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Parma, City of

Sewage treatment plant, Parma, Idaho. NPDES permit ID0021776 expired Mar 31, 2022; its limits still apply. Last 12 months: over a limit 21 times (last September 2026), 4 required values missing, 7 of 40 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: form A monthly (20 values), form A2 monthly (4 values), form A3 monthly (1 value), form Q quarterly (2 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
25 values over a limit, 2 required values missing, 10 of 40 reports late

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

All 21 values over a limit
Period endingParameterReportedLimitOver by
October 2025BOD, 5-day, 20 deg. C, monthly average36 mg/L≤ 30 mg/L20%
October 2025BOD, 5-day, percent removal, monthly average minimum77 %≥ 85 %53%
March 2026pH, instantaneous minimum0 SU≥ 6.5 SU—
April 2026E. coli, MTEC-MF, instantaneous maximum2400 #/100mL≤ 576 #/100mL317%
June 2026Solids, suspended percent removal, monthly average minimum80 %≥ 85 %33%
June 2026Solids, total suspended, monthly average58 mg/L≤ 30 mg/L93%
June 2026Solids, total suspended, weekly average58 mg/L≤ 45 mg/L29%
July 2026BOD, 5-day, 20 deg. C, monthly average56 mg/L≤ 30 mg/L87%
July 2026BOD, 5-day, 20 deg. C, weekly average56 mg/L≤ 45 mg/L24%
July 2026Solids, total suspended, monthly average34 mg/L≤ 30 mg/L13%
July 2026Solids, total suspended, rolling average24.75 mg/L≤ 17.5 mg/L41%
July 2026pH, instantaneous minimum0 SU≥ 6.5 SU—
August 2026BOD, 5-day, 20 deg. C, monthly average50 mg/L≤ 30 mg/L67%
August 2026BOD, 5-day, 20 deg. C, weekly average50 mg/L≤ 45 mg/L11%
August 2026E. coli, MTEC-MF, instantaneous maximum2400 #/100mL≤ 576 #/100mL317%
August 2026Phosphorus, total [as P], monthly average9.88 lb/d≤ 6.46 lb/d53%
August 2026Solids, total suspended, monthly average50 mg/L≤ 30 mg/L67%
August 2026Solids, total suspended, rolling average34.2 mg/L≤ 17.5 mg/L95%
August 2026Solids, total suspended, weekly average50 mg/L≤ 45 mg/L11%
September 2026Phosphorus, total [as P], monthly average7.76 lb/d≤ 6.46 lb/d20%
September 2026Solids, total suspended, rolling average42.5 mg/L≤ 17.5 mg/L143%

Limits in force (27)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]instantaneous minimumreport only (mg/L)all year
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 170 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 255 lb/dall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
pHinstantaneous minimum≥ 6.5 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≤ 170 lb/dall year
Solids, total suspendedweekly average≤ 255 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedrolling average≤ 17.5 mg/Lall year
Solids, total suspendedrolling average≤ 99.2 lb/dall year
Nitrogen, ammonia total [as N]instantaneous maximumreport only (mg/L)all year
Phosphorus, total [as P]monthly average≤ 6.46 lb/dall year
E. coli, MTEC-MFmonthly average≤ 126 #/100mLall year
E. coli, MTEC-MFinstantaneous maximum≤ 576 #/100mLall 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≤ .074 mg/Lall year
Chlorine, total residualdaily maximum≤ .186 mg/Lall year
Chlorine, total residualmonthly average≤ .42 lb/dall year
Chlorine, total residualdaily maximum≤ 1.05 lb/dall year
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year

How strict are these limits?

Cited limits by parameter: Idaho'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/ID0021776 · MCP: https://passage-data.com/mcp