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Illinois American Water

Sewerage Systems, Tolono, Illinois. NPDES permit IL0031453, in force until Nov 30, 2026. Last 12 months: over a limit 53 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: outfall 001 form 0 monthly (22 values), outfall 002 form 0 monthly (12 values), outfall INF form L monthly (4 values)
Renewal application due
Jun 3, 2026 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
53 values over a limit, 0 required values missing, 0 of 36 reports late

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

All 53 values over a limit
Period endingOutfallParameterReportedLimitOver by
October 2025001BOD, carbonaceous [5 day, 20 C], monthly average14.9 mg/L≤ 10 mg/L49%
October 2025001Nitrogen, ammonia total [as N], daily maximum11 mg/L≤ 3 mg/L267%
October 2025001Nitrogen, ammonia total [as N], monthly average6.6 mg/L≤ 1.5 mg/L340%
October 2025001Solids, total suspended, daily maximum52 mg/L≤ 24 mg/L117%
October 2025001Solids, total suspended, monthly average44 mg/L≤ 12 mg/L267%
November 2025001BOD, carbonaceous [5 day, 20 C], monthly average12 mg/L≤ 10 mg/L20%
November 2025001Nitrogen, ammonia total [as N], daily maximum9.4 mg/L≤ 4.7 mg/L100%
November 2025001Solids, total suspended, daily maximum67 mg/L≤ 24 mg/L179%
November 2025001Solids, total suspended, monthly average38.4 mg/L≤ 12 mg/L220%
December 2025001Nitrogen, ammonia total [as N], daily maximum14 mg/L≤ 4.7 mg/L198%
December 2025001Nitrogen, ammonia total [as N], monthly average8.69 mg/L≤ 4 mg/L117%
December 2025001Solids, total suspended, daily maximum40 mg/L≤ 24 mg/L67%
December 2025001Solids, total suspended, monthly average24.9 mg/L≤ 12 mg/L108%
January 2026001Nitrogen, ammonia total [as N], daily maximum8.1 mg/L≤ 4.7 mg/L72%
January 2026001Solids, total suspended, daily maximum25 mg/L≤ 24 mg/L4%
January 2026001Solids, total suspended, monthly average13.8 mg/L≤ 12 mg/L15%
February 2026001BOD, carbonaceous [5 day, 20 C], daily maximum23 mg/L≤ 20 mg/L15%
February 2026001BOD, carbonaceous [5 day, 20 C], monthly average12 mg/L≤ 10 mg/L20%
February 2026001Nitrogen, ammonia total [as N], daily maximum13 mg/L≤ 4.7 mg/L177%
February 2026001Nitrogen, ammonia total [as N], monthly average9.1 mg/L≤ 4 mg/L128%
February 2026001Solids, total suspended, daily maximum30 mg/L≤ 24 mg/L25%
February 2026001Solids, total suspended, monthly average21.3 mg/L≤ 12 mg/L78%
March 2026001Nitrogen, ammonia total [as N], daily maximum14 mg/L≤ 6.9 mg/L103%
March 2026001Nitrogen, ammonia total [as N], monthly average17.2 lb/d≤ 7.9 lb/d118%
March 2026001Nitrogen, ammonia total [as N], monthly average8.3 mg/L≤ 1.6 mg/L419%
March 2026001Nitrogen, ammonia total [as N], weekly average7.6 mg/L≤ 4 mg/L90%
March 2026001Solids, total suspended, daily maximum130 mg/L≤ 24 mg/L442%
March 2026001Solids, total suspended, daily maximum224 lb/d≤ 118 lb/d90%
March 2026001Solids, total suspended, monthly average39.3 mg/L≤ 12 mg/L228%
March 2026001Solids, total suspended, monthly average76 lb/d≤ 59 lb/d29%
March 2026002Coliform, fecal general, daily maximum> 2419.6 #/100mL≤ 400 #/100mL—
April 2026001Nitrogen, ammonia total [as N], daily maximum19 mg/L≤ 3 mg/L533%
April 2026001Nitrogen, ammonia total [as N], daily maximum37.9 lb/d≤ 15 lb/d153%
April 2026001Nitrogen, ammonia total [as N], monthly average16.13 lb/d≤ 7.4 lb/d118%
April 2026001Nitrogen, ammonia total [as N], monthly average8.1 mg/L≤ 1.5 mg/L440%
April 2026001Solids, total suspended, daily maximum170 lb/d≤ 118 lb/d44%
April 2026001Solids, total suspended, daily maximum81.6 mg/L≤ 24 mg/L240%
April 2026001Solids, total suspended, monthly average22.2 mg/L≤ 12 mg/L85%
May 2026001Nitrogen, ammonia total [as N], daily maximum18.6 lb/d≤ 15 lb/d24%
May 2026001Nitrogen, ammonia total [as N], daily maximum8.6 mg/L≤ 3 mg/L187%
May 2026001Nitrogen, ammonia total [as N], monthly average< 1.7 mg/L≤ 1.5 mg/L13%
May 2026001Solids, total suspended, daily maximum209 lb/d≤ 118 lb/d77%
May 2026001Solids, total suspended, daily maximum97 mg/L≤ 24 mg/L304%
May 2026001Solids, total suspended, monthly average< 26.4 mg/L≤ 12 mg/L120%
June 2026001Solids, total suspended, daily maximum32.9 mg/L≤ 24 mg/L37%
June 2026001Solids, total suspended, monthly average< 15 mg/L≤ 12 mg/L25%
July 2026001Nitrogen, ammonia total [as N], daily maximum4.8 mg/L≤ 3 mg/L60%
July 2026001Solids, total suspended, daily maximum32 mg/L≤ 24 mg/L33%
July 2026001Solids, total suspended, monthly average< 13.6 mg/L≤ 12 mg/L13%
August 2026001Nitrogen, ammonia total [as N], daily maximum3.7 mg/L≤ 3 mg/L23%
August 2026001Solids, total suspended, monthly average< 12.8 mg/L≤ 12 mg/L7%
September 2026001Solids, total suspended, daily maximum47 mg/L≤ 24 mg/L96%
September 2026001Solids, total suspended, monthly average25.5 mg/L≤ 12 mg/L113%

Limits in force (50)

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≤ 59 lb/dall year001
Solids, total suspendeddaily maximum≤ 118 lb/dall year001
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LApr–Oct001
Nitrogen, ammonia total [as N]monthly average≤ 4 mg/LJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 1.6 mg/LMar001
Nitrogen, ammonia total [as N]daily maximum≤ 3 mg/LApr–Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 4.7 mg/LJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 6.9 mg/LMar001
Nitrogen, ammonia total [as N]monthly average≤ 7.4 lb/dApr–Oct001
Nitrogen, ammonia total [as N]monthly average≤ 20 lb/dJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 7.9 lb/dMar001
Nitrogen, ammonia total [as N]daily maximum≤ 15 lb/dApr–Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 23 lb/dJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 34 lb/dMar001
Nitrogen, ammonia total [as N]weekly average≤ 4 mg/LMar001
Nitrogen, ammonia total [as N]weekly average≤ 20 lb/dMar001
Phosphorus, total [as P]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≤ 10 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 20 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 49 lb/dall year001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 98 lb/dall year001
Oxygen, dissolved [DO]daily minimumreport only (mg/L)all year002
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year002
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year002
pHminimum≥ 6 SUall year002
pHmaximum≤ 9 SUall year002
Solids, total suspendedmonthly average≤ 30 mg/Lall year002
Solids, total suspendedweekly average≤ 45 mg/Lall year002
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year002
Phosphorus, total [as P]daily maximumreport only (mg/L)all year002
Chlorine, total residualmonthly average≤ .75 mg/Lall year002
Coliform, fecal generaldaily maximum≤ 400 #/100mLall year002
Flow, totalmonthly totalreport only (MGD)all year002
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/IL0031453 · MCP: https://passage-data.com/mcp