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Potlatch, City of

Sewage treatment plant, Potlatch, Idaho. NPDES permit ID0022501 expired Nov 30, 2025; its limits still apply. Last 12 months: over a limit 20 times (last June 2026), 1 of 25 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: outfall 001 form M monthly (5 values), outfall REC1 form Q quarterly (4 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 1 of 25 reports late

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

All 20 values over a limit
Period endingParameterReportedLimitOver by
January 2026Solids, suspended percent removal, monthly average minimum80.2 %≥ 85 %32%
January 2026Solids, total suspended, monthly average123.7 lb/d≤ 100 lb/d24%
February 2026BOD, 5-day, percent removal, monthly average minimum80.1 %≥ 85 %33%
February 2026Solids, suspended percent removal, monthly average minimum76 %≥ 85 %60%
February 2026Solids, total suspended, monthly average35 mg/L≤ 30 mg/L17%
March 2026BOD, 5-day, 20 deg. C, monthly average104 lb/d≤ 100 lb/d4%
March 2026BOD, 5-day, percent removal, monthly average minimum78.1 %≥ 85 %46%
March 2026Solids, suspended percent removal, monthly average minimum56.3 %≥ 85 %191%
March 2026Solids, total suspended, monthly average177.6 lb/d≤ 100 lb/d78%
March 2026Solids, total suspended, monthly average43.4 mg/L≤ 30 mg/L45%
April 2026BOD, 5-day, 20 deg. C, monthly average164.5 lb/d≤ 100 lb/d65%
April 2026Solids, suspended percent removal, monthly average minimum82.7 %≥ 85 %15%
April 2026Solids, total suspended, monthly average118 lb/d≤ 100 lb/d18%
May 2026BOD, 5-day, 20 deg. C, monthly average32.4 mg/L≤ 30 mg/L8%
May 2026BOD, 5-day, percent removal, monthly average minimum74.3 %≥ 85 %71%
May 2026Solids, suspended percent removal, monthly average minimum66 %≥ 85 %127%
May 2026Solids, total suspended, monthly average37.5 mg/L≤ 30 mg/L25%
June 2026BOD, 5-day, 20 deg. C, monthly average31.4 mg/L≤ 30 mg/L5%
June 2026Solids, suspended percent removal, monthly average minimum60 %≥ 85 %167%
June 2026Solids, total suspended, monthly average68.9 mg/L≤ 30 mg/L130%

Limits in force (29)

ParameterStatisticLimitMonthsOutfall
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/LJan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec001
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/LJan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec001
BOD, 5-day, 20 deg. Cmonthly average≤ 100 lb/dJan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec001
BOD, 5-day, 20 deg. Cweekly average≤ 150 lb/dJan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year001
BOD, 5-day, 20 deg. Cweekly averagereport only (mg/L)all year001
pHinstantaneous minimum≥ 6.5 SUJan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec001
pHinstantaneous maximum≤ 9 SUJan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec001
Solids, total suspendedmonthly average≤ 30 mg/LJan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec001
Solids, total suspendedweekly average≤ 45 mg/LJan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec001
Solids, total suspendedmonthly average≤ 100 lb/dJan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec001
Solids, total suspendedweekly average≤ 150 lb/dJan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec001
Solids, total suspendedmonthly averagereport only (mg/L)all year001
Solids, total suspendedweekly averagereport only (mg/L)all year001
Nitrogen, ammonia total [as N]monthly average≤ 21.48 mg/LJan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec001
E. coli, MTEC-MFmonthly geometric mean≤ 126 #/100mLJan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec001
E. coli, MTEC-MFinstantaneous maximumreport only (#/100mL)Jan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)Jan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Chlorine, total residualmonthly average≤ .05 mg/LJan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec001
Chlorine, total residualdaily maximum≤ .05 mg/LJan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec001
Chlorine, total residualmonthly average≤ .17 lb/dJan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec001
Chlorine, total residualdaily maximum≤ .17 lb/dJan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %Jan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec001
Solids, suspended percent removalmonthly average minimum≥ 85 %Jan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec001
Temperature, water deg. centigradedaily maximumreport only (deg C)Mar, Apr, Jun, Sep, DecREC1
pHinstantaneous minimumreport only (SU)Mar, Jun, Sep, DecREC1
pHinstantaneous maximumreport only (SU)Mar, Jun, Sep, DecREC1
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)Mar, Jun, Sep, DecREC1

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/ID0022501 · MCP: https://passage-data.com/mcp