Passage Data · Check a report · Use it from your AI

Town of Sunburst

Sewage treatment plant, Sunburst, Montana. NPDES permit MT0021679 expired Jun 30, 2023; its limits still apply. Last 12 months: over a limit 15 times (last April 2026), 3 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (20 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
2 values over a limit, 4 required values missing, 1 of 12 reports late

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

All 15 values over a limit
Period endingParameterReportedLimitOver by
January 2026BOD, 5-day, 20 deg. C, daily maximum30.46 lb/d≤ 19 lb/d60%
January 2026BOD, 5-day, 20 deg. C, monthly average30.46 mg/L≤ 30 mg/L2%
January 2026Solids, suspended percent removal, minimum53 %≥ 65 %34%
January 2026Solids, total suspended, daily maximum51.21 lb/d≤ 28 lb/d83%
January 2026Solids, total suspended, monthly average33.36 lb/d≤ 19 lb/d76%
April 2026BOD, 5-day, 20 deg. C, daily maximum37 lb/d≤ 19 lb/d95%
April 2026BOD, 5-day, 20 deg. C, daily maximum59.1 mg/L≤ 45 mg/L31%
April 2026BOD, 5-day, 20 deg. C, monthly average16.2 lb/d≤ 13 lb/d25%
April 2026BOD, 5-day, 20 deg. C, monthly average37 mg/L≤ 30 mg/L23%
April 2026BOD, 5-day, percent removal, minimum71 %≥ 85 %93%
April 2026Solids, suspended percent removal, minimum28 %≥ 65 %106%
April 2026Solids, total suspended, daily maximum132.2 lb/d≤ 28 lb/d372%
April 2026Solids, total suspended, daily maximum270 mg/L≤ 135 mg/L100%
April 2026Solids, total suspended, monthly average132.2 mg/L≤ 100 mg/L32%
April 2026Solids, total suspended, monthly average74.2 lb/d≤ 19 lb/d291%

Limits in force (20)

ParameterStatisticLimitMonths
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. Cdaily maximum≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 13 lb/dall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 19 lb/dall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year
pHinstantaneous minimum≥ 6 SUall year
pHinstantaneous maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 100 mg/Lall year
Solids, total suspendeddaily maximum≤ 135 mg/Lall year
Solids, total suspendedmonthly average≤ 19 lb/dall year
Solids, total suspendeddaily maximum≤ 28 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
E. coli, MTEC-MFmonthly geometric meanreport only (#/100mL)all year
E. coli, MTEC-MFmaximum weekly averagereport only (#/100mL)all year
Durationtotalreport only (d/mo)all year
BOD, 5-day, percent removalminimum≥ 85 %all year
Solids, suspended percent removalminimum≥ 65 %all 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

· Save this facility as a site · Superfund sites nearby · Your permits on one board

On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MT0021679 · MCP: https://passage-data.com/mcp