Before installing a system, check the state water agency’s requirements and the local building or plumbing department’s rules. Ask whether the proposed collection surface, tank size, location, and use require registration, permits, or inspection. For maintenance, use suitable covered containers, limit debris entering the system, and prevent standing water from becoming a mosquito breeding area. Rooftop runoff should not be assumed safe to drink; drinking-water use requires separate attention to water quality, treatment, and applicable standards. [OSU Extension Service](https://extension.oregonstate.edu/catalog/em-9448-rainwater-harvesting-tanks-or-cisterns-oregon-regulations?utm_source=chatgpt.com)
The precise answer is that unlawful water diversion or storage can carry penalties, including criminal consequences in some circumstances. That does not mean a compliant residential rain barrel is equivalent to an unauthorized reservoir. The Oregon case illustrates the consequences of violating particular water laws, not a blanket prohibition on harvesting rain. Understanding the requirements for your specific location and design allows you to distinguish a permitted conservation project from an activity requiring additional authorization. [govinfo.gov](https://www.govinfo.gov/content/pkg/USCOURTS-ord-1_16-cv-00200/pdf/USCOURTS-ord-1_16-cv-00200-0.pdf?utm_source=chatgpt.com)