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Sewage treatment plant, major discharger, Hillsboro, Oregon. NPDES permit OR0023345, in force until Nov 30, 2027. Last 12 months: no values over a limit, 1 of 30 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (18 values), form G monthly (7 values)
Renewal application due
Jun 3, 2027 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 2 required values missing, 1 of 39 reports late

Limits in force (55)

ParameterStatisticLimitMonths
Temperature, water deg. centigrademonthly averagereport only (deg C)May–Oct
Temperature, water deg. centigradedaily maximumreport only (deg C)May–Oct
Temperature, water deg. centigrademaximum 7-day averagereport only (deg C)May–Oct
pHdaily minimum≥ 6.3 SUall year
pHdaily maximum≤ 9 SUall year
pHmonthly minimumreport only (SU)all year
pHmonthly maximumreport only (SU)all year
Solids, total suspendedmonthly average≤ 20 mg/LJan, Feb, Mar, Apr, Dec
Solids, total suspendedmonthly average≤ 2000 lb/dJan, Feb, Mar, Apr, Dec
Solids, total suspendeddaily maximumreport only (lb/d)Jan, Feb, Mar, Apr, Dec
Solids, total suspendedmonthly averagereport only (mg/L)May–Oct
Solids, total suspendedmonthly averagereport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedmonthly average≤ 20 mg/LMay, Jun, Oct, Nov
Solids, total suspendedmonthly average≤ 2000 lb/dMay, Jun, Oct, Nov
Solids, total suspendeddaily maximumreport only (lb/d)May, Jun, Oct, Nov
Solids, total suspendedweekly average≤ 30 mg/LMay, Jun, Oct, Nov
Solids, total suspendedweekly average≤ 3000 lb/dMay, Jun, Oct, Nov
Solids, total suspendedweekly average≤ 30 mg/LJan, Feb, Mar, Apr, Dec
Solids, total suspendedweekly average≤ 3000 lb/dJan, Feb, Mar, Apr, Dec
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)May–Oct
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)May–Oct
Nitrogen, ammonia total [as N]monthly maximumreport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 17.4 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 50.4 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all year
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantmaximum daily averagereport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantmaximum daily averagereport only (MGD)all 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
Ultraviolet light dosagedaily minimumreport only (mJ/cm2)all year
Ultraviolet light dosagemonthly averagereport only (mJ/cm2)all year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 15 mg/LJan, Feb, Mar, Apr, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 1000 lb/dJan, Feb, Mar, Apr, Dec
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 2000 lb/dJan, Feb, Mar, Apr, Dec
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)May–Oct
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 15 mg/LMay, Jun, Oct, Nov
BOD, carbonaceous [5 day, 20 C]monthly average≤ 1000 lb/dMay, Jun, Oct, Nov
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 2000 lb/dMay, Jun, Oct, Nov
BOD, carbonaceous [5 day, 20 C]weekly average≤ 25 mg/LMay, Jun, Oct, Nov
BOD, carbonaceous [5 day, 20 C]weekly average≤ 1500 lb/dMay, Jun, Oct, Nov
BOD, carbonaceous [5 day, 20 C]weekly average≤ 25 mg/LJan, Feb, Mar, Apr, Dec
BOD, carbonaceous [5 day, 20 C]weekly average≤ 1500 lb/dJan, Feb, Mar, Apr, Dec
BOD, carbonaceous, percent removalmonthly average minimum≥ 85 %Jan, Feb, Mar, Apr, Dec
BOD, carbonaceous, percent removalmonthly average minimum≥ 85 %May, Jun, Oct, Nov
Solids, suspended percent removalmonthly average minimum≥ 85 %Jan, Feb, Mar, Apr, Dec
Solids, suspended percent removalmonthly average minimum≥ 85 %May, Jun, Oct, Nov

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/OR0023345 · MCP: https://passage-data.com/mcp