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Mountain Cement Company LLC

Miscellaneous Nonmetallic Minerals, Laramie, Wyoming. NPDES permit WY0097037, in force until Jun 30, 2031. No reports in EPA's file for the last 12 months. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form MD quarterly, outfall 001 form MQ quarterly, outfall 001 form QM quarterly, outfall IR01 form WQ quarterly, outfall IR02 form WQ quarterly
Last report on file
None in EPA's file for the last 12 months; that may be EPA's gap, not the facility's

Limits in force (29)

ParameterStatisticLimitMonthsOutfall
Specific conductancedaily maximumreport only (umho/cm)all year001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year001
pHinstantaneous minimum≥ 6.5 SUall year001
pHinstantaneous maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Calcium, dissolved [as Ca]daily maximumreport only (mg/L)all year001
Magnesium, dissolved [as Mg]daily maximumreport only (mg/L)all year001
Sodium, dissolved [as Na]daily maximumreport only (mg/L)all year001
Sodium adsorption ratiodaily maximumreport only (Ratio)all year001
Durationmonthly totalreport only (d/mo)all year001
Durationmonthly totalreport only (d/mo)all year001
Nitrogen, Ammonia Totaldaily maximum≤ 5.5 mg/Lall year001
Solids, total dissolveddaily maximum≤ 5000 mg/Lall year001
Flowmonthly averagereport only (MGD)all year001
Flowmonthly averagereport only (MGD)all year001
Flowdaily maximumreport only (MGD)all year001
Flowdaily maximumreport only (MGD)all year001
Sulfatedaily maximum≤ 2000 mg/Lall year001
Produced water, oil and greasedaily maximum≤ 10 mg/Lall year001
Priority pollutants scan [yes/no]valuereport only (Y=0;N=1)all yearIR01
Priority pollutants scan [yes/no]valuereport only (Y=0;N=1)all yearIR01
Priority pollutants scan [yes/no]valuereport only (Y=0;N=1)all yearIR02
Priority pollutants scan [yes/no]valuereport only (Y=0;N=1)all yearIR02

How strict are these limits?

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

Same industry: the 8 Mining and Quarrying of Nonmetallic Minerals 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/WY0097037 · MCP: https://passage-data.com/mcp