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Calvey Creek Sewer District

Sewage treatment plant, Robertsville, Missouri. NPDES permit MO0115401, in force until Jul 31, 2030. Last 12 months: over a limit 12 times (last May 2026), 2 of 25 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 002 form M monthly (18 values), outfall 002 form Q quarterly (2 values), outfall INF form IM monthly (2 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
15 values over a limit, 32 required values missing, 6 of 31 reports late

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

Period endingParameterReportedLimitOver by
October 2025Chlorine, total residual, daily maximum220≤ 208 ug/L6%
October 2025Chlorine, total residual, monthly average220≤ 63 ug/L249%
October 2025Solids, suspended percent removal, monthly average minimum28≥ 65 %106%
October 2025Solids, total suspended, monthly average72≤ 70 mg/L3%
October 2025pH, maximum9.17≤ 9 SU—
November 2025pH, maximum9.19≤ 9 SU—
December 2025Solids, suspended percent removal, monthly average minimum63≥ 65 %6%
May 2026Chlorine, total residual, daily maximum260≤ 208 ug/L25%
May 2026Chlorine, total residual, monthly average260≤ 63 ug/L313%
May 2026E. coli, 30-day geometric mean3300≤ 126 #/100mL2519%
May 2026E. coli, 7-day geometric mean3300≤ 630 #/100mL424%
May 2026Solids, suspended percent removal, monthly average minimum44≥ 65 %60%

Limits in force (22)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]daily minimumreport only (mg/L)Apr–Oct002
Oxygen, dissolved [DO]monthly average minimumreport only (mg/L)Apr–Oct002
BOD, 5-day, 20 deg. Cweekly average≤ 65 mg/Lall year002
BOD, 5-day, 20 deg. Cmonthly average≤ 45 mg/Lall year002
pHminimum≥ 6 SUall year002
pHmaximum≤ 9 SUall year002
Solids, total suspendedweekly average≤ 110 mg/Lall year002
Solids, total suspendedmonthly average≤ 70 mg/Lall year002
Oil and grease [soxhlet extr.] tot.daily maximum≤ 15 mg/Lall year002
Oil and grease [soxhlet extr.] tot.monthly average≤ 10 mg/Lall year002
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year002
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002
Chlorine, total residualdaily maximum≤ 208 ug/LApr–Oct002
Chlorine, total residualmonthly average≤ 63 ug/LApr–Oct002
E. coli7-day geometric mean≤ 630 #/100mLApr–Oct002
E. coli30-day geometric mean≤ 126 #/100mLApr–Oct002
BOD, 5-day, percent removalmonthly average minimum≥ 65 %all year002
Solids, suspended percent removalmonthly average minimum≥ 65 %all year002
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all yearINF
Solids, total suspendedmonthly averagereport only (mg/L)all yearINF

How strict are these limits?

Cited limits by parameter: Missouri'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/MO0115401 · MCP: https://passage-data.com/mcp