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Bay City, City of

Sewage treatment plant, Bay City, Oregon. NPDES permit OR0022578, in force until Sep 30, 2029. 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 (26 values), form G monthly (6 values), form Q quarterly (3 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 27 reports late

Limits in force (47)

ParameterStatisticLimitMonths
Temperature, water deg. centigrademonthly averagereport only (deg C)all year
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
Temperature, water deg. centigrademaximum 7-day averagereport only (deg C)all year
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, 5-day, 20 deg. Cmonthly average≤ 78 lb/dJan, Feb, Mar, Apr, Nov, Dec
BOD, 5-day, 20 deg. Cdaily maximum≤ 160 lb/dJan, Feb, Mar, Apr, Nov, Dec
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, 5-day, 20 deg. Cweekly average≤ 120 lb/dJan, Feb, Mar, Apr, Nov, Dec
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
pHmonthly minimumreport only (SU)all year
pHmonthly maximumreport only (SU)all year
Alkalinity, total [as CaCO3]quarterly maximumreport only (mg/L)all year
Alkalinity, total [as CaCO3]quarterly maximumreport only (mg/L)all year
Solids, total suspendedmonthly average≤ 30 mg/LJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedmonthly average≤ 20 mg/LMay–Oct
Solids, total suspendedmonthly average≤ 78 lb/dJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedmonthly average≤ 35 lb/dMay–Oct
Solids, total suspendeddaily maximum≤ 160 lb/dJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendeddaily maximum≤ 70 lb/dMay–Oct
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedweekly average≤ 45 mg/LJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedweekly average≤ 30 mg/LMay–Oct
Solids, total suspendedweekly average≤ 120 lb/dJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedweekly average≤ 53 lb/dMay–Oct
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year
Nitrogen, ammonia total [as N]quarterly maximumreport only (mg/L)all year
Coliform, fecal - % samples exceeding limittotal≤ 10 %all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Enterococci - % samples exceeding limittotal≤ 10 %all year
Enterococcimonthly geometric mean≤ 35 #/100mLall year
Enterococcidaily maximumreport only (#/100mL)all year
Coliform, fecal generalmonthly median≤ 42 #/100mLall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 15 mg/LMay–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 26 lb/dMay–Oct
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 52 lb/dMay–Oct
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)May–Oct
BOD, carbonaceous [5 day, 20 C]weekly average≤ 25 mg/LMay–Oct
BOD, carbonaceous [5 day, 20 C]weekly average≤ 39 lb/dMay–Oct
BOD, 5-day, percent removalmonthly average minimum≥ 85 %Jan, Feb, Mar, Apr, Nov, Dec
Solids, suspended percent removalmonthly average minimum≥ 85 %all year
Carbonaceous oxygen demand, % removalmonthly average minimum≥ 85 %May–Oct

New limits from Nov 1, 2028

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Nitrogen, ammonia total [as N], daily maximum12.1 mg/L (May–Oct)new3.6 mg/L (4 values)0.298×
Nitrogen, ammonia total [as N], daily maximum25.9 mg/L (Jan, Feb, Mar, Apr, Nov, Dec)new2.748 mg/L (6 values)0.106×
Nitrogen, ammonia total [as N], monthly average4.1 mg/L (May–Oct)new2.35 mg/L (4 values)0.573×
Nitrogen, ammonia total [as N], monthly average8.8 mg/L (Jan, Feb, Mar, Apr, Nov, Dec)new2.049 mg/L (6 values)0.233×

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/OR0022578 · MCP: https://passage-data.com/mcp