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Environmental Management & Industrial Hygiene, WMATA

Local And Suburban Transit, Largo, Maryland. NPDES permit MD0069774, in force until Sep 30, 2027. Last 12 months: over a limit 2 times (last March 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due: About 28 days after each period: form A quarterly (8 values)
Renewal application due: Apr 3, 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 12 reports late

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

Period ending	Parameter	Reported	Limit	Over by
March 2026	Iron, total [as Fe], daily maximum	3.43 mg/L	≤ 3 mg/L	14%
March 2026	Iron, total [as Fe], maximum monthly average	2.17 mg/L	≤ 2 mg/L	9%

Limits in force (8)

Parameter	Statistic	Limit	Months
pH	minimum	≥ 6.5 SU	all year
pH	daily maximum	≤ 8.5 SU	all year
Solids, total suspended	maximum monthly average	≤ 20 mg/L	all year
Solids, total suspended	daily maximum	≤ 30 mg/L	all year
Iron, total [as Fe]	maximum monthly average	≤ 2 mg/L	all year
Iron, total [as Fe]	daily maximum	≤ 3 mg/L	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

How strict are these limits?

pH, daily maximum 8.5 SU — stricter than 89% of 6,223 other minor industrial and other permits nationwide; 10% have the same limit
Solids, total suspended, maximum monthly average 20 mg/L — stricter than 72% of 99 other minor industrial and other permits in Maryland; 18% have the same limit
Iron, total [as Fe], daily maximum 3 mg/L — stricter than 67% of 1,411 other minor industrial and other permits nationwide; 18% have the same limit

Cited limits by parameter: Maryland'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/MD0069774 · MCP: https://passage-data.com/mcp