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Mahoning TWP Armstrong Cnty

Sewage treatment plant, Distant, Pennsylvania. NPDES permit PA0252581, in force until Dec 31, 2028. Last 12 months: over a limit 6 times (last May 2026), 22 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (22 values), form Q quarterly (1 value), form Y yearly
Last report on file
June 2026
Oct 2024 – Sep 2025
11 values over a limit, 0 required values missing, 0 of 17 reports late

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

Period endingParameterReportedLimitOver by
October 2025Nitrogen, ammonia total [as N], monthly average1.8 mg/L≤ 1.5 mg/L20%
February 2026Nitrogen, ammonia total [as N], instantaneous maximum9.77 mg/L≤ 6 mg/L63%
February 2026Nitrogen, ammonia total [as N], monthly average4.94 mg/L≤ 3 mg/L65%
May 2026Nitrogen, ammonia total [as N], instantaneous maximum10.9 mg/L≤ 3 mg/L263%
May 2026Nitrogen, ammonia total [as N], monthly average2≤ 1.1 lb/d82%
May 2026Nitrogen, ammonia total [as N], monthly average6.74 mg/L≤ 1.5 mg/L349%

Limits in force (30)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]instantaneous minimum≥ 6 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
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedinstantaneous maximum≤ 60 mg/Lall year
Solids, total suspendedmonthly average≤ 22.5 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]daily maximumreport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 3 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]instantaneous maximum≤ 3 mg/LMay–Oct
Nitrogen, ammonia total [as N]instantaneous maximum≤ 6 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 1.1 lb/dMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 2.3 lb/dJan, Feb, Mar, Apr, Nov, Dec
Phosphorus, total [as P]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≤ .08 mg/Lall year
Chlorine, total residualinstantaneous maximum≤ .2 mg/Lall year
E. coliinstantaneous maximumreport only (#/100mL)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≤ 25 mg/Lall year
BOD, carbonaceous [5 day, 20 C]instantaneous maximum≤ 50 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 18.8 lb/dall year

New limits from Jan 31, 2027

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Chlorine, total residual, instantaneous maximum0.04 mg/Ltighter0.06 mg/L (9 values)1.5×
Chlorine, total residual, monthly average0.01 mg/Ltighter0.04 mg/L (9 values)4×

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/PA0252581 · MCP: https://passage-data.com/mcp