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Shenango TWP Muni Auth Mercer Cnty

Sewage treatment plant, West Middlesex, Pennsylvania. NPDES permit PA0103471, in force until Sep 30, 2030. Last 12 months: over a limit 9 times (last May 2026), 23 required values missing, 1 of 13 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (22 values), form Q quarterly
Last report on file
June 2026
Oct 2024 – Sep 2025
6 values over a limit, 0 required values missing, 0 of 16 reports late

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

Period endingParameterReportedLimitOver by
December 2025Solids, total suspended, monthly average143≤ 125 lb/d14%
December 2025Solids, total suspended, monthly average43.7 mg/L≤ 30 mg/L46%
December 2025Solids, total suspended, weekly average229≤ 190 lb/d21%
December 2025Solids, total suspended, weekly average70 mg/L≤ 45 mg/L56%
January 2026Solids, total suspended, weekly average211≤ 190 lb/d11%
January 2026Solids, total suspended, weekly average69 mg/L≤ 45 mg/L53%
April 2026Solids, total suspended, weekly average309≤ 190 lb/d63%
May 2026Coliform, fecal general, geometric mean2072 #/100mL≤ 200 #/100mL936%
May 2026Coliform, fecal general, instantaneous maximum2420 #/100mL≤ 1000 #/100mL142%

Limits in force (29)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 4 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cmonthly averagereport only (lb/d)all year
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 125 lb/dall year
Solids, total suspendedweekly average≤ 190 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedmonthly averagereport only (lb/d)all year
Nitrogen, total [as N]quarterly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly average≤ 25 mg/LMay–Oct
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 106 lb/dMay–Oct
Nitrogen, ammonia total [as N]monthly averagereport only (lb/d)Jan, Feb, Mar, Apr, Nov, Dec
Phosphorus, total [as P]quarterly averagereport only (mg/L)all year
Ultraviolet light intensitydaily minimumreport only (uW/cm2)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
E. coliinstantaneous maximumreport only (#/100mL)all year
Coliform, fecal generalgeometric mean≤ 200 #/100mLMay–Sep
Coliform, fecal generalgeometric mean≤ 2000 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
Coliform, fecal generalinstantaneous maximum≤ 1000 #/100mLMay–Sep
Coliform, fecal generalinstantaneous maximum≤ 10000 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 40 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 106 lb/dall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 170 lb/dall year

Cited limits by parameter: Pennsylvania'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/PA0103471 · MCP: https://passage-data.com/mcp