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Alto Pass, Village of

Sewage treatment plant, Alto Pass, Illinois. NPDES permit IL0080128, in force until Dec 31, 2028. Last 12 months: over a limit 12 times (last June 2026), 4 required values missing, 1 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)
Last report on file
September 2026
Oct 2024 – Sep 2025
3 values over a limit, 60 required values missing, 8 of 18 reports late

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

Period endingParameterReportedLimitOver by
October 2025Coliform, fecal general, daily maximum1100 #/100mL≤ 400 #/100mL175%
January 2026Nitrogen, ammonia total [as N], monthly average4.9 mg/L≤ 4 mg/L23%
February 2026BOD, carbonaceous [5 day, 20 C], daily maximum22 mg/L≤ 20 mg/L10%
February 2026BOD, carbonaceous [5 day, 20 C], monthly average22 mg/L≤ 10 mg/L120%
March 2026Nitrogen, ammonia total [as N], daily maximum21.7 mg/L≤ 15 mg/L45%
March 2026Nitrogen, ammonia total [as N], monthly average21.7 mg/L≤ 2.7 mg/L704%
March 2026Nitrogen, ammonia total [as N], weekly average21.7 mg/L≤ 6.7 mg/L224%
April 2026Nitrogen, ammonia total [as N], monthly average7.2 mg/L≤ 2.7 mg/L167%
April 2026Nitrogen, ammonia total [as N], weekly average7.2 mg/L≤ 6.7 mg/L7%
June 2026BOD, carbonaceous [5 day, 20 C], monthly average17 mg/L≤ 10 mg/L70%
June 2026Nitrogen, ammonia total [as N], monthly average4.37 mg/L≤ 2.3 mg/L90%
June 2026Solids, total suspended, monthly average15 mg/L≤ 12 mg/L25%

Limits in force (42)

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≤ 12 mg/Lall year001
Solids, total suspendeddaily maximum≤ 24 mg/Lall year001
Solids, total suspendedmonthly average≤ 17 lb/dall year001
Solids, total suspendeddaily maximum≤ 34 lb/dall year001
Nitrogen, ammonia total [as N]monthly average≤ 2.7 mg/LMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]monthly average≤ 2.3 mg/LJun–Aug001
Nitrogen, ammonia total [as N]monthly average≤ 4 mg/LJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 15 mg/LMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 15 mg/LJun–Aug001
Nitrogen, ammonia total [as N]daily maximum≤ 10.1 mg/LJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 3.9 lb/dMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]monthly average≤ 3.3 lb/dJun–Aug001
Nitrogen, ammonia total [as N]monthly average≤ 5.7 lb/dJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 22 lb/dMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 22 lb/dJun–Aug001
Nitrogen, ammonia total [as N]daily maximum≤ 14 lb/dJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]weekly average≤ 6.7 mg/LMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]weekly average≤ 5.7 mg/LJun–Aug001
Nitrogen, ammonia total [as N]weekly average≤ 10 mg/LJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]weekly average≤ 9.6 lb/dMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]weekly average≤ 8.2 lb/dJun–Aug001
Nitrogen, ammonia total [as N]weekly average≤ 14 lb/dJan, Feb, Nov, Dec001
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/LMay–Oct001
Chlorine, total residualdaily maximum≤ .05 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Coliform, fecal generaldaily maximum≤ 400 #/100mLMay–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≤ 14 lb/dall year001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 29 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.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/IL0080128 · MCP: https://passage-data.com/mcp