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Riverside, Town of

Sewage treatment plant, (Unknown City), Wyoming. NPDES permit WY0032662 expired Jun 30, 2024; its limits still apply. Last 12 months: over a limit 8 times (last April 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form MQ quarterly (20 values), form AA yearly
Last report on file
June 2026
Oct 2024 – Sep 2025
21 values over a limit, 0 required values missing, 3 of 13 reports late

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

Period endingParameterReportedLimitOver by
December 2025BOD, 5-day, 20 deg. C, monthly average83 mg/L≤ 30 mg/L177%
December 2025BOD, 5-day, 20 deg. C, weekly average83 mg/L≤ 45 mg/L84%
December 2025BOD, 5-day, percent removal, monthly average minimum45 %≥ 85 %267%
December 2025E. coli, daily maximum920.8 MPN/100mL≤ 630 MPN/100mL46%
December 2025E. coli, monthly average632.45 MPN/100mL≤ 630 MPN/100mL0%
April 2026BOD, 5-day, 20 deg. C, monthly average34 mg/L≤ 30 mg/L13%
April 2026BOD, 5-day, percent removal, monthly average minimum55 %≥ 85 %200%
April 2026pH, instantaneous maximum9.1 SU≤ 9 SU—

Limits in force (32)

ParameterStatisticLimitMonths
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 90 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cweekly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year
pHinstantaneous minimum≥ 6.5 SUall year
pHinstantaneous maximum≤ 9 SUall year
Solids, total suspendeddaily maximumreport only (mg/L)all year
Solids, total suspendedmonthly average≤ 100 mg/Lall year
Solids, total suspendedweekly average≤ 150 mg/Lall year
Solids, total suspendeddaily maximum≤ 300 mg/Lall year
Nitrogen, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Phosphate, ortho [as P]daily maximumreport only (mg/L)all year
Durationmonthly totalreport only (d)all year
Chlorine, total residualmonthly average≤ 1.09 mg/LApr–Sep
Chlorine, total residualmonthly average≤ 2.14 mg/LJan, Feb, Mar, Oct, Nov, Dec
Chlorine, total residualdaily maximum≤ 1.88 mg/LApr–Sep
Chlorine, total residualdaily maximum≤ 4.15 mg/LJan, Feb, Mar, Oct, Nov, Dec
E. colimonthly average≤ 126 MPN/100mLApr–Sep
E. colimonthly average≤ 630 MPN/100mLJan, Feb, Mar, Oct, Nov, Dec
E. colidaily maximum≤ 576 MPN/100mLApr–Sep
E. colidaily maximum≤ 630 MPN/100mLJan, Feb, Mar, Oct, Nov, Dec
Solids, total dissolveddaily maximumreport only (mg/L)all year
Flowmonthly average≤ .015 MGDall year
Flowdaily maximumreport only (MGD)all year
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly averagereport only (%)all year

How strict are these limits?

Cited limits by parameter: Wyoming's rules and the federal ones.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/WY0032662 · MCP: https://passage-data.com/mcp