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City of Rock Island

Sewage treatment plant, Rock Island, Washington. NPDES permit WA0501487, in force until Feb 28, 2031. Last 12 months: no values over a limit, 151 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall EFFL form M2 monthly (24 values), outfall IN1 form M2 monthly (9 values), outfall EFFL form A2 yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 26 reports late

Limits in force (40)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigrademaximumreport only (deg C) (alert, not enforceable)all yearEFFL
Temperature, water deg. centigrademonthly averagereport only (deg C) (alert, not enforceable)all yearEFFL
Oxygen, dissolved [DO]single readingreport only (mg/L) (alert, not enforceable)all yearEFFL
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall yearEFFL
BOD, 5-day, 20 deg. Cmaximumreport only (mg/L) (alert, not enforceable)all yearEFFL
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall yearEFFL
BOD, 5-day, 20 deg. Cmaximumreport only (lb/d) (alert, not enforceable)all yearEFFL
BOD, 5-day, 20 deg. Cmonthly average≤ 84 lb/dall yearEFFL
BOD, 5-day, 20 deg. Cweekly average≤ 127 lb/dall yearEFFL
BOD, 5-day, 20 deg. Cweekly average≤ 127 lb/dall yearEFFL
pHdaily minimum≥ 6 SUall yearEFFL
pHdaily maximum≤ 9 SUall yearEFFL
Solids, total suspendedmonthly average≤ 30 mg/Lall yearEFFL
Solids, total suspendedmaximumreport only (mg/L) (alert, not enforceable)all yearEFFL
Solids, total suspendedweekly average≤ 45 mg/Lall yearEFFL
Solids, total suspendedmonthly average≤ 84 lb/dall yearEFFL
Solids, total suspendedmaximumreport only (lb/d) (alert, not enforceable)all yearEFFL
Solids, total suspendedweekly average≤ 127 lb/dall yearEFFL
Solids, total suspendedweekly average≤ 127 lb/dall yearEFFL
Oil and grease, hexane extr methodsingle readingreport only (mg/L) (alert, not enforceable)all yearEFFL
Nitrogen, ammonia total [as N]maximumreport only (mg/L) (alert, not enforceable)all yearEFFL
Nitrogen, Kjeldahl, total [as N]single readingreport only (mg/L) (alert, not enforceable)all yearEFFL
Phosphorus, total [as P]single readingreport only (mg/L) (alert, not enforceable)all yearEFFL
Arsenic, total [as As]single readingreport only (mg/L) (alert, not enforceable)all yearEFFL
E. colisingle readingreport only (#/100mL) (alert, not enforceable)all yearEFFL
Solids, total dissolvedsingle readingreport only (mg/L) (alert, not enforceable)all yearEFFL
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall yearEFFL
Coliform, fecal generalweekly geometric mean≤ 400 #/100mLall yearEFFL
Flowmaximumreport only (MGD) (alert, not enforceable)all yearEFFL
Flowmonthly averagereport only (MGD) (alert, not enforceable)all yearEFFL
Flowmonthly totalreport only (MGD) (alert, not enforceable)all yearEFFL
BOD, 5-day, 20 deg. Cmaximumreport only (mg/L) (alert, not enforceable)all yearIN1
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L) (alert, not enforceable)all yearIN1
BOD, 5-day, 20 deg. Cmonthly averagereport only (lb/d) (alert, not enforceable)all yearIN1
Solids, total suspendedmaximumreport only (mg/L) (alert, not enforceable)all yearIN1
Solids, total suspendedmonthly averagereport only (mg/L) (alert, not enforceable)all yearIN1
Solids, total suspendedmonthly averagereport only (lb/d) (alert, not enforceable)all yearIN1
Flowmaximumreport only (MGD) (alert, not enforceable)all yearIN1
Flowmonthly averagereport only (MGD) (alert, not enforceable)all yearIN1
Flowmonthly totalreport only (MGD) (alert, not enforceable)all yearIN1

How strict are these limits?

Cited limits by parameter: Washington'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/WA0501487 · MCP: https://passage-data.com/mcp