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Rexburg, City of

Sewage treatment plant, major discharger, Rexburg, Idaho. NPDES permit ID0023817, in force until Mar 31, 2028. Last 12 months: over a limit 21 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: outfall 001 form M monthly (37 values), outfall REC form 1 monthly (11 values)
Renewal application due
Oct 3, 2027 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
2 values over a limit, 0 required values missing, 0 of 24 reports late

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

All 21 values over a limit
Period endingParameterReportedLimitOver by
October 2025Solids, suspended percent removal, monthly average minimum78 %≥ 85 %47%
October 2025Solids, total suspended, monthly average1328.84 lb/d≤ 901 lb/d47%
October 2025Solids, total suspended, monthly average69.5 mg/L≤ 30 mg/L132%
October 2025Solids, total suspended, weekly average1584.6 lb/d≤ 1350 lb/d17%
October 2025Solids, total suspended, weekly average95 mg/L≤ 45 mg/L111%
November 2025Solids, suspended percent removal, monthly average minimum84 %≥ 85 %7%
November 2025Solids, total suspended, monthly average103.2 mg/L≤ 30 mg/L244%
November 2025Solids, total suspended, monthly average1721.38 lb/d≤ 901 lb/d91%
November 2025Solids, total suspended, weekly average251 mg/L≤ 45 mg/L458%
November 2025Solids, total suspended, weekly average4186.68 lb/d≤ 1350 lb/d210%
December 2025Solids, total suspended, monthly average59.33 mg/L≤ 30 mg/L98%
December 2025Solids, total suspended, monthly average989.68 lb/d≤ 901 lb/d10%
December 2025Solids, total suspended, weekly average242 mg/L≤ 45 mg/L438%
December 2025Solids, total suspended, weekly average4036.56 lb/d≤ 1350 lb/d199%
January 2026Solids, total suspended, monthly average1816.45 lb/d≤ 901 lb/d102%
January 2026Solids, total suspended, monthly average84.17 mg/L≤ 30 mg/L181%
January 2026Solids, total suspended, weekly average223 mg/L≤ 45 mg/L396%
January 2026Solids, total suspended, weekly average3719.64 lb/d≤ 1350 lb/d176%
March 2026BOD, 5-day, 20 deg. C, monthly average1246.81 lb/d≤ 901 lb/d38%
March 2026BOD, 5-day, 20 deg. C, monthly average37.75 mg/L≤ 30 mg/L26%
June 2026Solids, total suspended, monthly average35.4 mg/L≤ 30 mg/L18%

Limits in force (54)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigrademonthly averagereport only (deg C)all year001
Temperature, water deg. centigrademaximum daily averagereport only (deg C)all year001
Septage discharged to treatment fac.monthly totalreport only (gal)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≤ 901 lb/dall year001
BOD, 5-day, 20 deg. Cweekly average≤ 1350 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≤ 901 lb/dall year001
Solids, total suspendedweekly average≤ 1350 lb/dall year001
Solids, total suspendedmonthly averagereport only (mg/L)all year001
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year001
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year001
Phosphorus, total [as P]monthly averagereport only (mg/L)all year001
Hardness, total [as CaCO3]monthly averagereport only (mg/L)all year001
Silver total recoverablemonthly averagereport only (ug/L)all year001
Silver 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
Lead, total recoverablemonthly averagereport only (ug/L)all year001
Lead, 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
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantmaximum daily averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantmaximum daily averagereport only (MGD)all year001
E. colimonthly geometric mean≤ 126 #/100mLall year001
E. coliinstantaneous maximum≤ 410 #/100mLall year001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
Temperature, water deg. centigradedaily maximumreport only (deg C)all yearREC
Temperature, water deg. centigrademaximum daily averagereport only (deg C)all yearREC
Temperature, water deg. centigrademonthly averagereport only (deg C)all yearREC
Temperature, water deg. centigradedaily maximumreport only (deg C)all yearREC
Streamflowmonthly averagereport only (cfs)all yearREC
Streamflowmaximum daily averagereport only (cfs)all yearREC
pHinstantaneous minimumreport only (SU)all yearREC
pHinstantaneous maximumreport only (SU)all yearREC
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all yearREC
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)Jan, Apr, Jul, OctREC
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)Jan, Apr, Jul, OctREC
Phosphorus, total [as P]daily maximumreport only (mg/L)Jan, Apr, Jul, OctREC
Hardness, total [as CaCO3]daily maximumreport only (mg/L)Jan, Apr, Jul, OctREC
Copper, dissolved [as Cu]daily maximumreport only (ug/L)all yearREC
Lead, dissolved [as Pb]daily maximumreport only (ug/L)Jan, Apr, Jul, OctREC
Silver, dissolved [as Ag]daily maximumreport only (ug/L)Jan, Apr, Jul, OctREC
Zinc, dissolved [as Zn]daily 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/ID0023817 · MCP: https://passage-data.com/mcp