Chapel Hill, NC Landscaping Rules: Rainwater Harvesting (2026)

North Carolina is a rainwater-friendly state, and Chapel Hill — partnered with OWASA on conservation messaging — actively encourages rain barrels and cisterns. NCGS 160A-202 provides: 'No city ordinance may prohibit, or have the effect of prohibiting, the installation and maintenance of cisterns and rain barrel collection systems used to collect water for irrigation purposes,' although a city may regulate them to protect public health and safety and prevent them from becoming a public nuisance. A simple downspout-fed rain barrel for outdoor irrigation requires no Chapel Hill Town permit. Under NC Session Law 2009-243, harvested rainwater may also be used indoors for toilet flushing and outdoors for irrigation when plumbed through a cistern system compliant with the NC State Plumbing Code, NC Appendix C (Rainwater Recycling Systems), and the NCDEQ Stormwater Design Manual Section C-7 (Rainwater Harvesting). Plumbed cistern systems and rainwater systems connected to building plumbing require a plumbing permit from Chapel Hill Inspections under NCGS 160D-1110. Because OWASA serves Chapel Hill, any cross-connection between a cistern and OWASA's potable water system requires OWASA-approved backflow prevention; OWASA's Cross-Connection Control Program enforces ANSI/AWWA/ASSE backflow standards. Encouragement of harvested-rainwater use is consistent with OWASA's year-round 6 p.m.–10 a.m. spray-irrigation rule and its five-tier increasing block rate that makes large potable-water irrigation expensive.