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Nez Perce Tribe Water Resources Division

Sewage treatment plant, Lapwai, Idaho. NPDES permit ID0028347 expired Oct 31, 2024; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: form A monthly (29 values), form Q quarterly (4 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 16 reports late

Limits in force (33)

ParameterStatisticLimitMonths
Temperature, water deg. centigradedaily averagereport only (deg C)all year
Temperature, water deg. centigradeinstantaneous maximumreport only (deg C)all year
Oxygen, dissolved [DO]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≤ 80 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 120 lb/dall year
pHinstantaneous minimum≥ 6.5 SUall year
pHinstantaneous maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 17 mg/Lall year
Solids, total suspendedweekly averagereport only (mg/L)all year
Solids, total suspendedmonthly average≤ 45 lb/dall year
Solids, total suspendedweekly average≤ 67 lb/dall year
Nitrogen, ammonia total [as N]monthly average≤ 2.9 mg/Lall year
Nitrogen, ammonia total [as N]daily maximum≤ 5.83 mg/Lall year
Nitrogen, ammonia total [as N]monthly average≤ 7.7 lb/dall year
Nitrogen, ammonia total [as N]daily maximum≤ 15.6 lb/dall year
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all year
Nitrite + Nitrate total [as N]monthly average≤ 10 mg/Lall year
Nitrite + Nitrate total [as N]weekly average≤ 15 mg/Lall year
Nitrite + Nitrate total [as N]monthly average≤ 27 lb/dall year
Nitrite + Nitrate total [as N]weekly average≤ 40 lb/dall year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Oil and greasedaily maximumreport only (mg/L)all year
E. coli, MTEC-MFgeometric mean≤ 126 #/100mLall year
E. coli, MTEC-MFinstantaneous maximum≤ 406 #/100mLall year
Floating solids, waste or visible foam-visualinstantaneous maximum≤ 0 N=0;Y=1all 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
Solids, total dissolveddaily maximumreport only (mg/L)all 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/ID0028347 · MCP: https://passage-data.com/mcp