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

Poplar, Town of

Sewage treatment plant, Poplar, Montana. NPDES permit MT0030597 expired Jun 30, 2025; its limits still apply. Last 12 months: no values over a limit, 58 required values missing, 4 of 13 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A quarterly (24 values), form W quarterly (2 values), form Y yearly
Last report on file
June 2026
Oct 2024 – Sep 2025
6 values over a limit, 34 required values missing, 13 of 17 reports late

Limits in force (38)

ParameterStatisticLimitMonths
Temperature, water deg. centigradedaily maximumreport only (deg C)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
BOD, 5-day, 20 deg. C30-day averagereport only (mg/L)all year
BOD, 5-day, 20 deg. C7-day averagereport only (mg/L)all year
pHminimum≥ 6.5 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspended30-day average≤ 30 mg/Lall year
Solids, total suspended7-day average≤ 45 mg/Lall year
Solids, total suspended30-day averagereport only (mg/L)all year
Solids, total suspended7-day averagereport only (mg/L)all year
Oil & Greasedaily maximum≤ 10 mg/Lall year
Nitrogen, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all year
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]7-day averagereport only (mg/L)all year
Arsenic, total [as As]daily maximumreport only (ug/L)all year
Cadmium, total [as Cd]daily maximumreport only (ug/L)all year
Chromium, total [as Cr]daily maximumreport only (ug/L)all year
Copper, total [as Cu]daily maximumreport only (ug/L)all year
Lead, total [as Pb]daily maximumreport only (ug/L)all year
Nickel, total [as Ni]daily maximumreport only (ug/L)all year
Silver, total [as Ag]daily maximumreport only (ug/L)all year
Zinc, total [as Zn]daily maximumreport only (ug/L)all year
Selenium, total [as Se]daily maximumreport only (ug/L)all year
Floating solids, waste or visible foam-visualinstantaneous maximumreport only (N=0;Y=1)all year
E. coli30-day geometric mean≤ 126 #/100mLApr–Oct
E. coli30-day geometric mean≤ 126 #/100mLJan, Feb, Mar, Nov, Dec
E. colidaily maximum≤ 235 #/100mLApr–Oct
E. colidaily maximum≤ 410 #/100mLJan, Feb, Mar, Nov, Dec
Mercury, total [as Hg]daily maximumreport only (ug/L)all year
BOD, 5-day, percent removalminimum≥ 85 %all year
Solids, suspended percent removalminimum≥ 85 %all year
Flow, total30-day averagereport only (MGD)all year
Flow, totaldaily maximumreport only (MGD)all year
Static Renewal 96Hr Acute Pimephales promelasdaily maximumreport only (tox acute)all year
Toxic Units Static Renewal 48Hr Acute Ceriodaphnia dubiadaily maximumreport only (tox acute)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/MT0030597 · MCP: https://passage-data.com/mcp