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Nampa, City of

Sewage treatment plant, major discharger, Nampa, Idaho. NPDES permit ID0022063 expired Oct 31, 2021; its limits still apply. Last 12 months: over a limit once (last March 2026), 1 of 112 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: outfall 001 form A monthly (48 values), outfall 001 form B1 monthly (4 values), outfall 001 form B2 monthly (3 values), outfall 001 form C2 monthly (6 values), outfall REC form A1 monthly (2 values), outfall REC form A2 monthly (6 values), and 13 more forms
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 2 required values missing, 8 of 123 reports late

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

Period endingParameterReportedLimitOver by
March 2026Nitrogen, ammonia total [as N], daily maximum6.31 mg/L≤ 4.92 mg/L28%

Limits in force (266)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigrademaximum daily averagereport only (deg C)all year001
Temperature, water deg. centigrademaximum 7-day averagereport only (deg C)all year001
Temperature, water deg. centigradeinstantaneous maximumreport only (deg C)all year001
Conductivitymonthly averagereport only (umho/cm)all year001
Conductivitydaily maximumreport only (umho/cm)all year001
Oxygen, dissolved [DO]instantaneous minimum≥ 6 mg/Lall year001
Oxygen, dissolved percent saturationmonthly average minimum≥ 90 %all year001
Oxygen, dissolved percent saturationminimum weekly average≥ 80 %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≤ 4504 lb/dall year001
BOD, 5-day, 20 deg. Cweekly average≤ 6755 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≤ 4503 lb/dall year001
Solids, total suspendedweekly average≤ 6755 lb/dall year001
Solids, total suspendedmonthly averagereport only (mg/L)all year001
Solids, total suspendedrolling average≤ 17.5 mg/Lall year001
Solids, total suspendedrolling average≤ 2629 lb/dall year001
Nitrogen, ammonia total [as N]monthly average≤ 1.31 mg/LMar–Nov001
Nitrogen, ammonia total [as N]monthly average≤ 1.41 mg/LJan, Feb, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 4.92 mg/LMar–Nov001
Nitrogen, ammonia total [as N]daily maximum≤ 5.31 mg/LJan, Feb, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 197 lb/dMar–Nov001
Nitrogen, ammonia total [as N]monthly average≤ 212 lb/dJan, Feb, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 739 lb/dMar–Nov001
Nitrogen, ammonia total [as N]daily maximum≤ 797 lb/dJan, Feb, Dec001
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, Kjeldahl, total [as N]daily maximumreport 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
Phosphorus, total [as P]monthly average≤ .5 mg/LMay–Sep001
Phosphorus, total [as P]daily maximumreport only (mg/L)May–Sep001
Phosphorus, total [as P]monthly average≤ 75 lb/dMay–Sep001
Phosphorus, total [as P]daily maximumreport only (lb/d)May–Sep001
Phosphorus, total [as P]monthly averagereport only (mg/L)all year001
Phosphorus, total [as P]weekly averagereport only (mg/L)all year001
Phosphorus, total [as P]average≤ 1.5 mg/Lall year001
Phosphorus, total [as P]average≤ 225 lb/dall year001
Carbon, dissolved organic [as C]monthly averagereport only (mg/L)all year001
Carbon, dissolved organic [as C]daily maximumreport only (mg/L)all year001
Cyanide, weak acid, dissociablemonthly average≤ 10 ug/LMar–Nov001
Cyanide, weak acid, dissociablemonthly average≤ 10 ug/LJan, Feb, Dec001
Cyanide, weak acid, dissociablemonthly averagereport only (ug/L)all year001
Cyanide, weak acid, dissociablemonthly averagereport only (ug/L)all year001
Cyanide, weak acid, dissociabledaily maximum≤ 10 ug/LMar–Nov001
Cyanide, weak acid, dissociabledaily maximum≤ 10 ug/LJan, Feb, Dec001
Cyanide, weak acid, dissociableinstantaneous maximumreport only (ug/L)all year001
Cyanide, weak acid, dissociableinstantaneous maximumreport only (ug/L)all year001
Cyanide, weak acid, dissociablemonthly average≤ 1.5 lb/dMar–Nov001
Cyanide, weak acid, dissociablemonthly average≤ 1.5 lb/dJan, Feb, Dec001
Cyanide, weak acid, dissociabledaily maximum≤ 1.5 lb/dMar–Nov001
Cyanide, weak acid, dissociabledaily maximum≤ 1.5 lb/dJan, Feb, Dec001
Hardness, total [as CaCO3]monthly averagereport only (mg/L)all year001
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year001
Arsenic, total recoverablemonthly averagereport only (ug/L)all year001
Arsenic, total recoverablemonthly averagereport only (ug/L)all year001
Arsenic, total recoverableinstantaneous maximumreport only (ug/L)all year001
Arsenic, total recoverableinstantaneous maximumreport only (ug/L)all year001
Arsenic, total recoverablemonthly averagereport only (ug/L)all year001
Arsenic, total recoverablemonthly averagereport only (ug/L)all year001
Arsenic, total recoverableinstantaneous maximumreport only (ug/L)all year001
Arsenic, total recoverableinstantaneous maximumreport only (ug/L)all year001
Selenium, total recoverablemonthly averagereport only (ug/L)all year001
Selenium, total recoverablemonthly averagereport only (ug/L)all year001
Selenium, total recoverableinstantaneous maximumreport only (ug/L)all year001
Selenium, total recoverableinstantaneous maximumreport only (ug/L)all year001
Selenium, total recoverablemonthly averagereport only (ug/L)all year001
Selenium, total recoverablemonthly averagereport only (ug/L)all year001
Selenium, total recoverableinstantaneous maximumreport only (ug/L)all year001
Selenium, total recoverableinstantaneous maximumreport only (ug/L)all year001
Nickel, total recoverablemonthly averagereport only (ug/L)all year001
Nickel, total recoverablemonthly averagereport only (ug/L)all year001
Nickel, total recoverableinstantaneous maximumreport only (ug/L)all year001
Nickel, total recoverableinstantaneous maximumreport only (ug/L)all year001
Nickel, total recoverablemonthly averagereport only (ug/L)all year001
Nickel, total recoverablemonthly averagereport only (ug/L)all year001
Nickel, total recoverableinstantaneous maximumreport only (ug/L)all year001
Nickel, total recoverableinstantaneous maximumreport only (ug/L)all year001
Silver total recoverablemonthly averagereport only (ug/L)all year001
Silver total recoverablemonthly averagereport only (ug/L)all year001
Silver total recoverableinstantaneous maximumreport only (ug/L)all year001
Silver total recoverableinstantaneous maximumreport only (ug/L)all year001
Silver total recoverablemonthly averagereport only (ug/L)all year001
Silver total recoverablemonthly averagereport only (ug/L)all year001
Silver total recoverableinstantaneous maximumreport only (ug/L)all year001
Silver total recoverableinstantaneous maximumreport only (ug/L)all year001
Zinc, total recoverablemonthly averagereport only (ug/L)all year001
Zinc, total recoverablemonthly averagereport only (ug/L)all year001
Zinc, total recoverableinstantaneous maximumreport only (ug/L)all year001
Zinc, total recoverableinstantaneous maximumreport only (ug/L)all year001
Zinc, total recoverablemonthly averagereport only (ug/L)all year001
Zinc, total recoverablemonthly averagereport only (ug/L)all year001
Zinc, total recoverableinstantaneous maximumreport only (ug/L)all year001
Zinc, total recoverableinstantaneous maximumreport only (ug/L)all year001
Cadmium, total recoverablemonthly averagereport only (ug/L)all year001
Cadmium, total recoverablemonthly averagereport only (ug/L)all year001
Cadmium, total recoverableinstantaneous maximumreport only (ug/L)all year001
Cadmium, total recoverableinstantaneous maximumreport only (ug/L)all year001
Cadmium, total recoverablemonthly averagereport only (ug/L)all year001
Cadmium, total recoverablemonthly averagereport only (ug/L)all year001
Cadmium, total recoverableinstantaneous maximumreport only (ug/L)all year001
Cadmium, total recoverableinstantaneous maximumreport only (ug/L)all year001
Lead, total recoverablemonthly averagereport only (ug/L)all year001
Lead, total recoverablemonthly averagereport only (ug/L)all year001
Lead, total recoverableinstantaneous maximumreport only (ug/L)all year001
Lead, total recoverableinstantaneous maximumreport only (ug/L)all year001
Lead, total recoverablemonthly averagereport only (ug/L)all year001
Lead, total recoverablemonthly averagereport only (ug/L)all year001
Lead, total recoverableinstantaneous maximumreport only (ug/L)all year001
Lead, total recoverableinstantaneous maximumreport only (ug/L)all year001
Chromium, total recoverablemonthly averagereport only (ug/L)all year001
Chromium, total recoverablemonthly averagereport only (ug/L)all year001
Chromium, total recoverableinstantaneous maximumreport only (ug/L)all year001
Chromium, total recoverableinstantaneous maximumreport only (ug/L)all year001
Chromium, total recoverablemonthly averagereport only (ug/L)all year001
Chromium, total recoverablemonthly averagereport only (ug/L)all year001
Chromium, total recoverableinstantaneous maximumreport only (ug/L)all year001
Chromium, total recoverableinstantaneous maximumreport only (ug/L)all year001
Copper, total recoverablemonthly averagereport only (ug/L)all year001
Copper, total recoverablemonthly averagereport only (ug/L)all year001
Copper, total recoverableinstantaneous maximumreport only (ug/L)all year001
Copper, total recoverableinstantaneous maximumreport only (ug/L)all year001
Molybdenum, total recoverablemonthly averagereport only (ug/L)all year001
Molybdenum, total recoverablemonthly averagereport only (ug/L)all year001
Molybdenum, total recoverableinstantaneous maximumreport only (ug/L)all year001
Molybdenum, total recoverableinstantaneous maximumreport only (ug/L)all year001
Molybdenum, total recoverablemonthly averagereport only (ug/L)all year001
Molybdenum, total recoverablemonthly averagereport only (ug/L)all year001
Molybdenum, total recoverableinstantaneous maximumreport only (ug/L)all year001
Molybdenum, total recoverableinstantaneous maximumreport only (ug/L)all year001
Chromium, hexavalent dissolved [as Cr]monthly averagereport only (ug/L)all year001
Chromium, hexavalent dissolved [as Cr]monthly averagereport only (ug/L)all year001
Chromium, hexavalent dissolved [as Cr]instantaneous maximumreport only (ug/L)all year001
Chromium, hexavalent dissolved [as Cr]instantaneous maximumreport only (ug/L)all year001
Chromium, hexavalent dissolved [as Cr]monthly averagereport only (ug/L)all year001
Chromium, hexavalent dissolved [as Cr]monthly averagereport only (ug/L)all year001
Chromium, hexavalent dissolved [as Cr]instantaneous maximumreport only (ug/L)all year001
Chromium, hexavalent dissolved [as Cr]instantaneous maximumreport only (ug/L)all year001
Phosphorus [reactive as P]monthly averagereport only (mg/L)all year001
Phosphorus [reactive as P]weekly averagereport only (mg/L)all year001
E. coli, MTEC-MFmonthly geometric mean≤ 126 #/100mLall year001
E. coli, MTEC-MFinstantaneous maximum≤ 576 #/100mLall year001
Floating solids, waste or visible foam-visualmonthly maximum≤ 0 N=0;Y=1all 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
Chlorine, total residualmonthly average≤ 50 ug/LMar–Nov001
Chlorine, total residualmonthly average≤ 50 ug/LJan, Feb, Dec001
Chlorine, total residualdaily maximum≤ 50 ug/LMar–Nov001
Chlorine, total residualdaily maximum≤ 50 ug/LJan, Feb, Dec001
Chlorine, total residualmonthly average≤ 7.5 lb/dMar–Nov001
Chlorine, total residualmonthly average≤ 7.5 lb/dJan, Feb, Dec001
Chlorine, total residualdaily maximum≤ 7.5 lb/dMar–Nov001
Chlorine, total residualdaily maximum≤ 7.5 lb/dJan, Feb, Dec001
Mercury, total [as Hg]monthly averagereport only (ug/L)all year001
Mercury, total [as Hg]daily maximumreport only (ug/L)all year001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
Toxicity, Chronicmonthly averagereport only (toxic)all year001
Toxicity, Chronicmonthly averagereport only (toxic)all year001
Toxicity, Chronicdaily maximumreport only (toxic)all year001
Toxicity, Chronicdaily maximumreport only (toxic)all year001
Temperature, water deg. centigrademonthly averagereport only (deg C)all yearREC
Temperature, water deg. centigradeinstantaneous maximumreport only (deg C)all yearREC
Temperature, water deg. centigrademonthly averagereport only (deg C)all yearREC
Temperature, water deg. centigradeinstantaneous maximumreport only (deg C)all yearREC
Stream flow, instantaneousinstantaneous minimumreport only (cfs)all yearREC
Turbidityinstantaneous maximumreport only (NTU)all yearREC
Turbidityinstantaneous maximumreport only (NTU)all yearREC
Conductivityinstantaneous maximumreport only (umho/cm)all yearREC
Oxygen, dissolved [DO]instantaneous minimumreport only (mg/L)all yearREC
Oxygen, dissolved [DO]averagereport only (mg/L)all yearREC
Oxygen, dissolved [DO]instantaneous minimumreport only (mg/L)all yearREC
Oxygen, dissolved [DO]monthly averagereport only (mg/L)all yearREC
BOD, 5-day, 20 deg. Cinstantaneous maximumreport only (mg/L)all yearREC
pHinstantaneous minimumreport only (SU)all yearREC
pHinstantaneous maximumreport only (SU)all yearREC
pHinstantaneous minimumreport only (SU)all yearREC
pHinstantaneous maximumreport only (SU)all yearREC
Nitrogen, total [as N]instantaneous maximumreport only (mg/L)all yearREC
Nitrogen, total [as N]instantaneous maximumreport only (mg/L)all yearREC
Phosphorus, total [as P]instantaneous maximumreport only (ug/L)all yearREC
Phosphorus, total [as P]instantaneous maximumreport only (ug/L)all yearREC
Carbon, dissolved organic [as C]instantaneous maximumreport only (mg/L)all yearREC
Hardness, total [as CaCO3]instantaneous maximumreport only (mg/L)all yearREC
Arsenic, total recoverableinstantaneous maximumreport only (ug/L)all yearREC
Cadmium, dissolved [as Cd]instantaneous maximumreport only (ug/L)all yearREC
Chromium, dissolved [as Cr]instantaneous maximumreport only (ug/L)all yearREC
Copper, dissolved [as Cu]instantaneous maximumreport only (ug/L)all yearREC
Lead, dissolved [as Pb]instantaneous maximumreport only (ug/L)all yearREC
Nickel, dissolved [as Ni]instantaneous maximumreport only (ug/L)all yearREC
Silver, dissolved [as Ag]instantaneous maximumreport only (ug/L)all yearREC
Zinc, dissolved [as Zn]instantaneous maximumreport only (ug/L)all yearREC
Chromium, hexavalent dissolved [as Cr]instantaneous maximumreport only (ug/L)all yearREC
Chlorophyll Ainstantaneous maximumreport only (ug/L)all yearREC
Chlorophyll Ainstantaneous maximumreport only (ug/L)all yearREC
Mercury, total recoverableinstantaneous maximumreport only (ng/L)all yearREC
Chromium, total dry weight [as Cr]instantaneous maximumreport only (mg/kg)all yearSLS
Chromium, total dry weight [as Cr]instantaneous maximumreport only (mg/kg)all yearSLS
Chromium, total dry weight [as Cr]instantaneous maximumreport only (mg/kg)all yearSLS
Lead, total dry weight [as Pb]instantaneous maximumreport only (mg/kg)all yearSLS
Lead, total dry weight [as Pb]instantaneous maximumreport only (mg/kg)all yearSLS
Lead, total dry weight [as Pb]instantaneous maximumreport only (mg/kg)all yearSLS
Selenium, sludge, total, dry weight [as Se]instantaneous maximumreport only (mg/kg)all yearSLS
Selenium, sludge, total, dry weight [as Se]instantaneous maximumreport only (mg/kg)all yearSLS
Selenium, sludge, total, dry weight [as Se]instantaneous maximumreport only (mg/kg)all yearSLS
Arsenic total, dry weight, sludgeinstantaneous maximumreport only (mg/kg)all yearSLS
Arsenic total, dry weight, sludgeinstantaneous maximumreport only (mg/kg)all yearSLS
Arsenic total, dry weight, sludgeinstantaneous maximumreport only (mg/kg)all yearSLS
Solids, total, sludge, percentinstantaneous maximumreport only (%)all yearSLS
Solids, total, sludge, percentinstantaneous maximumreport only (%)all yearSLS
Solids, total, sludge, percentinstantaneous maximumreport only (%)all yearSLS
Molybdenum, sludge, total, dry weight [as Mo]instantaneous maximumreport only (mg/kg)all yearSLS
Molybdenum, sludge, total, dry weight [as Mo]instantaneous maximumreport only (mg/kg)all yearSLS
Molybdenum, sludge, total, dry weight [as Mo]instantaneous maximumreport only (mg/kg)all yearSLS
Zinc, sludge, total, dry weight [as Zn]instantaneous maximumreport only (mg/kg)all yearSLS
Zinc, sludge, total, dry weight [as Zn]instantaneous maximumreport only (mg/kg)all yearSLS
Zinc, sludge, total, dry weight [as Zn]instantaneous maximumreport only (mg/kg)all yearSLS
Nickel, sludge, total, dry weight [as Ni]instantaneous maximumreport only (mg/kg)all yearSLS
Nickel, sludge, total, dry weight [as Ni]instantaneous maximumreport only (mg/kg)all yearSLS
Nickel, sludge, total, dry weight [as Ni]instantaneous maximumreport only (mg/kg)all yearSLS
Mercury, sludge, total, dry weight [as Hg]instantaneous maximumreport only (mg/L)all yearSLS
Mercury, sludge, total, dry weight [as Hg]instantaneous maximumreport only (mg/kg)all yearSLS
Mercury, sludge, total, dry weight [as Hg]instantaneous maximumreport only (mg/kg)all yearSLS
Copper, sludge, total, dry weight [as Cu]instantaneous maximumreport only (mg/kg)all yearSLS
Copper, sludge, total, dry weight [as Cu]instantaneous maximumreport only (mg/kg)all yearSLS
Copper, sludge, total, dry weight [as Cu]instantaneous maximumreport only (mg/kg)all yearSLS
Cadmium, sludge, total, dry weight [as Cd]instantaneous maximumreport only (mg/kg)all yearSLS
Cadmium, sludge, total, dry weight [as Cd]instantaneous maximumreport only (mg/kg)all yearSLS
Cadmium, sludge, total, dry weight [as Cd]instantaneous maximumreport only (mg/kg)all yearSLS
Chromium, total dry weight [as Cr]instantaneous maximumreport only (mg/kg)all yearSLT
Chromium, total dry weight [as Cr]instantaneous maximumreport only (mg/kg)all yearSLT
Chromium, total dry weight [as Cr]instantaneous maximumreport only (mg/kg)all yearSLT
Lead, total dry weight [as Pb]instantaneous maximumreport only (mg/kg)all yearSLT
Lead, total dry weight [as Pb]instantaneous maximumreport only (mg/kg)all yearSLT
Lead, total dry weight [as Pb]instantaneous maximumreport only (mg/kg)all yearSLT
Selenium, sludge, total, dry weight [as Se]instantaneous maximumreport only (mg/kg)all yearSLT
Selenium, sludge, total, dry weight [as Se]instantaneous maximumreport only (mg/kg)all yearSLT
Selenium, sludge, total, dry weight [as Se]instantaneous maximumreport only (mg/kg)all yearSLT
Arsenic total, dry weight, sludgeinstantaneous maximumreport only (mg/kg)all yearSLT
Arsenic total, dry weight, sludgeinstantaneous maximumreport only (mg/kg)all yearSLT
Arsenic total, dry weight, sludgeinstantaneous maximumreport only (mg/kg)all yearSLT
Solids, total, sludge, percentinstantaneous maximumreport only (%)all yearSLT
Solids, total, sludge, percentinstantaneous maximumreport only (%)all yearSLT
Solids, total, sludge, percentinstantaneous maximumreport only (%)all yearSLT
Molybdenum, sludge, total, dry weight [as Mo]instantaneous maximumreport only (mg/kg)all yearSLT
Molybdenum, sludge, total, dry weight [as Mo]instantaneous maximumreport only (mg/kg)all yearSLT
Molybdenum, sludge, total, dry weight [as Mo]instantaneous maximumreport only (mg/kg)all yearSLT
Zinc, sludge, total, dry weight [as Zn]instantaneous maximumreport only (mg/kg)all yearSLT
Zinc, sludge, total, dry weight [as Zn]instantaneous maximumreport only (mg/kg)all yearSLT
Zinc, sludge, total, dry weight [as Zn]instantaneous maximumreport only (mg/kg)all yearSLT
Nickel, sludge, total, dry weight [as Ni]instantaneous maximumreport only (mg/kg)all yearSLT
Nickel, sludge, total, dry weight [as Ni]instantaneous maximumreport only (mg/kg)all yearSLT
Nickel, sludge, total, dry weight [as Ni]instantaneous maximumreport only (mg/kg)all yearSLT
Mercury, sludge, total, dry weight [as Hg]instantaneous maximumreport only (mg/kg)all yearSLT
Mercury, sludge, total, dry weight [as Hg]instantaneous maximumreport only (mg/kg)all yearSLT
Mercury, sludge, total, dry weight [as Hg]instantaneous maximumreport only (mg/kg)all yearSLT
Copper, sludge, total, dry weight [as Cu]instantaneous maximumreport only (mg/kg)all yearSLT
Copper, sludge, total, dry weight [as Cu]instantaneous maximumreport only (mg/kg)all yearSLT
Copper, sludge, total, dry weight [as Cu]instantaneous maximumreport only (mg/kg)all yearSLT
Cadmium, sludge, total, dry weight [as Cd]instantaneous maximumreport only (mg/kg)all yearSLT
Cadmium, sludge, total, dry weight [as Cd]instantaneous maximumreport only (mg/kg)all yearSLT
Cadmium, sludge, total, dry weight [as Cd]instantaneous maximumreport only (mg/kg)all yearSLT

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/ID0022063 · MCP: https://passage-data.com/mcp