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Preston, City of

Sewage treatment plant, major discharger, Preston, Idaho. NPDES permit ID0020214 expired Apr 30, 2022; its limits still apply. Last 12 months: over a limit 9 times (last December 2025), 2 of 37 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: outfall 001 form A monthly (26 values), outfall 001 form C monthly (4 values), outfall REC form A monthly (2 values), outfall REC form Q quarterly (4 values), outfall REC form R quarterly (4 values), outfall 001 form S twice a year, and 3 more forms
Last report on file
September 2026
Oct 2024 – Sep 2025
49 values over a limit, 0 required values missing, 0 of 37 reports late

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

Period endingParameterReportedLimitOver by
October 2025Nitrogen, ammonia total [as N], daily maximum7.95 mg/L≤ 4.1 mg/L94%
October 2025Nitrogen, ammonia total [as N], monthly average2.58 mg/L≤ 2 mg/L29%
November 2025Nitrogen, ammonia total [as N], daily maximum8.83 mg/L≤ 4.1 mg/L115%
November 2025Nitrogen, ammonia total [as N], monthly average29.24 lb/d≤ 20.5 lb/d43%
November 2025Nitrogen, ammonia total [as N], monthly average6.77 mg/L≤ 2 mg/L239%
December 2025Nitrogen, ammonia total [as N], daily maximum19.5 mg/L≤ 4.1 mg/L376%
December 2025Nitrogen, ammonia total [as N], daily maximum74.81 lb/d≤ 41.1 lb/d82%
December 2025Nitrogen, ammonia total [as N], monthly average10.63 mg/L≤ 2 mg/L432%
December 2025Nitrogen, ammonia total [as N], monthly average45.49 lb/d≤ 20.5 lb/d122%

Limits in force (77)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigrademaximum weekly averagereport only (deg C)all year001
Temperature, water deg. centigradedaily maximumreport only (deg C)all year001
Conductivitymonthly averagereport only (umho/cm)all year001
Conductivitydaily maximumreport only (umho/cm)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≤ 300 lb/dall year001
BOD, 5-day, 20 deg. Cweekly average≤ 450 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≤ 283 lb/dall year001
Solids, total suspendedweekly average≤ 450 lb/dall year001
Solids, total suspendedmonthly averagereport only (mg/L)all year001
Solids, total suspendedannual average≤ 182 lb/dall year001
Nitrogen, ammonia total [as N]monthly average≤ 2 mg/Lall year001
Nitrogen, ammonia total [as N]daily maximum≤ 4.1 mg/Lall year001
Nitrogen, ammonia total [as N]instantaneous maximumreport only (mg/L)all year001
Nitrogen, ammonia total [as N]monthly average≤ 20.5 lb/dall year001
Nitrogen, ammonia total [as N]daily maximum≤ 41.1 lb/dall year001
Nitrogen, Kjeldahl, total [as N]instantaneous maximumreport only (mg/L)all year001
Nitrite + Nitrate total [as N]instantaneous maximumreport only (mg/L)all year001
Phosphorus, total [as P]monthly averagereport only (mg/L)all year001
Phosphorus, total [as P]maximum weekly averagereport only (mg/L)all year001
Phosphorus, total [as P]instantaneous maximumreport only (ug/L)all year001
Phosphorus, total [as P]monthly average≤ 13.6 lb/dall year001
Phosphorus, total [as P]weekly average≤ 27.3 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
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 recoverabledaily maximumreport only (ug/L)all year001
Nickel, total recoverablemonthly averagereport only (ug/L)all year001
Nickel, total recoverabledaily maximumreport only (ug/L)all year001
Zinc, total recoverablemonthly averagereport only (ug/L)all year001
Zinc, total recoverabledaily maximumreport only (ug/L)all year001
Copper, total recoverablemonthly averagereport only (ug/L)all year001
Copper, total recoverabledaily maximumreport only (ug/L)all year001
Chromium, hexavalent dissolved [as Cr]monthly averagereport only (ug/L)all year001
Chromium, hexavalent dissolved [as Cr]daily maximumreport only (ug/L)all year001
Antimony, total recoverablemonthly averagereport only (ug/L)all year001
Antimony, total recoverabledaily maximumreport only (ug/L)all year001
Oil and greaseinstantaneous maximumreport only (mg/L)all year001
E. coli, MTEC-MFgeometric 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 residualinstantaneous maximumreport only (ug/L)all year001
Solids, total dissolvedinstantaneous maximumreport only (mg/L)all year001
Mercury, total recoverablemonthly averagereport only (ug/L)all year001
Mercury, total recoverabledaily 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, Chronicmaximumreport only (toxic)all year001
Temperature, water deg. centigradeinstantaneous maximumreport only (deg C)all yearREC
Temperature, water deg. centigradeinstantaneous maximumreport only (deg C)all yearREC
Stream flow, instantaneousinstantaneous minimumreport only (MGD)all yearREC
Stream flow, instantaneousminimum weekly averagereport only (MGD)all yearREC
Conductivityinstantaneous maximumreport only (umho/cm)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, ammonia total [as N]instantaneous maximumreport only (mg/L)all yearREC
Nitrogen, ammonia total [as N]instantaneous maximumreport only (mg/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
Nickel, total recoverableinstantaneous maximumreport only (mg/L)all yearREC
Zinc, total recoverableinstantaneous maximumreport only (ug/L)all yearREC
Copper, total recoverableinstantaneous maximumreport only (ug/L)all yearREC
Antimony, total recoverableinstantaneous maximumreport only (ug/L)all yearREC

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/ID0020214 · MCP: https://passage-data.com/mcp