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Home Β· Blog Β· Wells
WellsApril 2, 2026Β·10 min read

Private Well Water Testing 101: What to Order and How Often

Wells are not covered by EPA drinking water rules the same way city water is. Here is a sensible testing schedule, which labs to use, and what results mean for treatment.

JL
By J. Letorney Β· Water treatment specialist Β· 40+ years in the field
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If you drink from a private well, you are your own water utility. There is no annual CCR in the mailbox β€” safety depends on regular testing and maintaining pumps, casings, and any treatment equipment.

Important: Total dissolved solids (TDS) pens and strip tests cannot prove your water is safe. They are hints, not substitutes for a certified lab panel appropriate to your region and risks.

Baseline tests (most wells)

A common starting panel includes bacteria (coliform / E. coli), nitrates, pH, conductivity/TDS, and common ions (hardness, iron, manganese, sulfate, chloride). Your state health department often publishes minimum recommendations.

Regional hazards to ask about

Depending on geology and nearby land use, labs may add arsenic, uranium, radon in water, volatile organic compounds (VOCs), or PFAS. A local environmental lab can recommend add-ons based on ZIP code and aquifer type.

How often

  • Bacteria: annually, and after flooding, well work, or any change in taste/odor.
  • Nitrate: at least annually if infants or pregnancy are in the home; many states recommend yearly testing.
  • Arsenic / metals: every few years unless you are near known hotspots or treatment changes β€” follow local guidance.

Sampling matters

Use the lab's chain-of-custody instructions: first-draw vs. flushed samples tell different stories for metals. For bacteria, follow sterile bottle procedures and sample timing exactly.

Treatment: do not guess

Pick treatment based on documented results. For example, nitrates often require RO or distillation; bacteria usually points to disinfection/UV and fixing the source of contamination; acidic pH may need neutralization β€” but the right fix depends on the full chemistry.

City water vs. well: WaterCheckup focuses on public water systems. For wells, start with your county extension or state environmental health office for vetted lab lists and local hazard maps.
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