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Chatham Town - Sewage Treatmen

Sewage treatment plant, Chatham, Virginia. NPDES permit VA0020524, in force until Mar 31, 2029. Last 12 months: over a limit once (last January 2026), 1 of 13 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 10 days after each period: form M1 monthly (20 values), form S1 twice a year
Last report on file
August 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 1 of 14 reports late

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

Period endingParameterReportedLimitOver by
January 2026Nitrogen, ammonia total [as N], monthly average< 9≤ 6.3 mg/L43%

Limits in force (26)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]minimum≥ 7 mg/Lall year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 77.8 kg/dall year
Solids, total suspendedweekly average≤ 116.7 kg/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly average≤ 6.3 mg/Lall year
Nitrogen, ammonia total [as N]weekly average≤ 20 mg/Lall year
Nitrogen, Kjeldahl, total [as N]monthly average≤ 15 mg/Lall year
Nitrogen, Kjeldahl, total [as N]weekly average≤ 22.5 mg/Lall year
Nitrogen, Kjeldahl, total [as N]monthly average≤ 38.9 kg/dall year
Nitrogen, Kjeldahl, total [as N]weekly average≤ 58.3 kg/dall year
Hardness, total [as CaCO3]monthly averagereport only (mg/L)all year
Hardness, total [as CaCO3]weekly averagereport only (mg/L)all year
Flow, in conduit or thru treatment plantmonthly average≤ .685 MGD (alert, not enforceable)all year
Flow, in conduit or thru treatment plantweekly averagereport only (MGD) (alert, not enforceable)all year
E. coligeometric mean≤ 126 #/100mLall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 37.5 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 64.8 kg/dall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 97.2 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

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/VA0020524 · MCP: https://passage-data.com/mcp