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Riverton, City of

Sewage treatment plant, major discharger, Riverton, Wyoming. NPDES permit WY0020672, in force until Jan 31, 2029. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form NU monthly (4 values), form QQ quarterly (2 values), form WM monthly (26 values), form MA yearly
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 29 reports late

Limits in force (39)

ParameterStatisticLimitMonths
Temperature, water deg. centigrademonthly averagereport only (deg C)all year
Oxygen, dissolved [DO]daily maximumreport only (mg/L)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 maximumreport only (mg/L)all 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 suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendeddaily maximumreport only (mg/L)all year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendeddaily maximumreport only (mg/L)all year
Solids, total suspendedweekly averagereport only (mg/L)all year
Nitrogen, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly average≤ 6.14 mg/LJan, Feb, Mar, Apr, Oct, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 2.3 mg/LMay–Sep
Nitrogen, ammonia total [as N]daily maximum≤ 13.81 mg/LJan, Feb, Mar, Apr, Oct, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 9.02 mg/LMay–Sep
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L) (alert, not enforceable)all year
Phosphate, ortho [as P]daily maximumreport only (mg/L)all year
Durationmonthly totalreport only (d)all year
Chlorine, total residualdaily maximum≤ .02 mg/LMay–Sep
Chlorine, total residualdaily maximum≤ .03 mg/LJan, Feb, Mar, Apr, Oct, Nov, Dec
E. colimonthly geometric mean≤ 199 #/100mLMay–Sep
E. colimonthly geometric mean≤ 1801 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
E. colidaily maximum≤ 1083 #/100mLMay–Sep
E. colidaily maximum≤ 1801 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
Solids, total dissolveddaily maximumreport only (mg/L)all year
Flowmonthly average≤ 4.95 MGDall year
Flowdaily maximumreport only (MGD)all year
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year
Produced water, oil and greasedaily maximum≤ 10 mg/Lall year
Pass/Fail Static Renewal 7Day Chronic Pimephales promelas7-day maximum≤ 0 pass=0;fail=1all year
Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day maximum≤ 0 pass=0;fail=1all year

How strict are these limits?

Cited limits by parameter: Wyoming'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/WY0020672 · MCP: https://passage-data.com/mcp