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Water Environment Services

Sewage treatment plant, Boring, Oregon. NPDES permit OR0031399 expired Feb 28, 2021; its limits still apply. Last 12 months: no values over a limit, 1 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (34 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 1 of 12 reports late

Limits in force (46)

ParameterStatisticLimitMonths
Temperature, water deg. centigrademonthly averagereport only (deg C)all year
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
Temperature, water deg. centigradehighest 7-day averagereport only (deg C)all year
BOD, 5-day, 20 deg. Cmonthly average≤ 20 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, 5-day, 20 deg. Cmonthly average≤ 3.4 lb/dJan, Feb, Mar, Apr, Nov, Dec
BOD, 5-day, 20 deg. Cdaily maximum≤ 6.8 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≤ 30 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, 5-day, 20 deg. Cweekly average≤ 5 lb/dJan, Feb, Mar, Apr, Nov, Dec
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
pHdaily minimumreport only (SU)all year
pHdaily maximumreport only (SU)all year
Solids, total suspendedmonthly average≤ 10 mg/LMay–Oct
Solids, total suspendedmonthly average≤ 20 mg/LJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedmonthly average≤ 1.7 lb/dMay–Oct
Solids, total suspendedmonthly average≤ 3.4 lb/dJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendeddaily maximum≤ 3.4 lb/dMay–Oct
Solids, total suspendeddaily maximum≤ 6.8 lb/dJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedweekly average≤ 30 mg/LJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedweekly average≤ 15 mg/LMay–Oct
Solids, total suspendedweekly average≤ 5 lb/dJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedweekly average≤ 2.5 lb/dMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 5 mg/Lall year
Nitrogen, ammonia total [as N]daily maximum≤ 11.5 mg/Lall 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
Chlorine, total residualmonthly average≤ .1 mg/Lall year
Chlorine, total residualdaily maximum≤ .1 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 loaddaily maximum≤ .333 mkcal/dayJun–Oct
Excess thermal loaddaily maximum≤ .357 mkcal/dayJan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/LMay–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 1.7 lb/dMay–Oct
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 3.4 lb/dMay–Oct
BOD, carbonaceous [5 day, 20 C]weekly average≤ 15 mg/LMay–Oct
BOD, carbonaceous [5 day, 20 C]weekly average≤ 2.5 lb/dMay–Oct
BOD, carbonaceous, percent removalmonthly average minimum≥ 85 %May–Oct
BOD, 5-day, percent removalmonthly average minimum≥ 85 %Jan, Feb, Mar, Apr, Nov, Dec
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.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/OR0031399 · MCP: https://passage-data.com/mcp