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West Liberty - Dundas Sanitary District

Sewage treatment plant, Dundas, Illinois. NPDES permit IL0077879, in force until Sep 30, 2028. Last 12 months: over a limit 11 times (last June 2026), 2 of 24 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: outfall 001 form 0 monthly (23 values), outfall INF form L monthly (4 values)
Renewal application due
Apr 3, 2028 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
5 values over a limit, 0 required values missing, 0 of 24 reports late

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

Period endingParameterReportedLimitOver by
October 2025Nitrogen, ammonia total [as N], daily maximum16.7 mg/L≤ 14.2 mg/L18%
October 2025Solids, total suspended, daily maximum69 mg/L≤ 24 mg/L188%
November 2025Nitrogen, ammonia total [as N], daily maximum12.1 mg/L≤ 8.6 mg/L41%
November 2025Solids, total suspended, daily maximum34 mg/L≤ 24 mg/L42%
March 2026Oxygen, dissolved [DO], daily minimum3.8 mg/L≥ 5 mg/L24%
March 2026Oxygen, dissolved [DO], minimum weekly average3.8 mg/L≥ 6 mg/L37%
April 2026Oxygen, dissolved [DO], daily minimum4.6 mg/L≥ 5 mg/L8%
April 2026Oxygen, dissolved [DO], minimum weekly average4.6 mg/L≥ 6 mg/L23%
June 2026Nitrogen, ammonia total [as N], daily maximum16.2 mg/L≤ 15 mg/L8%
June 2026Oxygen, dissolved [DO], daily minimum3.16 mg/L≥ 5 mg/L37%
June 2026Oxygen, dissolved [DO], minimum weekly average3.16 mg/L≥ 6 mg/L47%

Limits in force (39)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]monthly average minimum≥ 5.5 mg/LJan, Feb, Aug, Sep, Oct, Nov, Dec001
Oxygen, dissolved [DO]minimum weekly average≥ 6 mg/LMar–Jul001
Oxygen, dissolved [DO]minimum weekly average≥ 4 mg/LJan, Feb, Aug, Sep, Oct, Nov, Dec001
Oxygen, dissolved [DO]daily minimum≥ 5 mg/LMar–Jul001
Oxygen, dissolved [DO]daily minimum≥ 3.5 mg/LJan, Feb, Aug, Sep, Oct, Nov, Dec001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 12 mg/Lall year001
Solids, total suspendeddaily maximum≤ 24 mg/Lall year001
Solids, total suspendedmonthly average≤ 5.6 lb/dall year001
Solids, total suspendeddaily maximum≤ 11 lb/dall year001
Nitrogen, ammonia total [as N]monthly average≤ 2.6 mg/LMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]monthly average≤ 2.2 mg/LJun–Aug001
Nitrogen, ammonia total [as N]monthly average≤ 4 mg/LJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 14.2 mg/LMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 15 mg/LJun–Aug001
Nitrogen, ammonia total [as N]daily maximum≤ 8.6 mg/LJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 1.2 lb/dMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]monthly average≤ 1 lb/dJun–Aug001
Nitrogen, ammonia total [as N]monthly average≤ 1.9 lb/dJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 6.6 lb/dMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 7 lb/dJun–Aug001
Nitrogen, ammonia total [as N]daily maximum≤ 4 lb/dJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]weekly average≤ 5.5 mg/LJun–Aug001
Nitrogen, ammonia total [as N]weekly average≤ 6.5 mg/LMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]weekly average≤ 2.6 lb/dJun–Aug001
Nitrogen, ammonia total [as N]weekly average≤ 3 lb/dMar, Apr, May, Sep, Oct001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Chlorine, total residualdaily maximum≤ .05 mg/Lall year001
Coliform, fecal generaldaily maximumreport only (#/100mL)May–Oct001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 20 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 4.7 lb/dall year001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 9.3 lb/dall year001
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.

Check this month's numbers Email me before each report is due

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Your permit document is the final word. As JSON: /api/v1/permits/IL0077879 · MCP: https://passage-data.com/mcp