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Hot Springs, Town of

Sewage treatment plant, Hot Springs, Montana. NPDES permit MT0020591 expired Jun 30, 2023; its limits still apply. Last 12 months: over a limit 6 times (last August 2026), 2 of 36 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (22 values), form Q quarterly (6 values), form R monthly (5 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
12 values over a limit, 12 required values missing, 12 of 36 reports late

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

Period endingParameterReportedLimitOver by
October 2025E. coli, 7-day geometric mean435 #/100mL≤ 252 #/100mL73%
November 2025E. coli, 7-day geometric mean461 #/100mL≤ 252 #/100mL83%
December 2025Coliform, fecal general, 7-day geometric mean1550 #/100mL≤ 400 #/100mL288%
December 2025E. coli, 7-day geometric mean1730 #/100mL≤ 252 #/100mL587%
March 2026E. coli, 7-day geometric mean1410 #/100mL≤ 252 #/100mL460%
August 2026E. coli, 7-day geometric mean260 #/100mL≤ 252 #/100mL3%

Limits in force (33)

ParameterStatisticLimitMonths
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
Oxygen, dissolved [DO]daily maximumreport only (mg/L)all year
BOD, 5-day, 20 deg. C30-day average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. C7-day average≤ 45 mg/Lall year
pHminimum≥ 6.5 SUall year
pHmaximum≤ 9 SUall year
pHminimumreport only (SU)all year
pHmaximumreport only (SU)all year
Solids, total suspended30-day average≤ 30 mg/Lall year
Solids, total suspended7-day average≤ 45 mg/Lall year
Oil & Greasedaily maximum≤ 10 mg/Lall year
Nitrogen, ammonia total [as N]30-day averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]30-day averagereport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all year
Nitrite + Nitrate total [as N]30-day averagereport only (mg/L)all year
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]30-day averagereport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Floating solids, waste or visible foam-visualinstantaneous maximum≤ 0 N=0;Y=1all year
Flow, in conduit or thru treatment plant30-day averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residual30-day average≤ .11 mg/Lall year
Chlorine, total residualdaily maximum≤ .19 mg/Lall year
E. coli30-day geometric mean≤ 126 #/100mLall year
E. coli7-day geometric mean≤ 252 #/100mLall year
Date of Sample Collectionvaluereport only (date)all year
Time of Sample Collectionvaluereport only (time)all year
Solids, total dissolved30-day averagereport only (mg/L)all year
Solids, total dissolveddaily maximumreport only (mg/L)all year
Coliform, fecal general30-day geometric mean≤ 200 #/100mLall year
Coliform, fecal general7-day geometric mean≤ 400 #/100mLall year
Oil and grease visualinstantaneous maximum≤ 0 N=0;Y=1all year

How strict are these limits?

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

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MT0020591 · MCP: https://passage-data.com/mcp