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Cheyenne Board of Public Utilities

Water Supply, Cheyenne, Wyoming. NPDES permit WY0031721, in force until Jun 30, 2030. Last 12 months: over a limit 7 times (last January 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due: About 28 days after each period: outfall 005 form MQ quarterly (10 values), outfall DMP1 form MQ quarterly (1 value)
Last report on file: September 2026
Oct 2024 – Sep 2025: 13 values over a limit, 0 required values missing, 0 of 84 reports late

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

Period ending	Parameter	Reported	Limit	Over by
November 2025	Solids, total suspended, daily maximum	92.5 mg/L	≤ 45 mg/L	106%
November 2025	Solids, total suspended, monthly average	78.25 mg/L	≤ 20 mg/L	291%
November 2025	Solids, total suspended, weekly average	78.25 mg/L	≤ 30 mg/L	161%
December 2025	Solids, total suspended, daily maximum	110 mg/L	≤ 45 mg/L	144%
December 2025	Solids, total suspended, monthly average	110 mg/L	≤ 20 mg/L	450%
December 2025	Solids, total suspended, weekly average	110 mg/L	≤ 30 mg/L	267%
January 2026	Solids, total suspended, monthly average	22 mg/L	≤ 20 mg/L	10%

Limits in force (11)

Parameter	Statistic	Limit	Months	Outfall
pH	instantaneous minimum	≥ 6.5 SU	all year	005
pH	instantaneous maximum	≤ 9 SU	all year	005
Solids, total suspended	monthly average	≤ 20 mg/L	all year	005
Solids, total suspended	weekly average	≤ 30 mg/L	all year	005
Solids, total suspended	daily maximum	≤ 45 mg/L	all year	005
Trichloroethylene	daily maximum	≤ 2.5 ug/L	all year	005
Duration	monthly total	report only (d/mo)	all year	005
Chlorine, total residual	daily maximum	≤ .011 mg/L	all year	005
Flow, total	monthly average	report only (MGD)	all year	005
Flow, total	daily maximum	report only (MGD)	all year	005
Trichloroethylene	daily maximum	report only (ug/L)	all year	DMP1

How strict are these limits?

Trichloroethylene, daily maximum 2.5 ug/L — stricter than 94% of 155 other minor industrial and other permits nationwide; 1% have the same limit
Solids, total suspended, monthly average 20 mg/L — stricter than 80% of 80 other minor industrial and other permits in Wyoming; 20% have the same limit
Solids, total suspended, weekly average 30 mg/L — stricter than 77% of 58 other minor industrial and other permits in Wyoming; 22% have the same limit

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

Same industry: the 5 Water Supply permits in Wyoming.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/WY0031721 · MCP: https://passage-data.com/mcp