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Maroa, City of

Sewage treatment plant, Maroa, Illinois. NPDES permit IL0025208, in force until Apr 30, 2028. Last 12 months: over a limit 18 times (last February 2026), 64 required values missing, 10 of 44 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 26 days after each period: outfall 001 form 0 monthly (14 values), outfall A01 form 0 monthly (4 values), outfall B01 form 0 monthly (19 values), outfall INF form L monthly (4 values)
Renewal application due
Nov 2, 2027 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
4 values over a limit, 13 required values missing, 2 of 48 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

All 18 values over a limit
Period endingOutfallParameterReportedLimitOver by
December 2025001Solids, total suspended, monthly average75 mg/L≤ 30 mg/L150%
December 2025001Solids, total suspended, monthly average75 mg/L≤ 30 mg/L150%
December 2025001Solids, total suspended, weekly average75 mg/L≤ 45 mg/L67%
December 2025001Solids, total suspended, weekly average75 mg/L≤ 45 mg/L67%
December 2025B01Solids, total suspended, monthly average75 mg/L≤ 37 mg/L103%
December 2025B01Solids, total suspended, weekly average75 mg/L≤ 45 mg/L67%
January 2026001Solids, total suspended, monthly average61 mg/L≤ 30 mg/L103%
January 2026001Solids, total suspended, monthly average61 mg/L≤ 30 mg/L103%
January 2026001Solids, total suspended, weekly average61 mg/L≤ 45 mg/L36%
January 2026001Solids, total suspended, weekly average61 mg/L≤ 45 mg/L36%
January 2026B01Solids, total suspended, monthly average61 mg/L≤ 37 mg/L65%
January 2026B01Solids, total suspended, weekly average61 mg/L≤ 45 mg/L36%
February 2026001Solids, total suspended, monthly average59 mg/L≤ 30 mg/L97%
February 2026001Solids, total suspended, monthly average59 mg/L≤ 30 mg/L97%
February 2026001Solids, total suspended, weekly average59 mg/L≤ 45 mg/L31%
February 2026001Solids, total suspended, weekly average59 mg/L≤ 45 mg/L31%
February 2026B01Solids, total suspended, monthly average59 mg/L≤ 37 mg/L59%
February 2026B01Solids, total suspended, weekly average59 mg/L≤ 45 mg/L31%

Limits in force (43)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]monthly average minimumreport only (mg/L)all year001
Oxygen, dissolved [DO]minimum weekly averagereport only (mg/L)all year001
Oxygen, dissolved [DO]daily minimumreport only (mg/L)all year001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year001
Chlorine, total residualmonthly average≤ .75 mg/Lall year001
Coliform, fecal generaldaily maximum≤ 400 #/100mLall year001
Flow, totalmonthly totalreport only (Mgal/mo)all year001
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all yearA01
Solids, total suspendeddaily maximumreport only (mg/L)all yearA01
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all yearA01
Flow, totalmonthly totalreport only (Mgal/mo)all yearA01
Oxygen, dissolved [DO]monthly average minimum≥ 5.5 mg/LJan, Feb, Aug, Sep, Oct, Nov, DecB01
Oxygen, dissolved [DO]minimum weekly average≥ 6 mg/LMar–JulB01
Oxygen, dissolved [DO]minimum weekly average≥ 4 mg/LJan, Feb, Aug, Sep, Oct, Nov, DecB01
Oxygen, dissolved [DO]daily minimum≥ 5 mg/LMar–JulB01
Oxygen, dissolved [DO]daily minimum≥ 3.5 mg/LJan, Feb, Aug, Sep, Oct, Nov, DecB01
pHminimum≥ 6 SUall yearB01
pHmaximum≤ 9 SUall yearB01
Solids, total suspendedmonthly average≤ 37 mg/Lall yearB01
Solids, total suspendedweekly average≤ 45 mg/Lall yearB01
Solids, total suspendedmonthly average≤ 278 lb/dall yearB01
Solids, total suspendedweekly average≤ 338 lb/dall yearB01
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all yearB01
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearB01
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearB01
Chlorine, total residualdaily maximum≤ .05 mg/Lall yearB01
Coliform, fecal generaldaily maximumreport only (#/100mL)May–OctB01
Coliform, fecal generaldaily maximum≤ 400 #/100mLall yearB01
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall yearB01
BOD, carbonaceous [5 day, 20 C]weekly average≤ 40 mg/Lall yearB01
BOD, carbonaceous [5 day, 20 C]monthly average≤ 188 lb/dall yearB01
BOD, carbonaceous [5 day, 20 C]weekly average≤ 300 lb/dall yearB01
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all yearINF
Solids, total suspendedmonthly averagereport only (mg/L)all yearINF
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearINF
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearINF

How strict are these limits?

Cited limits by parameter: Illinois's rules and the federal ones.

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Your permit document is the final word. As JSON: /api/v1/permits/IL0025208 · MCP: https://passage-data.com/mcp