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Upper Uwchlan TWP Muni Auth

Sewerage Systems, Atglen, Pennsylvania. NPDES permit PA0036374, in force until Jan 31, 2028. Last 12 months: over a limit once (last April 2026), 32 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (32 values), form Q quarterly (1 value), form Y yearly
Renewal application due
Aug 4, 2027 · 180 days before expiry; your permit may set another date
Last report on file
June 2026
Oct 2024 – Sep 2025
1 value over a limit, 3 required values missing, 0 of 17 reports late

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

Period endingParameterReportedLimitOver by
April 2026Phosphorus, total [as P], monthly average.53 mg/L≤ .5 mg/L6%

Limits in force (44)

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
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≤ 3.8 lb/dall year
Solids, total suspendedweekly average≤ 5.6 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedmonthly averagereport only (lb/d)all year
Oil & Greasequarterly average≤ 15 mg/Lall year
Nitrogen, total [as N]monthly average≤ 50 mg/Lall year
Nitrogen, total [as N]instantaneous maximum≤ 100 mg/Lall year
Nitrogen, total [as N]monthly average≤ 6.255 lb/dall year
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ .5 mg/LMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ .189 lb/dJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ .063 lb/dMay–Oct
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (lb/d)all year
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year
Nitrite + Nitrate total [as N]monthly averagereport only (lb/d)all year
Phosphorus, total [as P]monthly average≤ 1 mg/LJan, Feb, Mar, Nov, Dec
Phosphorus, total [as P]monthly average≤ .5 mg/LApr–Oct
Phosphorus, total [as P]monthly average≤ .126 lb/dJan, Feb, Mar, Nov, Dec
Phosphorus, total [as P]monthly average≤ .063 lb/dApr–Oct
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≤ .14 mg/Lall year
Chlorine, total residualinstantaneous maximum≤ .34 mg/Lall year
E. coliinstantaneous maximumreport only (#/100mL)all year
Coliform, fecal generalgeometric mean≤ 200 #/100mLMay–Sep
Coliform, fecal generalgeometric mean≤ 200 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
Coliform, fecal generalinstantaneous maximum≤ 1000 #/100mLMay–Sep
Coliform, fecal generalinstantaneous maximum≤ 1000 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 20 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/LMay–Oct
BOD, carbonaceous [5 day, 20 C]weekly average≤ 30 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]weekly average≤ 15 mg/LMay–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 2.5 lb/dJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 1.3 lb/dMay–Oct
BOD, carbonaceous [5 day, 20 C]weekly average≤ 3.8 lb/dJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]weekly average≤ 1.9 lb/dMay–Oct

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/PA0036374 · MCP: https://passage-data.com/mcp