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Peace Valley Hot Springs

Sewerage Systems, Boulder, Montana. NPDES permit MT0023639 expired Nov 30, 2020; its limits still apply. Last 12 months: over a limit 2 times (last January 2026), 2 of 16 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (21 values), form Q quarterly (3 values), form S twice a year
Last report on file
August 2026
Oct 2024 – Sep 2025
1 value over a limit, 6 required values missing, 4 of 18 reports late

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

Period endingParameterReportedLimitOver by
January 2026Solids, total suspended, monthly average100 mg/L≤ 45 mg/L122%
January 2026Solids, total suspended, weekly average100 mg/L≤ 65 mg/L54%

Limits in force (30)

ParameterStatisticLimitMonths
Temperature, water deg. centigrademonthly maximumreport only (deg C)all year
Flow ratemonthly averagereport only (MGD)all year
Flow ratedaily maximumreport only (MGD)all year
Flow ratemonthly averagereport only (MGD)all year
Flow ratedaily maximumreport only (MGD)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 averagereport only (lb/d)all year
pHminimumreport only (SU)all year
pHmaximumreport only (SU)all year
Solids, total suspendedmonthly average≤ 45 mg/Lall year
Solids, total suspendedweekly average≤ 65 mg/Lall year
Solids, total suspendedmonthly averagereport only (lb/d)all year
Oil and grease, hexane extr methodmaximum≤ 10 mg/Lall year
Nitrogen, total [as N]monthly averagereport only (mg/L)Jul–Sep
Nitrogen, total [as N]monthly average≤ 1.45 lb/dJul–Sep
Nitrogen, ammonia total [as N]monthly average≤ 2.9 mg/Lall year
Nitrogen, ammonia total [as N]maximum weekly average≤ 7.4 mg/Lall year
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)Jul–Sep
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)Jul–Sep
Phosphorus, total [as P]monthly averagereport only (mg/L)Jul–Sep
Phosphorus, total [as P]monthly average≤ .12 lb/dJul–Sep
Iron, total recoverabledaily maximumreport only (ug/L)all year
Aluminum, dissolved [as Al]daily maximumreport only (ug/L)all year
Lead, total recoverabledaily maximumreport only (ug/L)all year
Copper, total recoverabledaily maximumreport only (ug/L)all year
E. coli, MTEC-MFmonthly average≤ 630 CFU/100mLJan, Feb, Mar, Nov, Dec
E. coli, MTEC-MFmonthly average≤ 126 CFU/100mLApr–Oct
E. coli, MTEC-MFdaily maximum≤ 1260 CFU/100mLJan, Feb, Mar, Nov, Dec
E. coli, MTEC-MFdaily maximum≤ 252 CFU/100mLApr–Oct

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/MT0023639 · MCP: https://passage-data.com/mcp