Every glass of water that comes out of a tap in a Colorado public water system — whether it just left your treatment plant or has been sitting in a distribution main for two days — answers to the same federal rulebook: the National Primary Drinking Water Regulations (NPDWRs). This isn't exam trivia you memorize and forget. It's the reason you test what you test, treat what you treat, and report what you report, every single day on the job. If you understand this framework, almost everything else in your certification — dosing, sampling schedules, paperwork deadlines — stops feeling like a random list of rules and starts feeling like one coherent system with a clear purpose: keeping the public safe.
Where These Rules Come From
The NPDWRs exist because of a single piece of federal legislation: the Safe Drinking Water Act (SDWA), originally passed in 1974 and substantially stre