{"data":{"id":"us-de/16-del.-c.-7934","jurisdiction":"us-de","citation":"16 Del. C. § 7934","heading":"Backflow.","body":"(a) For purposes of this section:\n(1) “Backflow” means the movement of water back in the direction from which it was flowing.\n(2) “Backflow preventer” means a device that prevents backflow.\n(3) “Backsiphonage” means backflow caused by negative pressure, which occurs when there is a drop in water pressure resulting in the water flowing back into the water service line.\n(4) “Low hazard building” means a building in which any backflow that does occur meets the following conditions:\na. Occurs only by backsiphonage.\nb. Does not create a health risk or health hazard.\nc. Does not disrupt the service of piped water for human consumption or impair the potability of that water.\nd. Does not pose a risk to any fresh water supply.\ne. The pumping system involved does not connect to a treatment system used to convey wastewater, fertilizers, or chemicals, or that is used to provide fire protection.\nf. The water system involved does not draw from more than 1 aquifer without a backflow preventer on the discharge line of each well.\n(b) Subject to subsection (c) of this section, a county or municipality may not require backflow preventers to be installed or, if already installed, to be subject to inspections, in low hazard buildings of any of the following types:\n(1) Single-family residences.\n(2) Single-family residences with conditional uses that permit professional offices.\n(3) Professional offices.\n(4) Commercial buildings.\n(c) If a low hazard building has fresh water supplied by a public well, backflow preventers must be installed in compliance with 7 DE. Admin. Code, Regulation 7301, governing the construction and use of wells.","path":["Title 16. Health and Safety","Building and Plumbing","CHAPTER 79. Basic Plumbing Principles"],"source_url":"https://delcode.delaware.gov/title16/c079/index.html#7934","current_through":"2026-08-10 (85 Del. Laws, c. 421, 424)","vintage":"","retrieved_at":"2026-09-05T23:02:22Z","sha256":"ee30624b649ab9f1d4c2a85f170e030f0edf185e1a06f17c48ec8b84d5e76295","source_id":"us-de","stale":true,"prev":"us-de/16-del.-c.-7933","next":"us-de/16-del.-c.-7935"},"notice":"GroundRules: Original legal text. Not legal advice."}