Ct Laboratories, LLC

At a glance

What it is certified to test

1 of the 9 common well tests on the WI list (see which)

Price

no per-test price printed on the lab’s website when we read it (15 Nov 2026): ask for a quote

Turnaround

not stated on the state list or the lab’s website: ask when you order

Homeowner samples

yes (lab’s own website, read 15 Nov 2026)

Lab facts

Listed by

Wisconsin (Wisconsin DNR / DATCP (microbiology))

Address

1230 Lange Crt, Baraboo, WI 53913 · Open in Google Maps

Phone

(608) 356-2760

Website

www.ctlaboratories.com

Not on the state list: found and checked by us, 15 Nov 2026

Public / homeowner samples

Homeowner samples: yes (lab’s website)

WI DNR bacti lab list (includes utility/wastewater labs); homeowner acceptance not stated

Certification record

Certificate ID

289 ; 157066030

Issued by

Wisconsin DNR / DATCP (microbiology) (certification program)

List version

Wisconsin DNR - Drinking Water (SDWA) Labs Certified for Coliform Bacteria Testing, version live page

We fetched it

15 Nov 2026 (file SHA-256 db1a5cb9cb67…) · open the state file

Tests on the state list

• Named on the official list The state list names this analyte (or a column for it) for this lab.
• Group-level certification Certified for a parent group (e.g. 'Inorganics') that includes this analyte. Confirm the specific test with the lab.
• Partial group certification The list marks the group as 'Partial'. Confirm this analyte with the lab.
• Subcontracted The lab sends this analyte to another accredited lab (MDH 'X*').

Homeowner service and turnaround (lab’s own website)

• Takes homeowner samples: yes. The lab’s site says: “Whether you're an individual home owner, a plumber, or contractor, she can guide you to determine what testing would suit your needs the best.” source
• Prices: no price printed on the lab’s website when we read it on 15 Nov 2026: ask for a quote.

From the lab’s own website, read 15 Nov 2026 and re-read by a second checker; next check due by 13 Feb 2027. Certification fields come from the state list only.

Nearest labs that take homeowner samples

No other lab that takes homeowner samples is within 25 miles of this lab; the nearest is 37 miles away. Distances are straight-line from the address on the state list (approx. = ZIP-code centre). “Takes homeowner samples” comes from a state list column or the lab’s own website, as named.

Price and turnaround as printed on each lab’s own website and checked by a second reader; – = not published or not read yet.

Around this lab: Sauk County, WI

• Private wells: about 22,980 people, 36% of Sauk County’s 63,642 residents (USGS, 2015); rank 29 of 72 counties in Wisconsin by people on wells.

• EPA radon zone (indoor air): Zone 2: moderate potential (average indoor radon may be between 2 and 4 pCi/L). EPA says the zone map should not decide whether one home needs testing.
• Arsenic above 10 µg/L (USGS model): about 563 private-well users (95% range 456 to 702; 2010 base), rank 46 of 72 in the state. A screening estimate, not a measurement of any well.
• Older homes (Census ACS 2020–2024): 47% of 31,496 housing units were built before 1980, below the state share of 57%. Homes built before 1986 are more likely to have lead solder or fittings, so test tap water for lead there.
• PFAS in public water nearby (public supply, not your well): 4 public systems serving this county reported EPA UCMR 5 results; 0 had a PFOA or PFOS sample at or above 4.0 ng/L.

County figures describe where the lab is, not the lab. Sources: USGS 2015 water use and 2017 arsenic estimates, EPA radon zones, Census ACS table B25034 (2020–2024), EPA UCMR 5 (2023–2026); details and links on the sources page.

Before you send a sample

Call the lab to confirm it's currently certified for the exact test and method, that it accepts samples from homeowners, and how to collect and ship them. Bacteria samples have short holding times. Status can change between list updates. To check a status, contact the Wisconsin certification program.

Is this your lab?

Labs can ask for corrections through the agency that publishes their state list. Homeowner service, prices and turnaround above come only from the lab’s own website. To ask us to correct or remove this listing, write to us (how we handle listings).