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Clean Water Services

Sewage treatment plant, major discharger, Tigard, Oregon. NPDES permit OR0028118, in force until Nov 30, 2027. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (43 values), outfall 001 form G monthly (8 values), outfall 001 form T monthly (6 values), outfall 003 form A monthly (21 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, 4 required values missing, 2 of 60 reports late

Limits in force (139)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigrademonthly averagereport only (deg C)May–Oct001
Temperature, water deg. centigradedaily maximum≤ 25 deg CMay–Oct001
Temperature, water deg. centigradehighest 7-day averagereport only (deg C)May–Oct001
Flow ratemonthly averagereport only (cfs)all year001
Flow ratedaily maximumreport only (cfs)all year001
Oxygen, dissolved [DO]daily average minimum≥ 5.2 mg/LMay–Oct001
Solids, total suspendedmonthly average≤ 5 mg/LJul–Sep001
Solids, total suspendedmonthly average≤ 10 mg/LJan, Feb, Mar, Apr, Dec001
Solids, total suspendedmonthly average≤ 6400 lb/dJul–Sep001
Solids, total suspendedmonthly average≤ 11000 lb/dJan, Feb, Mar, Apr, Dec001
Solids, total suspendeddaily maximumreport only (lb/d)Jul–Sep001
Solids, total suspendeddaily maximumreport only (lb/d)Jan, Feb, Mar, Apr, Dec001
Solids, total suspendedmonthly averagereport only (mg/L)all year001
Solids, total suspendedmonthly average≤ 10 mg/LMay, Jun, Oct, Nov001
Solids, total suspendedmonthly average≤ 11000 lb/dMay, Jun, Oct, Nov001
Solids, total suspendedmonthly average≤ 17000 lb/dJan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec001
Solids, total suspendeddaily maximumreport only (lb/d)May, Jun, Oct, Nov001
Solids, total suspendeddaily maximum≤ 34000 lb/dJan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec001
Solids, total suspendedmaximum weekly average≤ 15 mg/LMay, Jun, Oct, Nov001
Solids, total suspendedmaximum weekly average≤ 17000 lb/dMay, Jun, Oct, Nov001
Solids, total suspendedmaximum weekly average≤ 26000 lb/dJan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec001
Solids, total suspendedmonthly average≤ 5 mg/LMay, Jun, Oct, Nov001
Solids, total suspendedmonthly average≤ 6400 lb/dMay, Jun, Oct, Nov001
Solids, total suspendedmonthly average≤ 2700 lb/dMay–Nov001
Solids, total suspendeddaily maximumreport only (lb/d)May, Jun, Oct, Nov001
Solids, total suspendeddaily maximum≤ 5400 lb/dMay–Nov001
Solids, total suspendedmaximum weekly average≤ 8 mg/LMay, Jun, Oct, Nov001
Solids, total suspendedmaximum weekly average≤ 9600 lb/dMay, Jun, Oct, Nov001
Solids, total suspendedmaximum weekly average≤ 4000 lb/dMay–Nov001
Solids, total suspendedmonthly average≤ 3000 lb/dMay–Nov001
Solids, total suspendeddaily maximum≤ 6000 lb/dMay–Nov001
Solids, total suspendedmaximum weekly average≤ 4500 lb/dMay–Nov001
Solids, total suspendedmaximum weekly average≤ 8 mg/LJul–Sep001
Solids, total suspendedmaximum weekly average≤ 15 mg/LJan, Feb, Mar, Apr, Dec001
Solids, total suspendedmaximum weekly average≤ 9600 lb/dJul–Sep001
Solids, total suspendedmaximum weekly average≤ 17000 lb/dJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 5.4 mg/LJun–Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 15 mg/LJun–Oct001
Nitrogen, ammonia total [as N]monthly maximumreport only (mg/L)all year001
Nitrogen, ammonia total [as N]monthly average≤ 16.6 mg/LMay001
Nitrogen, ammonia total [as N]daily maximum≤ 39.5 mg/LMay001
Nitrogen, ammonia total [as N]monthly average≤ 7.7 mg/LMay001
Nitrogen, ammonia total [as N]daily maximum≤ 18.4 mg/LMay001
Nitrogen, ammonia total [as N]monthly average≤ 23.3 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 55.5 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 14.3 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 34.2 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 8.5 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 20.3 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]7-day medianreport only (lb/d)all year001
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all year001
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all year001
Phosphorus, total [as P]monthly medianreport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec001
Phosphorus, total [as P]monthly median≤ .11 mg/LMay–Oct001
Phosphorus, total [as P]daily maximumreport only (mg/L)May–Oct001
Phosphorus, total [as P]daily maximumreport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec001
Phosphorus, total [as P]monthly maximumreport only (mg/L)all year001
Phosphorus, total [as P]monthly medianreport only (mg/L)Sep, Oct001
Phosphorus, total [as P]daily maximumreport only (mg/L)Sep, Oct001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantmaximum daily averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantmaximum daily averagereport only (MGD)all year001
Chlorine, total residualmonthly average≤ .05 mg/Lall year001
Chlorine, total residualdaily maximum≤ .05 mg/Lall year001
E. colimonthly geometric mean≤ 126 #/100mLall year001
E. colidaily maximum≤ 406 #/100mLall year001
E. colimonthly geometric mean≤ 126 #/100mLall year001
E. colidaily maximumreport only (#/100mL)all year001
Excess thermal loadhighest 7-day averagereport only (mkcal/day)May–Oct001
Excess thermal loaddaily maximum≤ 20 mkcal/dayMay–Oct001
Excess thermal loadhighest 7-day averagereport only (mkcal/day)May–Oct001
Excess thermal loaddaily maximum≤ 36 mkcal/dayMay–Oct001
pH, maximumdaily maximum≤ 9 SU (alert, not enforceable)all year001
pH, maximummonthly maximumreport only (SU)all year001
pH, minimumdaily minimum≥ 6.2 SU (alert, not enforceable)all year001
pH, minimummonthly minimumreport only (SU)all year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 5 mg/LJul–Sep001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/LJan, Feb, Mar, Apr, Dec001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 950 lb/dJul–Sep001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 3500 lb/dJan, Feb, Mar, Apr, Dec001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 1900 lb/dJul–Sep001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 7000 lb/dJan, Feb, Mar, Apr, Dec001
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/LMay, Jun, Oct, Nov001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 3500 lb/dMay, Jun, Oct, Nov001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 7000 lb/dMay, Jun, Oct, Nov001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 15 mg/LMay, Jun, Oct, Nov001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 5300 lb/dMay, Jun, Oct, Nov001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 5 mg/LMay, Jun, Oct, Nov001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 950 lb/dMay, Jun, Oct, Nov001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 1900 lb/dMay, Jun, Oct, Nov001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 8 mg/LMay, Jun, Oct, Nov001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 1400 lb/dMay, Jun, Oct, Nov001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 8 mg/LJul–Sep001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 15 mg/LJan, Feb, Mar, Apr, Dec001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 1400 lb/dJul–Sep001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 5300 lb/dJan, Feb, Mar, Apr, Dec001
BOD, carbonaceous, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
pH range excursions, > 60 minutestotal≤ 0 occur/moall year001
pH range excursions, monthly total accumtotal≤ 446 minall year001
pHdaily minimum≥ 6.2 SUall year003
pHdaily maximum≤ 9 SUall year003
Solids, total suspendedmonthly average≤ 10 mg/LJan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec003
Solids, total suspendedmonthly average≤ 11000 lb/dJan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec003
Solids, total suspendeddaily maximumreport only (lb/d)Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec003
Solids, total suspendedmonthly averagereport only (mg/L)May–Nov003
Solids, total suspendedmonthly averagereport only (lb/d)May–Nov003
Solids, total suspendeddaily maximumreport only (lb/d)May–Nov003
Solids, total suspendedmaximum weekly averagereport only (mg/L)May–Nov003
Solids, total suspendedmaximum weekly averagereport only (lb/d)May–Nov003
Solids, total suspendedmaximum weekly average≤ 15 mg/LJan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec003
Solids, total suspendedmaximum weekly average≤ 17000 lb/dJan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec003
Durationtotalreport only (hr)all year003
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year003
Flow, in conduit or thru treatment plantmaximum daily averagereport only (MGD)all year003
Chlorine, total residualmonthly average≤ .05 mg/Lall year003
Chlorine, total residualdaily maximum≤ .05 mg/Lall year003
E. colimonthly geometric mean≤ 126 #/100mLJan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec003
E. colidaily maximum≤ 406 #/100mLJan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec003
E. colimonthly geometric mean≤ 126 #/100mLJan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec003
E. colidaily maximumreport only (#/100mL)Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec003
E. colimonthly geometric meanreport only (#/100mL)May–Nov003
E. colidaily maximumreport only (#/100mL)May–Nov003
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/LJan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec003
BOD, carbonaceous [5 day, 20 C]monthly average≤ 3500 lb/dJan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec003
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 7000 lb/dJan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec003
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)May–Nov003
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (lb/d)May–Nov003
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (lb/d)May–Nov003
BOD, carbonaceous [5 day, 20 C]maximum weekly averagereport only (mg/L)May–Nov003
BOD, carbonaceous [5 day, 20 C]maximum weekly averagereport only (lb/d)May–Nov003
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 15 mg/LJan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec003
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 5300 lb/dJan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec003
Solids, suspended percent removalmonthly average minimum≥ 85 %Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec003
Solids, suspended percent removalmonthly average minimumreport only (%)May–Nov003
Carbonaceous oxygen demand, % removalmonthly average minimum≥ 85 %Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec003
Carbonaceous oxygen demand, % removalmonthly average minimumreport only (%)May–Nov003

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/OR0028118 · MCP: https://passage-data.com/mcp