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Department of Corrections

Sewage treatment plant, Littlerock, Washington. NPDES permit WA0037737, in force until May 31, 2029. Last 12 months: no values over a limit, 97 required values missing, 6 of 56 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form MM monthly (19 values), outfall 001D form MM monthly (2 values), outfall 001U form MM monthly (2 values), outfall 002 form MM monthly (1 value), outfall INFL form MM monthly (6 values), outfall 001 form AA yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 36 required values missing, 0 of 60 reports late

Limits in force (31)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]daily minimum≥ 9.5 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 20 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 11.2 lb/dall year001
BOD, 5-day, 20 deg. Cweekly average≤ 25.1 lb/dall year001
pHmaximum≤ 8.5 SUall year001
pHminimum≥ 6.5 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 16.8 lb/dall year001
Solids, total suspendedweekly average≤ 25.1 lb/dall year001
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L) (alert, not enforceable)all year001
Nitrogen, ammonia total [as N]maximum≤ 1.56 mg/Lall year001
BOD, percent removal [total]minimum≥ 85 %all year001
E. colisingle readingreport only (#/100mL) (alert, not enforceable)all year001
Coliform, fecal generalmonthly geometric mean≤ 100 #/100mLall year001
Coliform, fecal generalweekly geometric mean≤ 200 #/100mLall year001
Flowmaximumreport only (MGD) (alert, not enforceable)all year001
Flowmonthly averagereport only (MGD) (alert, not enforceable)all year001
Solids, suspended percent removalminimum≥ 85 %all year001
Temperature, water deg. centigrademaximumreport only (deg C) (alert, not enforceable)all year001D
Temperature, water deg. centigrademonthly averagereport only (deg C) (alert, not enforceable)all year001D
Temperature, water deg. centigrademaximumreport only (deg C) (alert, not enforceable)all year001U
Temperature, water deg. centigrademonthly averagereport only (deg C) (alert, not enforceable)all year001U
Coliform, fecal generalmonthly averagereport only (#/100mL) (alert, not enforceable)all year002
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L) (alert, not enforceable)all yearINFL
BOD, 5-day, 20 deg. Cmonthly average≤ 150 lb/dall yearINFL
Solids, total suspendedmonthly averagereport only (mg/L) (alert, not enforceable)all yearINFL
Solids, total suspendedmonthly average≤ 150 lb/dall yearINFL
Flowmaximum≤ .138 MGD (alert, not enforceable)all yearINFL
Flowmonthly average≤ .067 MGD (alert, not enforceable)all yearINFL

How strict are these limits?

Cited limits by parameter: Washington's rules and the federal ones.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/WA0037737 · MCP: https://passage-data.com/mcp