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Central Wyoming Regional Water System

Water Supply, Casper, Wyoming. NPDES permit WY0097018, in force until Feb 28, 2029. Last 12 months: no values over a limit, 4 of 20 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form MQ quarterly (18 values), outfall 002 form MQ quarterly (18 values), outfall 001 form MA yearly, outfall 002 form MA yearly
Last report on file
June 2026
Oct 2024 – Sep 2025
0 values over a limit, 36 required values missing, 8 of 16 reports late

Limits in force (42)

ParameterStatisticLimitMonthsOutfall
pHinstantaneous minimum≥ 6.5 SUall year001
pHinstantaneous minimum≥ 6.5 SUall year001
pHinstantaneous maximum≤ 9 SUall year001
pHinstantaneous maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 20 mg/Lall year001
Solids, total suspendedmonthly average≤ 20 mg/Lall year001
Solids, total suspendedweekly average≤ 30 mg/Lall year001
Solids, total suspendedweekly average≤ 30 mg/Lall year001
Solids, total suspendeddaily maximumreport only (mg/L)all year001
Solids, total suspendeddaily maximumreport only (mg/L)all year001
Selenium, total [as Se]daily maximumreport only (ug/L)all year001
Durationmonthly totalreport only (d)all year001
Durationmonthly totalreport only (d)all year001
Chlorine, total residualdaily maximum≤ 1.4 mg/LJan, Feb, Mar, Apr, Oct, Nov, Dec001
Chlorine, total residualdaily maximum≤ 1.4 mg/LJan, Feb, Mar, Apr, Oct, Nov, Dec001
Chlorine, total residualdaily maximum≤ 1 mg/LMay–Sep001
Chlorine, total residualdaily maximum≤ 1 mg/LMay–Sep001
Flowmonthly average≤ 2 MGDall year001
Flowmonthly average≤ 2 MGDall year001
Flowdaily maximumreport only (MGD)all year001
Flowdaily maximumreport only (MGD)all year001
pHinstantaneous minimum≥ 6.5 SUall year002
pHinstantaneous minimum≥ 6.5 SUall year002
pHinstantaneous maximum≤ 9 SUall year002
pHinstantaneous maximum≤ 9 SUall year002
Solids, total suspendedmonthly average≤ 20 mg/Lall year002
Solids, total suspendedmonthly average≤ 20 mg/Lall year002
Solids, total suspendedweekly average≤ 30 mg/Lall year002
Solids, total suspendedweekly average≤ 30 mg/Lall year002
Solids, total suspendeddaily maximumreport only (mg/L)all year002
Solids, total suspendeddaily maximumreport only (mg/L)all year002
Selenium, total [as Se]daily maximumreport only (ug/L)all year002
Durationmonthly totalreport only (d)all year002
Durationmonthly totalreport only (d)all year002
Chlorine, total residualdaily maximum≤ 1.4 mg/LJan, Feb, Mar, Apr, Oct, Nov, Dec002
Chlorine, total residualdaily maximum≤ 1.4 mg/LJan, Feb, Mar, Apr, Oct, Nov, Dec002
Chlorine, total residualdaily maximum≤ 1 mg/LMay–Sep002
Chlorine, total residualdaily maximum≤ 1 mg/LMay–Sep002
Flowmonthly average≤ 2 MGDall year002
Flowmonthly average≤ 2 MGDall year002
Flowdaily maximumreport only (MGD)all year002
Flowdaily maximumreport only (MGD)all year002

How strict are these limits?

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/WY0097018 · MCP: https://passage-data.com/mcp