Philadelphia's Water System Context
The Philadelphia Water Department supplies surface water to about 1.6 million people and over 500,000 connections. Government records show no health-based lead violations in this public water system. Lead measurements reported on the distribution end, such as the 90th percentile value, reflect water after it has passed through plumbing and household systems rather than source water content.
Influence of Plumbing Materials and Building Age
Older plumbing can contain lead pipes or solders
Lead may enter water as it travels through household plumbing, especially in buildings constructed before lead restrictions. This factor is separate from the treatment or source water quality and affects what residents might find at their taps.
Newer plumbing reduces lead risk but does not guarantee zero lead
While updated plumbing materials limit lead release, trace amounts can occasionally arise from distribution system components or household fixtures, underscoring the importance of individual water testing.
Effect of Sample Location and Water Source
Lead sampling at tap points measures water after plumbing contact
Lead concentration data usually come from first-draw or flushed samples collected at household taps, reflecting plumbing influence rather than source water alone.
Philadelphia's source water—surface water—is treated and monitored
Since lead is rarely found at the source, detected lead typically originates within the distribution system or home plumbing.
Pathways of Lead Entry in Philadelphia's Water System
Lead primarily leaches from plumbing materials within homes
Lead does not commonly enter from Philadelphia's surface water but may dissolve from pipe solder, fixtures, or connectors inside residences.
Distribution system corrosion control minimizes lead release
The water department applies corrosion inhibitors to reduce lead solubility, keeping lead levels low within the distribution network.
Reading the Lead Sampling Record for Homeowners
The 90th percentile lead concentration in 2025 was 0.002 mg/L
This value means 90% of lead samples were at or below 0.002 mg/L in distribution system testing, indicating low lead presence overall but not ruling out higher levels in specific homes.
Individual water testing is essential to know your home's condition
Data represent system-wide measurements and cannot predict lead levels at any single faucet, making personal testing the only way to confirm household water quality.
How the C-Series Lead in Water Filter Responds to Lead
Designed to reduce lead at the point of use
The C-Series Lead in Water Filter ships ready to configure and captures lead particles or dissolved lead compounds present in household water, providing an additional protective barrier.
Complements water department corrosion control efforts
This filter works independently of source water treatment, directly treating the water entering taps to reduce potential lead exposure from plumbing sources.
Summary
Philadelphia's water system data show low lead levels overall and no health-based violations, but household plumbing remains a key lead source. Confirm your home's water quality through testing and consider point-of-use filtration like the C-Series Lead in Water Filter to manage potential lead exposure effectively.
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 PHILADELPHIA WATER DEPARTMENT (PA1510001), surface water supply, serving 1600000 people: 0 health-based violations of 9 total; lead 90th percentile 0.002 mg/L