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Montgomery County Public Service Authority

Sewage treatment plant, Riner, Virginia. NPDES permit VA0024040, in force until Sep 30, 2027. Last 12 months: over a limit 10 times (last February 2026), 1 of 13 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 10 days after each period: form M1 monthly (24 values), form S1 twice a year
Renewal application due
Apr 3, 2027 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
13 values over a limit, 0 required values missing, 0 of 14 reports late

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

Period endingParameterReportedLimitOver by
December 2025BOD, 5-day, 20 deg. C, maximum weekly average30≤ 28 mg/L7%
January 2026Nitrogen, Kjeldahl, total [as N], maximum weekly average3982≤ 2850 g/d40%
January 2026Nitrogen, ammonia total [as N], monthly average8.1≤ 2.9 mg/L179%
January 2026Nitrogen, ammonia total [as N], maximum weekly average25≤ 4.3 mg/L481%
February 2026Copper, total recoverable, monthly average19≤ 16 ug/L19%
February 2026Copper, total recoverable, maximum weekly average19≤ 16 ug/L19%
February 2026Nitrogen, Kjeldahl, total [as N], monthly average3822≤ 1900 g/d101%
February 2026Nitrogen, Kjeldahl, total [as N], maximum weekly average5234≤ 2850 g/d84%
February 2026Nitrogen, ammonia total [as N], monthly average41.2≤ 2.9 mg/L1321%
February 2026Nitrogen, ammonia total [as N], maximum weekly average55.7≤ 4.3 mg/L1195%

Limits in force (34)

ParameterStatisticLimitMonths
Temperature, water deg. centigrademaximumreport only (deg C)all year
Oxygen, dissolved [DO]daily minimum≥ 6.2 mg/LJun–Dec
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/LJan–May
BOD, 5-day, 20 deg. Cmonthly average≤ 19 mg/LJun–Dec
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 45 mg/LJan–May
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 28 mg/LJun–Dec
BOD, 5-day, 20 deg. Cmonthly average≤ 7500 g/dJan–May
BOD, 5-day, 20 deg. Cmonthly average≤ 7200 g/dJun–Dec
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 11250 g/dJan–May
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 11000 g/dJun–Dec
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 11000 g/dall year
Solids, total suspendedmaximum weekly average≤ 17000 g/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly average≤ 1.3 mg/LJun–Dec
Nitrogen, ammonia total [as N]monthly average≤ 2.9 mg/LJan–May
Nitrogen, ammonia total [as N]maximum weekly average≤ 1.9 mg/LJun–Dec
Nitrogen, ammonia total [as N]maximum weekly average≤ 4.3 mg/LJan–May
Nitrogen, Kjeldahl, total [as N]monthly average≤ 1900 g/dall year
Nitrogen, Kjeldahl, total [as N]maximum weekly average≤ 2850 g/dall year
Zinc, total recoverablemonthly average≤ 130 ug/Lall year
Zinc, total recoverablemaximum weekly average≤ 130 ug/Lall year
Copper, total recoverablemonthly average≤ 16 ug/Lall year
Copper, total recoverablemaximum weekly average≤ 16 ug/Lall year
Flow, in conduit or thru treatment plantmonthly average≤ .1 MGD (alert, not enforceable)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD) (alert, not enforceable)all year
BOD, percent removal [total]monthly average minimum≥ 85 %all year
E. coli30-day geometric mean≤ 126 #/100mLall year
E. colimaximum≤ 235 #/100mLall year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year

How strict are these limits?

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

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/VA0024040 · MCP: https://passage-data.com/mcp