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Dallas City, City of

Sewage treatment plant, Dallas City, Illinois. NPDES permit IL0028312, in force until Mar 31, 2028. Last 12 months: over a limit 18 times (last August 2026), 4 of 44 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: outfall 001 form 0 monthly (18 values), outfall INF form L monthly (4 values)
Renewal application due
Oct 3, 2027 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
7 values over a limit, 0 required values missing, 0 of 48 reports late

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

All 18 values over a limit
Period endingParameterReportedLimitOver by
March 2026Oxygen, dissolved [DO], minimum weekly average5.4 mg/L≥ 6 mg/L10%
April 2026Oxygen, dissolved [DO], daily minimum4.83 mg/L≥ 5 mg/L3%
April 2026Oxygen, dissolved [DO], minimum weekly average4.83 mg/L≥ 6 mg/L20%
April 2026Solids, total suspended, monthly average87 mg/L≤ 37 mg/L135%
April 2026Solids, total suspended, weekly average87 mg/L≤ 45 mg/L93%
May 2026Oxygen, dissolved [DO], daily minimum1.93 mg/L≥ 5 mg/L61%
May 2026Oxygen, dissolved [DO], minimum weekly average1.93 mg/L≥ 6 mg/L68%
May 2026Solids, total suspended, monthly average41 mg/L≤ 37 mg/L11%
May 2026Solids, total suspended, weekly average60 mg/L≤ 45 mg/L33%
June 2026Oxygen, dissolved [DO], daily minimum2.51 mg/L≥ 5 mg/L50%
June 2026Oxygen, dissolved [DO], minimum weekly average2.51 mg/L≥ 6 mg/L58%
June 2026Solids, total suspended, monthly average53.5 mg/L≤ 37 mg/L45%
June 2026Solids, total suspended, weekly average92 mg/L≤ 45 mg/L104%
July 2026Oxygen, dissolved [DO], daily minimum1.43 mg/L≥ 5 mg/L71%
July 2026Oxygen, dissolved [DO], minimum weekly average1.43 mg/L≥ 6 mg/L76%
August 2026Solids, total suspended, monthly average140 mg/L≤ 37 mg/L278%
August 2026Solids, total suspended, weekly average140 mg/L≤ 45 mg/L211%
August 2026pH, maximum9.17 SU≤ 9 SU—

Limits in force (32)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]monthly average minimum≥ 5.5 mg/LJan, Feb, Aug, Sep, Oct, Nov, Dec001
Oxygen, dissolved [DO]minimum weekly average≥ 4 mg/LJan, Feb, Aug, Sep, Oct, Nov, Dec001
Oxygen, dissolved [DO]minimum weekly average≥ 6 mg/LMar–Jul001
Oxygen, dissolved [DO]daily minimum≥ 3.5 mg/LJan, Feb, Aug, Sep, Oct, Nov, Dec001
Oxygen, dissolved [DO]daily minimum≥ 5 mg/LMar–Jul001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 37 mg/Lall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 324 lb/dall year001
Solids, total suspendedweekly average≤ 394 lb/dall year001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year001
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≤ 25 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 40 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 219 lb/dall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 350 lb/dall year001
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year003
Solids, total suspendeddaily maximumreport only (mg/L)all year003
Coliform, fecal generaldaily maximumreport only (#/100mL)all year003
Flowmonthly totalreport only (#/mo)all year003
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year004
Solids, total suspendeddaily maximumreport only (mg/L)all year004
Coliform, fecal generaldaily maximumreport only (#/100mL)all year004
Flowmonthly totalreport only (#/mo)all year004
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

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/IL0028312 · MCP: https://passage-data.com/mcp