This week, your key decision involves understanding what aspects of your home's water supply might affect its safety and what you can do next.
Belief: The source water alone determines whether household water is safe to drink
Many assume water safety is decided only by what comes from the source. In Montgomery County, the Aqua PA Main System, which relies on surface water, provides water to over 800,000 people. Government records show two health-based violations of 49 total in this system’s history; these are aspects the EPA has identified as health-related. However, the safety and quality of water reaching your tap also depend on the pipes and plumbing materials within your home, which can introduce variables unrelated to the source water.
Belief: The median values reported in public system records directly indicate my home’s water quality
Looking at the Aqua PA Main System’s lead 90th percentile, sampled in late 2025, the reported figure is 0 mg/L, reflecting the distribution across many homes and plumbing systems. This measurement describes lead levels found in tap water across sampled sites, not the source water itself. Median and percentile values summarize many samples and do not substitute for individual household testing. Establishing your own water’s content accurately requires certified laboratory testing of your tap water.
Belief: The number of samples is insignificant when assessing water quality for my household
The figures from this system come from extensive sampling involving hundreds of thousands of connections. Yet, when focusing on your home, the data origin is crucial: large-scale sampling provides an overview of system-wide conditions but cannot determine precise concentrations present in your plumbing. A small sample size for a specific contaminant or location means less certainty about that component in your personal water supply.
Belief: Aesthetic secondary standards are health limits that dictate whether water is safe
Aqua PA’s record includes monitoring of various constituents governed by secondary standards, such as taste, staining, or corrosivity indicators. These are not health-based limits but aesthetic guidelines to manage water appearance and palatability. For example, chloride and total dissolved solids have recommended maximum levels aimed at reducing unpleasant tastes or pipe corrosion but do not indicate a water safety violation or health hazard by themselves.
Belief: Maintaining water treatment equipment is complex and frequent
The Autotrol Safe Drinking Water Filter offers a practical solution for households seeking improved water quality. It ships ready to configure and requires maintenance on a predictable schedule tailored to your household’s water consumption. This routine ensures consistent performance without complicated upkeep.
By examining Montgomery County’s public water system data and understanding the interaction of plumbing materials and sampling scope, you gain a clearer picture of your water’s safety. Testing your own water, alongside considering the Autotrol Safe Drinking Water Filter, can support your objective to secure safe drinking water at home.
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 AQUA PA MAIN SYSTEM (PA1460073), surface water supply, serving 822600 people: 2 health-based violations of 49 total; lead 90th percentile 0 mg/L
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