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Hermiston, City of

Sewage treatment plant, major discharger, Hermiston, Oregon. NPDES permit OR0020761, in force until Jan 31, 2028. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (33 values), outfall 001 form G monthly (6 values), outfall 001 form RW monthly (4 values), outfall 002 form A monthly (28 values), outfall 003 form A monthly (32 values)
Renewal application due
Aug 4, 2027 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 67 reports late

Limits in force (133)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigrademonthly averagereport only (deg C)all year001
Temperature, water deg. centigradedaily maximumreport only (deg C)all year001
Temperature, water deg. centigrademonthly maximumreport only (deg C)all year001
Temperature, water deg. centigrademaximum 7-day averagereport only (deg C)all year001
Flow ratemonthly maximumreport only (cfs)all year001
BOD, 5-day, 20 deg. Cmonthly average≤ 20 mg/LMay–Oct001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cmonthly average≤ 490 lb/dMay–Oct001
BOD, 5-day, 20 deg. Cmonthly average≤ 740 lb/dJan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cdaily maximum≤ 980 lb/dMay–Oct001
BOD, 5-day, 20 deg. Cdaily maximum≤ 1500 lb/dJan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year001
BOD, 5-day, 20 deg. Cweekly average≤ 30 mg/LMay–Oct001
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cweekly average≤ 740 lb/dMay–Oct001
BOD, 5-day, 20 deg. Cweekly average≤ 1100 lb/dJan, Feb, Mar, Apr, Nov, Dec001
pHdaily minimum≥ 6.1 SUall year001
pHdaily maximum≤ 9 SUall year001
pHmonthly minimumreport only (SU)all year001
pHmonthly maximumreport only (SU)all year001
pHmonthly maximumreport only (SU)all year001
Alkalinity, total [as CaCO3]monthly maximumreport only (mg/L)all year001
Alkalinity, total [as CaCO3]monthly maximumreport only (mg/L)all year001
Solids, total suspendedmonthly average≤ 30 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Solids, total suspendedmonthly average≤ 20 mg/LMay–Oct001
Solids, total suspendedmonthly average≤ 740 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Solids, total suspendedmonthly average≤ 490 lb/dMay–Oct001
Solids, total suspendeddaily maximum≤ 1500 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Solids, total suspendeddaily maximum≤ 980 lb/dMay–Oct001
Solids, total suspendedmonthly averagereport only (mg/L)all year001
Solids, total suspendedmonthly average≤ 45 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Solids, total suspendedweekly average≤ 30 mg/LMay–Oct001
Solids, total suspendedmonthly average≤ 1100 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Solids, total suspendedweekly average≤ 740 lb/dMay–Oct001
Nitrogen, ammonia total [as N]monthly average≤ 94 mg/LMay–Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 130 mg/LMay–Oct001
Hardness, total [as CaCO3]monthly maximumreport only (mg/L)all year001
Dichlorobromomethanemonthly averagereport only (ug/L)all year001
Dichlorobromomethanedaily maximumreport only (ug/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 average≤ .05 mg/Lall year001
Chlorine, total residualdaily maximum≤ .05 mg/Lall 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
Excess thermal loadmaximum 7-day average≤ 11.9 mkcal/dayMay–Oct001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
Chlorine usagemonthly averagereport only (lb/d)all year001
Temperature, water deg. centigrademonthly averagereport only (deg C)all year002
Temperature, water deg. centigradedaily maximumreport only (deg C)all year002
Temperature, water deg. centigrademaximum 7-day averagereport only (deg C)all year002
BOD, 5-day, 20 deg. Cmonthly average≤ 20 mg/LMay–Oct002
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/LJan, Feb, Mar, Apr, Nov, Dec002
BOD, 5-day, 20 deg. Cmonthly average≤ 490 lb/dMay–Oct002
BOD, 5-day, 20 deg. Cmonthly average≤ 740 lb/dJan, Feb, Mar, Apr, Nov, Dec002
BOD, 5-day, 20 deg. Cdaily maximum≤ 980 lb/dMay–Oct002
BOD, 5-day, 20 deg. Cdaily maximum≤ 1500 lb/dJan, Feb, Mar, Apr, Nov, Dec002
BOD, 5-day, 20 deg. Cweekly average≤ 30 mg/LMay–Oct002
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/LJan, Feb, Mar, Apr, Nov, Dec002
BOD, 5-day, 20 deg. Cweekly average≤ 740 lb/dMay–Oct002
BOD, 5-day, 20 deg. Cweekly average≤ 1100 lb/dJan, Feb, Mar, Apr, Nov, Dec002
pHdaily minimum≥ 6.1 SUall year002
pHdaily maximum≤ 9 SUall year002
Alkalinity, total [as CaCO3]monthly maximumreport only (mg/L)all year002
Solids, total suspendedmonthly average≤ 20 mg/LMay–Oct002
Solids, total suspendedmonthly average≤ 30 mg/LJan, Feb, Mar, Apr, Nov, Dec002
Solids, total suspendedmonthly average≤ 490 lb/dMay–Oct002
Solids, total suspendedmonthly average≤ 740 lb/dJan, Feb, Mar, Apr, Nov, Dec002
Solids, total suspendeddaily maximum≤ 980 lb/dMay–Oct002
Solids, total suspendeddaily maximum≤ 1500 lb/dJan, Feb, Mar, Apr, Nov, Dec002
Solids, total suspendedweekly average≤ 30 mg/LMay–Oct002
Solids, total suspendedweekly average≤ 45 mg/LJan, Feb, Mar, Apr, Nov, Dec002
Solids, total suspendedweekly average≤ 740 lb/dMay–Oct002
Solids, total suspendedweekly average≤ 1100 lb/dJan, Feb, Mar, Apr, Nov, Dec002
Nitrogen, ammonia total [as N]monthly maximumreport only (mg/L)May–Oct002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
Chlorine, total residualmonthly averagereport only (mg/L)all year002
Chlorine, total residualdaily maximumreport only (mg/L)all year002
E. colimonthly geometric mean≤ 126 #/100mLall year002
E. colidaily maximum≤ 406 #/100mLall year002
E. colimonthly geometric mean≤ 126 #/100mLall year002
E. colidaily maximumreport only (#/100mL)all year002
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year002
Solids, suspended percent removalmonthly average minimum≥ 85 %all year002
Chlorine usagemonthly averagereport only (lb/d)all year002
Temperature, water deg. centigrademonthly averagereport only (deg C)all year003
Temperature, water deg. centigradedaily maximumreport only (deg C)all year003
Temperature, water deg. centigrademaximum 7-day averagereport only (deg C)all year003
BOD, 5-day, 20 deg. Cmonthly average≤ 20 mg/LMay–Oct003
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/LJan, Feb, Mar, Apr, Nov, Dec003
BOD, 5-day, 20 deg. Cmonthly average≤ 490 lb/dMay–Oct003
BOD, 5-day, 20 deg. Cmonthly average≤ 740 lb/dJan, Feb, Mar, Apr, Nov, Dec003
BOD, 5-day, 20 deg. Cdaily maximum≤ 980 lb/dMay–Oct003
BOD, 5-day, 20 deg. Cdaily maximum≤ 1500 lb/dJan, Feb, Mar, Apr, Nov, Dec003
BOD, 5-day, 20 deg. Cweekly average≤ 30 mg/LMay–Oct003
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/LJan, Feb, Mar, Apr, Nov, Dec003
BOD, 5-day, 20 deg. Cweekly average≤ 740 lb/dMay–Oct003
BOD, 5-day, 20 deg. Cweekly average≤ 1100 lb/dJan, Feb, Mar, Apr, Nov, Dec003
pHmonthly minimum≥ 6.1 SUall year003
pHmonthly maximum≤ 9 SUall year003
Alkalinity, total [as CaCO3]monthly maximumreport only (mg/L)all year003
Solids, total suspendedmonthly average≤ 20 mg/LMay–Oct003
Solids, total suspendedmonthly average≤ 30 mg/LJan, Feb, Mar, Apr, Nov, Dec003
Solids, total suspendedmonthly average≤ 490 lb/dMay–Oct003
Solids, total suspendedmonthly average≤ 740 lb/dJan, Feb, Mar, Apr, Nov, Dec003
Solids, total suspendeddaily maximum≤ 980 lb/dMay–Oct003
Solids, total suspendeddaily maximum≤ 1500 lb/dJan, Feb, Mar, Apr, Nov, Dec003
Solids, total suspendedweekly average≤ 30 mg/LMay–Oct003
Solids, total suspendedweekly average≤ 45 mg/LJan, Feb, Mar, Apr, Nov, Dec003
Solids, total suspendedweekly average≤ 740 lb/dMay–Oct003
Solids, total suspendedweekly average≤ 1100 lb/dJan, Feb, Mar, Apr, Nov, Dec003
Nitrogen, ammonia total [as N]monthly average≤ 94 mg/LMay–Oct003
Nitrogen, ammonia total [as N]daily maximum≤ 130 mg/LMay–Oct003
Hardness, total [as CaCO3]monthly maximumreport only (mg/L)all year003
Dichlorobromomethanemonthly averagereport only (ug/L)all year003
Dichlorobromomethanedaily maximumreport only (ug/L)all year003
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year003
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year003
Chlorine, total residualmonthly average≤ .05 mg/Lall year003
Chlorine, total residualdaily maximum≤ .05 mg/Lall year003
E. colimonthly geometric mean≤ 126 #/100mLall year003
E. colidaily maximum≤ 406 #/100mLall year003
E. colimonthly geometric mean≤ 126 #/100mLall year003
E. colidaily maximumreport only (#/100mL)all year003
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year003
Solids, suspended percent removalmonthly average minimum≥ 85 %all year003
Chlorine usagemonthly averagereport only (lb/d)all year003

How strict are these limits?

Cited limits by parameter: Oregon'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/OR0020761 · MCP: https://passage-data.com/mcp