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City of St. Helens

Sewerage Systems, major discharger, St Helens, Oregon. NPDES permit OR0020834, in force until Sep 30, 2029. Last 12 months: over a limit 6 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 45 days after each period: outfall 001 form A monthly (29 values), outfall 001 form G monthly (6 values), outfall 007 form A monthly (29 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
2 values over a limit, 54 required values missing, 8 of 40 reports late

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

Period endingParameterReportedLimitOver by
October 2025BOD, 5-day, 20 deg. C, monthly average54.4 mg/L≤ 45 mg/L21%
November 2025BOD, 5-day, 20 deg. C, monthly average50 mg/L≤ 45 mg/L11%
July 2026BOD, 5-day, 20 deg. C, monthly average68.7 mg/L≤ 45 mg/L53%
July 2026BOD, 5-day, 20 deg. C, weekly average69.3 mg/L≤ 65 mg/L7%
August 2026BOD, 5-day, 20 deg. C, monthly average49.8 mg/L≤ 45 mg/L11%
August 2026BOD, 5-day, 20 deg. C, weekly average66.7 mg/L≤ 65 mg/L3%

Limits in force (64)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigrademonthly averagereport only (deg C)all year001
Temperature, water deg. centigradedaily maximumreport only (deg C)all year001
Temperature, water deg. centigrademaximum 7-day averagereport only (deg C)all year001
Thermal Dischargemonthly average≤ 1370 mkcal/dayJun–Sep001
BOD, 5-day, 20 deg. Cmonthly average≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 3500 lb/dall year001
BOD, 5-day, 20 deg. Cdaily maximum≤ 7000 lb/dall year001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year001
BOD, 5-day, 20 deg. Cweekly average≤ 65 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 5300 lb/dall year001
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
pHmonthly minimumreport only (SU)all year001
pHmonthly maximumreport only (SU)all year001
Solids, total suspendedmonthly average≤ 50 mg/Lall year001
Solids, total suspendedmonthly average≤ 3900 lb/dall year001
Solids, total suspendeddaily maximum≤ 7800 lb/dall year001
Solids, total suspendedmonthly averagereport only (mg/L)all year001
Solids, total suspendedweekly average≤ 75 mg/Lall year001
Solids, total suspendedweekly average≤ 5900 lb/dall year001
Nitrogen, ammonia total [as N]monthly maximumreport only (mg/L)all 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
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Chlorine, total residualmonthly averagereport only (mg/L)all year001
Chlorine, total residualdaily maximumreport only (mg/L)all year001
E. colimonthly geometric mean≤ 126 #/100mLall year001
E. colidaily maximum≤ 406 #/100mLall year001
E. colimonthly geometric mean≤ 126 #/100mLall year001
E. colidaily maximumreport only (#/100mL)all year001
BOD, 5-day, percent removalmonthly average minimum≥ 65 %all year001
Solids, suspended percent removalmonthly average minimum≥ 65 %all year001
Chlorine usagemonthly averagereport only (lb/d)all year001
Chlorine usagedaily maximumreport only (lb/d)all year001
Temperature, water deg. centigrademonthly averagereport only (deg C)all year007
Temperature, water deg. centigradedaily maximumreport only (deg C)all year007
Temperature, water deg. centigrademaximum 7-day averagereport only (deg C)all year007
Thermal Dischargemonthly average≤ 1370 mkcal/dayJun–Sep007
BOD, 5-day, 20 deg. Cmonthly average≤ 45 mg/Lall year007
BOD, 5-day, 20 deg. Cmonthly average≤ 3500 lb/dall year007
BOD, 5-day, 20 deg. Cdaily maximum≤ 7000 lb/dall year007
BOD, 5-day, 20 deg. Cweekly average≤ 65 mg/Lall year007
BOD, 5-day, 20 deg. Cweekly average≤ 5300 lb/dall year007
pHdaily minimum≥ 6 SUall year007
pHdaily maximum≤ 9 SUall year007
Solids, total suspendedmonthly average≤ 50 mg/Lall year007
Solids, total suspendedmonthly average≤ 3900 lb/dall year007
Solids, total suspendeddaily maximum≤ 7800 lb/dall year007
Solids, total suspendedweekly average≤ 75 mg/Lall year007
Solids, total suspendedweekly average≤ 5900 lb/dall year007
Nitrogen, ammonia total [as N]monthly maximumreport only (mg/L)all year007
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year007
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year007
Chlorine, total residualmonthly averagereport only (mg/L)all year007
Chlorine, total residualdaily maximumreport only (mg/L)all year007
E. colimonthly geometric mean≤ 126 #/100mLall year007
E. colidaily maximum≤ 406 #/100mLall year007
E. colimonthly geometric mean≤ 126 #/100mLall year007
E. colidaily maximumreport only (#/100mL)all year007
BOD, 5-day, percent removalmonthly average minimum≥ 65 %all year007
Solids, suspended percent removalmonthly average minimum≥ 65 %all year007
Chlorine usagemonthly averagereport only (lb/d)all year007
Chlorine usagedaily maximumreport only (lb/d)all year007

How strict are these limits?

Cited limits by parameter: Oregon's rules and the federal ones.

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Your permit document is the final word. As JSON: /api/v1/permits/OR0020834 · MCP: https://passage-data.com/mcp