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Whitemarsh TWP Auth Montgomery Cnty

Sewage treatment plant, major discharger, Lafayette Hill, Pennsylvania. NPDES permit PA0026298, in force until Jan 31, 2029. Last 12 months: over a limit 11 times (last April 2026), 29 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (29 values), form Q quarterly (11 values), form Y yearly
Last report on file
June 2026
Oct 2024 – Sep 2025
3 values over a limit, 1 required value missing, 1 of 17 reports late

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

Period endingParameterReportedLimitOver by
October 2025Coliform, fecal general, instantaneous maximum9800 #/100mL≤ 1000 #/100mL880%
December 2025Nitrogen, ammonia total [as N], monthly average25 mg/L≤ 20 mg/L25%
January 2026BOD, carbonaceous [5 day, 20 C], monthly average29 mg/L≤ 25 mg/L16%
January 2026BOD, carbonaceous [5 day, 20 C], weekly average41 mg/L≤ 40 mg/L3%
January 2026Nitrogen, ammonia total [as N], monthly average27 mg/L≤ 20 mg/L35%
February 2026BOD, carbonaceous [5 day, 20 C], monthly average37 mg/L≤ 25 mg/L48%
February 2026BOD, carbonaceous [5 day, 20 C], weekly average54 mg/L≤ 40 mg/L35%
February 2026Nitrogen, ammonia total [as N], monthly average30 mg/L≤ 20 mg/L50%
March 2026BOD, carbonaceous [5 day, 20 C], monthly average26 mg/L≤ 25 mg/L4%
March 2026Nitrogen, ammonia total [as N], monthly average27 mg/L≤ 20 mg/L35%
April 2026Nitrogen, ammonia total [as N], monthly average23 mg/L≤ 20 mg/L15%

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≤ 500 lb/dall year
Solids, total suspendedweekly average≤ 750 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 averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly average≤ 20 mg/Lall year
Nitrogen, ammonia total [as N]monthly average≤ 333 lb/dall year
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (lb/d)all year
Copper, total [as Cu]quarterly averagereport only (mg/L)all year
Thallium, total [as Tl]quarterly averagereport only (mg/L)all year
Zinc, total [as Zn]quarterly averagereport only (mg/L)all year
Aluminum, total [as Al]quarterly averagereport only (mg/L)all year
Acroleinquarterly averagereport only (mg/L)all 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≤ .5 mg/Lall year
Chlorine, total residualinstantaneous maximum≤ 1.3 mg/Lall year
E. coliinstantaneous maximumreport only (#/100mL)all year
PCBs Wet Weather Analysisdaily maximumreport only (pg/L)all year
PCBs Dry Weather Analysisdaily maximumreport only (pg/L)all year
Toxicity [chronic], Ceriodaphnia dubiadaily maximumreport only (tox chronic)all year
Toxicity [chronic], Pimephales promelas [Fathead Minnow]daily maximumreport only (tox chronic)all year
Solids, total dissolvedquarterly average≤ 1000 mg/Lall year
Solids, total dissolveddaily maximum≤ 2000 mg/Lall year
Coliform, fecal generalgeometric mean≤ 200 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
Coliform, fecal generalgeometric mean≤ 200 #/100mLMay–Sep
Coliform, fecal generalinstantaneous maximum≤ 1000 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
Coliform, fecal generalinstantaneous maximum≤ 1000 #/100mLMay–Sep
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 40 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 417 lb/dall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 667 lb/dall year
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (lb/d)all year
TU Static 7Day Chronic Ceriodaphnia dubiadaily maximumreport only (tox chronic)all year
Static 7Day Chronic Pimephales Promelasdaily maximumreport only (tox chronic)all year

How strict are these limits?

Cited limits by parameter: Pennsylvania's rules and the federal ones.

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/PA0026298 · MCP: https://passage-data.com/mcp