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

Phelps County PWSD No. 2

Sewage treatment plant, Rolla, Missouri. NPDES permit MO0125482 expired Jun 30, 2023; its limits still apply. Last 12 months: over a limit 7 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
7 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 2025Chlorine, total residual, daily maximum170≤ 17 ug/L900%
December 2025E. coli, weekly average2419.6≤ 1030 #/100mL135%
December 2025Nitrogen, ammonia total [as N], monthly average4.95≤ 2.6 mg/L90%
March 2026Nitrogen, ammonia total [as N], daily maximum16.6≤ 11.9 mg/L39%
March 2026Nitrogen, ammonia total [as N], monthly average8.53≤ 2.6 mg/L228%
March 2026Solids, suspended percent removal, monthly average minimum84≥ 85 %7%
June 2026Chlorine, total residual, daily maximum140≤ 17 ug/L724%

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≤ 11.9 mg/LJan, Feb, Mar, Oct, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 5.7 mg/LApr–Sep
Nitrogen, ammonia total [as N]monthly average≤ 2.6 mg/LJan, Feb, Mar, Oct, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 1.3 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. coliweekly average≤ 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/MO0125482 · MCP: https://passage-data.com/mcp