BH
Baileys Harbor Wastewater Treatment Facility
2605 Summit Rd, Baileys Harbor, WI
Public water system lab. Many don't accept private well samples, so call first.
Water testing labs in Door County, WI
3 state-accredited water testing labs in Door County, WI.
3 certified labsUpdated October 2026Source: state lab accreditation records
Source: Wisconsin DNR list of labs certified for coliform bacteria testing, list dated Oct 28, 2026. Find a Water Test is independent and not affiliated with the Wisconsin Department of Natural Resources. Certification covers specific tests, so confirm the lab is certified for the ones you need: Verify a certification.
3 certified labs near Door County, WI
EW
Ephraim Wastewater Plant
10285 Town Line Dr, Ephraim, WI
Public water system lab. Many don't accept private well samples, so call first.
VS
Village of Sister Bay
2124 Autumn Court, Sister Bay, WI
Public water system lab. Many don't accept private well samples, so call first.
Mail-in labs that ship to Door County, WI
How mail-in testing worksNT
National Testing Laboratories (WaterCheck)
Ships nationwide
Single tests from $75; well and city packages $165 to $440
Certified in Wisconsin
TS
Tap Score by SimpleLab
Ships nationwide
Single-contaminant kits from about $145; full well and city panels about $300 to $870
Testing service: sends your sample to a partner lab.
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Well water guides
Common questions
Where can I test well water near Door County, WI?
The state-accredited labs above serve Door County, WI. Many offer sample bottles you collect at home.
What should I test for near Door County, WI?
Start with total coliform bacteria and nitrates, then ask your county health department about local concerns.