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Montgomery County Government, Department of General Services

Nonresidential Building Operators, Gaithersburg, Maryland. NPDES permit MD0068195, in force until Dec 31, 2027. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due: About 28 days after each period: form Q quarterly (8 values)
Renewal application due: Jul 4, 2027 · 180 days before expiry; your permit may set another date
Last report on file: June 2026
Oct 2024 – Sep 2025: 0 values over a limit, 0 required values missing, 0 of 4 reports late

Limits in force (8)

Parameter	Statistic	Limit	Months
pH	minimum	≥ 6.5 SU	all year
pH	maximum	≤ 8.5 SU	all year
Temp. diff. between up/down stream deg. F	monthly average	report only (deg F)	all year
Temp. diff. between up/down stream deg. F	daily maximum	≤ 0 deg F	all year
Flow, in conduit or thru treatment plant	monthly average	report only (gal/d)	all year
Flow, in conduit or thru treatment plant	daily maximum	report only (gal/d)	all year
Chlorine, total residual	monthly average	≤ .1 mg/L	all year
Chlorine, total residual	daily maximum	≤ .1 mg/L	all year

How strict are these limits?

Chlorine, total residual, monthly average .1 mg/L — stricter than 47% of 2,336 other minor industrial and other permits nationwide; 2% have the same limit
pH, minimum at least 6.5 SU — stricter than 15% of 145 other minor industrial and other permits in Maryland; 84% have the same limit
pH, maximum 8.5 SU — stricter than 12% of 132 other minor industrial and other permits in Maryland; 81% have the same limit

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

Same industry: the 9 Real Estate permits in Maryland.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MD0068195 · MCP: https://passage-data.com/mcp