Government Water System Data for Multnomah County
System Source: Surface Water Supply
The Portland Water Bureau serves Multnomah County with a surface water source, which is a common origin point where tannins can enter water supplies due to natural organic materials in the water.
Health-Related Violations Recorded
This water system has one EPA health-based violation as of the last reporting period, unrelated to tannins.
Lead 90th Percentile Measure
Lead levels in the distribution system are low, reflecting typical plumbing-related measurement rather than source water quality.
How Treated Water Changes at the Tap After Using the Fleck Yellow, Tea-Colored Tannin Water Filter
Reduction of Tea-Colored Water
Water treated with this filter shows a significant decrease in tea-colored staining often associated with tannins, improving clarity and appearance.
Less Discoloration on Fixtures and Laundry
Fixtures and fabrics exposed to treated water experience fewer tannin stains, helping preserve their appearance and lifespan.
Improved Taste and Odor Profile
Removal of tannin-related organic compounds can reduce earthy or musty tastes and odors sometimes associated with this natural constituent.
Comparing Multnomah County Water Records with Neighboring Counties
Consider Source Water Type
Nearby counties using groundwater sources generally report fewer tannin concerns since tannins primarily originate from surface water.
Avoid Applying System Data to Individual Sites
Regional data provides context but cannot establish the presence or concentration of tannins in any one home’s water supply.
Regional Differences in Seasonal Effects
Surface water systems show variable tannin levels with seasonal changes, so comparison should consider timing of sampling.
Household Symptoms That May Indicate Tannins or Other Issues
Observed Tea-Colored Stains on Plumbing Fixtures
Staining in sinks, tubs, or toilets may suggest tannins but can also indicate other minerals or organic matter.
Water Color Changes After Equipment Failure
Sudden appearance of yellow or amber discoloration may relate to tannins or degradation of existing treatment devices.
Absence of Typical Iron or Manganese Indicators
Unlike iron, tannins do not cause reddish or black deposits, which helps differentiate the underlying cause.
Fixtures, Appliances, and Processes Most Affected First
Showers and Faucets With Frequent Use
Visible staining tends to appear first on fixtures used often, as the water contact promotes buildup.
Clothes Washing Machines
Laundry may show discoloration or dull fabric when tannins are present in untreated water.
Toilets and Porcelain Surfaces
Tea-colored water can leave noticeable stains on toilet bowls and ceramic surfaces.
Influence of Plumbing Material and Age
Older Plumbing Can Retain Stains Longer
Porous or aged plumbing materials may exhibit persistent staining even after source water treatment.
Material Compatibility with Organic Compounds
Some pipe materials interact differently with tannins, affecting staining and water clarity.
Maintenance Rhythm for the Fleck Yellow, Tea-Colored Tannin Water Filter
Periodic Filter Media Regeneration
The filter requires routine regeneration cycles to restore tannin removal efficiency, scheduled according to household water use.
Regular Resin Bed Rinsing
Rinsing removes accumulated organic matter to maintain clear water output.
Monitoring for Decreased Performance
Signs to watch include return of discoloration or staining, indicating it is time for maintenance actions.
Next Steps: Confirming Tannins in Your Household Water
The definitive way to determine tannin presence and concentration in your home water is to order a professional water test specific for tannins. A quantitative result will establish the scope of treatment needed and confirm whether the Fleck Yellow, Tea-Colored Tannin Water Filter is appropriate for restoring water clarity and quality.
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 PORTLAND WATER BUREAU (OR4100657), surface water supply, serving 666200 people: 1 health-based violations of 2 total; lead 90th percentile 0.00489 mg/L
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