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City of Chippewa Falls

Sewage treatment plant, major discharger, Chippewa Falls, Wisconsin. NPDES permit WI0023604 expired Sep 30, 2025; its limits still apply. Last 12 months: over a limit 9 times (last April 2026), 20 required values missing, 3 of 45 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 21 days after each period: outfall 004 form A monthly (9 values), outfall 101 form A monthly (1 value), outfall 701 form A monthly (10 values), outfall 701 form Q quarterly (1 value)
Last report on file
June 2026
Oct 2024 – Sep 2025
2 values over a limit, 0 required values missing, 0 of 56 reports late

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

Period endingParameterReportedLimitOver by
January 2026Phosphorus, total [as P], monthly average2.0574≤ 1.4 mg/L47%
February 2026Phosphorus, total [as P], monthly average2.435≤ 1.4 mg/L74%
February 2026Solids, total suspended, weekly average48.2857≤ 45 mg/L7%
March 2026BOD, carbonaceous [5 day, 5 C], monthly average37.9355≤ 25 mg/L52%
March 2026BOD, carbonaceous [5 day, 5 C], weekly average45≤ 40 mg/L13%
March 2026Phosphorus, total [as P], monthly average3.779≤ 1.4 mg/L170%
March 2026Solids, total suspended, monthly average37.9032≤ 30 mg/L26%
March 2026Solids, total suspended, weekly average47.5714≤ 45 mg/L6%
April 2026Mercury, total recoverable, daily maximum5.8≤ 4.9 ng/L18%

Limits in force (31)

ParameterStatisticLimitMonthsOutfall
Nitrogen, total [as N]monthly maximumreport only (mg/L)all year001
Nitrogen, ammonia total [as N]monthly maximumreport only (mg/L)all year001
Nitrogen, Kjeldahl, total [as N]monthly maximumreport only (mg/L)all year001
Nitrite + Nitrate total [as N]monthly maximumreport only (mg/L)all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all year001
pHdaily minimum≥ 6 SUall year004
pHdaily maximum≤ 9 SUall year004
Solids, total suspendedweekly average≤ 45 mg/Lall year004
Solids, total suspendedmonthly average≤ 30 mg/Lall year004
Nitrogen, total [as N]quarterly maximumreport only (mg/L)all year004
Nitrogen, ammonia total [as N]quarterly maximumreport only (mg/L)all year004
Nitrogen, Kjeldahl, total [as N]quarterly maximumreport only (mg/L)all year004
Nitrite + Nitrate total [as N]quarterly maximumreport only (mg/L)all year004
Phosphorus, total [as P]monthly average≤ 1.4 mg/Lall year004
Copper, total recoverablemonthly maximumreport only (ug/L)all year004
Mercury, total recoverabledaily maximum≤ 4.9 ng/Lall year004
BOD, carbonaceous [5 day, 5 C]weekly average≤ 40 mg/Lall year004
BOD, carbonaceous [5 day, 5 C]monthly average≤ 25 mg/Lall year004
Mercury, total recoverablemonthly maximumreport only (ng/L)all year101
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year701
BOD, 5-day, 20 deg. Cmonthly maximumreport only (mg/L)all year701
Solids, total suspendedmonthly averagereport only (mg/L)all year701
Solids, total suspendedmonthly maximumreport only (mg/L)all year701
Phosphorus, total [as P]monthly maximumreport only (mg/L)all year701
Lead, total recoverablequarterly maximumreport only (ug/L)all year701
Copper, total recoverablemonthly maximumreport only (ug/L)all year701
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year701
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all year701
Mercury, total recoverablemonthly maximumreport only (ng/L)all year701
BOD, carbonaceous [5 day, 5 C]monthly maximumreport only (mg/L)all year701

How strict are these limits?

Cited limits by parameter: Wisconsin'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/WI0023604 · MCP: https://passage-data.com/mcp