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Rock Springs, City of

Sewage treatment plant, major discharger, Rock Springs, Wyoming. NPDES permit WY0022357, in force until Mar 31, 2029. Last 12 months: no values over a limit, 17 required values missing, 5 of 29 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form CC quarterly (2 values), form MQ quarterly (2 values), form QQ quarterly (5 values), form VM monthly (25 values), form AN yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
1 value over a limit, 14 required values missing, 6 of 27 reports late

Limits in force (44)

ParameterStatisticLimitMonths
Temperature, water deg. centigradedaily maximumreport 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 suspendedweekly averagereport only (mg/L)all year
Solids, total suspendeddaily maximumreport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly average≤ 3.14 mg/LJan, Feb, Mar, Apr, Oct, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 2.74 mg/LMay–Sep
Nitrogen, ammonia total [as N]daily maximum≤ 20.8 mg/LJan, Feb, Mar, Apr, Oct, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 20.5 mg/LMay–Sep
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all year
Hardness, total [as CaCO3]monthly averagereport only (mg/L)all year
Copper, total [as Cu]monthly average≤ 21.3 ug/Lall year
Nickel, total [as Ni]daily maximumreport only (ug/L)all year
Zinc, total [as Zn]daily maximumreport only (mg/L)all year
Chloridemonthly average≤ 230 mg/Lall year
Chloridemonthly average≤ 230 mg/Lall year
Durationmonthly totalreport only (d)all year
Chlorine, total residualdaily maximum≤ .011 mg/Lall year
E. colimonthly geometric mean≤ 630 MPN/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
E. colimonthly geometric mean≤ 126 MPN/100mLMay–Sep
E. colidaily maximum≤ 630 MPN/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
E. colidaily maximum≤ 235 MPN/100mLMay–Sep
Phosphorus, Totaldaily maximumreport only (mg/L)all year
Solids, total dissolveddaily maximumreport only (mg/L)all year
Solids, total dissolveddaily maximumreport only (mg/L)all year
Solids, total dissolved [TDS]daily maximumreport only (mg/L)all year
Flowmonthly averagereport only (MGD)all 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 maximumreport only (mg/L)all year
Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day maximum≤ 0 pass=0;fail=1all year
Pass/Fail Static Renewal 7Day Chronic Pimephales promelas7-day maximum≤ 0 pass=0;fail=1all 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/WY0022357 · MCP: https://passage-data.com/mcp