Wisconsin Private Wells: Testing Schedule from the DNR

Wisconsin Private Wells: Testing Schedule from the DNR

The Wisconsin DNR recommends regular testing of private well water. Its page says:

What and how often

• Bacteria: once a year, and whenever taste, colour or smell changes.
• Nitrate: once a year, and before the well is used by a woman who is or may become pregnant.
• Arsenic: most users every five years; yearly in Outagamie, Winnebago or Brown counties or if a prior sample showed arsenic.

Thresholds named

• Nitrate is elevated above 10 ppm (mg/L). If elevated, avoid it if pregnant and do not give it to infants under six months or use it for formula.
• Arsenic is elevated above 10 ppb (ug/L).
• If a lab finds bacteria, stop drinking the water.

Sampling

Use a certified lab for each contaminant; the lab supplies a sampling kit. The page says samples must reach the lab within 48 hours, and improper collection often causes false positives.

After the result

Choose a filter or a new well only after you know the contaminant. Our filter cartridge article explains certification claims. Not verified: Wisconsin pump-installer licensing and well-construction rules.

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General information only. Not electrical, plumbing, legal or code advice. Confirm details with a licensed professional and your local authority.