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Black Butte Ranch Corporation

Sewerage Systems, Sisters, Oregon. NPDES permit OR0034037 expired Apr 30, 2026; its limits still apply. Last 12 months: no values over a limit, 22 required values missing, 1 of 31 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 16 days after each period: form A monthly (1 value), form G monthly (6 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
1 value over a limit, 83 required values missing, 7 of 32 reports late

Limits in force (38)

ParameterStatisticLimitMonths
Temperature, water deg. centigradedaily maximumreport only (deg C)Jan, Feb, Mar, Apr, May, Nov, Dec
Temperature, water deg. centigrademonthly maximumreport only (deg C)Jan, Feb, Mar, Apr, May, Nov, Dec
Temperature, water deg. centigrademaximum 7-day averagereport only (deg C)Jan, Feb, Mar, Apr, May, Nov, Dec
Flow ratemonthly minimumreport only (cfs)Jan, Feb, Mar, Apr, May, Nov, Dec
Flow ratemonthly maximumreport only (cfs)Jan, Feb, Mar, Apr, May, Nov, Dec
BOD, 5-day, 20 deg. Cmonthly average≤ 15 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
BOD, 5-day, 20 deg. Cmonthly average≤ 23 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
BOD, 5-day, 20 deg. Cdaily maximum≤ 46 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cweekly average≤ 20 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
BOD, 5-day, 20 deg. Cweekly average≤ 34 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
pHdaily minimum≥ 6 SUJan, Feb, Mar, Apr, May, Nov, Dec
pHdaily maximum≤ 9 SUJan, Feb, Mar, Apr, May, Nov, Dec
pHmonthly minimumreport only (SU)all year
pHmonthly maximumreport only (SU)all year
pHmonthly minimumreport only (SU)Jan, Feb, Mar, Apr, May, Nov, Dec
pHmonthly maximumreport only (SU)Jan, Feb, Mar, Apr, May, Nov, Dec
Solids, total suspendedmonthly average≤ 15 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
Solids, total suspendedmonthly average≤ 23 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
Solids, total suspendeddaily maximum≤ 46 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedweekly average≤ 20 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
Solids, total suspendedweekly average≤ 34 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 7 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 14 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)Jan, Feb, Mar, Apr, May, Nov, Dec
Flow, in conduit or thru treatment plantdaily maximum≤ 0 MGDJun–Oct
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)Jan, Feb, Mar, Apr, May, 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, May, Nov, Dec
Chlorine, total residualdaily maximum≤ .05 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
E. colimonthly geometric mean≤ 126 #/100mLJan, Feb, Mar, Apr, May, Nov, Dec
E. colidaily maximum≤ 406 #/100mLJan, Feb, Mar, Apr, May, Nov, Dec
E. colimonthly geometric mean≤ 126 #/100mLJan, Feb, Mar, Apr, May, Nov, Dec
E. colidaily maximumreport only (#/100mL)Jan, Feb, Mar, Apr, May, Nov, Dec
BOD, 5-day, percent removalmonthly average minimum≥ 85 %Jan, Feb, Mar, Apr, May, Nov, Dec
Solids, suspended percent removalmonthly average minimum≥ 85 %Jan, Feb, Mar, Apr, May, 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/OR0034037 · MCP: https://passage-data.com/mcp