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Avondale Boro Chester Cnty

Sewage treatment plant, Avondale, Pennsylvania. NPDES permit PA0025488, in force until May 31, 2029. Last 12 months: over a limit 6 times (last May 2026), 27 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 29 days after each period: form A monthly (27 values), form Q quarterly (1 value)
Last report on file
June 2026
Oct 2024 – Sep 2025
2 values over a limit, 1 required value missing, 1 of 16 reports late

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

Period endingParameterReportedLimitOver by
January 2026Phosphorus, total [as P], monthly average2.13 mg/L≤ 2 mg/L7%
January 2026Solids, total suspended, monthly average115.02≤ 75 lb/d53%
January 2026Solids, total suspended, monthly average< 45.75 mg/L≤ 18 mg/L154%
January 2026Solids, total suspended, weekly average115.02≤ 112.5 lb/d2%
January 2026Solids, total suspended, weekly average< 45.74 mg/L≤ 27 mg/L69%
May 2026Phosphorus, total [as P], monthly average2.44 mg/L≤ 2 mg/L22%

Limits in force (34)

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≤ 18 mg/Lall year
Solids, total suspendedweekly average≤ 27 mg/Lall year
Solids, total suspendedmonthly average≤ 75 lb/dall year
Solids, total suspendedweekly average≤ 112.5 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]monthly average≤ 20 mg/Lall year
Nitrogen, total [as N]monthly average≤ 83.4 lb/dall year
Nitrogen, ammonia total [as N]monthly average≤ 1.2 mg/LMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 3.6 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 5 lb/dMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 15 lb/dJan, Feb, Mar, Apr, Nov, Dec
Phosphorus, total [as P]monthly average≤ 2 mg/Lall year
Phosphorus, total [as P]monthly average≤ 8 lb/dall 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≤ .4 mg/Lall year
Chlorine, total residualinstantaneous maximum≤ .8 mg/Lall year
E. coliinstantaneous maximumreport only (#/100mL)all year
Coliform, fecal generalgeometric mean≤ 200 #/100mLall year
Coliform, fecal generalinstantaneous maximum≤ 1000 #/100mLall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 15 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]weekly average≤ 23 mg/LMay–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 104 lb/dJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 62.5 lb/dMay–Oct
BOD, carbonaceous [5 day, 20 C]weekly average≤ 167 lb/dJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]weekly average≤ 96 lb/dMay–Oct

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/PA0025488 · MCP: https://passage-data.com/mcp