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Spring Grove, Village of

Sewage treatment plant, Spring Grove, Illinois. NPDES permit IL0074985, in force until Feb 28, 2030. Last 12 months: over a limit 59 times (last August 2026), 15 of 24 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: outfall 001 form 0 monthly (25 values), outfall INF form L monthly (4 values), outfall 001 form S twice a year
Last report on file
August 2026
Oct 2024 – Sep 2025
99 values over a limit, 56 required values missing, 12 of 26 reports late

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

All 59 values over a limit
Period endingParameterReportedLimitOver by
October 2025Coliform, fecal general, daily maximumT≤ 400 #/100mL—
October 2025Nitrogen, ammonia total [as N], daily maximum4.86 mg/L≤ 4.7 mg/L3%
October 2025Nitrogen, ammonia total [as N], monthly average2.636 mg/L≤ 1.3 mg/L103%
October 2025Nitrogen, ammonia total [as N], weekly average4.86 mg/L≤ 3.8 mg/L28%
November 2025Coliform, fecal general, daily maximumT≤ 400 #/100mL—
November 2025Nitrogen, ammonia total [as N], daily maximum5.63 mg/L≤ 3.5 mg/L61%
November 2025Nitrogen, ammonia total [as N], monthly average3.288 mg/L≤ 2.4 mg/L37%
December 2025Coliform, fecal general, daily maximumT≤ 400 #/100mL—
December 2025Nitrogen, ammonia total [as N], daily maximum10 mg/L≤ 3.5 mg/L186%
December 2025Nitrogen, ammonia total [as N], monthly average5.925 mg/L≤ 2.4 mg/L147%
January 2026Coliform, fecal general, daily maximumT≤ 400 #/100mL—
January 2026Nitrogen, ammonia total [as N], daily maximum23.1 mg/L≤ 3.5 mg/L560%
January 2026Nitrogen, ammonia total [as N], monthly average12.852 mg/L≤ 2.4 mg/L436%
January 2026Solids, total suspended, monthly average37 mg/L≤ 30 mg/L23%
January 2026Solids, total suspended, weekly average48 mg/L≤ 45 mg/L7%
February 2026Coliform, fecal general, daily maximumT≤ 400 #/100mL—
February 2026Nitrogen, ammonia total [as N], daily maximum23.3 mg/L≤ 3.5 mg/L566%
February 2026Nitrogen, ammonia total [as N], daily maximum5.635 lb/d≤ 5.5 lb/d2%
February 2026Nitrogen, ammonia total [as N], monthly average15.25 mg/L≤ 2.4 mg/L535%
March 2026Coliform, fecal general, daily maximumT≤ 400 #/100mL—
March 2026Nitrogen, ammonia total [as N], daily maximum9.05 mg/L≤ 4.9 mg/L85%
March 2026Nitrogen, ammonia total [as N], monthly average7.09 mg/L≤ 1.5 mg/L373%
March 2026Nitrogen, ammonia total [as N], weekly average9.05 mg/L≤ 3.8 mg/L138%
April 2026BOD, carbonaceous [5 day, 20 C], weekly average43 mg/L≤ 40 mg/L8%
April 2026Coliform, fecal general, daily maximumT≤ 400 #/100mL—
April 2026Nitrogen, ammonia total [as N], daily maximum12.377 lb/d≤ 7.4 lb/d67%
April 2026Nitrogen, ammonia total [as N], daily maximum15.3 mg/L≤ 4.7 mg/L226%
April 2026Nitrogen, ammonia total [as N], monthly average7.012 lb/d≤ 2 lb/d251%
April 2026Nitrogen, ammonia total [as N], monthly average8.668 mg/L≤ 1.3 mg/L567%
April 2026Nitrogen, ammonia total [as N], weekly average12.377 lb/d≤ 5.9 lb/d110%
April 2026Nitrogen, ammonia total [as N], weekly average15.3 mg/L≤ 3.8 mg/L303%
April 2026Solids, total suspended, monthly average47.4 mg/L≤ 30 mg/L58%
April 2026Solids, total suspended, weekly average72 mg/L≤ 45 mg/L60%
May 2026Coliform, fecal general, daily maximumT≤ 400 #/100mL—
May 2026Nitrogen, ammonia total [as N], daily maximum7.91 mg/L≤ 4.7 mg/L68%
May 2026Nitrogen, ammonia total [as N], monthly average3.643 lb/d≤ 2 lb/d82%
May 2026Nitrogen, ammonia total [as N], monthly average6.933 mg/L≤ 1.3 mg/L433%
May 2026Nitrogen, ammonia total [as N], weekly average7.91 mg/L≤ 3.8 mg/L108%
June 2026Coliform, fecal general, daily maximumT≤ 400 #/100mL—
June 2026Nitrogen, ammonia total [as N], daily maximum10.4 mg/L≤ 4.7 mg/L121%
June 2026Nitrogen, ammonia total [as N], monthly average3.291 lb/d≤ 1.6 lb/d106%
June 2026Nitrogen, ammonia total [as N], monthly average4.698 mg/L≤ 1 mg/L370%
June 2026Nitrogen, ammonia total [as N], weekly average10.4 mg/L≤ 2.5 mg/L316%
June 2026Nitrogen, ammonia total [as N], weekly average7.286 lb/d≤ 3.9 lb/d87%
June 2026Solids, total suspended, monthly average31 mg/L≤ 30 mg/L3%
June 2026Solids, total suspended, weekly average78 mg/L≤ 45 mg/L73%
July 2026Coliform, fecal general, daily maximumT≤ 400 #/100mL—
July 2026Nitrogen, ammonia total [as N], daily maximum13.8 mg/L≤ 4.7 mg/L194%
July 2026Nitrogen, ammonia total [as N], daily maximum8.402 lb/d≤ 7.4 lb/d14%
July 2026Nitrogen, ammonia total [as N], monthly average4.472 lb/d≤ 1.6 lb/d180%
July 2026Nitrogen, ammonia total [as N], monthly average7.346 mg/L≤ 1 mg/L635%
July 2026Nitrogen, ammonia total [as N], weekly average13.8 mg/L≤ 2.5 mg/L452%
July 2026Nitrogen, ammonia total [as N], weekly average8.402 lb/d≤ 3.9 lb/d115%
August 2026Coliform, fecal general, daily maximumT≤ 400 #/100mL—
August 2026Nitrogen, ammonia total [as N], daily maximum6.33 mg/L≤ 4.7 mg/L35%
August 2026Nitrogen, ammonia total [as N], monthly average2.36 lb/d≤ 1.6 lb/d48%
August 2026Nitrogen, ammonia total [as N], monthly average3.253 mg/L≤ 1 mg/L225%
August 2026Nitrogen, ammonia total [as N], weekly average4.593 lb/d≤ 3.9 lb/d18%
August 2026Nitrogen, ammonia total [as N], weekly average6.33 mg/L≤ 2.5 mg/L153%

Limits in force (87)

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≤ 47 lb/dall year001
Solids, total suspendedweekly average≤ 70 lb/dall year001
Oil & Greasedaily maximumreport only (mg/L)all year001
Oil & Greasedaily maximumreport only (mg/L)all year001
Nitrogen, ammonia total [as N]monthly average≤ 2.4 mg/LJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LMar001
Nitrogen, ammonia total [as N]monthly average≤ 1.3 mg/LApr, May, Sep, Oct001
Nitrogen, ammonia total [as N]monthly average≤ 1 mg/LJun–Aug001
Nitrogen, ammonia total [as N]daily maximum≤ 3.5 mg/LJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 4.9 mg/LMar001
Nitrogen, ammonia total [as N]daily maximum≤ 4.7 mg/LApr, May, Sep, Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 4.7 mg/LJun–Aug001
Nitrogen, ammonia total [as N]monthly average≤ 3.8 lb/dJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 2.4 lb/dMar001
Nitrogen, ammonia total [as N]monthly average≤ 2 lb/dApr, May, Sep, Oct001
Nitrogen, ammonia total [as N]monthly average≤ 1.6 lb/dJun–Aug001
Nitrogen, ammonia total [as N]daily maximum≤ 5.5 lb/dJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 7.7 lb/dMar001
Nitrogen, ammonia total [as N]daily maximum≤ 7.4 lb/dApr, May, Sep, Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 7.4 lb/dJun–Aug001
Nitrogen, ammonia total [as N]weekly average≤ 3.8 mg/LApr, May, Sep, Oct001
Nitrogen, ammonia total [as N]weekly average≤ 2.5 mg/LJun–Aug001
Nitrogen, ammonia total [as N]weekly average≤ 3.8 mg/LMar001
Nitrogen, ammonia total [as N]weekly average≤ 5.9 lb/dApr, May, Sep, Oct001
Nitrogen, ammonia total [as N]weekly average≤ 3.9 lb/dJun–Aug001
Nitrogen, ammonia total [as N]weekly average≤ 5.9 lb/dMar001
Phosphorus, total [as P]daily maximumreport only (mg/L)all year001
Cyanide, total [as CN]daily maximumreport only (ug/L)all year001
Cyanide, total [as CN]daily maximumreport only (ug/L)all year001
Cyanide, free [amenable to chlorination]daily maximumreport only (ug/L)all year001
Cyanide, free [amenable to chlorination]daily maximumreport only (ug/L)all year001
Fluoride, total [as F]daily maximumreport only (mg/L)all year001
Fluoride, total [as F]daily maximumreport only (mg/L)all year001
Arsenic, total [as As]daily maximumreport only (mg/L)all year001
Arsenic, total [as As]daily maximumreport only (mg/L)all year001
Barium, total [as Ba]daily maximumreport only (mg/L)all year001
Barium, total [as Ba]daily maximumreport only (mg/L)all year001
Cadmium, total [as Cd]daily maximumreport only (mg/L)all year001
Cadmium, total [as Cd]daily maximumreport only (mg/L)all year001
Chromium, hexavalent [as Cr]daily maximumreport only (mg/L)all year001
Chromium, hexavalent [as Cr]daily maximumreport only (mg/L)all year001
Chromium, total [as Cr]daily maximumreport only (mg/L)all year001
Chromium, total [as Cr]daily maximumreport only (mg/L)all year001
Copper, total [as Cu]daily maximumreport only (mg/L)all year001
Copper, total [as Cu]daily maximumreport only (mg/L)all year001
Iron, total [as Fe]daily maximumreport only (mg/L)all year001
Iron, total [as Fe]daily maximumreport only (mg/L)all year001
Iron, dissolved [as Fe]daily maximumreport only (mg/L)all year001
Iron, dissolved [as Fe]daily maximumreport only (mg/L)all year001
Lead, total [as Pb]daily maximumreport only (mg/L)all year001
Lead, total [as Pb]daily maximumreport only (mg/L)all year001
Manganese, total [as Mn]daily maximumreport only (mg/L)all year001
Manganese, total [as Mn]daily maximumreport only (mg/L)all year001
Nickel, total [as Ni]daily maximumreport only (mg/L)all year001
Nickel, total [as Ni]daily maximumreport only (mg/L)all year001
Silver, total [as Ag]daily maximumreport only (mg/L)all year001
Silver, total [as Ag]daily maximumreport only (mg/L)all year001
Zinc, total [as Zn]daily maximumreport only (mg/L)all year001
Zinc, total [as Zn]daily maximumreport only (mg/L)all year001
Selenium, total [as Se]daily maximumreport only (mg/L)all year001
Selenium, total [as Se]daily maximumreport only (mg/L)all year001
Phenolics, total recoverabledaily maximumreport only (mg/L)all year001
Phenolics, total recoverabledaily 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
Mercury, total [as Hg]daily maximumreport only (ng/L)all year001
Mercury, total [as Hg]daily maximumreport only (ng/L)all year001
Mercury, total [as Hg]daily maximumreport only (ng/L)all year001
Coliform, fecal generaldaily maximum≤ 400 #/100mLall year001
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≤ 39 lb/dall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 63 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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Your permit document is the final word. As JSON: /api/v1/permits/IL0074985 · MCP: https://passage-data.com/mcp