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Downingtown Area Reg Auth

Sewage treatment plant, major discharger, Downingtown, Pennsylvania. NPDES permit PA0026531, in force until Nov 30, 2028. Last 12 months: no values over a limit, 38 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (38 values), outfall 001 form Q quarterly (18 values), outfall 002 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

Limits in force (73)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]instantaneous minimum≥ 6 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≤ 30 mg/Lall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 1877 lb/dall year001
Solids, total suspendedweekly average≤ 2815 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≤ 1877 lb/dall year001
Nitrogen, ammonia total [as N]monthly average≤ 2 mg/LMay–Oct001
Nitrogen, ammonia total [as N]monthly average≤ 6 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 125 lb/dMay–Oct001
Nitrogen, ammonia total [as N]monthly average≤ 375 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Phosphorus, total [as P]monthly average≤ 2 mg/Lall year001
Phosphorus, total [as P]monthly average≤ 125 lb/dall year001
Hardness, total [as CaCO3]monthly averagereport only (mg/L)all year001
Hardness, total [as CaCO3]instantaneous maximumreport only (mg/L)all year001
Hardness, total [as CaCO3]monthly averagereport only (lb/d)all year001
Hardness, total [as CaCO3]daily maximumreport only (lb/d)all year001
Chloride [as Cl]quarterly averagereport only (mg/L)all year001
Chloride [as Cl]quarterly averagereport only (lb/d)all year001
Copper, total [as Cu]monthly averagereport only (mg/L)all year001
Copper, total [as Cu]daily maximumreport only (mg/L)all year001
Copper, total [as Cu]monthly averagereport only (lb/d)all year001
Copper, total [as Cu]daily maximumreport only (lb/d)all year001
Iron, total [as Fe]quarterly averagereport only (mg/L)all year001
Iron, total [as Fe]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
Phenolics, total recoverablequarterly averagereport only (mg/L)all year001
Phenolics, total recoverablequarterly 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≤ .5 mg/Lall year001
Chlorine, total residualinstantaneous maximum≤ 1.6 mg/Lall year001
E. coliinstantaneous maximumreport only (#/100mL)all year001
Cyanide, free availablequarterly averagereport only (mg/L)all year001
Cyanide, free availablequarterly averagereport only (lb/d)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 average≤ 1000 mg/Lall year001
Solids, total dissolveddaily maximum≤ 2000 mg/Lall year001
Solids, total dissolvedquarterly average≤ 62550 lb/dall year001
Solids, total dissolveddaily maximum≤ 125100 lb/dall 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≤ 10 mg/LMay–Oct001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 20 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 15 mg/LMay–Oct001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 30 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 626 lb/dMay–Oct001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 1251 lb/dJan, Feb, Mar, Apr, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 938 lb/dMay–Oct001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 1877 lb/dJan, Feb, Mar, Apr, Nov, Dec001
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 year002
pHdaily maximumreport only (SU)all year002
Solids, total suspendeddaily maximumreport only (mg/L)all year002
Oil & Greasedaily maximumreport only (mg/L)all year002
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all year002
Phosphorus, total [as P]daily maximumreport only (mg/L)all year002
Iron, dissolved [as Fe]daily maximumreport only (mg/L)all year002
Coliform, fecal generaldaily maximumreport only (#/100mL)all year002
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (mg/L)all year002

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/PA0026531 · MCP: https://passage-data.com/mcp