MOLALLA, CITY OF

NPDES permit OR0022381 · Minor POTW · effective, expires 2030-10-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

EPA's record, 2025-09-01 to 2026-08-31

6values over a limit
0required values missing, on 0 form(s)
1of 29 forms filed late

Last period with anything received: 2026-08-31. Most often over: BOD, 5-day, 20 deg. C (3), Flow, total (1), BOD, 5-day, percent removal (1).

Reporting

Reports are due about 16 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (57)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. centigradeMO AVG report only Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
001Temperature, water deg. centigradeDAILY MX report only Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
001Temperature, water deg. centigradeMO AVG report only Jan, Feb, Mar, Apr, Nov, Dec
001Temperature, water deg. centigradeMO AVG report only May, Jun, Oct
001Temperature, water deg. centigradeDAILY MX report only Jan, Feb, Mar, Apr, Nov, Dec
001Temperature, water deg. centigradeDAILY MX report only May, Jun, Oct
001Temperature, water deg. centigradeMX 7D AV report only Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
001Flow rateMO AVG report only Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
001Flow rateDAILY MX report only Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
001Flow rateMX 7D AV report only Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
001BOD, 5-day, 20 deg. CMO AVG <= 10 mg/L May, Jun, Oct
001BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001BOD, 5-day, 20 deg. CMO AVG <= 92 lb/d May, Jun, Oct
001BOD, 5-day, 20 deg. CMO AVG <= 480 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001BOD, 5-day, 20 deg. CDAILY MX <= 180 lb/d May, Jun, Oct
001BOD, 5-day, 20 deg. CDAILY MX <= 960 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001BOD, 5-day, 20 deg. CMO AVG report only all year
001BOD, 5-day, 20 deg. CWKLY AVG <= 15 mg/L May, Jun, Oct
001BOD, 5-day, 20 deg. CWKLY AVG <= 45 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001BOD, 5-day, 20 deg. CWKLY AVG <= 140 lb/d May, Jun, Oct
001BOD, 5-day, 20 deg. CWKLY AVG <= 720 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001pHDAILY MN >= 6.2 SU (alert) Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
001pHDAILY MX <= 9 SU (alert) Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
001pHMO MIN report only all year
001pHMO MAX report only all year
001Solids, total suspendedMO AVG <= 10 mg/L May, Jun, Oct
001Solids, total suspendedMO AVG <= 30 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001Solids, total suspendedMO AVG <= 92 lb/d May, Jun, Oct
001Solids, total suspendedMO AVG <= 480 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001Solids, total suspendedDAILY MX <= 180 lb/d May, Jun, Oct
001Solids, total suspendedDAILY MX <= 960 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001Solids, total suspendedMO AVG report only all year
001Solids, total suspendedWKLY AVG <= 15 mg/L May, Jun, Oct
001Solids, total suspendedWKLY AVG <= 45 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001Solids, total suspendedWKLY AVG <= 140 lb/d May, Jun, Oct
001Solids, total suspendedWKLY AVG <= 720 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, ammonia total [as N]MO AVG <= 16.7 mg/L Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 25.9 mg/L Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
001Nitrogen, ammonia total [as N]MO MAX report only Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
001Flow, in conduit or thru treatment plantDAILY MX <= 0 MGD Jul, Aug, Sep
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Flow, in conduit or thru treatment plantDAILY MX <= 0 MGD Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
001Flow, in conduit or thru treatment plantMO AVG report only Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
001Flow, in conduit or thru treatment plantDAILY MX report only Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
001Chlorine, total residualMO AVG <= .05 mg/L Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
001Chlorine, total residualDAILY MX <= .06 mg/L Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
001E. coliMO GEO <= 126 #/100mL Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
001E. coliDAILY MX <= 406 #/100mL Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
001E. coliMO GEO <= 126 #/100mL Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
001E. coliDAILY MX report only Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
001Excess thermal loadMX 7D AV <= 14.5 mkcal/day May, Jun, Oct
001BOD, 5-day, percent removalMO AV MN >= 85 % Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
001Solids, suspended percent removalMO AV MN >= 85 % Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
001Chlorine usageMO AVG report only Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
001pH range excursions, > 60 minutesTOTAL <= 0 occur/mo Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
001pH range excursions, monthly total accumTOTAL <= 446 min Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec

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