Pennsylvania law permits rainwater harvesting statewide with no state-level prohibition, while plumbing code universally governs any potable connection to home systems.
Pennsylvania has no statute restricting rainwater collection. The Uniform Construction Code (Act 45 of 1999) at 34 Pa. Code Chapters 401-405 universally adopts the International Plumbing Code provisions governing non-potable rainwater systems and cross-connection control. Any indoor plumbing tie-in must comply with state UCC requirements regardless of locality. Outdoor barrel collection is unrestricted.
Plumbing connections without code-compliant backflow prevention can result in UCC violations, abatement orders, and civil penalties up to $1,000 per day until corrected.
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See how Williamsport's rainwater harvesting rules stack up against other locations.
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