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Pilot Company

Sewerage Systems, Evanston, Wyoming. NPDES permit WY0035700, in force until Feb 28, 2030. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form MQ quarterly (26 values)
Last report on file
June 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 12 reports late

Limits in force (26)

ParameterStatisticLimitMonths
pHinstantaneous minimum≥ 6.5 SUall year
pHinstantaneous minimum≥ 6.5 SUall year
pHinstantaneous maximum≤ 9 SUall year
pHinstantaneous maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendeddaily maximum≤ 90 mg/Lall year
Solids, total suspendeddaily maximum≤ 90 mg/Lall year
Durationmonthly totalreport only (d/mo)all year
Durationmonthly totalreport only (d/mo)all year
Flowdaily maximumreport only (MGD)all year
Flowdaily maximumreport only (MGD)all year
Flowmonthly averagereport only (MGD)all year
Flowmonthly averagereport only (MGD)all year
Flowweekly averagereport only (MGD)all year
Flowweekly averagereport only (MGD)all year
Chemical Oxygen Demand [COD]monthly average≤ 100 mg/Lall year
Chemical Oxygen Demand [COD]monthly average≤ 100 mg/Lall year
Chemical Oxygen Demand [COD]weekly average≤ 150 mg/Lall year
Chemical Oxygen Demand [COD]weekly average≤ 150 mg/Lall year
Chemical Oxygen Demand [COD]daily maximum≤ 300 mg/Lall year
Chemical Oxygen Demand [COD]daily maximum≤ 300 mg/Lall year
Produced water, oil and greasedaily maximum≤ 10 mg/Lall year
Produced water, oil and greasedaily maximum≤ 10 mg/Lall 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/WY0035700 · MCP: https://passage-data.com/mcp