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Prairie Path Water Company

Sewerage Systems, Barrington, Illinois. NPDES permit IL0070874, in force until Sep 30, 2029. Last 12 months: over a limit 2 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: outfall 001 form 0 monthly (38 values), outfall INF form L monthly (4 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
8 values over a limit, 0 required values missing, 4 of 24 reports late

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

Period endingParameterReportedLimitOver by
May 2026Coliform, fecal general, daily maximum> 2420 #/100mL≤ 400 #/100mL—
June 2026Oxygen, dissolved [DO], daily minimum3.4 mg/L≥ 5 mg/L32%

Limits in force (46)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]monthly average minimum≥ 5.5 mg/LJan, Feb, Aug, Sep, Oct, Nov, Dec001
Oxygen, dissolved [DO]monthly average minimum≥ 5.5 mg/LJan, Feb, Aug, Sep, Oct, Nov, Dec001
Oxygen, dissolved [DO]minimum weekly average≥ 6 mg/LMar–Jul001
Oxygen, dissolved [DO]minimum weekly average≥ 6 mg/LMar–Jul001
Oxygen, dissolved [DO]minimum weekly average≥ 4 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]daily minimum≥ 5 mg/LMar–Jul001
Oxygen, dissolved [DO]daily minimum≥ 5 mg/LMar–Jul001
Oxygen, dissolved [DO]daily minimum≥ 3.5 mg/LJan, Feb, Aug, Sep, Oct, Nov, Dec001
Oxygen, dissolved [DO]daily minimum≥ 3.5 mg/LJan, Feb, Aug, Sep, Oct, Nov, Dec001
pHminimum≥ 6 SUall year001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 13 lb/dall year001
Solids, total suspendedmonthly average≤ 13 lb/dall year001
Solids, total suspendedweekly average≤ 19 lb/dall year001
Solids, total suspendedweekly average≤ 19 lb/dall year001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year001
Phosphorus, total [as P]daily maximumreport only (mg/L)all year001
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 plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Chlorine, total residualdaily maximum≤ .05 mg/Lall year001
Chlorine, total residualdaily maximum≤ .05 mg/Lall year001
Coliform, fecal generaldaily maximum≤ 400 #/100mLall 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]monthly average≤ 25 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 40 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 40 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 11 lb/dall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 11 lb/dall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 17 lb/dall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 17 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

New limits from Oct 1, 2028

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Nitrogen, ammonia total [as N], daily maximum4.4 mg/L (Mar, Apr, May, Sep, Oct)new18.5 mg/L (4 values)4.2×
Nitrogen, ammonia total [as N], daily maximum5.2 mg/L (Jan, Feb, Nov, Dec)new10.6 mg/L (4 values)2.04×
Nitrogen, ammonia total [as N], daily maximum5.1 mg/L (Jun–Aug)new12 mg/L (3 values)2.35×
Nitrogen, ammonia total [as N], daily maximum1.8 lb/d (Mar, Apr, May, Sep, Oct)new——
Nitrogen, ammonia total [as N], daily maximum2.2 lb/d (Jan, Feb, Nov, Dec)new——
Nitrogen, ammonia total [as N], daily maximum2.1 lb/d (Jun–Aug)new——
Nitrogen, ammonia total [as N], monthly average1.2 mg/L (Mar, Apr, May, Sep, Oct)new——
Nitrogen, ammonia total [as N], monthly average0.5 lb/d (Mar, Apr, May, Sep, Oct)new——
Nitrogen, ammonia total [as N], monthly average3.2 mg/L (Jan, Feb, Nov, Dec)new——
Nitrogen, ammonia total [as N], monthly average1.3 lb/d (Jan, Feb, Nov, Dec)new——
Nitrogen, ammonia total [as N], monthly average1.2 mg/L (Jun–Aug)new——
Nitrogen, ammonia total [as N], monthly average0.5 lb/d (Jun–Aug)new——
Nitrogen, ammonia total [as N], weekly average1.3 lb/d (Mar–Oct)new——
Nitrogen, ammonia total [as N], weekly average3.2 mg/L (Mar–Oct)new——

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/IL0070874 · MCP: https://passage-data.com/mcp