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Cottonwood, City of

Sewage treatment plant, Cottonwood, Idaho. NPDES permit ID0021849 expired Aug 31, 2026; its limits still apply. Last 12 months: over a limit 3 times (last April 2026), 3 required values missing. Source: EPA ECHO, Oct 22, 2026.

Last report on file
April 2026
Oct 2024 – Sep 2025
7 values over a limit, 0 required values missing, 0 of 18 reports late

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

Period endingParameterReportedLimitOver by
March 2026BOD, 5-day, percent removal, monthly average minimum80.7 %≥ 85 %29%
March 2026Solids, suspended percent removal, monthly average minimum47.4 %≥ 85 %251%
April 2026Solids, suspended percent removal, monthly average minimum78.2 %≥ 85 %45%

Limits in force (40)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigrademonthly averagereport only (deg C)Jan, Feb, Mar, Apr, Nov, Dec001
Temperature, water deg. centigrademaximum daily averagereport only (deg C)Jan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cmonthly average≤ 69 lb/dJan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cweekly average≤ 103 lb/dJan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec001
pHinstantaneous minimum≥ 6.5 SUJan, Feb, Mar, Apr, Nov, Dec001
pHinstantaneous maximum≤ 9 SUJan, Feb, Mar, Apr, Nov, Dec001
Solids, total suspendedmonthly average≤ 30 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Solids, total suspendedweekly average≤ 45 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Solids, total suspendedmonthly average≤ 69 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Solids, total suspendedweekly average≤ 103 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Solids, total suspendedmonthly averagereport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 14.1 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 19.5 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 32.3 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 44.7 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec001
Phosphorus, total [as P]monthly averagereport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec001
E. coli, MTEC-MFmonthly geometric mean≤ 126 #/100mLJan, Feb, Mar, Apr, Nov, Dec001
E. coli, MTEC-MFdaily maximum≤ 576 #/100mLJan, Feb, Mar, Apr, Nov, Dec001
E. coli, MTEC-MFdaily maximum≤ 406 #/100mL (alert, not enforceable)Jan, Feb, Mar, Apr, Nov, Dec001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)Jan, Feb, Mar, Apr, Nov, Dec001
Flow, in conduit or thru treatment plantmaximum daily averagereport only (MGD)Jan, Feb, Mar, Apr, Nov, Dec001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)Jan, Feb, Mar, Apr, Nov, Dec001
Flow, in conduit or thru treatment plantmaximum daily averagereport only (MGD)Jan, Feb, Mar, Apr, Nov, Dec001
Chlorine, total residualmonthly average≤ .05 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Chlorine, total residualdaily maximum≤ .05 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Chlorine, total residualmonthly average≤ .02 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Chlorine, total residualdaily maximum≤ .04 lb/dJan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %Jan, Feb, Mar, Apr, Nov, Dec001
Solids, suspended percent removalmonthly average minimum≥ 85 %Jan, Feb, Mar, Apr, Nov, Dec001
Temperature, water deg. centigrademonthly averagereport only (deg C)Jan, Feb, Mar, Apr, Nov, DecREC
Temperature, water deg. centigradeinstantaneous maximumreport only (deg C)Jan, Feb, Mar, Apr, Nov, DecREC
Stream flow, instantaneousmonthly averagereport only (cfs)Jan, Feb, Mar, Apr, Nov, DecREC
Stream flow, instantaneousmaximum daily averagereport only (cfs)Jan, Feb, Mar, Apr, Nov, DecREC
pHinstantaneous maximumreport only (SU)Jan, Feb, Mar, Apr, Nov, DecREC
pHinstantaneous minimumreport only (SU)Jan, Feb, Mar, Apr, Nov, DecREC
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)Jan, Feb, Mar, Apr, Nov, DecREC

How strict are these limits?

Cited limits by parameter: Idaho's rules and the federal ones.

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/ID0021849 · MCP: https://passage-data.com/mcp