Yes, rainwater collection is legal in Pennsylvania, but subject to municipal and state regulations, particularly under the Clean Streams Law and local stormwater management ordinances. Homeowners may collect rainwater for non-potable uses, though commercial systems face stricter scrutiny.
Key Regulations for Rainwater Collection in Pennsylvania
- Clean Streams Law (35 P.S. §§ 691.1–691.1001): Prohibits discharging collected rainwater into state waters without a permit, emphasizing pollution prevention.
- Local Stormwater Management Ordinances: Municipalities like Philadelphia and Pittsburgh enforce separate systems, requiring permits for large-scale collection (e.g., >2,500 gallons) under their 2024 Stormwater Regulations.
- Building Codes & Plumbing Standards: Rainwater harvesting systems must comply with IPC (International Plumbing Code) amendments adopted by PA’s Uniform Construction Code, mandating backflow prevention and non-potable labeling.
Commercial entities must secure DEP approval under Chapter 93 (Water Quality Standards), while residential use remains largely unregulated unless exceeding 10,000 gallons. Recent 2026 DEP guidance tightens commercial system inspections, aligning with federal EPA stormwater rules. Always verify county-specific rules, as Allegheny and Bucks Counties impose additional restrictions.