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Leaf River, Village of

Sewage treatment plant, Leaf River, Illinois. NPDES permit IL0029475, in force until Jul 31, 2029. Last 12 months: over a limit 49 times (last August 2026). 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
August 2026
Oct 2024 – Sep 2025
33 values over a limit, 0 required values missing, 0 of 24 reports late

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

All 49 values over a limit
Period endingParameterReportedLimitOver by
October 2025Nitrogen, ammonia total [as N], daily maximum16.9 mg/L≤ 4.7 mg/L260%
October 2025Nitrogen, ammonia total [as N], daily maximum5.92 lb/d≤ 5.5 lb/d8%
October 2025Nitrogen, ammonia total [as N], monthly average16.9 mg/L≤ 1.8 mg/L839%
October 2025Nitrogen, ammonia total [as N], monthly average5.92 lb/d≤ 2.1 lb/d182%
October 2025Nitrogen, ammonia total [as N], weekly average16.9 mg/L≤ 4.4 mg/L284%
October 2025Nitrogen, ammonia total [as N], weekly average5.92 lb/d≤ 5.1 lb/d16%
November 2025Nitrogen, ammonia total [as N], daily maximum17.8 mg/L≤ 5.7 mg/L212%
November 2025Nitrogen, ammonia total [as N], monthly average17.8 mg/L≤ 4.2 mg/L324%
December 2025Nitrogen, ammonia total [as N], daily maximum12.7 mg/L≤ 5.7 mg/L123%
December 2025Nitrogen, ammonia total [as N], monthly average12.7 mg/L≤ 4.2 mg/L202%
January 2026Nitrogen, ammonia total [as N], daily maximum22.3 mg/L≤ 5.7 mg/L291%
January 2026Nitrogen, ammonia total [as N], monthly average22.3 mg/L≤ 4.2 mg/L431%
January 2026Nitrogen, ammonia total [as N], monthly average5.579 lb/d≤ 4.9 lb/d14%
February 2026Nitrogen, ammonia total [as N], daily maximum32.2 mg/L≤ 5.7 mg/L465%
February 2026Nitrogen, ammonia total [as N], daily maximum7.519 lb/d≤ 6.7 lb/d12%
February 2026Nitrogen, ammonia total [as N], monthly average32.2 mg/L≤ 4.2 mg/L667%
February 2026Nitrogen, ammonia total [as N], monthly average7.519 lb/d≤ 4.9 lb/d53%
March 2026Nitrogen, ammonia total [as N], daily maximum23.9 mg/L≤ 4.7 mg/L409%
March 2026Nitrogen, ammonia total [as N], daily maximum5.78 lb/d≤ 5.5 lb/d5%
March 2026Nitrogen, ammonia total [as N], monthly average23.9 mg/L≤ 1.8 mg/L1228%
March 2026Nitrogen, ammonia total [as N], monthly average5.78 lb/d≤ 2.1 lb/d175%
March 2026Nitrogen, ammonia total [as N], weekly average23.9 mg/L≤ 4.4 mg/L443%
March 2026Nitrogen, ammonia total [as N], weekly average5.78 lb/d≤ 5.1 lb/d13%
April 2026Nitrogen, ammonia total [as N], daily maximum16.2 mg/L≤ 4.7 mg/L245%
April 2026Nitrogen, ammonia total [as N], daily maximum5.945 lb/d≤ 5.5 lb/d8%
April 2026Nitrogen, ammonia total [as N], monthly average16.2 mg/L≤ 1.8 mg/L800%
April 2026Nitrogen, ammonia total [as N], monthly average5.945 lb/d≤ 2.1 lb/d183%
April 2026Nitrogen, ammonia total [as N], weekly average16.2 mg/L≤ 4.4 mg/L268%
April 2026Nitrogen, ammonia total [as N], weekly average5.945 lb/d≤ 5.1 lb/d17%
May 2026Nitrogen, ammonia total [as N], daily maximum16.7 mg/L≤ 4.7 mg/L255%
May 2026Nitrogen, ammonia total [as N], monthly average16.7 mg/L≤ 1.8 mg/L828%
May 2026Nitrogen, ammonia total [as N], monthly average5.432 lb/d≤ 2.1 lb/d159%
May 2026Nitrogen, ammonia total [as N], weekly average16.7 mg/L≤ 4.4 mg/L280%
May 2026Nitrogen, ammonia total [as N], weekly average5.432 lb/d≤ 5.1 lb/d7%
June 2026Nitrogen, ammonia total [as N], daily maximum9.93 mg/L≤ 7.1 mg/L40%
June 2026Nitrogen, ammonia total [as N], monthly average4.555 lb/d≤ 1.8 lb/d153%
June 2026Nitrogen, ammonia total [as N], monthly average9.93 mg/L≤ 1.5 mg/L562%
June 2026Nitrogen, ammonia total [as N], weekly average4.555 lb/d≤ 4.4 lb/d4%
June 2026Nitrogen, ammonia total [as N], weekly average9.93 mg/L≤ 3.8 mg/L161%
July 2026Nitrogen, ammonia total [as N], daily maximum11 mg/L≤ 7.1 mg/L55%
July 2026Nitrogen, ammonia total [as N], monthly average11 mg/L≤ 1.5 mg/L633%
July 2026Nitrogen, ammonia total [as N], monthly average2.936 lb/d≤ 1.8 lb/d63%
July 2026Nitrogen, ammonia total [as N], weekly average11 mg/L≤ 3.8 mg/L189%
July 2026Oxygen, dissolved [DO], minimum weekly average5.62 mg/L≥ 6.25 mg/L10%
August 2026Nitrogen, ammonia total [as N], daily maximum15.2 mg/L≤ 7.1 mg/L114%
August 2026Nitrogen, ammonia total [as N], monthly average15.2 mg/L≤ 1.5 mg/L913%
August 2026Nitrogen, ammonia total [as N], monthly average3.93 lb/d≤ 1.8 lb/d118%
August 2026Nitrogen, ammonia total [as N], weekly average15.2 mg/L≤ 3.8 mg/L300%
August 2026Oxygen, dissolved [DO], monthly average minimum5.54 mg/L≥ 6 mg/L8%

Limits in force (39)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]monthly average minimum≥ 6 mg/LJan, Feb, Aug, Sep, Oct, Nov, Dec001
Oxygen, dissolved [DO]minimum weekly average≥ 4.5 mg/LJan, Feb, Aug, Sep, Oct, Nov, Dec001
Oxygen, dissolved [DO]minimum weekly average≥ 6.25 mg/LMar–Jul001
Oxygen, dissolved [DO]daily minimum≥ 4 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≤ 30 mg/Lall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 35 lb/dall year001
Solids, total suspendedweekly average≤ 53 lb/dall year001
Nitrogen, ammonia total [as N]monthly average≤ 1.8 mg/LMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LJun–Aug001
Nitrogen, ammonia total [as N]monthly average≤ 4.2 mg/LJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 4.7 mg/LMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 7.1 mg/LJun–Aug001
Nitrogen, ammonia total [as N]daily maximum≤ 5.7 mg/LJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 2.1 lb/dMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]monthly average≤ 1.8 lb/dJun–Aug001
Nitrogen, ammonia total [as N]monthly average≤ 4.9 lb/dJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 5.5 lb/dMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 8.3 lb/dJun–Aug001
Nitrogen, ammonia total [as N]daily maximum≤ 6.7 lb/dJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]weekly average≤ 4.4 mg/LMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]weekly average≤ 3.8 mg/LJun–Aug001
Nitrogen, ammonia total [as N]weekly average≤ 5.1 lb/dMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]weekly average≤ 4.4 lb/dJun–Aug001
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≤ 29 lb/dall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 47 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/IL0029475 · MCP: https://passage-data.com/mcp