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Mercersburg Sew Auth Franklin Cnty

Sewage treatment plant, Mercersburg, Pennsylvania. NPDES permit PA0022179 expired Oct 31, 2023; its limits still apply. Last 12 months: over a limit 13 times (last June 2026), 39 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (39 values)
Last report on file
June 2026
Oct 2024 – Sep 2025
4 values over a limit, 0 required values missing, 0 of 12 reports late

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

All 13 values over a limit
Period endingParameterReportedLimitOver by
November 2025BOD, carbonaceous [5 day, 20 C], weekly average48 mg/L≤ 40 mg/L20%
December 2025BOD, carbonaceous [5 day, 20 C], weekly average62.7 mg/L≤ 40 mg/L57%
December 2025Solids, total suspended, weekly average51.2 mg/L≤ 45 mg/L14%
February 2026BOD, carbonaceous [5 day, 20 C], monthly average26 mg/L≤ 25 mg/L4%
February 2026BOD, carbonaceous [5 day, 20 C], weekly average50 mg/L≤ 40 mg/L25%
February 2026Solids, total suspended, monthly average72 mg/L≤ 30 mg/L140%
February 2026Solids, total suspended, monthly average81≤ 75 lb/d8%
February 2026Solids, total suspended, weekly average156 mg/L≤ 45 mg/L247%
February 2026Solids, total suspended, weekly average160≤ 112 lb/d43%
April 2026BOD, carbonaceous [5 day, 20 C], weekly average55.5 mg/L≤ 40 mg/L39%
May 2026Coliform, fecal general, instantaneous maximum1180 #/100mL≤ 1000 #/100mL18%
June 2026Coliform, fecal general, geometric mean359 #/100mL≤ 200 #/100mL80%
June 2026Coliform, fecal general, instantaneous maximum1400 #/100mL≤ 1000 #/100mL40%

Limits in force (47)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily 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
BOD, 5-day, 20 deg. Cdaily maximumreport only (lb/d)all year
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 75 lb/dall year
Solids, total suspendedweekly average≤ 112 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedmonthly averagereport only (lb/d)all year
Solids, total suspendeddaily maximumreport only (lb/d)all year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (lb/d)all year
Nitrogen, total [as N]daily maximumreport only (lb/d)all year
Nitrogen, ammonia total [as N]monthly average≤ 3 mg/LMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 9 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 7.5 lb/dMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 22.5 lb/dJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (lb/d)all year
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (lb/d)all year
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all year
Nitrite + Nitrate total [as N]monthly averagereport only (lb/d)all year
Nitrite + Nitrate total [as N]daily maximumreport only (lb/d)all year
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (lb/d)all year
Phosphorus, total [as P]daily maximumreport only (lb/d)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
Coliform, fecal generalgeometric mean≤ 200 #/100mLMay–Sep
Coliform, fecal generalgeometric mean≤ 2000 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
Coliform, fecal generalinstantaneous maximum≤ 1000 #/100mLMay–Sep
Coliform, fecal generalinstantaneous maximum≤ 10000 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 20 mg/LMay–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]weekly average≤ 30 mg/LMay–Oct
BOD, carbonaceous [5 day, 20 C]weekly average≤ 40 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 50 lb/dMay–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 62 lb/dJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]weekly average≤ 72 lb/dMay–Oct
BOD, carbonaceous [5 day, 20 C]weekly average≤ 100 lb/dJan, Feb, Mar, Apr, Nov, Dec

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/PA0022179 · MCP: https://passage-data.com/mcp