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Sampling instructions

Sampling instructions

Lead and copper compliance samples must be collected according to very specific instructions. Water supplies may use the following instructions to inform operators and/or homeowners on proper water sample collection.

  • Download investigative sampling guidance

    Michigan water supplies may collect investigative samples to follow up on high lead or copper sample results. Investigative samples are a tool to locate potential sources of lead and copper in a home or building’s fixtures, plumbing, or service line. Water supplies may use this guidance document to conduct investigative sampling.

  • Water flowing out of a faucet tap.

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    Michigan water supplies must sample for lead and copper using a risk-based tiering criteria. This requires maintaining a site sampling plan that meets the sampling requirements.