The "Working Waterfront Disaster Mitigation Tax Credit Act" aims to create a tax credit for investments in projects designed to prevent or mitigate damage to working waterfront property from natural hazards. The tax credit equals 30% of the qualified investment, capped at $300,000 per taxpayer, and has a 10-year limitation. "Eligible property" for the credit includes tangible property undergoing specific disaster mitigation methods. The bill also defines "qualifying working waterfront disaster mitigation project" and sets criteria for "working waterfront property" and "gross receipts test." The Act includes provisions for regulations and amendments to the Internal Revenue Code, with an effective date after December 31, 2025.