When trying to determine if your household water is safe to drink in Jefferson County, it is important to understand what government data about the local public water system can and cannot reveal. These records reflect conditions measured for the entire Green Mountain Water System, but do not specify individual homes or plumbing. Let’s explore how to read this information and assess your own water quality accurately.
If you see terms like 'detected', 'median', and 'range' in system water quality reports
In the public water system record for Green Mountain WSD serving Jefferson County, 'detected' means that certain substances were measured in some sampling events. The 'median' is the middle value of all measurements taken over a set period, while the 'range' shows the lowest and highest concentrations recorded. None of these alone establish a violation or guarantee a problem; they simply document what instruments measured in that system's water over time.
If you want to know how your tap water might change after using a specialized filtration system
The C-Series Safe Drinking Water Filter ships ready to configure and is designed to reduce contaminants of concern documented in surface water supplies like Green Mountain’s. Once in place at your tap, this filter can improve taste and reduce certain substances, helping your household enjoy safer drinking water. It addresses factors that may be present in the source water before treatment or could enter during distribution to your tap.
If you want to understand the difference between public system data and private well testing
Records on the Green Mountain system describe water quality as sampled across the entire distribution network serving nearly 49,400 people and over 11,000 connections in Jefferson County. This data cannot reflect your home’s unique plumbing or well conditions. Testing your own well or household supply is necessary to obtain specific results about your water’s chemical or biological makeup.
If you want a practical example of interpreting the system record’s median and range for your household water
For example, the system's surface water source data collected over multiple years shows variation in certain substances. The median value indicates a typical concentration, while the range captures fluctuations. Your household water may fall anywhere within or outside this range, especially considering differences in plumbing materials or local water usage patterns.
If you want to understand what these measurements mean relative to federal safety and aesthetic benchmarks
Of the two total EPA health-based violations recorded for Green Mountain WSD, one remains active, indicating an area for attention in the system's treatment or management. However, detections or values within aesthetic secondary standards are not health violations. They may affect taste, staining, or corrosivity but do not necessarily mean the water is unsafe to drink.
If you are curious about how water quality in this system varies seasonally or over multiple years
The Green Mountain public water record compiles data collected over time, reflecting the natural and operational changes in surface water supply and treatment. Seasonal shifts, weather patterns, and maintenance activities may influence measured ranges. This historical data can help understand typical conditions but cannot guarantee water quality on any single day.
In summary, this page has guided you from understanding public water system sampling terms to seeing how filtration can affect your tap water, distinguishing system-wide records from private well testing, and interpreting data ranges alongside federal standards. These steps empower you to make informed decisions about safe drinking water for your Jefferson County household.
Where this information comes from
Source: EPA SDWIS public water system record. Record retrieved 2026-09-10. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA SDWIS record for GREEN MOUNTAIN WSD (CO0130321), surface water supply, serving 49400 people: 1 health-based violations of 2 total