Deciding This Week: Should You Investigate Tannins Further?
With tannins being visually noticeable or causing tea-colored water, your immediate question is whether your household water has a significant tannin presence that affects water quality or aesthetics. This checklist helps clarify what the public water system data can and cannot tell you about tannins in your area.
1. What 'Detected', 'Median' and 'Range' Mean in the Sampling Record on This Page
No Tannin Monitoring in This Public Water System
The NJ American Water - Raritan system serving Elizabeth City and Monroe Township in Union County does not have tannin measurements in its publicly available EPA record. This means no federal dataset reports on tannins for this system's surface water source.
What Detection Means Generally
Where tannins have been measured in other systems, 'detected' means the presence was measured by an instrument or method, but not necessarily at a level that causes an issue. The EPA record for this area does not provide any such data.
2. How Many Samples and Wells Stand Behind the Figures, and What a Small Sample Means
Sampling Details for Union County's Water System
The EPA record shows monitoring for other water quality parameters but not for tannins. For parameters that are measured, sample counts often represent many locations and dates, giving a reliable regional overview. Without tannin samples, conclusions about tannin presence cannot be drawn from the system data.
Implications of No Tannin Samples
A lack of samples means individual households cannot rely on system-wide figures to gauge tannin levels. Testing specific to your home water is the only way to know if tannins are an issue for you.
3. How the Constituent Enters Groundwater or the Distribution System in This Region
Tannins and Surface Water Sources
Tannins are natural organic substances leached from decaying vegetation and soil. Systems like NJ American Water - Raritan rely on surface water sources, typically rivers or lakes, where tannins can sometimes be more likely to appear compared to groundwater.
Why Tannins May Affect Household Water
If surface water is a supply source, tannins may enter the distribution system during rainfall or runoff events that carry organic matter into the water body.
4. The Role of Plumbing Material and Age, Separate From the Source Water
Influences Beyond the Water Source
Even if source water contains tannins, household plumbing materials and their condition can affect how tannins appear in your tap water. Older or corroded piping may change water color or interact with organics, possibly intensifying tea-colored staining.
Why Testing Matters for Your Household
Your home’s plumbing, storage tanks, and filters can alter the presence or visibility of tannins. Only a direct laboratory test on water collected from your tap provides an accurate measure of tannins in your household water.
5. A Worked Example: Reading the Record's Median and Range as a Homeowner Would
Applying EPA Data for Decision Support
For parameters like lead, the record reports a 90th percentile concentration of 0.002 mg/L from distribution samples, a measurement reflecting plumbing influences rather than source water. No tannin data exists, so this example shows how you might interpret other constituents but must find separate means to assess tannins.
Using This Approach for Tannins
Since no system-wide tannin data is available, homeowners need to arrange for certified laboratory testing focused on tannins to understand their water condition.
6. What Questions a Commercial or Industrial Operator Adds That a Household Does Not
Additional Concerns for Larger or Specialized Users
Commercial or industrial water users consider tannin impacts on equipment, processes, and product quality. They often require detailed monitoring and treatment plans based on specific operational needs.
For Residential Use, Focus on Household Testing
Households primarily need to know if visual or taste changes are due to tannins and how to address them, which differs from commercial priorities.
Summary
The EPA record for NJ American Water - Raritan in Union County does not include tannin testing, meaning no regional data confirms tannin levels in the public water supply. Your best course to know whether tannins affect your household water is to conduct a certified laboratory test specific to tannins.
If your water shows signs of tannins, the C-Series Yellow, Tea-Colored Tannin Water Filter ships ready to configure and is documented to reduce tannins effectively, improving water clarity and color without relying on system-wide data.
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 NJ AMERICAN WATER - RARITAN (NJ2004002), surface water supply, serving 615430 people: 0 health-based violations of 3 total; lead 90th percentile 0.002 mg/L