{"data":{"id":"us-va/12vac5-630-430","jurisdiction":"us-va","citation":"12VAC5-630-430","heading":"Disinfection","body":"A. Private wells shall be disinfected before placing the well in service.\n\nB. Methodology. Disinfection shall be accomplished by one of the following methods:\n\n1. Maintaining a 100 mg/l solution of chlorine in the well for 24 hours utilizing the dosage rates set forth in 12VAC5-630-470.\n\n2. Applying a quantity of water/chlorine solution to ensure a minimum of 100 mg/L of available chlorine throughout the well and immediate formation materials. Disinfection contact time shall be established on the basis of contact units, which are calculated as mg/L chlorine multiplied by hours of exposure. Contact time shall equate to a minimum of 1,000 contact units (50 mg/L chlorine x 20 hours = 1,000 contact units; 200 mg/L chlorine x 5 hours = 1,000 contact units; etc.).","path":["Title 12. Health","Agency 5. Department of Health","Chapter 630. Private Well Regulations","Part III. Design and Construction Criteria","Article 2. General Provisions"],"source_url":"https://law.lis.virginia.gov/admincode/title12/agency5/chapter630/section430/","current_through":"2026 Regular Session (effective July 1, 2026)","vintage":"","retrieved_at":"2026-09-14T04:50:48Z","sha256":"75774c60b193f288a044213649c4445a0703c8570757a73a67789178b98308c6","source_id":"us-va-vac","stale":false,"prev":"us-va/12vac5-630-420","next":"us-va/12vac5-630-431"},"notice":"GroundRules: Original legal text. Not legal advice."}