Making an Informed Choice This Week About Lead in Your Water
As a homeowner in Washington County, you face a decision about lead in your water that requires careful interpretation of regional data before considering any treatment options.
Understanding the Regional Lead Measures for Your Household
The Tualatin Valley Water District, serving over 224,000 residents in Washington County, reported a lead 90th percentile level of 0.0045 mg/L in distribution system samples taken at the end of 2025. This statistic means that 90% of sampled taps in the system had lead levels at or below 0.0045 mg/L, reflecting the interaction of water with plumbing materials in the distribution network and not the raw source water itself.
Seasonal and Multi-Year Lead Variation in Public Water Records
Lead measurements in public water systems like Tualatin Valley Water District show some fluctuation over time because of changes in water chemistry, treatment processes, and plumbing conditions. Although this page reports a 2025 sample, historical monitoring often spans several years, indicating that lead levels can vary naturally without indicating a systemic health violation. No violations have been recorded for lead by EPA’s health-based criteria here.
Differences Between Public Water System Records and Private Well Testing
Public water system lead data reflect aggregated statistics from many taps and indicate system-wide conditions influenced by source water, treatment, and distribution plumbing. By contrast, testing your own well or household tap water reveals your unique lead concentration, which depends heavily on your home’s internal plumbing materials and water usage patterns. Regional public system data provide a useful baseline but cannot substitute for personal water testing to understand your specific conditions.
Potential Consequences of Leaving Lead Untreated Over Time
Lead exposure accumulates gradually over years and can impact health through long-term ingestion. While no immediate severe hazards are indicated by the system record, untreated lead in home water can contribute to chronic lead exposure especially in sensitive individuals. Measures that reduce lead passage at the tap help manage this risk by lowering intake over time.
What to Note Before Seeking Lead Water Treatment Advice
Before requesting any water treatment information, record your water provider’s identity and verify your water source. Consider getting a certified laboratory test of your household tap water for lead to know your actual exposure level. Note any recent plumbing changes or corrosion issues that may affect lead release. These details help in choosing the right solution tailored to your situation.
Clarifying Terms: 'Detected', 'Median', and 'Range' in Your Regional Lead Report
In the Tualatin Valley Water District’s lead report, 'detected' means instruments found some measurable lead; it does not imply a violation or unsafe condition. The 90th percentile level reported (0.0045 mg/L) is a statistical measure indicating that 90% of samples fall below this concentration. Together, these values describe a range of lead levels in the system without indicating any legal exceedance or health violation in Washington County.
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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 TUALATIN VALLEY WATER DISTRICT (OR4100665), surface water supply, serving 224600 people: 0 health-based violations of 0 total; lead 90th percentile 0.0045 mg/L