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Upper Merion Sanitary and Stormwater Auth

Sewage treatment plant, major discharger, King Of Prussia, Pennsylvania. NPDES permit PA0026131, in force until Jun 30, 2029. Last 12 months: over a limit 4 times (last February 2026), 32 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 002 form A monthly (32 values), outfall 002 form Q quarterly, outfall 002 form Y yearly, outfall 003 form Y yearly
Last report on file
June 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 18 reports late

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

Period endingParameterReportedLimitOver by
December 2025Chlorine, total residual, instantaneous maximum1.3 mg/L≤ 1.2 mg/L8%
February 2026BOD, carbonaceous [5 day, 20 C], monthly average40.1 mg/L≤ 25 mg/L60%
February 2026BOD, carbonaceous [5 day, 20 C], weekly average67.8 mg/L≤ 40 mg/L70%
February 2026Nitrogen, ammonia total [as N], monthly average24.85 mg/L≤ 20 mg/L24%

Limits in force (53)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/Lall year002
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year002
BOD, 5-day, 20 deg. Cmonthly averagereport only (lb/d)all year002
pHinstantaneous minimum≥ 6 SUall year002
pHinstantaneous maximum≤ 9 SUall year002
Solids, total suspendedmonthly average≤ 30 mg/Lall year002
Solids, total suspendedweekly average≤ 45 mg/Lall year002
Solids, total suspendedmonthly average≤ 1500 lb/dall year002
Solids, total suspendedweekly average≤ 2250 lb/dall year002
Solids, total suspendedmonthly averagereport only (mg/L)all year002
Solids, total suspendedmonthly averagereport only (lb/d)all year002
Nitrogen, total [as N]monthly averagereport only (mg/L)all year002
Nitrogen, total [as N]monthly averagereport only (lb/d)all year002
Nitrogen, ammonia total [as N]monthly average≤ 15 mg/LMay–Oct002
Nitrogen, ammonia total [as N]monthly average≤ 20 mg/LJan, Feb, Mar, Apr, Nov, Dec002
Nitrogen, ammonia total [as N]monthly average≤ 750 lb/dMay–Oct002
Nitrogen, ammonia total [as N]monthly average≤ 1000 lb/dJan, Feb, Mar, Apr, Nov, Dec002
Phosphorus, total [as P]monthly averagereport only (mg/L)all year002
Phosphorus, total [as P]monthly averagereport only (lb/d)all year002
Copper, total [as Cu]monthly average≤ .041 mg/Lall year002
Copper, total [as Cu]daily maximum≤ .048 mg/Lall year002
Copper, total [as Cu]monthly average≤ 2.05 lb/dall year002
Copper, total [as Cu]daily maximum≤ 2.4 lb/dall year002
Zinc, total [as Zn]quarterly averagereport only (mg/L)all year002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
Chlorine, total residualmonthly average≤ .5 mg/Lall year002
Chlorine, total residualinstantaneous maximum≤ 1.2 mg/Lall year002
E. coliinstantaneous maximumreport only (#/100mL)all year002
PCBs Dry Weather Analysisdaily maximumreport only (pg/L)all year002
Toxicity [chronic], Ceriodaphnia dubiadaily maximumreport only (tox chronic)all year002
Toxicity [chronic], Pimephales promelas [Fathead Minnow]daily maximumreport only (tox chronic)all year002
Solids, total dissolvedquarterly average≤ 1000 mg/Lall year002
Solids, total dissolvedquarterly averagereport only (lb/d)all year002
Coliform, fecal generalgeometric mean≤ 200 #/100mLMay–Sep002
Coliform, fecal generalgeometric mean≤ 200 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec002
Coliform, fecal generalinstantaneous maximum≤ 1000 #/100mLMay–Sep002
Coliform, fecal generalinstantaneous maximum≤ 1000 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec002
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall year002
BOD, carbonaceous [5 day, 20 C]weekly average≤ 40 mg/Lall year002
BOD, carbonaceous [5 day, 20 C]monthly average≤ 1251 lb/dall year002
BOD, carbonaceous [5 day, 20 C]weekly average≤ 2000 lb/dall year002
TU Static 7Day Chronic Ceriodaphnia dubiadaily maximumreport only (tox chronic)all year002
Static 7Day Chronic Pimephales Promelasdaily maximumreport only (tox chronic)all year002
Oxygen demand, chem. [high level] [COD]annual averagereport only (mg/L)all year003
pHannual averagereport only (SU)all year003
Solids, total suspendedannual averagereport only (mg/L)all year003
Oil & Greaseannual averagereport only (mg/L)all year003
Nitrogen, Kjeldahl, total [as N]annual averagereport only (mg/L)all year003
Phosphorus, total [as P]annual averagereport only (mg/L)all year003
Iron, dissolved [as Fe]annual averagereport only (mg/L)all year003
Coliform, fecal generalannual averagereport only (#/100mL)all year003
BOD, carbonaceous [5 day, 20 C]annual averagereport 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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Your permit document is the final word. As JSON: /api/v1/permits/PA0026131 · MCP: https://passage-data.com/mcp