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Sterling, City of

Sewage treatment plant, Sterling, Kansas. NPDES permit KS0024783, in force until Dec 31, 2027. Last 12 months: over a limit 5 times (last March 2026), 1 required value missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (13 values), outfall 001 form R monthly (12 values), outfall 002 form A monthly (5 values), outfall 003 form W quarterly (3 values)
Renewal application due
Jul 4, 2027 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
5 values over a limit, 2 required values missing, 2 of 40 reports late

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

Period endingParameterReportedLimitOver by
October 2025BOD, 5-day, 20 deg. C, monthly average36.2 mg/L≤ 30 mg/L21%
October 2025Solids, total suspended, monthly average115 mg/L≤ 80 mg/L44%
March 2026BOD, 5-day, 20 deg. C, monthly average39.3 mg/L≤ 30 mg/L31%
March 2026Solids, total suspended, monthly average150 mg/L≤ 80 mg/L88%
March 2026Solids, total suspended, maximum weekly average150 mg/L≤ 120 mg/L25%

Limits in force (33)

ParameterStatisticLimitMonthsOutfall
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year001
pHmonthly averagereport only (SU)all year001
pHmonthly averagereport only (SU)all year001
Solids, total suspendedmonthly average≤ 80 mg/Lall year001
Solids, total suspendedmaximum weekly average≤ 120 mg/Lall year001
Solids, total suspendedmonthly averagereport only (mg/L)all year001
Nitrogen, total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, ammonia total [as N]monthly average≤ 7.4 mg/Lall year001
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year001
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year001
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year001
Phosphorus, total [as P]monthly averagereport only (mg/L)all year001
Phosphorus, total [as P]monthly averagereport only (mg/L)all year001
Chloride [as Cl]monthly averagereport only (mg/L)all year001
Chloride [as Cl]monthly averagereport only (mg/L)all year001
Selenium, total recoverablemonthly averagereport only (ug/L)all year001
Selenium, total recoverablemonthly averagereport only (mg/L)all year001
E. colimonthly geometric mean≤ 3843 #/100mLall year001
E. colimonthly geometric meanreport only (#/100mL)all year001
Flow, irrigationmonthly averagereport only (gal/d)all year001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year002
Solids, total suspendedmonthly averagereport only (mg/L)all year002
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year002
Phosphorus, total [as P]monthly averagereport only (mg/L)all year002
Chloride [as Cl]monthly averagereport only (mg/L)all year002
pHmonthly averagereport only (SU)all year003
Nitrogen, nitrate total [as N]monthly averagereport only (mg/L)all year003
Chloride [as Cl]monthly averagereport only (mg/L)all year003

How strict are these limits?

Cited limits by parameter: Kansas'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/KS0024783 · MCP: https://passage-data.com/mcp