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Guam Waterworks Authority

Sewage treatment plant, Talofofo, Guam. NPDES permit GU0020371, in force until Nov 30, 2026. Last 12 months: no values over a limit, 5 of 15 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due

About 28 days after each period: outfall 001 form A quarterly (34 values), outfall UR1 form Q quarterly (9 values), outfall UR2 form Q quarterly (9 values)

Renewal application due

Jun 3, 2026 · 180 days before expiry; your permit may set another date

Last report on file

June 2026

Oct 2024 – Sep 2025

2 values over a limit, 0 required values missing, 0 of 21 reports late

Limits in force (52)

How strict are these limits?

• Chlorine, total residual, monthly average .05 ug/L — stricter than 99% of 212 other minor POTWs nationwide
• Chlorine, total residual, daily maximum .05 ug/L — stricter than 99% of 365 other minor POTWs nationwide
• pH, instantaneous minimum at least 6.5 SU — stricter than 85% of 1,111 other minor POTWs nationwide; 14% have the same limit

Cited limits by parameter: we hold no rule of Guam's own; the federal ones.

On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/GU0020371 · MCP: https://passage-data.com/mcp