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Water Environmental Services

Sewage treatment plant, Welches, Oregon. NPDES permit OR0031020, in force until Aug 31, 2027. 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 (33 values), form G monthly (4 values), form Q quarterly (1 value), form RW monthly (3 values)
Renewal application due
Mar 4, 2027 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
4 values over a limit, 0 required values missing, 3 of 40 reports late

Limits in force (57)

ParameterStatisticLimitMonths
Temperature, water deg. centigrademonthly averagereport only (deg C)all year
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
Temperature, water deg. centigrademonthly maximumreport only (deg C)all year
Temperature, water deg. centigrademaximum 7-day averagereport only (deg C)all year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cmonthly average≤ 20 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
BOD, 5-day, 20 deg. Cmonthly average≤ 150 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
BOD, 5-day, 20 deg. Cdaily maximum≤ 300 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
BOD, 5-day, 20 deg. Cmonthly average≤ 20 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
BOD, 5-day, 20 deg. Cmonthly average≤ 150 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
BOD, 5-day, 20 deg. Cdaily maximumreport only (lb/d)Jan, Feb, Mar, Apr, May, Nov, Dec
BOD, 5-day, 20 deg. Cweekly average≤ 30 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
BOD, 5-day, 20 deg. Cweekly average≤ 225 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
pHmonthly maximumreport only (SU)all year
pHmonthly minimumreport only (SU)all year
pHmonthly maximumreport only (SU)all year
Alkalinity, total [as CaCO3]monthly maximumreport only (mg/L)all year
Alkalinity, total [as CaCO3]quarterly maximumreport only (mg/L)all year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedmonthly average≤ 10 mg/LJun–Oct
Solids, total suspendedmonthly average≤ 20 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
Solids, total suspendedmonthly average≤ 75 lb/dJun–Oct
Solids, total suspendedmonthly average≤ 150 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
Solids, total suspendeddaily maximum≤ 150 lb/dJun–Oct
Solids, total suspendeddaily maximum≤ 300 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
Solids, total suspendedmonthly average≤ 20 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
Solids, total suspendedmonthly average≤ 10 mg/LJun–Oct
Solids, total suspendedmonthly average≤ 150 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
Solids, total suspendedmonthly average≤ 75 lb/dJun–Oct
Solids, total suspendeddaily maximumreport only (lb/d)Jan, Feb, Mar, Apr, May, Nov, Dec
Solids, total suspendeddaily maximumreport only (lb/d)Jun–Oct
Solids, total suspendedweekly average≤ 30 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
Solids, total suspendedweekly average≤ 15 mg/LJun–Oct
Solids, total suspendedweekly average≤ 225 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
Solids, total suspendedweekly average≤ 112 lb/dJun–Oct
Nitrogen, ammonia total [as N]monthly maximumreport only (mg/L)Jun–Oct
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/Lall year
Chlorine, total residualdaily maximum≤ .05 mg/Lall year
E. colimonthly geometric mean≤ 126 #/100mLall year
E. colidaily maximum≤ 406 #/100mLall year
E. colimonthly geometric mean≤ 126 #/100mLall year
E. colidaily maximumreport only (#/100mL)all year
Excess thermal loadmaximum 7-day average≤ 29.9 mkcal/dayJun–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/LJun–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 75 lb/dJun–Oct
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 150 lb/dJun–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/LJun–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 75 lb/dJun–Oct
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (lb/d)Jun–Oct
BOD, carbonaceous [5 day, 20 C]weekly average≤ 15 mg/LJun–Oct
BOD, carbonaceous [5 day, 20 C]weekly average≤ 112 lb/dJun–Oct
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year

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/OR0031020 · MCP: https://passage-data.com/mcp