River Cleanup Budgets

Collates budget figures from media/official sources and compares with international cases by order of magnitude.

Tainan – Local budgets

• Erren River cleanup, phase 2: four basin sites — NT$1,300,000,000 (2025-07-22)
• NT$1.3B approved: Erren cleanup phase 2 to remove 22,000 tons — NT$1,300,000,000 (2025-07-22)

Global comparators (order of magnitude)

• Paris Seine cleanup (sanitation upgrades) — €1.4 billion (approx)
• London Thames Tideway Tunnel — £4–5 billion scale
• US EPA – Gowanus Canal Superfund cleanup — ~US$1–2 billion scale (phased)

Note: Global figures are order-of-magnitude from public sources and vary by currency and year; follow-up calibration with project/annual reports is recommended.