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Washington County PWSD #4

Sewage treatment plant, Bismarck, Missouri. NPDES permit MO0132519, in force until Aug 31, 2027. Last 12 months: over a limit 16 times (last September 2026), 12 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form Q quarterly (20 values), outfall INF form IQ quarterly (2 values)
Renewal application due
Mar 4, 2027 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
8 values over a limit, 16 required values missing, 2 of 8 reports late

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

All 16 values over a limit
Period endingParameterReportedLimitOver by
December 2025BOD, 5-day, 20 deg. C, monthly average43.1≤ 30 mg/L44%
December 2025BOD, 5-day, percent removal, monthly average minimum64≥ 85 %140%
December 2025E. coli, 7-day geometric mean> 2420≤ 1030 #/100mL—
December 2025E. coli, monthly average> 2420≤ 206 #/100mL—
December 2025Nitrogen, ammonia total [as N], daily maximum52.1≤ 12.1 mg/L331%
December 2025Nitrogen, ammonia total [as N], monthly average52.1≤ 2.9 mg/L1697%
December 2025Oxygen, dissolved [DO], daily minimum< 2≥ 5 mg/L—
December 2025Oxygen, dissolved [DO], monthly average minimum< 2≥ 5 mg/L—
December 2025Solids, suspended percent removal, monthly average minimum61≥ 85 %160%
March 2026BOD, 5-day, percent removal, monthly average minimum82≥ 85 %20%
March 2026Solids, suspended percent removal, monthly average minimum0≥ 85 %567%
June 2026E. coli, 7-day geometric mean> 2420≤ 1030 #/100mL—
June 2026E. coli, monthly average> 2420≤ 206 #/100mL—
June 2026Nitrogen, ammonia total [as N], monthly average9.4≤ 2 mg/L370%
September 2026Oxygen, dissolved [DO], daily minimum2.73≥ 5 mg/L45%
September 2026Oxygen, dissolved [DO], monthly average minimum2.73≥ 5 mg/L45%

Limits in force (28)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]daily minimum≥ 5 mg/LApr–Dec001
Oxygen, dissolved [DO]monthly average minimum≥ 5 mg/LApr–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
Oil and grease [soxhlet extr.] tot.daily maximumreport only (mg/L)all year001
Oil and grease [soxhlet extr.] tot.monthly averagereport only (mg/L)all year001
Nitrogen, ammonia total [as N]daily maximum≤ 12.1 mg/LOct–Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 12.1 mg/LJan–Mar001
Nitrogen, ammonia total [as N]daily maximum≤ 12.1 mg/LApr–Jun001
Nitrogen, ammonia total [as N]daily maximum≤ 12.1 mg/LJul–Sep001
Nitrogen, ammonia total [as N]monthly average≤ 2.9 mg/LOct–Dec001
Nitrogen, ammonia total [as N]monthly average≤ 3.1 mg/LJan–Mar001
Nitrogen, ammonia total [as N]monthly average≤ 2 mg/LApr–Jun001
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LJul–Sep001
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≤ 18 ug/LApr–Dec001
Chlorine, total residualmonthly average≤ 9 ug/LApr–Dec001
E. coli7-day geometric mean≤ 1030 #/100mLApr–Dec001
E. colimonthly average≤ 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/MO0132519 · MCP: https://passage-data.com/mcp