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GCC Three Forks LLC

Cement, Hydraulic, Three Forks, Montana. NPDES permit MT0000485 expired Jul 31, 2024; its limits still apply. Last 12 months: over a limit 12 times (last September 2026), 3 of 19 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (24 values), form Q quarterly (2 values), form UP quarterly (6 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 1 of 20 reports late

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

Period endingParameterReportedLimitOver by
October 2025Nitrogen, total [as N], monthly average1.8 lb/d≤ 1 lb/d80%
February 2026Solids, total suspended, monthly average34 mg/L≤ 30 mg/L13%
April 2026E. coli, MTEC-MF, weekly maximum517 #/100mL≤ 252 #/100mL105%
July 2026E. coli, MTEC-MF, weekly maximum770 #/100mL≤ 252 #/100mL206%
July 2026Solids, total suspended, monthly average47 mg/L≤ 30 mg/L57%
July 2026Solids, total suspended, weekly average47 mg/L≤ 45 mg/L4%
August 2026Solids, total suspended, monthly average46 mg/L≤ 30 mg/L53%
August 2026Solids, total suspended, weekly average46 mg/L≤ 45 mg/L2%
September 2026Nitrogen, total [as N], monthly average1.5 lb/d≤ 1 lb/d50%
September 2026Solids, total suspended, monthly average2.6 lb/d≤ 1.8 lb/d44%
September 2026Solids, total suspended, monthly average68 mg/L≤ 30 mg/L127%
September 2026Solids, total suspended, weekly average68 mg/L≤ 45 mg/L51%

Limits in force (34)

ParameterStatisticLimitMonths
Temperature, water deg. centigrademonthly averagereport only (deg C)all year
Temperature, water deg. centigradeweekly maximumreport only (deg C)all year
Temperature, water deg. centigrademonthly averagereport only (deg C)all year
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
Flow ratedaily averagereport only (gal/d)all year
Flow ratemonthly maximumreport only (gal/d)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. Cmonthly average≤ 1.8 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 2.6 lb/dall year
pHinstantaneous minimum≥ 6 SUall year
pHinstantaneous maximum≤ 9 SUall year
pHinstantaneous minimumreport only (SU)all year
pHinstantaneous maximumreport only (SU)all year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 1.8 lb/dall year
Solids, total suspendedweekly average≤ 2.6 lb/dall year
Oil and grease, hexane extr methoddaily maximum≤ 10 mg/Lall year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, total [as N]monthly average≤ 1 lb/dall year
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]single samplereport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (lb/d)all year
Arsenic, total recoverablesingle samplereport only (mg/L)all year
Arsenic, total recoverablesingle samplereport only (ug/L)all year
E. coli, MTEC-MFmonthly average≤ 126 #/100mLApr–Oct
E. coli, MTEC-MFmonthly average≤ 630 #/100mLJan, Feb, Mar, Nov, Dec
E. coli, MTEC-MFweekly maximum≤ 252 #/100mLApr–Oct
E. coli, MTEC-MFweekly maximum≤ 1260 #/100mLJan, Feb, Mar, Nov, Dec
Oil and grease visualvaluereport only (Y=0;N=1)all year

How strict are these limits?

Cited limits by parameter: Montana'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/MT0000485 · MCP: https://passage-data.com/mcp