all year
003Solids, total suspendedWKLY AVG <= 45 mg/L all year
003Nitrogen, ammonia total [as N]MO AVG report only all year
003Nitrogen, ammonia total [as N]DAILY MX report only all year
003Phosphorus, total [as P]MO AVG report only all year
003Phosphorus, total [as P]DAILY MX report only all year
003Chlorine, total residualMO AVG <= .75 mg/L all year
003Coliform, fecal generalDAILY MX <= 400 #/100mL all year
003Flow, 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