Fillmore SWCD Water Quality Laboratory

At a glance

What it is certified to test

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

Price

not published on the state list: ask the lab for a quote

Turnaround

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

Homeowner samples

yes (Minnesota list)

Lab facts

Listed by

Minnesota (Minnesota Department of Health - MNELAP / Well Management)

Address

900 Washington Street NW, Preston, MN 55965 · Open in Google Maps

County

Fillmore

Phone

(507) 765-3878

Certificate

The MDH Accredited Labs in Minnesota Accepting Drinking Water Samples from Private Well Users (version October 2026) prints no certificate ID or expiry date for this lab.

Public / homeowner samples

Public samples: yes (per state)

Listed on MDH 'Accredited Labs Accepting Drinking Water Samples from Private Well Users'

Left blank on the list

The Minnesota list (version October 2026) gives no website for this lab.

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*').

Nearest labs that take homeowner samples

No other lab that takes homeowner samples is within 25 miles of this lab; the nearest is 29 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: Fillmore County, MN

• Private wells: about 8,994 people, 43% of Fillmore County’s 20,834 residents (USGS, 2015); rank 41 of 87 counties in Minnesota by people on wells.
• At house sale: Fillmore County has a septic system rule (Fillmore County Subsurface Sewage Treatment System Ordinance, Section 803 (Sale or Transfer of Real Estate)). What it requires

• EPA radon zone (indoor air): Zone 1: highest potential (average indoor radon may be greater than 4 pCi/L). EPA says the zone map should not decide whether one home needs testing.
• Arsenic above 10 µg/L (USGS model): about 202 private-well users (95% range 164 to 249; 2010 base), rank 68 of 87 in the state. A screening estimate, not a measurement of any well.
• Older homes (Census ACS 2020–2024): 63% of 9,692 housing units were built before 1980, above the state share of 52%. 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): 1 public system 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 Minnesota 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).