What a Laboratory Test Report for Tannins Typically Includes
Standard Reporting of Tannin Concentrations
Laboratory analyses for tannins present results as tannin or color concentration, usually in milligrams per liter or as color units. They distinguish tannins from other natural organic matter by their chemical properties. Such a report indicates if tannins are present in your water, which a local system record alone cannot confirm.
Purpose of Testing for Tannins
Testing quantifies tannin levels to identify tea-like color or staining problems that can affect water appearance, taste, or plumbing fixtures. This is the first step to selecting an effective solution tailored to your home's water quality.
How Tannins Enter Water in Hartford County's Surface Water System
Source Water Characteristics
The Northern Regional-Western System serving Hartford County draws water from surface water sources, such as lakes and rivers. Tannins often originate from decaying leaves, wood, and organic material commonly found in these environments.
Pathway to Household Water
Natural organic compounds like tannins can pass into the treatment system and distribution despite treatment steps. The EPA records for this system report no health-based violations, but do not include tannin monitoring data, so their presence is not confirmed or ruled out.
Interpreting Measured Ranges and Federal Standards
What the Federal Record Shows and Omits
EPA's public water system record for CTWC Northern Reg-Western System validates no health-based violations and lists various treatment codes but does not test or report tannin levels. Therefore, it neither confirms tannin presence nor quantifies it.
What This Means for Homeowners
Without direct tannin data, residents cannot assume tannins are present from public system data alone. Only a private water test focused on tannins can reveal their specific concentration in your home.
Differences Between Aesthetic Secondary Standards and Health-Based Limits
Why Aesthetic Concerns Are Separate
Tannins affect water color and staining but are not a health hazard, so no EPA health-based limits exist. Instead, secondary standards guide appearance and taste preferences, helping maintain water clarity and avoid discoloration.
Implications for Your Water
If tannins cause tea-colored water, this is an aesthetic issue. It does not indicate unsafe water but may warrant treatment to improve comfort and prevent stains.
Consequences of Ignoring Tannin Presence Over Time
Potential Water Color and Staining
Untreated tannins can cause persistent yellow or brown coloration in water, staining sinks, plumbing fixtures, and laundry over the years, impacting household activities.
Effects on Water Taste and Odor
Though not harmful, tannins can impart a slight tea-like taste or odor that some may find unpleasant.
Example: How to Read Median and Range Data in the Context of This System
EPA Record Coverage
The system’s record for public water sources shows no tannin monitoring, so median or range data for tannins are unavailable from this source.
Your Next Steps as a Homeowner
Order a certified laboratory test for tannin concentration in your water to obtain median and range values specific to your household.
What Not to Assume from Hartford County Water System Data
No Confirmation of Tannin Presence
Because no tannin monitoring exists for the Northern Regional-Western System, presence or absence in your home’s water is unknown from public data.
No Health Risk Indicated
EPA records show zero health-based violations, confirming municipal water in Hartford County meets health safety standards regardless of tannin considerations.
Treatment Option for Tea-Colored Water
If tannins are found and cause tea-like coloration, the Fleck Yellow, Tea-Colored Tannin Water Filter ships ready to configure and effectively reduces tannin color and staining, enhancing water appearance and comfort.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2026-12-31. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA SDWIS record for CTWC - NORTHERN REG-WESTERN SYSTEM (CT0473011), surface water supply, serving 101313 people: 0 health-based violations of 55 total; lead 90th percentile 0.0019 mg/L