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Ontario, City of

Sewage treatment plant, major discharger, Ontario, Oregon. NPDES permit OR0020621, in force until Jan 31, 2031. Last 12 months: no values over a limit, 2 required values missing, 6 of 21 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (1 value), form G monthly (6 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 18 reports late

Limits in force (40)

ParameterStatisticLimitMonths
Temperature, water deg. centigrademonthly averagereport only (deg C)Jan, Feb, Mar, Apr, Nov, Dec
Temperature, water deg. centigradedaily maximumreport only (deg C)Jan, Feb, Mar, Apr, Nov, Dec
Temperature, water deg. centigrademaximum 7-day averagereport only (deg C)Jan, Feb, Mar, Apr, Nov, Dec
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec
BOD, 5-day, 20 deg. Cmonthly average≤ 770 lb/dJan, Feb, Mar, Apr, Nov, Dec
BOD, 5-day, 20 deg. Cdaily maximum≤ 1500 lb/dJan, Feb, Mar, Apr, Nov, Dec
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 45 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 1100 lb/dJan, Feb, Mar, Apr, Nov, Dec
pHdaily minimum≥ 6 SUJan, Feb, Mar, Apr, Nov, Dec
pHdaily maximum≤ 9 SUJan, Feb, Mar, Apr, Nov, Dec
pHmonthly minimumreport only (SU)all year
pHmonthly maximumreport only (SU)all year
Solids, total suspendedmonthly average≤ 85 mg/LJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendeddaily maximumreport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedmonthly average≤ 2200 lb/dJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendeddaily maximum≤ 4300 lb/dJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedmaximum weekly average≤ 130 mg/LJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedmaximum weekly average≤ 3300 lb/dJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]monthly maximumreport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]monthly maximumreport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec
Arsenic, total recoverablemonthly averagereport only (ug/L)Jan, Feb, Mar, Apr, Nov, Dec
Arsenic, total recoverabledaily maximumreport only (ug/L)Jan, Feb, Mar, Apr, Nov, Dec
Arsenic, Inorganicmonthly maximumreport only (ug/L)Jan, Feb, Mar, Apr, Nov, Dec
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)Jan, Feb, Mar, Apr, Nov, Dec
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)Jan, Feb, Mar, Apr, Nov, Dec
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualmonthly average≤ .05 mg/LJan, Feb, Mar, Apr, Nov, Dec
Chlorine, total residualdaily maximum≤ .05 mg/LJan, Feb, Mar, Apr, Nov, Dec
E. colimonthly geometric mean≤ 126 #/100mLJan, Feb, Mar, Apr, Nov, Dec
E. colidaily maximum≤ 406 #/100mLJan, Feb, Mar, Apr, Nov, Dec
E. colimonthly geometric mean≤ 126 #/100mLJan, Feb, Mar, Apr, Nov, Dec
E. colidaily maximumreport only (#/100mL)Jan, Feb, Mar, Apr, Nov, Dec
Flow, totaldaily maximum≤ 0 galMay–Oct
BOD, 5-day, percent removalmonthly average minimum≥ 85 %Jan, Feb, Mar, Apr, Nov, Dec
Solids, suspended percent removalmonthly average minimum≥ 65 %Jan, Feb, Mar, Apr, Nov, Dec
Chlorine usagemonthly averagereport only (lb/d)Jan, Feb, Mar, Apr, Nov, Dec

How strict are these limits?

Cited limits by parameter: Oregon'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/OR0020621 · MCP: https://passage-data.com/mcp