Water Testing

Water testing is the process of analyzing a water sample for contaminants, minerals, and other characteristics that affect safety and quality. Municipal water customers receive annual Consumer Confidence Reports (CCR) from their utility. Private well owners have no such oversight — they are solely responsible for testing and treating their own water supply, and the EPA strongly recommends annual testing for at least basic parameters.

What to test for

Minimum annual tests for well water: coliform bacteria (E. coli), pH, nitrates (especially if children under 6 are in the home), and total dissolved solids (TDS). Beyond these basics, test for additional parameters based on local geology and land use:

• Hard water areas: hardness, iron, manganese
• Agricultural areas: nitrates, pesticides, herbicides
• Near industrial sites: heavy metals (lead, arsenic, chromium), VOCs
• Radon zones (Northeast, Midwest): radon in water
• Older homes: lead (from lead service lines or lead solder in pre-1986 plumbing)

Testing methods

• Certified lab test: the gold standard. Collect samples in lab-provided containers following specific protocols. Mail to an EPA-certified lab. Results in 5–10 business days. Cost: $30–$200 depending on the panel.
• At-home test kits: fast (results in minutes) but limited accuracy. Good for basic screening (pH, hardness, nitrates, bacteria) but not for legal compliance or detailed contaminant identification.
• State health department testing: many state programs offer free or low-cost basic water testing for private well owners.

Acting on results

Bacterial contamination requires shock chlorination of the well and retesting. High hardness calls for a water softener. Lead requires either replacing lead service lines and fixtures or installing a certified NSF 53 filter. Arsenic requires a reverse osmosis system or an NSF 58-certified filter. Never rely on a water treatment dealer's in-home "free water test" for unbiased analysis — use an independent certified lab.