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NB Black Rock LLC

Sewerage Systems, Grottoes, Virginia. NPDES permit VA0088986, in force until Feb 28, 2031. Last 12 months: no values over a limit, 1 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 10 days after each period: form M1 monthly (23 values), form A1 yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
7 values over a limit, 0 required values missing, 2 of 12 reports late

Limits in force (29)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]minimum≥ 5 mg/Lall year
pHminimum≥ 6.5 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 20 mg/Lall year
Solids, total suspendedmaximum weekly average≤ 30 mg/Lall year
Solids, total suspendedmonthly average≤ 3 kg/dall year
Solids, total suspendedmaximum weekly average≤ 4.6 kg/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]weekly averagereport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]monthly average≤ 3 mg/Lall year
Nitrogen, Kjeldahl, total [as N]maximum weekly average≤ 4.5 mg/Lall year
Nitrogen, Kjeldahl, total [as N]monthly average≤ .45 kg/dall year
Nitrogen, Kjeldahl, total [as N]maximum weekly average≤ .68 kg/dall year
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Flow, in conduit or thru treatment plantmonthly average≤ .04 MGD (alert, not enforceable)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD) (alert, not enforceable)all year
Chlorine, total residualmonthly average≤ .008 mg/Lall year
Chlorine, total residualmaximum weekly average≤ .0098 mg/Lall year
Chlorine, total residualinstantaneous minimum≥ .6 mg/Lall year
E. coligeometric mean≤ 126 #/100mLall year
Phosphorus, Total As Pannual maximum≤ 138.2 kg/yrall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/Lall year
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 15 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 1.5 kg/dall year
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 2.3 kg/dall year
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year
BOD, carb-5 day, 20 deg C, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year

New limits from Mar 1, 2030

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Nitrogen, ammonia total [as N], monthly average1.8 mg/Lnew0.2 mg/L (6 values)0.111×
Nitrogen, ammonia total [as N], weekly average1.8 mg/Lnew0.2 mg/L (6 values)0.111×

How strict are these limits?

Cited limits by parameter: Virginia'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/VA0088986 · MCP: https://passage-data.com/mcp