The EPA's public water system record for East St Louis (IL American-East St Louis, system ID IL1635040) reports that its water supply comes from surface water sources serving over 130,000 people. While this record includes some health-based compliance data and detailed treatment methods used, it contains no monitoring data for tannins in the system water.
Distinguishing Tannins from Other Common Water Issues
Tannins are natural organic compounds often found in surface waters where decaying vegetation is present. They cause a tea-like color and can affect taste and staining in households. Unlike iron or manganese, which produce rust-like deposits, tannins primarily discolor water without forming precipitates. This difference matters because conventional water filters for iron or sediment do not address tannins effectively.
How to Read Median and Range in EPA Water Records for East St Louis
Water quality data often includes median and range values indicating typical and extreme measurement results. For East St Louis, available records focus on other parameters but not tannins. In general, medians represent the middle value of multiple samples, while the range shows the variation found among those samples. However, without tannin-specific data, these statistics cannot describe tannin levels or fluctuations here.
Meaning of 'Detected,' 'Median,' and 'Range' for Tannin Data
Though tannins are not monitored in this system’s official data, understanding these terms helps when privately testing your water. 'Detected' means a lab instrument measured the substance, but does not imply a problem or violation. The median tells you the central tendency of multiple tests. The range gives context on variability. No federal numeric limits exist for tannins as they are aesthetic, not health-based, concerns.
Sample Size and Source Variability in Water Testing
The reliability of water quality data grows with more samples and broader coverage of water sources. EPA data on East St Louis covers thousands of connections but does not include tannin tests. Because tannins depend on source water and seasonal changes, testing inside the home is necessary to know the specific condition of your water supply.
Using Certified Laboratory Tests to Identify Tannins in Home Water
To confirm if tannins affect your household water, you should request a certified laboratory analysis specifically for tannin concentration. This test quantifies how much tannin is present, distinguishing it from other organics or color-causing substances in your water. Reading this report clarifies whether tannins are causing discoloration or taste issues and whether treatment is appropriate.
Choosing the Right Test and Understanding Results
The single most important step to resolve questions about tannins in your home water is to obtain a tannin-specific test from a certified lab on a representative water sample taken before any existing equipment treatment. A measurable tannin level in this test would confirm tannins as the cause of your water's tea-like color and suggest the need for targeted filtration.
To manage ongoing tannin issues in East St Louis homes, the Pentek Yellow, Tea-Colored Tannin Water Filter offers technology designed to reduce tannin discoloration directly. This filter ships ready to configure for residential use and provides a solution when existing equipment cannot keep up with tannin presence in surface water sources.
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 IL AMERICAN-EAST ST LOUIS (IL1635040), surface water supply, serving 131368 people: 1 health-based violations of 2 total; lead 90th percentile 0.003 mg/L
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