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Molalla, City of

Sewage treatment plant, Molalla, Oregon. NPDES permit OR0022381, in force until Oct 31, 2030. Last 12 months: over a limit 6 times (last April 2026), 1 of 30 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
13 values over a limit, 0 required values missing, 0 of 19 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimitOver by
November 2025BOD, 5-day, 20 deg. C, monthly average13 mg/L≤ 10 mg/L30%
November 2025BOD, 5-day, 20 deg. C, monthly average187 lb/d≤ 160 lb/d17%
November 2025BOD, 5-day, 20 deg. C, weekly average17 mg/L≤ 15 mg/L13%
November 2025Flow, total, daily maximum1708000 gal≤ 0 gal—
November 2025Nitrogen, ammonia total [as N], monthly average21.7 mg/L≤ 16.7 mg/L30%
April 2026BOD, 5-day, percent removal, monthly average minimum84 %≥ 85 %7%

Limits in force (57)

ParameterStatisticLimitMonths
Temperature, water deg. centigrademonthly averagereport only (deg C)Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
Temperature, water deg. centigradedaily maximumreport only (deg C)Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
Temperature, water deg. centigrademonthly averagereport only (deg C)Jan, Feb, Mar, Apr, Nov, Dec
Temperature, water deg. centigrademonthly averagereport only (deg C)May, Jun, Oct
Temperature, water deg. centigradedaily maximumreport only (deg C)Jan, Feb, Mar, Apr, Nov, Dec
Temperature, water deg. centigradedaily maximumreport only (deg C)May, Jun, Oct
Temperature, water deg. centigrademaximum 7-day averagereport only (deg C)Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
Flow ratemonthly averagereport only (cfs)Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
Flow ratedaily maximumreport only (cfs)Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
Flow ratemaximum 7-day averagereport only (cfs)Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
BOD, 5-day, 20 deg. Cmonthly average≤ 10 mg/LMay, Jun, Oct
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, 5-day, 20 deg. Cmonthly average≤ 92 lb/dMay, Jun, Oct
BOD, 5-day, 20 deg. Cmonthly average≤ 480 lb/dJan, Feb, Mar, Apr, Nov, Dec
BOD, 5-day, 20 deg. Cdaily maximum≤ 180 lb/dMay, Jun, Oct
BOD, 5-day, 20 deg. Cdaily maximum≤ 960 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≤ 15 mg/LMay, Jun, Oct
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, 5-day, 20 deg. Cweekly average≤ 140 lb/dMay, Jun, Oct
BOD, 5-day, 20 deg. Cweekly average≤ 720 lb/dJan, Feb, Mar, Apr, Nov, Dec
pHdaily minimum≥ 6.2 SU (alert, not enforceable)Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
pHdaily maximum≤ 9 SU (alert, not enforceable)Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
pHmonthly minimumreport only (SU)all year
pHmonthly maximumreport only (SU)all year
Solids, total suspendedmonthly average≤ 10 mg/LMay, Jun, Oct
Solids, total suspendedmonthly average≤ 30 mg/LJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedmonthly average≤ 92 lb/dMay, Jun, Oct
Solids, total suspendedmonthly average≤ 480 lb/dJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendeddaily maximum≤ 180 lb/dMay, Jun, Oct
Solids, total suspendeddaily maximum≤ 960 lb/dJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedweekly average≤ 15 mg/LMay, Jun, Oct
Solids, total suspendedweekly average≤ 45 mg/LJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedweekly average≤ 140 lb/dMay, Jun, Oct
Solids, total suspendedweekly average≤ 720 lb/dJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 16.7 mg/LJan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 25.9 mg/LJan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
Nitrogen, ammonia total [as N]monthly maximumreport only (mg/L)Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
Flow, in conduit or thru treatment plantdaily maximum≤ 0 MGDJul–Sep
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 plantdaily maximum≤ 0 MGDJan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
Chlorine, total residualmonthly average≤ .05 mg/LJan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
Chlorine, total residualdaily maximum≤ .06 mg/LJan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
E. colimonthly geometric mean≤ 126 #/100mLJan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
E. colidaily maximum≤ 406 #/100mLJan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
E. colimonthly geometric mean≤ 126 #/100mLJan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
E. colidaily maximumreport only (#/100mL)Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
Excess thermal loadmaximum 7-day average≤ 14.5 mkcal/dayMay, Jun, Oct
BOD, 5-day, percent removalmonthly average minimum≥ 85 %Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
Solids, suspended percent removalmonthly average minimum≥ 85 %Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
Chlorine usagemonthly averagereport only (lb/d)Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
pH range excursions, > 60 minutestotal≤ 0 occur/moJan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
pH range excursions, monthly total accumtotal≤ 446 minJan, Feb, Mar, Apr, May, Jun, Oct, 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

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