The EPA records for Lewiston City of public water system (ID2350014) in Nez Perce County, ID, serving about 15,000 people with surface water, show no health-based violations on record. This means the water meets EPA standards for health, but the records do not include monitoring data for tannins specifically. Tannins are naturally occurring organic compounds that can cause tea-like discoloration in water drawn from surface sources.
What Changes for a Large Household, a Second Home, or a Seasonal Property
For larger households or seasonal properties in Nez Perce County using water with tannins, the volume of water treatment required may rise, as more water passes through your household plumbing and fixtures. Tannins can stain fixtures and laundry over time, and their presence may be more noticeable when water sits unused for extended periods, such as in a seasonal home. Concentrations of tannins often vary by season due to changes in surface water makeup, so regular observation is important.
What You Should Write Down Before Asking for Treatment Advice
- Note visual changes in water color, especially tea or amber tones.
- Record any staining on fixtures, sinks, or appliances over time.
- Observe variations by season or after periods of water inactivity.
- Check if odor or taste changes accompany discoloration.
- Identify your water source type (in this case, surface water as per EPA record).
Having detailed notes helps tailor advice and select appropriate treatment solutions.
How Sample Depth, Well Depth, or Source Type Changes What You Should Expect
Since this public water system draws from surface water, tannins are more likely than in groundwater sources because surface waters collect decayed vegetation and organic material. Tannins tend to accumulate more in shallower sources exposed to leaf litter or wetlands. Deeper wells often show less discoloration from tannins, but this depends on local hydrogeology. Knowing water source depth and type helps predict tannin presence.
What a Certified Laboratory Test for Tannins Reports and How to Read It
Testing water for tannins involves collecting a water sample and sending it to a certified laboratory experienced in analyzing natural organic compounds. The lab provides a report specifying tannin concentrations in milligrams per liter (mg/L). Because tannins are not regulated by federal or state health-based limits, results focus on aesthetic impact rather than safety thresholds. Compare your values to reference ranges or consult a water treatment specialist for interpretation.
What the Measured Range Means Against Relevant Federal Standard, and What It Does Not Mean
Currently, no federal health-based standard exists for tannins in drinking water. Their concentration affects water color and staining potential but does not represent a health risk on their own. Detection or elevated tannin levels do not imply water is unsafe or that health violations exist. The EPA’s zero health-based violations status for Lewiston City of water confirms compliance on health parameters, though tannin-specific monitoring is not part of the record.
Because tannins primarily impact aesthetics, households often seek solutions to reduce water discoloration and staining. The Pentair Yellow, Tea-Colored Tannin Water Filter is designed to address tannin-related water issues by removing the compounds responsible for coloration, improving water clarity and reducing staining.
What You Should NOT Conclude From Area Data
Government data for the Lewiston City water system in Nez Perce County does not detect tannins or measure their levels; it only records the source and treatment compliance without health-based violations. This absence of tannin data does not prove tannins are absent from your home water. Only specific testing of your individual water can identify tannins and their concentration. Additionally, detected tannins would not indicate a health concern but an aesthetic condition that some households choose to treat.
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 LEWISTON CITY OF (ID2350014), surface water supply, serving 15001 people: 0 health-based violations of 42 total; lead 90th percentile 0.001 mg/L
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