Understanding your certified laboratory test report
Reported constituent concentrations are numerical and based on sample source
A certified laboratory drinking water report typically shows the concentration of various substances found in your water sample, expressed in milligrams per liter (mg/L) or micrograms per liter (µg/L). For example, lead is reported as the 90th percentile concentration of samples taken at home plumbing points, representing the level below which 90% of samples fall.
Reports specify sample locations and dates for context
Lab test reports include when and where samples were collected, which is important because concentrations can vary greatly between a regional public water source and an individual household plumbing.
Data includes comparisons to regulatory limits or guidance levels
Reports commonly reference EPA's health-based standards or secondary standards to help interpret whether detected levels are considered concerning or within expected ranges.
Consequences of not addressing water quality issues over years
Untreated water concerns can lead to cumulative scaling or staining in plumbing
Depending on constituents detected in your water system, untreated water may gradually cause staining on fixtures or reduce efficiency of appliances due to scale buildup, though these effects depend on constituent levels and water chemistry.
Fluctuating water quality can impact taste and appearance intermittently
Changes in water composition over seasons or supply shifts can affect aesthetics like clarity or taste, which untreated water filters can help mitigate.
Distinguishing this water quality issue from often-confused problems
Lead levels in public water system plumbing samples differ from source water content
The lead 90th percentile reported for Bromley Water Company is from plumbing, not the groundwater source, meaning local plumbing materials or corrosion control influence this measurement.
Detected constituents do not necessarily indicate safety violations
Detection means a constituent was measured but does not imply a violation or unsafe water by itself; health-based violations are recorded separately when applicable.
Information to record before consulting for treatment advice
Note the public water system name and identification number
For Peru, Bennington County, refer to Bromley Water Company with ID VT0005024 when discussing water quality.
Record recent lab report dates and constituent percentile values reported
E.g., the lead 90th percentile was reported as 0 mg/L on 2023-12-31, indicating low lead levels in plumbing samples at the system scale.
Include the number of people served and connections in your area
Bromley Water Company serves approximately 4,300 people across 400 connections, which reflects system size and sampling scope.
Clarifying sampling terms: detected, median, and range
Detected means the constituent was measured during sampling
A 'detected' result simply indicates the presence of a substance at or above the instrument's detection limits during testing.
Median is the middle value of all sample results
The median offers a typical concentration value, where half of samples fall above and half below.
Range indicates the lowest to highest concentrations measured
The range shows the spread of sample results, which reflects variability in water quality across locations or times.
Why secondary standards differ from health-based limits for this constituent
Secondary standards address water aesthetics, not health effects
These standards relate to taste, color, or staining potential and are not enforceable health limits; exceeding them does not mean water is unsafe.
Health-based limits focus solely on health risks
Health-based limits are set based on known health impacts from exposure and carry regulatory authority to ensure safety.
Understanding this distinction helps prioritize testing and treatment choices
Knowing if a constituent is governed by a secondary aesthetic standard versus a health limit guides whether treatment aims at improving taste/appearance or protecting health.
In summary, Bromley Water Company’s public water system record for Peru, VT, provides a snapshot of regional groundwater-sourced drinking water quality serving about 4,300 people. You can use these measures as a starting point in sizing a whole-home drinking water treatment solution, such as the C-Series Whole-Home + Drinking Combo System with a grain capacity of 32,000, which ships ready to configure. For specific treatment decisions, individual home water testing is necessary to understand your water’s unique characteristics. The official source of this information is the EPA SDWIS public water system record for VT0005024.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2023-12-31. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA SDWIS record for BROMLEY WATER COMPANY (VT0005024), groundwater supply, serving 4300 people: 3 health-based violations of 11 total; lead 90th percentile 0 mg/L