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Derry Boro Muni Auth Westmoreland Cnty

Sewage treatment plant, Derry, Pennsylvania. NPDES permit PA0020788 expired May 31, 2026; its limits still apply. Last 12 months: no values over a limit, 35 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (35 values), form Q quarterly (1 value), form Y yearly
Last report on file
June 2026
Oct 2024 – Sep 2025
7 values over a limit, 0 required values missing, 0 of 17 reports late

Limits in force (47)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 6 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cweekly 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≤ 163 lb/dall year
Solids, total suspendedweekly average≤ 245 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedweekly 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]annual averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly average≤ 5.5 mg/LJan, Feb, Mar, Apr, Dec
Nitrogen, ammonia total [as N]monthly average≤ 2 mg/LMay–Oct
Nitrogen, ammonia total [as N]weekly average≤ 8.3 mg/LJan, Feb, Mar, Apr, Dec
Nitrogen, ammonia total [as N]weekly average≤ 3 mg/LMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 30 lb/dJan, Feb, Mar, Apr, Dec
Nitrogen, ammonia total [as N]monthly average≤ 10.9 lb/dMay–Oct
Phosphorus, total [as P]annual averagereport only (mg/L)all year
Chloride [as Cl]monthly averagereport only (mg/L)all year
Chloride [as Cl]daily maximumreport 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≤ .11 mg/Lall year
Chlorine, total residualinstantaneous maximum≤ .38 mg/Lall year
E. coliinstantaneous maximumreport only (#/100mL)all year
Solids, total dissolvedmonthly averagereport only (mg/L)all year
Solids, total dissolveddaily maximumreport only (mg/L)all year
Solids, total dissolvedmonthly averagereport only (lb/d)all year
Bromide [as Br]monthly averagereport only (mg/L)all year
Bromide [as Br]daily maximumreport only (mg/L)all year
Coliform, fecal generalgeometric mean≤ 2000 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
Coliform, fecal generalgeometric mean≤ 200 #/100mLMay–Sep
Coliform, fecal generalinstantaneous maximum≤ 10000 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
Coliform, fecal generalinstantaneous maximum≤ 1000 #/100mLMay–Sep
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 17 mg/LMay–Oct
BOD, carbonaceous [5 day, 20 C]weekly average≤ 37.5 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]weekly average≤ 25 mg/LMay–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 136 lb/dJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 92 lb/dMay–Oct
BOD, carbonaceous [5 day, 20 C]weekly average≤ 204 lb/dJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]weekly average≤ 136 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/PA0020788 · MCP: https://passage-data.com/mcp