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Western Butler Cnty Auth

Sewage treatment plant, major discharger, Zelienople, Pennsylvania. NPDES permit PA0021504 expired Dec 31, 2023; its limits still apply. Last 12 months: over a limit 9 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 (2 values)
Last report on file
June 2026
Oct 2024 – Sep 2025
11 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 2025Coliform, fecal general, instantaneous maximum> 24200 #/100mL≤ 10000 #/100mL—
January 2026Coliform, fecal general, instantaneous maximum> 24200 #/100mL≤ 10000 #/100mL—
April 2026Coliform, fecal general, instantaneous maximum> 24200 #/100mL≤ 10000 #/100mL—
May 2026Coliform, fecal general, geometric mean424 #/100mL≤ 200 #/100mL112%
May 2026Coliform, fecal general, instantaneous maximum24200 #/100mL≤ 1000 #/100mL2320%
May 2026Nitrogen, ammonia total [as N], monthly average12.15 mg/L≤ 6 mg/L103%
May 2026Nitrogen, ammonia total [as N], monthly average129≤ 110 lb/d17%
June 2026Coliform, fecal general, geometric mean3307 #/100mL≤ 200 #/100mL1554%
June 2026Coliform, fecal general, instantaneous maximum17330 #/100mL≤ 1000 #/100mL1633%

Limits in force (35)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]instantaneous 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
pHinstantaneous minimum≥ 6 SUall year
pHinstantaneous maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 550 lb/dall year
Solids, total suspendedweekly average≤ 826 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≤ 6 mg/LMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 18 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 110 lb/dMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 330 lb/dJan, Feb, Mar, Apr, Nov, Dec
Phosphorus, total [as P]monthly average≤ 2 mg/Lall year
Phosphorus, total [as P]monthly average≤ 37 lb/dall year
Lead, total [as Pb]quarterly averagereport only (mg/L)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantweekly averagereport only (MGD)all year
Chlorine, total residualmonthly average≤ .17 mg/Lall year
Chlorine, total residualinstantaneous maximum≤ .55 mg/Lall year
Coliform, fecal generalgeometric mean≤ 2000 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
Coliform, fecal generalgeometric mean≤ 200 #/100mLMay–Sep
Coliform, fecal generalinstantaneous maximum≤ 10000 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
Coliform, fecal generalinstantaneous maximum≤ 1000 #/100mLMay–Sep
BOD, carbonaceous [5 day, 20 C]monthly average≤ 15 mg/LMay–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]weekly average≤ 20 mg/LMay–Oct
BOD, carbonaceous [5 day, 20 C]weekly average≤ 40 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 275 lb/dMay–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 459 lb/dJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]weekly average≤ 367 lb/dMay–Oct
BOD, carbonaceous [5 day, 20 C]weekly average≤ 734 lb/dJan, Feb, Mar, Apr, Nov, Dec

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/PA0021504 · MCP: https://passage-data.com/mcp