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W Mifflin Sani Sew & Stormwater Auth Allegheny Cnty

Sewage treatment plant, major discharger, West Mifflin, Pennsylvania. NPDES permit PA0026522, in force until Mar 31, 2031. Last 12 months: over a limit 4 times (last April 2026), 34 required values missing, 1 of 14 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (33 values), form Q quarterly, form Y yearly
Last report on file
June 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 0 of 17 reports late

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

Period endingParameterReportedLimitOver by
April 2026Nitrogen, ammonia total [as N], monthly average30.34≤ 28.32 lb/d7%
April 2026Nitrogen, ammonia total [as N], monthly average4.01 mg/L≤ 2.83 mg/L42%
April 2026Nitrogen, ammonia total [as N], weekly average4.59 mg/L≤ 4.24 mg/L8%
April 2026Nitrogen, ammonia total [as N], weekly average65.64≤ 42.43 lb/d55%

Limits in force (56)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]instantaneous minimum≥ 5 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
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≤ 300 lb/dall year
Solids, total suspendedweekly average≤ 450 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]annual averagereport only (mg/L)all year
Nitrogen, total [as N]annual averagereport only (lb/d)all year
Nitrogen, ammonia total [as N]monthly average≤ 2.83 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 1.92 mg/LMay–Oct
Nitrogen, ammonia total [as N]weekly average≤ 4.24 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 2.88 mg/LMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 28.32 lb/dJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 19.21 lb/dMay–Oct
Nitrogen, ammonia total [as N]weekly average≤ 42.43 lb/dJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 28.82 lb/dMay–Oct
Phosphorus, total [as P]annual averagereport only (mg/L)all year
Phosphorus, total [as P]annual averagereport only (lb/d)all year
Arsenic, total [as As]daily maximumreport only (mg/L)all year
Chromium, hexavalent [as Cr]daily maximumreport only (mg/L)all year
Copper, total [as Cu]monthly averagereport only (ug/L)all year
Copper, total [as Cu]daily maximumreport only (ug/L)all year
Iron, total [as Fe]quarterly averagereport only (mg/L)all year
Iron, total [as Fe]quarterly averagereport only (lb/d)all year
Iron, dissolved [as Fe]daily maximumreport only (mg/L)all year
Manganese, total [as Mn]quarterly averagereport only (mg/L)all year
Manganese, total [as Mn]quarterly averagereport only (lb/d)all year
Zinc, total [as Zn]monthly averagereport only (ug/L)all year
Zinc, total [as Zn]daily maximumreport only (ug/L)all year
Aluminum, total [as Al]quarterly averagereport only (mg/L)all year
Aluminum, total [as Al]quarterly averagereport only (lb/d)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
Cyanide, free availablemonthly averagereport only (ug/L)all year
Cyanide, free availabledaily maximumreport only (ug/L)all year
Perfluorooctanoic acid (PFOA)daily maximumreport only (ng/L)all year
Perfluorooctanesulfonatedaily maximumreport only (ng/L)all year
Perfluorobutanesulfonic acid (PFBS)daily maximumreport only (ng/L)all year
Hexafluoropropylene oxide dimer acid (HFPO-DA)daily maximumreport only (ng/L)all year
Ultraviolet light dosageinstantaneous minimumreport only (mW-sec/cm2)all year
Ultraviolet light dosagemonthly averagereport only (mW-sec/cm2)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≤ 37.5 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 250 lb/dall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 376 lb/dall year

New limits from Apr 1, 2029

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Copper, total [as Cu], daily maximum14 ug/Lnew5 ug/L (3 values, 1 below detection)0.357×
Copper, total [as Cu], monthly average0.094 lb/dnew——
Copper, total [as Cu], monthly average9.37 ug/Lnew5 ug/L (3 values, 1 below detection)0.534×
Copper, total [as Cu], weekly average0.14 lb/dnew——
Cyanide, free available, daily maximum6.27 ug/Lnew1 ug/L (3 values, 1 below detection)0.159×
Cyanide, free available, monthly average4.02 ug/Lnew1 ug/L (3 values, 1 below detection)0.249×
Cyanide, free available, monthly average0.04 lb/dnew——
Cyanide, free available, weekly average0.063 lb/dnew——
Zinc, total [as Zn], daily maximum120 ug/Lnew100 ug/L (3 values)0.833×
Zinc, total [as Zn], monthly average120 ug/Lnew100 ug/L (3 values)0.833×
Zinc, total [as Zn], monthly average1.2 lb/dnew——
Zinc, total [as Zn], weekly average1.2 lb/dnew——

How strict are these limits?

Cited limits by parameter: Pennsylvania's rules and the federal ones.

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Your permit document is the final word. As JSON: /api/v1/permits/PA0026522 · MCP: https://passage-data.com/mcp