Seasonal and Multi-Year Variation in Local Water Quality Records
EPA Records Show Ongoing Compliance
The Tualatin Valley Water District, serving 224,600 residents through 62,160 connections with surface water sources, reports zero health-based EPA violations through 2025, indicating stable water quality across years.
Record Timeframes Reflect Source Stability
Records are current through December 2025 but do not include microplastics data. Seasonal shifts in surface water can influence microplastic prevalence generally, though no direct measurements exist here.
Understanding Certified Laboratory Microplastics Testing
Lab Tests Identify Specific Microplastic Types and Sizes
Certified testing uses filtration and spectroscopic methods to quantify microplastic particles by size and polymer type, providing concentration levels relevant only to the sampled water.
Results Are Reported as Particle Counts or Concentrations
Laboratory reports detail particle counts per liter or mass concentrations. These readings are essential as governmental system records like Tualatin Valley's do not currently track microplastics.
Influence of Source Type and Sample Depth on Expectations
Surface Water Sources Are More Exposed to Microplastics
Surface waters commonly show higher microplastic presence due to runoff and atmospheric deposition compared to groundwater. Tualatin Valley's exclusive use of surface water places it in this category.
Sample Depth Affects Detection Levels
Deeper intake points in reservoirs or rivers may have differing microplastic levels than surface samples. Household water reflects what passes through treatment and plumbing, which might add or reduce particles.
Routine Care for the Autotrol Microplastics Filter
Regular Filter Media Replacement Is Key
The Autotrol Microplastics Filter ships ready to configure for residential use and requires periodic replacement of filtering media to maintain efficiency in removing microplastic particles.
System Backwash and Cleaning Schedule
To sustain performance, periodic backwash cycles refresh the filter. Homeowners should follow the manufacturer’s guidelines for timing to prevent clogs and performance loss.
Interpreting Median and Range in Practical Terms
No Microplastic Data Available in Public Records
The Tualatin Valley Water District’s record includes no microplastics measurements, so median or range figures are not reported for this constituent.
Lead Levels Illustrate Distribution Testing—Not Source Water
Lead was measured at the 90th percentile at 0.0045 mg/L, reflecting plumbing system influence rather than source water, exemplifying why individual microplastic testing is necessary.
Next Step for Homeowners Concerned About Microplastics
The single most effective test to determine your household water's microplastic concentration is a certified laboratory analysis sampling your tap water directly. Results showing particle size, type, and concentration will clarify your water’s status and whether deploying an Autotrol Microplastics Filter is appropriate.
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
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