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Grangeville, City of

Sewage treatment plant, Grangeville, Idaho. NPDES permit ID0020036 expired Apr 30, 2025; its limits still apply. Last 12 months: over a limit 3 times (last December 2025), 5 of 47 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: outfall 001 form M monthly (33 values), outfall REC1 form M monthly (5 values), outfall REC1 form Q quarterly (10 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 5 of 52 reports late

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

Period endingParameterReportedLimitOver by
December 2025E. coli, MTEC-MF, instantaneous maximum1001 #/100mL≤ 576 #/100mL74%
December 2025Solids, suspended percent removal, monthly average minimum65 %≥ 85 %133%
December 2025Solids, total suspended, weekly average368 lb/d≤ 330 lb/d12%

Limits in force (48)

ParameterStatisticLimitMonthsOutfall
Septage discharged to treatment fac.monthly totalreport only (gal)all year001
Oxygen, dissolved [DO]instantaneous minimumreport only (mg/L)all year001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 220 lb/dall year001
BOD, 5-day, 20 deg. Cweekly average≤ 330 lb/dall year001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year001
pHinstantaneous minimum≥ 6.5 SUall year001
pHinstantaneous maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 220 lb/dall year001
Solids, total suspendedweekly average≤ 330 lb/dall year001
Solids, total suspendedmonthly averagereport only (mg/L)all year001
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year001
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, inorganic totalmonthly averagereport only (mg/L)all year001
Nitrogen, inorganic totaldaily maximumreport only (mg/L)all year001
Phosphorus, total [as P]monthly averagereport only (mg/L)all year001
Phosphorus, total [as P]daily maximumreport only (mg/L)all year001
Phosphorus, total [as P]monthly average≤ .49 lb/dJul–Sep001
Phosphorus, total [as P]average≤ .49 lb/dall year001
E. coli, MTEC-MFmonthly geometric mean≤ 126 #/100mLall year001
E. coli, MTEC-MFinstantaneous maximum≤ 576 #/100mLall year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Chlorine, total residualmonthly average≤ .05 mg/Lall year001
Chlorine, total residualdaily maximum≤ .05 mg/Lall year001
Chlorine, total residualmonthly average≤ .37 lb/dall year001
Chlorine, total residualdaily maximum≤ .37 lb/dall year001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
Temperature, water deg. centigrademonthly averagereport only (deg C)all yearREC1
Temperature, water deg. centigradedaily maximumreport only (deg C)all yearREC1
Stream flow, instantaneousmonthly averagereport only (cfs)all yearREC1
Stream flow, instantaneousdaily minimumreport only (cfs)all yearREC1
Oxygen, dissolved [DO]instantaneous minimumreport only (mg/L)all yearREC1
pHinstantaneous minimumreport only (SU)all yearREC1
pHinstantaneous maximumreport only (SU)all yearREC1
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all yearREC1
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all yearREC1
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all yearREC1
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all yearREC1
Nitrogen, inorganic totalmonthly averagereport only (mg/L)all yearREC1
Nitrogen, inorganic totaldaily maximumreport only (mg/L)all yearREC1
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearREC1
Phosphorus, total [as P]daily maximumreport only (mg/L)all yearREC1

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/ID0020036 · MCP: https://passage-data.com/mcp