WO
Washington Ozaukee Public Health Department
121 W Main St, Port Washington, WI
Water testing labs in Ozaukee County, WI
6 state-accredited water testing labs in Ozaukee County, WI.
6 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.
6 certified labs near Ozaukee County, WI
WO
Washington Ozaukee Public Health Department
333 E Washington St West Bend, Port Washington, WI
WD
Water Diagnostics Laboratories, LLC
8605 W Freistadt Rd, Mequon, WI
GW
Grafton Water Utility
1860 9th Ave, Grafton, WI
Public water system lab. Many don't accept private well samples, so call first.
PW
Port Washington Water Dept
408 N Lake St, Port Washington, WI
Public water system lab. Many don't accept private well samples, so call first.
VF
Village of Fredonia
210 Park Rd, Fredonia, WI
Public water system lab. Many don't accept private well samples, so call first.
Mail-in labs that ship to Ozaukee 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.
Bad result? Get help from water treatment pros near Ozaukee County, WI
Tell us what your test found and we'll connect you with up to three local water treatment companies.
What happens next
- We match your ZIP to water treatment companies nearby.
- They contact you directly to talk through your results.
- Compare options and pick one, or none. No fee, no obligation.
Free, no obligation. We don't sell your details to anyone else.
Just need a lab? Every certified lab is listed above with directions.
Run one of these businesses? Claim your listing, add a missing one or get featured in Ozaukee County, WI.
Well water guides
Common questions
Where can I test well water near Ozaukee County, WI?
The state-accredited labs above serve Ozaukee County, WI. Many offer sample bottles you collect at home.
What should I test for near Ozaukee County, WI?
Start with total coliform bacteria and nitrates, then ask your county health department about local concerns.