Passage Data · Check a report · Use it from your AI

Phelps County PWSD No. 2

Sewage treatment plant, Rolla, Missouri. NPDES permit MO0129704 expired Jun 30, 2023; its limits still apply. Last 12 months: over a limit 4 times (last June 2026), 1 of 3 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A quarterly (18 values)
Last report on file
June 2026
Oct 2024 – Sep 2025
3 values over a limit, 32 required values missing, 2 of 4 reports late

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

Period endingParameterReportedLimitOver by
December 2025E. coli, 30-day geometric mean364≤ 206 #/100mL77%
March 2026Nitrogen, ammonia total [as N], daily maximum26≤ 7.5 mg/L247%
March 2026Nitrogen, ammonia total [as N], monthly average13.99≤ 2.9 mg/L382%
June 2026BOD, 5-day, percent removal, monthly average minimum72.41≥ 85 %84%

Limits in force (20)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimumreport only (mg/L)Apr–Dec
Oxygen, dissolved [DO]monthly average minimumreport only (mg/L)Apr–Dec
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year
pHminimum≥ 6.5 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Nitrogen, ammonia total [as N]daily maximum≤ 7.5 mg/LJan, Feb, Mar, Oct, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 3.6 mg/LApr–Sep
Nitrogen, ammonia total [as N]monthly average≤ 2.9 mg/LJan, Feb, Mar, Oct, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 1.4 mg/LApr–Sep
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Chlorine, total residualdaily maximum≤ 17 ug/LApr–Dec
Chlorine, total residualmonthly average≤ 8 ug/LApr–Dec
E. coli7-day geometric mean≤ 1030 #/100mLApr–Dec
E. coli30-day geometric mean≤ 206 #/100mLApr–Dec
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year

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

· Save this facility as a site · Superfund sites nearby · Your permits on one board

On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MO0129704 · MCP: https://passage-data.com/mcp