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Monongahela City Washington Cnty

Sewage treatment plant, major discharger, Monongahela, Pennsylvania. NPDES permit PA0025950 expired Oct 31, 2018; its limits still apply. Last 12 months: over a limit 7 times (last June 2026), 25 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (25 values), form Q quarterly (3 values)
Last report on file
June 2026
Oct 2024 – Sep 2025
3 values over a limit, 0 required values missing, 1 of 16 reports late

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

Period endingParameterReportedLimitOver by
November 2025Coliform, fecal general, instantaneous maximum> 2420 CFU/100mL≤ 10000 CFU/100mL—
February 2026Coliform, fecal general, instantaneous maximum> 9678 CFU/100mL≤ 10000 CFU/100mL—
March 2026Coliform, fecal general, instantaneous maximum> 9678 CFU/100mL≤ 10000 CFU/100mL—
April 2026pH, minimum5.7 SU≥ 6 SU—
May 2026pH, minimum5.5 SU≥ 6 SU—
June 2026Solids, total suspended, weekly average105 mg/L≤ 45 mg/L133%
June 2026Solids, total suspended, weekly average743≤ 563 lb/d32%

Limits in force (30)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]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
BOD, 5-day, 20 deg. Cdaily maximumreport only (lb/d)all year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 376 lb/dall year
Solids, total suspendedweekly average≤ 563 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedmonthly averagereport only (lb/d)all year
Solids, total suspendeddaily maximumreport only (lb/d)all year
Nitrogen, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly averagereport only (lb/d)all year
Phosphorus, total [as P]daily maximumreport only (mg/L)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
Chlorine, total residualmonthly average≤ .5 mg/Lall year
Chlorine, total residualinstantaneous maximum≤ 1.6 mg/Lall year
Toxicity [acute], Pimephales promelas [Fathead Minnow]daily maximum≤ 3.2 tox acuteall year
Coliform, fecal generalgeometric mean≤ 200 CFU/100mLMay–Sep
Coliform, fecal generalgeometric mean≤ 2000 CFU/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
Coliform, fecal generalinstantaneous maximum≤ 1000 CFU/100mLMay–Sep
Coliform, fecal generalinstantaneous maximum≤ 10000 CFU/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≤ 313 lb/dall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 469 lb/dall year

How strict are these limits?

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/PA0025950 · MCP: https://passage-data.com/mcp