Rural Home Compass

Michigan homeowner guide · Private well water

When should you test a private well in Michigan?

Michigan uses different evidence for construction approval, routine ownership, a property purchase, and an event such as flooding. A new or repaired well has an initial coliform requirement before service, while MDHHS publishes a separate recurring schedule and local health departments can add tests for local geology, household vulnerability, or nearby contamination.

Evidence reviewed 2026-09-16Rural Home Compass editorial desk19 official sources
Homeowner organizing a sealed well-water sample kit, records, and calendar beside a rural window
Use the calendar only after identifying the decision: new-well work, a purchase baseline, routine care, and post-event testing do not have the same purpose.
What this testing guide covers

Michigan’s distinct testing path combines a required initial coliform result for new and repaired wells, MDHHS annual and multi-year homeowner cadences, at-least-once PFAS guidance, certified laboratory sampling units, and a split record search between Wellogic-era and older scanned well records.

From question to result

How to get your well water tested in Michigan

Use this path to turn a reason for testing into a laboratory report you can act on. The legal status and test list depend on whether the sample is for routine care, a purchase, regulated well work, or a contamination event.

  1. Decide why you are testing

    Choose the matching path first: routine care, buying a home, a new or repaired well, or flooding, repair, or another contamination concern. The purpose determines whether the result is homeowner guidance, purchase evidence, or part of a regulated process.

    Official guidanceHow to Get Your Drinking Water TestedCare for Mi Drinking Water: TestYour New Water Well

  2. Choose the tests for that decision

    Use the MDHHS recurring schedule as homeowner guidance, then ask the local health department whether geology, nearby land use, plumbing, a vulnerable household member, or a known investigation calls for arsenic, lead, PFAS, or another named analysis. Do not treat the recommended schedule as one universal legal panel.

    Official guidanceCare for Mi Drinking Water: TestResources for Private Residential Well OwnersPFAS in Drinking Water and Private-Well Investigation Guidance

  3. Confirm the certified laboratory

    Contact the local health department or a Michigan-certified drinking-water laboratory before sampling. Confirm that the laboratory accepts private-well samples and is certified for each analyte you need, then obtain its containers and written instructions.

    Official guidancePrivate Residential Water Well TestingDrinking Water Laboratory Certification ProgramObtaining Necessary Drinking-Water Sampling Units

  4. Collect and submit the sample correctly

    Follow the laboratory’s directions for the collection point, flushing, container, preservation, temperature, paperwork, and delivery time. Special analyses such as PFAS use their own precautions; do not apply an ordinary chemistry-sample method to them.

    Official guidanceLaboratories Offering PFAS Home TestingObtaining Necessary Drinking-Water Sampling UnitsDrinking Water Sampling and Testing FAQ

  5. Read the report and choose the next step

    Keep the complete report, including analytes, units, sample location, and date. A routine result returns to the appropriate testing schedule; an elevated, unexpected, or event-related result should be discussed with the laboratory and local health department before selecting treatment or declaring the issue resolved.

    Official guidanceHow to Get Your Drinking Water TestedCare for Mi Drinking Water: Test

Testing is not a full well inspection. Water-quality testing measures the submitted sample. It is not a full well-system inspection of the casing, cap, pump, pressure, yield, wiring, or physical condition; a property purchase may need both services.

Four different decisions

Start with why you are testing.

01State requirement

New or repaired well

Complete the initial coliform step before the well enters service.

Michigan’s well guidance states that an initial coliform-bacteria sample must be collected before a new or repaired well is placed into service. The well construction code also requires disinfection of new, repaired, or reconditioned wells; a local health department may apply a more protective local sanitary code or add analyses for the site.

  • Confirm the permit, disinfection, sample collector, laboratory, and local acceptance process with the local health department before using the well for drinking.
  • Keep the well and pump record, permit, construction invoice, equipment records, and complete laboratory report together.

Official guidanceYour New Water WellState of Michigan Water Well ManualConsumer Guide to Hiring a Well Contractor

02Purchase-planning use

Buying a home

Use disclosure and records to define what a current test must answer.

Michigan’s statutory seller disclosure form asks whether well water has been tested and, if so, for the date and results; that disclosure is not itself a new statewide water-test mandate for every transfer. EGLE lists buying or selling a home as a reason to test, while a contract, lender, local health department, or site condition may set a more specific scope.

  • Request the seller disclosure, past laboratory reports, Wellogic or scanned construction record, permit file, repair history, and treatment maintenance records.
  • Confirm contract, lender, and local requirements, then obtain a current certified-laboratory baseline when the available evidence does not answer the household’s intended use.

Official guidanceHow to Get Your Drinking Water TestedMichigan Seller Disclosure Act and StatementWellogic FAQ and Record Coverage

03State recommendation

Routine care

Use the MDHHS schedule, then add local and property-specific concerns.

MDHHS recommends annual coliform bacteria and E. coli, nitrate, and nitrite testing; arsenic and lead every three to five years; and PFAS at least once. These are state health recommendations for private residential well owners, not a recurring legal monitoring schedule equivalent to the rules for a public water supply.

  • Keep results by analyte and sample location so changes can be compared over time instead of recording only that the well was “tested.”
  • Ask the local health department whether regional groundwater, nearby land use, household vulnerability, treatment, or past detections change the schedule.

Official guidanceCare for Mi Drinking Water: TestResources for Private Residential Well Owners

04State recommendation

Flood or water-quality event

Treat flooding or a water change as a new sampling decision.

Michigan identifies flooding near the well, well repairs, and a change in taste, color, or smell as reasons to reconsider testing. After floodwater reaches a well, state emergency guidance calls for flushing and disinfection appropriate to the well type and a certified-laboratory coliform sample after chlorine has been flushed; repair-related service requirements still apply separately.

  • Use a safe alternate drinking-water source and contact the local health department or a registered well contractor before disinfecting, sampling, or returning a flooded system to use.
  • Tell the laboratory exactly what happened and when; do not substitute an older routine result for a post-event sample.

Official guidanceCare for Mi Drinking Water: TestYour New Water WellProtecting Your Private Water Supply in an Emergency

New wells and regulated work

The required starting tests depend on the work.

Michigan requires an initial coliform sample before a new or repaired well is placed into service. Local sanitary codes and property conditions can require or justify additional analyses, so this one-item statewide starting panel is not a universal certificate of water safety.

  • Coliform bacteria

The responsible professional and certified laboratory determine the accepted sample and report. Do not assume a retail package satisfies a regulatory purpose.

Official basis for the new-well panelYour New Water WellState of Michigan Water Well ManualConsumer Guide to Hiring a Well Contractor

Existing wells

Michigan separates the construction requirement from the homeowner testing schedule.

CadenceEvery three to five years
Starting testsArsenic · Lead

MDHHS publishes this recurring interval; a prior detection, treatment system, plumbing concern, or local groundwater condition can justify a different follow-up plan.

Official guidanceCare for Mi Drinking Water: TestArsenic in Well Water

The calendar is not the whole answer

When should the panel change?

Pregnancy, an infant, or a young child in the household

MDHHS lists these household circumstances as reasons to consider testing beyond a stale routine result; ask the local health department which analytes and timing fit the household.

Official guidanceCare for Mi Drinking Water: Test

A current Care for MiWell project recruitment letter

The current MDHHS sampling project is invitation-based for selected private-well households. Confirm current eligibility from the official project page rather than treating it as a statewide on-demand testing benefit.

Official guidanceCare for Mi Drinking Water Projects

Nearby industrial activity, a spill, storage tanks, waste sites, or another credible contamination source

Use the Water Well Viewer and agency or local-health information to frame a contaminant-specific conversation; mapped proximity does not prove that a private well is contaminated.

Official guidanceHow to Get Your Drinking Water TestedWater Well Viewer

Local geology or a prior arsenic detection

Michigan has areas with naturally higher groundwater arsenic. Use a laboratory result and local-health guidance rather than treating the regional risk as a statewide detection or choosing treatment from a map alone.

Official guidanceHow to Get Your Drinking Water TestedArsenic in Well Water

Laboratory and sampling

Confirm the route before collecting water.

  1. Contact the local health department or a Michigan-certified drinking-water laboratory and confirm that the laboratory accepts private residential samples and is certified for the specific analytes requested.

    Official guidanceCare for Mi Drinking Water: TestDrinking Water Laboratory Certification Program

  2. Obtain the exact laboratory sampling unit before collection. EGLE warns that a sample submitted in the wrong container may not be analyzed because container, preservation, and interference requirements differ by test.

    Official guidanceObtaining Necessary Drinking-Water Sampling UnitsDrinking Water Sampling and Testing FAQ

  3. Follow the laboratory’s collection point, flushing, preservation, temperature, delivery-time, and form instructions. PFAS sampling uses separate precautions and a method-capable laboratory; do not reuse an ordinary chemistry bottle or procedure.

    Official guidancePrivate Residential Water Well TestingLaboratories Offering PFAS Home Testing

Official records

Search the mapped record, then check the older archive and local file.

Record holder

Michigan EGLE maintains Wellogic and the Water Well Viewer; the local health department may hold permits, local approvals, sample results, or records absent from the state systems.

Wellogic primarily covers records from 2000 forward; wells installed in 1999 or earlier may be in the scanned county/township archive, and some local records may not appear in the state database. Viewer locations come from address matching, GPS, or legal descriptions and can be inaccurate, so an empty or misplaced map result is not proof that no well or record exists.

Open Michigan EGLE Water Well Viewer

Records and lookup guidanceWater Well ViewerWellogicWellogic FAQ and Record Coverage

Look for
  • Water well and pump record
  • Local permit and approval file
  • Initial and later laboratory reports
  • Repair, reconditioning, plugging, and treatment records

Turn the schedule into questions

Build a starting water-test panel.

The recommender combines your current issue, purchase status, flood or repair history, nearby agriculture, vulnerable occupants, and ZIP-based Michigan context. It does not replace the responsible professional or laboratory.

Open the Well Water Test Recommender →

Official sources

These sources were reviewed for this page on 2026-09-16. A build date does not refresh that review.

  1. Michigan EGLE: How to Get Your Drinking Water TestedReviewed 2026-09-16
  2. Michigan EGLE: Private Residential Water Well TestingReviewed 2026-09-16 · Recheck every 90 days
  3. Michigan Department of Health and Human Services: Care for Mi Drinking Water: TestReviewed 2026-09-16 · Official source updated 2026-09-03 · Recheck every 90 days
  4. Michigan EGLE and MDHHS: Resources for Private Residential Well OwnersReviewed 2026-09-16 · Recheck every 90 days
  5. Michigan EGLE: Your New Water WellReviewed 2026-09-16
  6. Michigan EGLE: State of Michigan Water Well ManualReviewed 2026-09-16
  7. Michigan EGLE: Consumer Guide to Hiring a Well ContractorReviewed 2026-09-16 · Recheck every 90 days
  8. Michigan Legislature: Michigan Seller Disclosure Act and StatementReviewed 2026-09-16
  9. Michigan EGLE: Arsenic in Well WaterReviewed 2026-09-16
  10. Michigan PFAS Action Response Team: PFAS in Drinking Water and Private-Well Investigation GuidanceReviewed 2026-09-16 · Recheck every 30 days
  11. Michigan PFAS Action Response Team: Laboratories Offering PFAS Home TestingReviewed 2026-09-16 · Recheck every 90 days
  12. Michigan Department of Health and Human Services: Care for Mi Drinking Water ProjectsReviewed 2026-09-16 · Official source updated 2026-09-03 · Recheck every 30 days
  13. Michigan EGLE: Drinking Water Laboratory Certification ProgramReviewed 2026-09-16 · Recheck every 90 days
  14. Michigan EGLE: Obtaining Necessary Drinking-Water Sampling UnitsReviewed 2026-09-16 · Recheck every 90 days
  15. Michigan EGLE: Drinking Water Sampling and Testing FAQReviewed 2026-09-16 · Recheck every 90 days
  16. Michigan EGLE: Protecting Your Private Water Supply in an EmergencyReviewed 2026-09-16
  17. Michigan EGLE: Water Well ViewerReviewed 2026-09-16 · Recheck every 90 days
  18. Michigan EGLE: WellogicReviewed 2026-09-16 · Recheck every 90 days
  19. Michigan EGLE: Wellogic FAQ and Record CoverageReviewed 2026-09-16 · Recheck every 90 days