When considering perchlorate in your household water, it is important to understand the role and limits of available regional data. Federal sampling in Delaware County by the DEL-CO WATER COMPANY, INC. public water system reveals no perchlorate detections above the reporting threshold, but this information does not reflect the specific condition of your home's water. The public system supplies surface water to about 150,000 people across 56,000 connections, and the EPA records show zero health-based violations related to perchlorate, providing context but not a precise personal water reading.
If you want to compare Delaware County’s perchlorate data with neighboring regions without overreading it
Comparing perchlorate data across counties involves recognizing differences in water sources, sampling methodology, and reporting thresholds. Neighboring counties may have wells or surface sources with different environmental factors affecting perchlorate presence, but Delaware County’s public water system testing from 2001 to 2005 found no perchlorate detected above 4.0 micrograms per liter, the reporting level in that survey. This absence of detection in Delaware County’s surface water system does not guarantee the same for neighboring areas or private wells, so comparisons should be made cautiously and with awareness of these data limitations.
If you want a worked example of reading median and range values from the perchlorate record as a homeowner
The official perchlorate monitoring for this system consisted of 16 sampling events with 0 values detected above the 4.0 µg/L reporting level. While no perchlorate was measured beyond this threshold, the complete range of measurement was effectively from zero to just below 4.0 µg/L. A homeowner interpreting this can understand that perchlorate—when present—is below the federal survey’s detection limit, implying no unusual perchlorate burden was found in the public supply during that period. This does not negate the need for private testing if specific concern exists.
If you want to consider how sample depth, well depth, or source type changes your perchlorate expectations
Delaware County’s public system draws from surface water, which can differ significantly in perchlorate presence compared to groundwater sources. Perchlorate tends to enter water bodies through environmental deposition and industrial sources, and its behavior varies with source depth and type. Deeper wells may show different perchlorate levels than surface supplies due to soil filtration and chemical breakdown. If your household uses a private well, a water test directly from your tap or source is necessary to assess perchlorate accurately rather than relying on surface water public system data.
If you want to understand how public system perchlorate records differ from private well testing in what they establish
Public system records represent aggregated data sampled at the system level and reflect general water quality for many users, not individual household systems. These records provide a baseline understanding but cannot confirm the water quality of any one home’s supply. Private well testing analyzes specific water drawn from your well or household connection, delivering precise perchlorate levels relevant to your water use. Therefore, while Delaware County’s public records show no perchlorate above detection limits, private well owners should conduct their own testing to identify any perchlorate presence relevant to their water.
If you want a suggested order for ruling out perchlorate concerns, from easiest check to laboratory test
- Review local public water system data: Delaware County’s DEL-CO WATER COMPANY, INC. reports no perchlorate detected above 4.0 µg/L for surface water sources, indicating no widespread elevated perchlorate in the public supply.
- Identify your household water source: Confirm if your water comes from the public system or a private well, as this determines the next steps.
- Perform a basic in-home test if available: Some quick test kits can detect perchlorate at home but may have limited accuracy or detection limits.
- Obtain certified laboratory testing: For definitive measurement, a laboratory test of your household water source is necessary to identify perchlorate concentrations precisely.
If you want to understand how seasonal or multi-year variation appears in the perchlorate record for Delaware County
The EPA’s Unregulated Contaminant Monitoring Rule (UCMR1) data for this water system spans about one year, from September 2002 to September 2003, within a broader 2001-2005 reporting period. Throughout these samples, perchlorate was never detected above 4.0 µg/L. This suggests stable low levels or absence of perchlorate in the system’s surface water over time, but it does not capture every season or environmental change beyond that period. For households, this reinforces that perchlorate presence has been historically minimal in this public supply, though individual water sources might experience different dynamics.
In summary, Delaware County’s public water perchlorate data show no detection above the federal survey limit in the DEL-CO WATER COMPANY, INC. system during 2001-2005. While this informs general expectations, private household water requires specific testing to determine perchlorate levels. For treatment decisions, the C-Series Perchlorate Filter ships ready to configure as a proven solution when perchlorate is found and household water requires effective removal.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2003-09-23. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR1 monitoring (2001-2005) for DEL-CO WATER COMPANY, INC. (OH2101412), OH: 16 results across 1 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level