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Riverton, Village of

Sewage treatment plant, Riverton, Illinois. NPDES permit IL0021041, in force until Jul 31, 2029. Last 12 months: over a limit 16 times (last July 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 (11 values), outfall A01 form 0 monthly (7 values), outfall B01 form 0 monthly (19 values), outfall INF form L monthly (4 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
23 values over a limit, 0 required values missing, 0 of 48 reports late

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

All 16 values over a limit
Period endingParameterReportedLimitOver by
November 2025Nitrogen, ammonia total [as N], daily maximum16 mg/L≤ 13.2 mg/L21%
December 2025Nitrogen, ammonia total [as N], daily maximum27 mg/L≤ 13.2 mg/L105%
January 2026BOD, carbonaceous [5 day, 20 C], monthly average30 mg/L≤ 25 mg/L20%
January 2026Nitrogen, ammonia total [as N], daily maximum34 mg/L≤ 13.2 mg/L158%
January 2026Oxygen, dissolved [DO], monthly average minimum5.3 mg/L≥ 5.5 mg/L4%
January 2026Solids, total suspended, monthly average44 mg/L≤ 37 mg/L19%
February 2026Nitrogen, ammonia total [as N], daily maximum30 mg/L≤ 13.2 mg/L127%
February 2026Solids, total suspended, monthly average100 mg/L≤ 37 mg/L170%
February 2026Solids, total suspended, weekly average100 mg/L≤ 45 mg/L122%
March 2026Nitrogen, ammonia total [as N], daily maximum17 mg/L≤ 13.3 mg/L28%
March 2026Solids, total suspended, monthly average44 mg/L≤ 37 mg/L19%
April 2026Solids, total suspended, monthly average71 mg/L≤ 37 mg/L92%
April 2026Solids, total suspended, weekly average71 mg/L≤ 45 mg/L58%
May 2026Coliform, fecal general, daily maximum1010 #/100mL≤ 400 #/100mL153%
May 2026Solids, total suspended, monthly average44 mg/L≤ 37 mg/L19%
July 2026Coliform, fecal general, daily maximum602 #/100mL≤ 400 #/100mL51%

Limits in force (48)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]monthly average minimumreport only (mg/L)all year001
Oxygen, dissolved [DO]minimum weekly averagereport only (mg/L)all year001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year001
Chlorine, total residualmonthly average≤ .75 mg/Lall year001
Flow, totalmonthly totalreport only (Mgal/mo)all year001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all yearA01
pHminimum≥ 6 SUall yearA01
pHmaximum≤ 9 SUall yearA01
Solids, total suspendedmonthly averagereport only (mg/L)all yearA01
Chlorine, total residualmonthly average≤ .75 mg/Lall yearA01
Coliform, fecal generaldaily maximum≤ 400 #/100mLall yearA01
Flow, totalmonthly totalreport only (Mgal/mo)all yearA01
Oxygen, dissolved [DO]monthly average minimum≥ 5.5 mg/LJan, Feb, Aug, Sep, Oct, Nov, DecB01
Oxygen, dissolved [DO]minimum weekly average≥ 4 mg/LJan, Feb, Aug, Sep, Oct, Nov, DecB01
Oxygen, dissolved [DO]minimum weekly average≥ 6 mg/LMar–JulB01
Oxygen, dissolved [DO]daily minimum≥ 3.5 mg/LJan, Feb, Aug, Sep, Oct, Nov, DecB01
Oxygen, dissolved [DO]daily minimum≥ 5 mg/LMar–JulB01
pHminimum≥ 6 SUall yearB01
pHmaximum≤ 9 SUall yearB01
Solids, total suspendedmonthly average≤ 37 mg/Lall yearB01
Solids, total suspendedweekly average≤ 45 mg/Lall yearB01
Solids, total suspendedmonthly average≤ 531 lb/dall yearB01
Solids, total suspendedweekly average≤ 646 lb/dall yearB01
Nitrogen, ammonia total [as N]daily maximum≤ 13.3 mg/LMar, Apr, May, Sep, OctB01
Nitrogen, ammonia total [as N]daily maximum≤ 17 mg/LJun–AugB01
Nitrogen, ammonia total [as N]daily maximum≤ 13.2 mg/LJan, Feb, Nov, DecB01
Nitrogen, ammonia total [as N]daily maximum≤ 191 lb/dMar, Apr, May, Sep, OctB01
Nitrogen, ammonia total [as N]daily maximum≤ 244 lb/dJun–AugB01
Nitrogen, ammonia total [as N]daily maximum≤ 189 lb/dJan, Feb, Nov, DecB01
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearB01
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearB01
Chlorine, total residualdaily maximum≤ .05 mg/LJan, Feb, Mar, Apr, Nov, DecB01
Chlorine, total residualdaily maximum≤ .05 mg/LMay–OctB01
Coliform, fecal generaldaily maximum≤ 400 #/100mLMay–OctB01
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall yearB01
BOD, carbonaceous [5 day, 20 C]weekly average≤ 40 mg/Lall yearB01
BOD, carbonaceous [5 day, 20 C]monthly average≤ 359 lb/dall yearB01
BOD, carbonaceous [5 day, 20 C]weekly average≤ 574 lb/dall yearB01
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/IL0021041 · MCP: https://passage-data.com/mcp