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Philomath, City of

Sewage treatment plant, Philomath, Oregon. NPDES permit OR0032441 expired Jun 30, 2017; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (1 value), form G monthly (5 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 2 of 30 reports late

Limits in force (41)

ParameterStatisticLimitMonths
Temperature, water deg. centigrademonthly averagereport only (deg C)Jan, Feb, Mar, Apr, Nov, Dec
Flow ratedaily maximumreport only (cfs)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. Cmonthly average≤ 460 lb/dJan, Feb, Mar, Apr, Nov, Dec
BOD, 5-day, 20 deg. Cdaily maximum≤ 920 lb/dJan, Feb, Mar, Apr, Nov, Dec
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, 5-day, 20 deg. Cweekly average≤ 690 lb/dJan, Feb, Mar, Apr, Nov, Dec
pHdaily minimum≥ 6.3 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≤ 50 mg/LJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedmonthly average≤ 760 lb/dJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendeddaily maximum≤ 1500 lb/dJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedweekly average≤ 80 mg/LJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedweekly average≤ 1100 lb/dJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec
Flow, in conduit or thru treatment plantdaily maximum≤ 0 MGDJan, Feb, Mar, Apr, Nov, Dec
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximum≤ .25 MGDJan, Feb, Mar, Apr, Nov, Dec
Flow, in conduit or thru treatment plantdaily maximum≤ .53 MGDJan, Feb, Mar, Apr, Nov, Dec
Flow, in conduit or thru treatment plantdaily maximum≤ .95 MGDJan, Feb, Mar, Apr, Nov, Dec
Flow, in conduit or thru treatment plantdaily maximum≤ 1.1 MGDJan, Feb, Mar, Apr, Nov, Dec
Flow, in conduit or thru treatment plantdaily maximum≤ 1.78 MGDJan, Feb, Mar, Apr, Nov, Dec
Flow, in conduit or thru treatment plantdaily maximum≤ 2.38 MGDJan, Feb, Mar, Apr, Nov, Dec
Flow, in conduit or thru treatment plantdaily maximum≤ 2.98 MGDJan, Feb, Mar, Apr, Nov, Dec
Flow, in conduit or thru treatment plantdaily maximum≤ 3.51 MGDJan, Feb, Mar, Apr, Nov, Dec
Flow, in conduit or thru treatment plantdaily maximum≤ 4 MGDJan, Feb, Mar, Apr, Nov, Dec
Chlorine, total residualmonthly average≤ .05 mg/LJan, Feb, Mar, Apr, Nov, Dec
Chlorine, total residualdaily maximum≤ .05 mg/LJan, Feb, Mar, Apr, Nov, Dec
Chlorine, combined availablemonthly averagereport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec
E. colimonthly geometric mean≤ 126 MPN/100mLJan, Feb, Mar, Apr, Nov, Dec
E. colidaily maximum≤ 406 MPN/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≥ 65 %Jan, Feb, Mar, Apr, Nov, Dec
Solids, suspended percent removalmonthly average minimum≥ 55 %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.

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/OR0032441 · MCP: https://passage-data.com/mcp