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Carlton, City of

Sewage treatment plant, Carlton, Oregon. NPDES permit OR0020541 expired Jun 30, 2015; its limits still apply. Last 12 months: over a limit 12 times (last March 2026), 27 required values missing, 5 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 16 days after each period: form A monthly (7 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
4 values over a limit, 15 required values missing, 4 of 12 reports late

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

Period endingParameterReportedLimitOver by
November 2025BOD, 5-day, 20 deg. C, monthly average149.7 lb/d≤ 92 lb/d63%
November 2025BOD, 5-day, 20 deg. C, monthly average149.7 lb/d≤ 92 lb/d63%
November 2025BOD, 5-day, 20 deg. C, monthly average35 mg/L≤ 30 mg/L17%
November 2025BOD, 5-day, 20 deg. C, monthly average35 mg/L≤ 30 mg/L17%
November 2025BOD, 5-day, 20 deg. C, weekly average166.8 lb/d≤ 138 lb/d21%
November 2025BOD, 5-day, 20 deg. C, weekly average166.8 lb/d≤ 138 lb/d21%
November 2025BOD, 5-day, percent removal, monthly average minimum83.3 %≥ 85 %11%
November 2025Solids, total suspended, monthly average201 lb/d≤ 153 lb/d31%
November 2025Solids, total suspended, monthly average201 lb/d≤ 153 lb/d31%
March 2026BOD, 5-day, 20 deg. C, daily maximum221.9 lb/d≤ 184 lb/d21%
March 2026BOD, 5-day, 20 deg. C, monthly average188.5 lb/d≤ 92 lb/d105%
March 2026BOD, 5-day, 20 deg. C, weekly average221.9 lb/d≤ 138 lb/d61%

Limits in force (32)

ParameterStatisticLimitMonths
Temperature, water deg. centigrademonthly averagereport only (deg C)Jan, Feb, Mar, Apr, Nov, Dec
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, 5-day, 20 deg. Cmonthly average≤ 92 lb/dJan, Feb, Mar, Apr, Nov, Dec
BOD, 5-day, 20 deg. Cdaily maximum≤ 184 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≤ 45 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, 5-day, 20 deg. Cweekly average≤ 138 lb/dJan, Feb, Mar, Apr, Nov, Dec
pHdaily minimum≥ 6 SUJan, Feb, Mar, Apr, Nov, Dec
pHdaily maximum≤ 9 SUJan, Feb, Mar, Apr, Nov, Dec
pHdaily minimumreport only (SU)all year
pHdaily maximumreport only (SU)all year
Solids, total suspendedmonthly average≤ 50 mg/LJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedmonthly average≤ 153 lb/dJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendeddaily maximum≤ 306 lb/dJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedweekly average≤ 80 mg/LJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedweekly average≤ 229 lb/dJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)Jan, Feb, Mar, Apr, Nov, Dec
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)Jan, Feb, Mar, Apr, 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≤ .1 mg/LJan, Feb, Mar, Apr, Nov, Dec
Chlorine, total residualdaily maximum≤ .1 mg/LJan, Feb, Mar, Apr, Nov, Dec
E. colimonthly geometric mean≤ 126 #/100mLJan, Feb, Mar, Apr, Nov, Dec
E. colidaily maximum≤ 406 #/100mLJan, Feb, Mar, Apr, Nov, Dec
E. colimonthly geometric mean≤ 126 #/100mLJan, Feb, Mar, Apr, Nov, Dec
E. colidaily maximumreport only (#/100mL)Jan, Feb, Mar, Apr, Nov, Dec
Flow, totaldaily maximum≤ 0 galMay–Oct
BOD, 5-day, percent removalmonthly average minimum≥ 85 %Jan, Feb, Mar, Apr, Nov, Dec
Solids, suspended percent removalmonthly average minimum≥ 65 %Jan, Feb, Mar, Apr, Nov, Dec
Chlorine usagemonthly averagereport only (lb/d)Jan, Feb, Mar, Apr, Nov, Dec

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

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