Myth: Untreated nitrate in well water quickly leads to severe health problems
Nitrate can be a health concern at high concentrations, particularly for infants, but the available data for Bexar County shows no results exceeding federal safety thresholds. Long-term exposure risks are linked to levels above those limits, which are not observed in these samples. Without specific testing of your well water, it’s inappropriate to assume untreated nitrate is at harmful levels in your household supply.
Myth: Sample depth and well depth don’t affect nitrate results significantly
The USGS gathered 636 nitrate results from wells between 180 and 2326 feet deep within the region. Deeper wells may have different water characteristics than shallow ones. Lower nitrate detections in this dataset often come from a range of depths. This means your well’s depth matters: deeper wells often show lower nitrate but exact levels in your well can only be determined by individual testing.
Myth: You can decide on treatment options without detailed water data
Before considering any treatment system, record the following information about your water source and household demand:
- Well depth and type
- Recent water quality test results for nitrate and nitrite
- Daily water usage patterns, including peak demand
- Any prior treatment or filtration methods currently in use
This information helps clarify the appropriate capacity and technology needed to address nitrate, avoiding both undersizing and overspending.
Myth: Aesthetic secondary standards are the same as health-based limits for nitrate
Federal guidance distinguishes between secondary standards affecting taste, staining, or corrosion and primary health-based standards. For nitrate and nitrite, federal thresholds focus on health risk limits rather than aesthetic qualities. The Bexar County samples showed nitrate well below those health-based thresholds, indicating that aesthetic factors like odor or color are unrelated to nitrate presence here.
Myth: Treatment capacity should be guessed based on typical household size alone
When selecting a nitrate treatment system, household water use volume and peak flow demand must guide capacity decisions, not just the number of residents. Treatments designed for average flow rates might not adequately handle high-use situations like multiple simultaneous showers or irrigation. Knowing your daily water usage in gallons helps determine how large a system to select to maintain effective nitrate removal.
For households assessing treatment, the Pentair Nitrate & Nitrite (Well) Filter system ships ready to configure and is designed specifically to reduce nitrate and nitrite in private well water. It’s important to confirm your water’s specific nitrate levels before choosing a treatment to ensure the system matches your needs.
What You Should Not Conclude from Regional Nitrate Data
While this USGS groundwater data provides a comprehensive nitrate overview for Bexar County aquifer 218EDRDA, the absence of any sample above federal thresholds does not guarantee your well water has the same quality. Your individual well’s nitrate concentration can be higher or lower depending on local conditions and human activity near your property. Only direct testing of your water supply reveals your exact nitrate levels and informs the best treatment choice.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2026-06-02. These figures describe groundwater sampled in this area. They are not a test of any individual private well - only a test of that well can establish its own water.
On record: U.S. Geological Survey sampling of Nitrite in the 218EDRDA aquifer (Bexar County): 636 results from 53 wells, median 0.004 mg/L, range 0.001-0.084 mg/L; none above any federal threshold
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