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Rockton, Village of

Sewage treatment plant, Rockton, Illinois. NPDES permit IL0030791, in force until May 31, 2027. Last 12 months: over a limit 3 times (last May 2026), 3 of 24 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: outfall 001 form 0 monthly (19 values), outfall INF form L monthly (4 values)
Renewal application due
Dec 2, 2026 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 24 reports late

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

Period endingParameterReportedLimitOver by
March 2026Nitrogen, ammonia total [as N], daily maximum10 mg/L≤ 9 mg/L11%
April 2026Nitrogen, ammonia total [as N], daily maximum8.4 mg/L≤ 6.8 mg/L24%
May 2026Nitrogen, ammonia total [as N], daily maximum12 mg/L≤ 6.8 mg/L76%

Limits in force (48)

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≤ 407 lb/dall year001
Solids, total suspendedweekly average≤ 610 lb/dall year001
Nitrogen, ammonia total [as N]daily maximum≤ 6.8 mg/LMay001
Nitrogen, ammonia total [as N]daily maximum≤ 6.8 mg/LApr001
Nitrogen, ammonia total [as N]daily maximum≤ 9 mg/LJan001
Nitrogen, ammonia total [as N]daily maximum≤ 6.8 mg/LAug001
Nitrogen, ammonia total [as N]daily maximum≤ 6.8 mg/LJun001
Nitrogen, ammonia total [as N]daily maximum≤ 9 mg/LDec001
Nitrogen, ammonia total [as N]daily maximum≤ 6.8 mg/LSep001
Nitrogen, ammonia total [as N]daily maximum≤ 9 mg/LFeb001
Nitrogen, ammonia total [as N]daily maximum≤ 6.8 mg/LJul001
Nitrogen, ammonia total [as N]daily maximum≤ 9 mg/LMar001
Nitrogen, ammonia total [as N]daily maximum≤ 6.8 mg/LOct001
Nitrogen, ammonia total [as N]daily maximum≤ 9 mg/LNov001
Nitrogen, ammonia total [as N]daily maximum≤ 92 lb/dMay001
Nitrogen, ammonia total [as N]daily maximum≤ 92 lb/dApr001
Nitrogen, ammonia total [as N]daily maximum≤ 122 lb/dJan001
Nitrogen, ammonia total [as N]daily maximum≤ 92 lb/dAug001
Nitrogen, ammonia total [as N]daily maximum≤ 92 lb/dJun001
Nitrogen, ammonia total [as N]daily maximum≤ 122 lb/dDec001
Nitrogen, ammonia total [as N]daily maximum≤ 92 lb/dSep001
Nitrogen, ammonia total [as N]daily maximum≤ 122 lb/dFeb001
Nitrogen, ammonia total [as N]daily maximum≤ 92 lb/dJul001
Nitrogen, ammonia total [as N]daily maximum≤ 122 lb/dMar001
Nitrogen, ammonia total [as N]daily maximum≤ 92 lb/dOct001
Nitrogen, ammonia total [as N]daily maximum≤ 122 lb/dNov001
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≤ 25 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 40 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 339 lb/dall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 542 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/IL0030791 · MCP: https://passage-data.com/mcp