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Boro of West Chester

Sewage treatment plant, major discharger, West Chester, Pennsylvania. NPDES permit PA0026018, in force until Apr 30, 2029. Last 12 months: over a limit once (last February 2026), 34 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (34 values), outfall 001 form Q quarterly (12 values), outfall 003 form Y yearly
Last report on file
June 2026
Oct 2024 – Sep 2025
2 values over a limit, 0 required values missing, 0 of 17 reports late

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

Period endingParameterReportedLimitOver by
February 2026Nitrogen, total [as N], monthly average33 mg/L≤ 30 mg/L10%

Limits in force (60)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year001
BOD, 5-day, 20 deg. Cmonthly averagereport only (lb/d)all year001
pHinstantaneous minimum≥ 6 SUall year001
pHinstantaneous maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 15 mg/Lall year001
Solids, total suspendedweekly average≤ 23 mg/Lall year001
Solids, total suspendedmonthly average≤ 188 lb/dall year001
Solids, total suspendedweekly average≤ 282 lb/dall year001
Solids, total suspendedmonthly averagereport only (mg/L)all year001
Solids, total suspendedmonthly averagereport only (lb/d)all year001
Nitrogen, total [as N]monthly average≤ 30 mg/Lall year001
Nitrogen, total [as N]monthly average≤ 375 lb/dall year001
Nitrogen, ammonia total [as N]monthly average≤ 2.5 mg/LMay–Oct001
Nitrogen, ammonia total [as N]monthly average≤ 7.5 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 31 lb/dMay–Oct001
Nitrogen, ammonia total [as N]monthly average≤ 94 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Phosphorus, total [as P]monthly average≤ 1.6 mg/LApr–Oct001
Phosphorus, total [as P]monthly average≤ 2 mg/LJan, Feb, Mar, Nov, Dec001
Phosphorus, total [as P]monthly average≤ 20 lb/dApr–Oct001
Phosphorus, total [as P]monthly average≤ 25 lb/dJan, Feb, Mar, Nov, Dec001
Copper, total [as Cu]quarterly averagereport only (mg/L)all year001
Copper, total [as Cu]quarterly averagereport only (lb/d)all year001
Zinc, total [as Zn]quarterly averagereport only (mg/L)all year001
Zinc, total [as Zn]quarterly averagereport only (lb/d)all year001
Aluminum, total [as Al]monthly average≤ .75 mg/Lall year001
Aluminum, total [as Al]daily maximum≤ 1.03 mg/Lall year001
Aluminum, total [as Al]monthly average≤ 9.38 lb/dall year001
Aluminum, total [as Al]daily maximum≤ 12.8 lb/dall year001
Chloroformquarterly averagereport only (mg/L)all year001
Chloroformquarterly averagereport only (lb/d)all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Chlorine, total residualmonthly average≤ .05 mg/Lall year001
Chlorine, total residualinstantaneous maximum≤ .15 mg/Lall year001
E. coliinstantaneous maximumreport only (#/100mL)all year001
Toxicity [chronic], Ceriodaphnia dubiadaily maximumreport only (tox chronic)all year001
Toxicity [chronic], Pimephales promelas [Fathead Minnow]daily maximumreport only (tox chronic)all year001
Solids, total dissolvedquarterly averagereport only (mg/L)all year001
Solids, total dissolvedquarterly averagereport only (lb/d)all year001
Coliform, fecal generalgeometric mean≤ 200 #/100mLMay–Sep001
Coliform, fecal generalgeometric mean≤ 200 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec001
Coliform, fecal generalinstantaneous maximum≤ 1000 #/100mLMay–Sep001
Coliform, fecal generalinstantaneous maximum≤ 1000 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 40 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 311.4 lb/dall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 475 lb/dall year001
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year001
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (lb/d)all year001
TU Static 7Day Chronic Ceriodaphnia dubiadaily maximumreport only (tox chronic)all year001
Static 7Day Chronic Pimephales Promelasdaily maximumreport only (tox chronic)all year001
Oxygen demand, chem. [high level] [COD]daily maximumreport only (mg/L)all year003
pHdaily maximumreport only (SU)all year003
Solids, total suspendeddaily maximumreport only (mg/L)all year003
Oil & Greasedaily maximumreport only (mg/L)all year003
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all year003
Phosphorus, total [as P]daily maximumreport only (mg/L)all year003
Iron, dissolved [as Fe]daily maximumreport only (mg/L)all year003
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (mg/L)all year003

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/PA0026018 · MCP: https://passage-data.com/mcp