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Northern Cheyenne Utilities Commission

Sewage treatment plant, Lame Deer, Montana. NPDES permit MT0029360, in force until Jun 30, 2029. Last 12 months: over a limit 64 times (last June 2026), 234 required values missing, 15 of 20 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form M monthly (32 values), outfall 001I form M monthly (2 values)
Last report on file
July 2026
Oct 2024 – Sep 2025
156 values over a limit, 408 required values missing, 24 of 24 reports late

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

All 64 values over a limit
Period endingParameterReportedLimitOver by
October 2025E. coli, 30-day geometric mean5172 #/100mL≤ 126 #/100mL4005%
October 2025E. coli, 30-day geometric mean5172 #/100mL≤ 126 #/100mL4005%
October 2025E. coli, daily maximum5172 #/100mL≤ 406 #/100mL1174%
October 2025E. coli, daily maximum5172 #/100mL≤ 406 #/100mL1174%
October 2025Nitrogen, ammonia total [as N], 30-day average9.6 mg/L≤ 1.17 mg/L721%
October 2025Nitrogen, ammonia total [as N], 30-day average9.6 mg/L≤ 1.17 mg/L721%
October 2025Nitrogen, ammonia total [as N], daily maximum9.6 mg/L≤ 2.31 mg/L316%
October 2025Nitrogen, ammonia total [as N], daily maximum9.6 mg/L≤ 2.31 mg/L316%
October 2025Oil and grease visual, instantaneous maximum1 N=0;Y=1≤ 0 N=0;Y=1—
October 2025Oil and grease visual, instantaneous maximum1 N=0;Y=1≤ 0 N=0;Y=1—
October 2025Oxygen, dissolved [DO], daily minimum.1 mg/L≥ 5 mg/L98%
October 2025Oxygen, dissolved [DO], daily minimum.1 mg/L≥ 5 mg/L98%
October 2025Oxygen, dissolved [DO], minimum 7-day average.7 mg/L≥ 6.5 mg/L89%
October 2025Oxygen, dissolved [DO], minimum 7-day average.7 mg/L≥ 6.5 mg/L89%
November 2025Nitrogen, ammonia total [as N], 30-day average11.9 mg/L≤ 1.17 mg/L917%
November 2025Nitrogen, ammonia total [as N], 30-day average11.9 mg/L≤ 1.17 mg/L917%
November 2025Nitrogen, ammonia total [as N], daily maximum11.9 mg/L≤ 2.31 mg/L415%
November 2025Nitrogen, ammonia total [as N], daily maximum11.9 mg/L≤ 2.31 mg/L415%
November 2025Oil and grease visual, instantaneous maximum1 N=0;Y=1≤ 0 N=0;Y=1—
November 2025Oil and grease visual, instantaneous maximum1 N=0;Y=1≤ 0 N=0;Y=1—
November 2025Oxygen, dissolved [DO], daily minimum.7 mg/L≥ 5 mg/L86%
November 2025Oxygen, dissolved [DO], daily minimum.7 mg/L≥ 5 mg/L86%
November 2025Oxygen, dissolved [DO], minimum 7-day average1.7 mg/L≥ 6.5 mg/L74%
November 2025Oxygen, dissolved [DO], minimum 7-day average1.7 mg/L≥ 6.5 mg/L74%
November 2025pH, minimum1.95 SU≥ 6.5 SU—
December 2025E. coli, 30-day geometric mean26130 #/100mL≤ 126 #/100mL20638%
December 2025E. coli, daily maximum26130 #/100mL≤ 406 #/100mL6336%
December 2025Nitrogen, ammonia total [as N], 30-day average12.6 mg/L≤ 1.17 mg/L977%
December 2025Nitrogen, ammonia total [as N], daily maximum12.6 mg/L≤ 2.31 mg/L445%
December 2025Oil and grease visual, instantaneous maximum1 Y=0;N=1≤ 0 N=0;Y=1—
December 2025Oxygen, dissolved [DO], daily minimum.9 mg/L≥ 5 mg/L82%
December 2025Oxygen, dissolved [DO], minimum 7-day average3.1 mg/L≥ 6.5 mg/L52%
December 2025pH, minimum2.08 SU≥ 6.5 SU—
January 2026BOD, 5-day, 20 deg. C, 30-day average40 mg/L≤ 30 mg/L33%
January 2026BOD, 5-day, 20 deg. C, 30-day average40 mg/L≤ 30 mg/L33%
January 2026E. coli, 30-day geometric mean104620 #/100mL≤ 126 #/100mL82932%
January 2026E. coli, 30-day geometric mean104620 #/100mL≤ 126 #/100mL82932%
January 2026E. coli, daily maximum104620 #/100mL≤ 406 #/100mL25668%
January 2026E. coli, daily maximum104620 #/100mL≤ 406 #/100mL25668%
January 2026Nitrogen, ammonia total [as N], 30-day average15.5 mg/L≤ 1.17 mg/L1225%
January 2026Nitrogen, ammonia total [as N], 30-day average15.5 mg/L≤ 1.17 mg/L1225%
January 2026Nitrogen, ammonia total [as N], daily maximum15.5 mg/L≤ 2.31 mg/L571%
January 2026Nitrogen, ammonia total [as N], daily maximum15.5 mg/L≤ 2.31 mg/L571%
March 2026Oil and grease visual, instantaneous maximum1 Y=0;N=1≤ 0 N=0;Y=1—
March 2026Oxygen, dissolved [DO], daily minimum2.7 mg/L≥ 5 mg/L46%
April 2026E. coli, 30-day geometric mean5380 #/100mL≤ 126 #/100mL4170%
April 2026E. coli, daily maximum5380 #/100mL≤ 406 #/100mL1225%
April 2026Nitrogen, ammonia total [as N], 30-day average7.9 mg/L≤ 1.17 mg/L575%
April 2026Nitrogen, ammonia total [as N], daily maximum7.9 mg/L≤ 2.31 mg/L242%
April 2026Solids, suspended percent removal, monthly average minimum27 %≥ 65 %109%
April 2026Solids, total suspended, 30-day average48 mg/L≤ 30 mg/L60%
April 2026Solids, total suspended, 7-day average48 mg/L≤ 45 mg/L7%
May 2026Nitrogen, ammonia total [as N], 30-day average7.5 mg/L≤ 1.17 mg/L541%
May 2026Nitrogen, ammonia total [as N], daily maximum7.5 mg/L≤ 2.31 mg/L225%
May 2026Oil and grease visual, instantaneous maximum1 Y=0;N=1≤ 0 N=0;Y=1—
May 2026Oxygen, dissolved [DO], daily minimum1.21 mg/L≥ 5 mg/L76%
May 2026Oxygen, dissolved [DO], minimum 7-day average5.6 mg/L≥ 6.5 mg/L14%
May 2026Temperature, water deg. centigrade, daily maximum21.1 deg C≤ 20 deg C6%
June 2026E. coli, 30-day geometric mean200 #/100mL≤ 126 #/100mL59%
June 2026Nitrogen, ammonia total [as N], 30-day average.78 mg/L≤ .64 mg/L22%
June 2026Oxygen, dissolved [DO], daily minimum.82 mg/L≥ 5 mg/L84%
June 2026Oxygen, dissolved [DO], minimum 7-day average.82 mg/L≥ 6.5 mg/L87%
June 2026Solids, suspended percent removal, monthly average minimum53 %≥ 65 %34%
June 2026pH, maximum14 SU≤ 9 SU—

Limits in force (36)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigrade30-day averagereport only (deg C)all year001
Temperature, water deg. centigradedaily maximum≤ 20 deg Call year001
Oxygen, dissolved [DO]daily minimum≥ 5 mg/Lall year001
Oxygen, dissolved [DO]minimum 7-day average≥ 6.5 mg/Lall year001
BOD, 5-day, 20 deg. C30-day average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. C7-day average≤ 45 mg/Lall year001
pHminimum≥ 6.5 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspended30-day average≤ 30 mg/Lall year001
Solids, total suspended7-day average≤ 45 mg/Lall year001
Oil & Greasedaily maximum≤ 10 mg/Lall year001
Nitrogen, total [as N]30-day averagereport only (mg/L)all year001
Nitrogen, total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, ammonia total [as N]30-day average≤ 1.17 mg/LJan, Feb, Mar, Apr, May, Sep, Oct, Nov, Dec001
Nitrogen, ammonia total [as N]30-day average≤ .64 mg/LJun–Aug001
Nitrogen, ammonia total [as N]daily maximum≤ 2.31 mg/LJan, Feb, Mar, Apr, May, Sep, Oct, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 2.14 mg/LJun–Aug001
Nitrite + Nitrate total [as N]30-day averagereport only (mg/L)all year001
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all year001
Phosphorus, total [as P]30-day averagereport only (mg/L)all year001
Phosphorus, total [as P]daily maximumreport only (mg/L)all year001
Chlorine, total residual30-day average≤ .05 mg/Lall year001
Chlorine, total residualdaily maximum≤ .05 mg/Lall year001
E. coli30-day geometric mean≤ 126 #/100mLall year001
E. colidaily maximum≤ 406 #/100mLall year001
Nitrogen, Kjeldahl Total30-day averagereport only (mg/L)all year001
Nitrogen, Kjeldahl Totaldaily maximumreport only (mg/L)all year001
Solids, total dissolved [TDS]30-day averagereport only (mg/L)all year001
Solids, total dissolved [TDS]daily maximumreport only (mg/L)all year001
BOD, 5-day, percent removalmonthly average minimum≥ 65 %all year001
Solids, suspended percent removalmonthly average minimum≥ 65 %all year001
Flow, total30-day averagereport only (MGD)all year001
Flow, totaldaily maximumreport only (MGD)all year001
Oil and grease visualinstantaneous maximum≤ 0 N=0;Y=1all year001
BOD, 5-day, 20 deg. C30-day averagereport only (mg/L)all year001I
Solids, total suspended30-day averagereport only (mg/L)all year001I

How strict are these limits?

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

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Your permit document is the final word. As JSON: /api/v1/permits/MT0029360 · MCP: https://passage-data.com/mcp