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Public Water Supply District No. 2

Sewage treatment plant, Rolla, Missouri. NPDES permit MO0125032, in force until Oct 31, 2030. Last 12 months: over a limit 3 times (last December 2025), 2 of 6 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form Q quarterly, outfall INF form IQ quarterly
Last report on file
June 2026
Oct 2024 – Sep 2025
6 values over a limit, 4 required values missing, 2 of 4 reports late

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

Period endingParameterReportedLimitOver by
December 2025E. coli, 7-day geometric mean2419.6≤ 1030 #/100mL135%
December 2025Nitrogen, ammonia total [as N], daily maximum32.6≤ 11.8 mg/L176%
December 2025Nitrogen, ammonia total [as N], monthly average28.25≤ 2.6 mg/L987%

Limits in force (22)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]daily minimumreport only (mg/L)Apr–Dec001
Oxygen, dissolved [DO]monthly average minimumreport only (mg/L)Apr–Dec001
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year001
pHminimum≥ 6.5 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Nitrogen, ammonia total [as N]daily maximum≤ 6 mg/LApr–Sep001
Nitrogen, ammonia total [as N]daily maximum≤ 11.8 mg/LJan, Feb, Mar, Oct, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 1.2 mg/LApr–Sep001
Nitrogen, ammonia total [as N]monthly average≤ 2.6 mg/LJan, Feb, Mar, Oct, Nov, Dec001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Chlorine, total residualdaily maximum≤ 17 ug/LApr–Dec001
Chlorine, total residualmonthly average≤ 7 ug/LApr–Dec001
E. coli7-day geometric mean≤ 1030 #/100mLApr–Dec001
E. coli30-day geometric mean≤ 206 #/100mLApr–Dec001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
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/MO0125032 · MCP: https://passage-data.com/mcp