This week, many Lehigh County households face the important task of choosing the right size for a city water treatment system from local water quality records.
Reading Lehigh County's Water System Data: Median and Range Explained
The LCA ALLENTOWN DIVISION public water system serves over 118,000 people in Lehigh County, including 33,498 residential connections. The system relies on surface water sources and has maintained zero EPA health-based violations. For example, lead levels tested in distribution piping show a 90th percentile of 0.007 mg/L as of September 2025. This statistic does not reflect source water but the water reaching consumers after treatment and in-home plumbing. Understanding these values helps homeowners anticipate what treatment capacity may be beneficial but does not define their home's exact water quality.
Potential Consequences of Untreated City Water Issues Over Time
Without appropriate treatment, certain characteristics of city water such as mineral content or disinfectant byproducts may gradually affect plumbing and appliances. While the LCA ALLENTOWN DIVISION’s data shows compliance with health standards, water may still contribute to fixture staining or scaling, potentially affecting longevity and efficiency. Addressing these concerns proactively can preserve appliance function and household comfort. However, none of these reflect health risks given the absence of violations in system records.
Comparing Lehigh County Water Data to Neighboring Counties: Avoiding Overinterpretation
Water quality can vary considerably between counties. While Lehigh County’s system shows no health-based violations and low lead readings, neighboring areas may have different water sources or treatment practices. Comparing these datasets should focus on broad trends rather than expecting identical results or assuming one county's data applies directly to another’s households. Differences in source water and system management influence treatment needs.
Understanding EPA Sampling Terms: 'Detected,' 'Median,' and 'Range' in Context
The EPA’s water system record uses terms that describe measurement results across multiple samples. 'Detected' means the substance was measured but does not imply any violation or safety concern. The 'median' is the middle value in the data set, representing typical conditions, while the 'range' shows the lowest and highest measurements recorded. These values help characterize the system’s water quality but do not substitute for individual home testing to determine precise needs.
Distinguishing City Water Treatment Needs from Commonly Confused Water Issues
City water treatment needs based on Lehigh County’s system differ from issues related to well water or hard water treatment found elsewhere. Municipal water is monitored to meet health standards, so concerns typically focus on secondary effects such as taste or appearance rather than safety violations. This contrasts with private well water where contaminants and variability may require different approaches. Treatment systems sized for city water should address those specific household impacts documented by local system data.
Conclusion: Lehigh County’s public water system record indicates safe drinking water with no health-based violations, but sizing a household city water treatment system requires understanding what the system data does—and does not—reveal. Homeowners should consider individual water testing to determine specific treatment needs. The C-Series City Whole-Home Protection System, with its 32,000-grain capacity, ships ready to configure for homes seeking comprehensive management of typical city water concerns.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2025-09-30. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA SDWIS record for LCA ALLENTOWN DIVISION (PA3390024), surface water supply, serving 118000 people: 0 health-based violations of 5 total; lead 90th percentile 0.007 mg/L