Is lead present in my household water in Pierce County? Government sampling for the Tacoma Water Division City of public water system shows a 90th percentile of lead at 0 mg/L, indicating that among tested sites, most lead levels were below detection or very low in distribution plumbing. This data reports distribution system conditions, not source water or individual home plumbing.
Lead Levels Depend More on Plumbing Material and Age Than Surface Water Source
The public water system serving over 440,000 people in Pierce County relies on surface water, but lead is typically not introduced at the source. Instead, plumbing components such as older pipes, solder, or fixtures containing lead can contribute lead to water after it leaves the treatment plant. Thus, household lead levels are influenced by the materials and age of internal plumbing separate from source water quality.
Commercial and Industrial Users Face Different Considerations Than Residential Households
While residential concerns focus on safe drinking water and typical household volumes, commercial or industrial operations may have additional factors such as process water requirements or regulatory compliance for lead concentration. Households benefit from localized testing to determine the presence of lead and selecting appropriate treatment based on residential use patterns.
Household Size, Second Homes, and Seasonal Properties Affect Treatment Decisions
Large households may require higher capacity or flow-rate treatment options, while second or seasonal homes might prioritize equipment that is easy to configure and maintain during periods of vacancy. These factors guide the choice among available treatment approaches for lead reduction.
Understanding 'Detected,' 'Median,' and 'Range' in Lead Sampling Records
The Tacoma Water Division’s lead 90th percentile at 0 mg/L means that in the sampling, 90% of the tested sites had lead levels at or below zero, effectively showing undetectable amounts in these samples. 'Detected' indicates lead was measured but does not imply a violation or health risk. The ‘median’ and ‘range’ describe the distribution of lead levels among sites sampled but are not specified in this record.
Public System Records Provide Area-Level Data, Not Individual Household Water Quality
These records reflect water quality after treatment and in the distribution system for hundreds of thousands of residents but do not measure individual home plumbing conditions. To know lead levels for a specific property, direct water testing at the tap is necessary.
Choosing Treatment for Lead depends on confirming lead presence with testing, then selecting a system designed to reduce lead effectively. The Pentair Lead in Water Filter ships ready to configure and is designed for residential use to address lead if testing shows it is present in your household water.
What You Should Not Conclude From Pierce County Data
You should not assume your home’s water contains no lead simply because the 90th percentile lead measure is zero in the public system record. Individual plumbing materials and conditions vary and can introduce lead independently of public water system quality. Testing your own water is the only way to identify your specific treatment needs.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2025-12-31. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA SDWIS record for TACOMA WATER DIVISION CITY OF (WA5386800), surface water supply, serving 446170 people: 9 health-based violations of 12 total; lead 90th percentile 0 mg/L
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